www.legris.com

Couplings to DIN 2353/ISO 8434-1/4

specifications and installation

1

General technical information page

Conformity to standards and certifications 2

Materials 3

Pressures 4

Temperatures 5

Threaded fittings, tapped holes 6 to 9

O-rings 10

Tightening torques 12 to 13

Tube selection 14 to 15

Couplings to DIN 2353 / ISO 8434-1/4: installation

Cutting rings 16 to 17

Tube preparation 18

Installation 19 to 26

Tube installation 27

Part numbers 28

Contents

2

General technical informationConformity to standards Tube sidelCouplings with cutting rings are manufactured in accordance with DIN 2353 (ISO8434-1). Technical characteristics for product packaging conform to DIN 3859 standard. Special models also conform to these standards.

lCone sealing couplings are fitted with a sealing cone to DIN 3865 form B on the studside. Fitting bodies are standardised as per DIN 3942 to DIN 3946/ISO 8434-4.

lWeld nipples (ISO 8434-4) are fitted with a probe and nut which conform to DIN2353/ISO 8434-1 standards. The cutting ring is replaced by a weld nipple to DIN 3865form A/ISO 8434-4 with O-ring.

lFlare couplings are designed for tube dimensions which conform to ISO 8434-2 standard. They are designed for 37° flare couplings.

lAdaptors DIN 2353/ 37° flare tube: to DIN 2949 standard.

Thread side lBSP parallel thread, for tapped hole according to ISO 1179-1 / DIN 3852-2 (form X) normlMetric parallel thread, for tapped hole according to ISO 9974-1 / DIN 3852-1 (form X) normlUN/UNF thread, for tapped hole, according to ISO 11926-1 / ANSI/ASME B1.1-1989 normlMetric thread with O-ring seal, for tapped hole, according to ISO 6149-1 normlNPT thread, for tapped hole, according to ANSI/ASME B1.20.1-1983 normlBSP taper thread, for tapped hole, according to DIN 3852-2 (form Z) normlMetric taper thread, for tapped hole, according to DIN 3852-1 (form Z) normOur couplings always conform to current standards and are continuously being optimised. Therefore we reserve the right to change construction.

CertificationsOur couplings are approved by a number of qualified certification bodies (copies of certificates are available upon request).

lGermanischer Lloyd (GL)DIN 2353/ISO 8434-1 cutting ring couplings, series L and S, are approved to be used inhydraulic circuits up to 42 mm. N° 47 049 – 03 HH certification.

lDet Norske Veritas (DNV)DIN 2353/ISO 8434-1 cutting ring couplings, series L and S, are approved to be used inhydraulic circuits up to 42 mm. N° P-11474 certification.

lChina Classification Society (CCS)DIN 2353/ISO 8434-1 cutting ring couplings, series L and S, are approved to be used inhydraulic circuits up to 42 mm. N° HBT03170140 certification.

lDVGW: n° DG – 4502AS0205

3

General technical informationMaterialslOur couplings are manufactured from drawn or forged steel according to DIN 3859-1norm. Upon request, they are also available in brass and in high temperature or acidresistant steel (materials to DIN 3859).

lWeld nipples are made of smelted weld steel – material C15, St 37-2, according to DIN 3859-1 norm.

lO-rings and soft seals are supplied in NBR, as standard; on request they are also available in FPM.

Surface treatmentlThe surface finish of bodies and nuts is zinc-coated and yellow bi-chromated (A3C to ISO 4042).

lCutting rings are zinc-coated blue chromated as standard (A3K to ISO 4042); Double-bite rings are zinc-coated and olive chromated (A3M to ISO 4042).

lDiNova rings are protected by surface treatments exempt from chromium 6, respectingthe requirements of the automotive industry and European directives that require theelimination of chromium 6. This guarantees 400- hour resistance to the formation of red rust.

lWeld nipples are phosphated and oiled. Bodies and nuts are, as standard, zinc-coatedand yellow chromated (A3C to ISO 4042). On request, the surface finish of bodies andnuts are available in zinc-coated and blue chromated (A3K to ISO 4042) or phosphatedand lubricated. Zinc-coated couplings have a clear lubricant which reduces friction andavoids the need to additionally oil the couplings’ components.

O-rings and soft seals are supplied in NBR, as standard; on request they are alsoavailable in FPM.

Corrosion resistancyOur couplings have been salt spray tested according to DIN 50 021 SS norm. The A3Cand A3M surface treatments guarantee 200-hour resistance to the formation of whiterust and 400-hour resistance to red rust.

Materials compatibilityCoupling and seal materials should be selected according to the fluids to be conveyed,specific environments and operating temperatures. The following table indicates thecompatibility of metals and elastomers with fluids to be conveyed for standard products.

4

Bar

Series o.d. tube

Nominal pressures for Legris couplings fitted with double-bite cutting rings and DiNovarings. Threaded plugs with captive flat O-ring seal (Form E DIN 3852).

Nominal pressures for couplings with cutting ringsaccording to DIN 2353/ISO 8434

General technical informationPressuresThe pressure levels given in this catalogue are those for steel couplings that have beeninstalled correctly. Nominal pressures (PN) represent the acceptable working pressures, with a safety factorof 4, a constant load and temperatures from –20° to +120°C, according to ISO 8434-1 and ISO 8434-2.Working pressures (PB) represent maximum acceptable pressures, with a safety factor of2,5, a constant load and temperatures from –20° to +120°C, according to DIN 2401. When higher temperatures and mechanical vibrations are involved, the working pressures should be reduced accordingly.

5

Safety factorWhen using coupling combinations, the lowest pressure should always be taken. It maybe necessary to reduce pressure for threaded stud couplings when the lock nut is notmade of steel.The figures also assume that our mounting instructions have been followed, stud couplings tightened with the prescribed torque and the fitting holes tapped according tothe DIN 3852 norm.Pipe work must be installed in a manner to ensure that couplings are not subject to additional stress or vibration.

TemperaturesAcceptable working temperaturesDependant on constituent materials: lCouplings:- Steel (DIN 3859): - 40° to + 200°C (PN and PB are given for a temperature range from –

20° to + 120°C. When higher temperatures and mechanical vibrations are involved, theworking pressures should be reduced accordingly).

lSeals:- NBR: - 25° to + 100°C. - FPM: - 15° to + 200°C. - PTFE: - 100° to + 250°C.

When combining several different types of materials, the highest minimum and thelowest maximum temperature figures should be used.

Ambient temperatures: Down to – 35°C with NBR seals, down to – 25° with FPM seals.

Storage conditionsCouplings with elastomer seals should be stored according to the DIN 7716 norm.Components should be stored cold –at a maximum temperature of 25°C-, dry and dustfree.They should be protected against direct sunlight, intense artificial light and ozone.

General technical information

6

C h14d3

mind4* d4**

-0,2d5

-0,1d6 d7 min

b1maxa1

M8x1 12 13 8 1M10x1 14 15 16,5 13,9 14,9 15,5 8 1M12x1,5 17 18 20 16,9 17,9 18,5 12 1,5M14x1,5 19 20 21,5 18,9 19,9 20 12 1,5M16x1,5 21 23 24,5 21,9 22,9 23 12 1,5M18x1,5 23 25 27,5 23,9 24,9 26 12 2M20x1,5 25 27 30 25,9 28 14 2M22x1,5 27 28 31,5 26,9 27,9 29 14 2,5M26x1,5 31 33 36,5 31,9 35 16 2,5M27x2 32 33 37,5 31,9 32,9 36 16 2,5M33x2 39 41 45 39,9 40,9 43 18 2,5M42x2 49 51 55 49,9 50,9 53 20 2,5M48x2 55 56 62,5 54,9 55,9 59 22 2,5

C h14d3

mind4* d4**

-0,2d5

-0,1d6 d7 min

b1maxa1

G1/8 14 15 17 13,9 14,9 16 8 1G1/4 18 20 21,5 18,9 19,9 21 12 1,5G3/8 22 23 25,5 21,9 22,9 24 12 2G1/2 26 28 30 26,9 27,9 28,5 14 2,5G3/4 32 33 37 31,9 32,9 35 16 2,5G1 39 41 46 39,9 40,9 45,5 18 2,5G1 1/4 49 51 57 49,9 50,9 52,5 20 2,5G1 1/2 55 56 63,5 54,9 55,9 58,5 22 2,5

Threaded fittingsBSP threads:ISO 1179-2 orDIN 3852-11 form ESealing by washerMetric threads:ISO 9974-2 orDIN 3852-11 form ESealing by washer

Threaded fittingsBSP threads:ISO 1179-3Sealing by O-ringMetric threads:ISO 261/ DIN 13(thread)Sealing by O-ring

For couplings with lock nuts to

Tapped holesFor BSP threads:ISO 1179-1 orDIN 3852-2 form XFor metric threads:ISO 9974-1 orDIN 3852-1 form X

Parallel metric thread DIN 3852 – 1 and 11 BSP parallel thread DIN 3852 – 2 and 11

* The turned groove d4 is only necessarywhen using a sealing ring conforming toDIN 7603 standard.

** The turned groove corresponds to d7

General technical informationThreaded fittings, tapped holes

Threaded fittingsBSP threads:DIN 3852-2 form ASealing by O-ringMetric threads:DIN 3852-1 form ASealing by O-ring

Threaded fittingsBSP threads:ISO 1179-4 orDIN 3852-2 form BSealing by sealingfaceMetric threads:ISO 9974-3 orDIN 3852-1 form BSealing by sealingface

7

C ±0,1d10

+/-0,02d11

mind12

+0,1d13 d14 min

b7minb8

+0,4b9

maxa3

±1°a

M10x1 14,5 13,8 20 11,1 14,5 11,5 10 1,6 1 12°M12x1,5 17,5 16,8 23 13,8 17,5 14 11,5 2,4 1,5 15°M14x1,5 19,5 18,8 25 15,8 19,5 14 11,5 2,4 1,5 15°M16x1,5 22,5 21,8 28 17,8 22,5 15,5 13 2,4 1,5 15°M18x1,5 24,5 23,8 30 19,8 24,5 17 14,5 2,4 2 15°M20x1,5 27,5 26,8 32 21,8 25,5 17 14,5 2,4 2 15°M22x1,5 27,5 26,8 34 23,8 27,5 18 15,5 2,4 2 15°M26x1,5 30,9 37 29,05 31 18,5 16 3,1 2 15°M27x2 32,5 31,8 40 29,4 32,5 22 19 3,1 2 15°M33x2 41,5 40,8 49 35,4 41,5 22 19 3,1 2,5 15°M42x2 50,5 49,8 60 44,4 50,5 22,5 19,5 3,1 2,5 15°M48x2 55,5 54,8 66 50,4 55,5 25 22 3,1 2,5 15°

General technical informationThreaded fittings, tapped holes

Tapped holesISO 6149-1

Threaded fittingsISO 6149-2 and 3Sealing by O-ring

Threaded fittingsISO 6149-2 and 3Sealing by O-ring

Adjustable couplings with lock nuts

Marque

8

C d5 d6 d7 mind8

±0,05d9 d10 min

b4min

5+0,4b6

maxa2

±1°a

7/16"-20UNF 16,5 16 16 21 12,45 15 14 11,5 2,4 1,6 12°1/2"-20UNF 18,5 20 17 23 14,05 16 14 11,5 2,4 1,6 12°9/16"-18UNF 20,5 21 17,6 25 15,7 18 15,5 12,7 2,5 1,6 12°3/4"-16UNF 26 26 22,3 30 20,65 22 17,5 14,3 2,5 2,4 15°7/8"-14UNF 29,5 28 25,5 34 24 26 20 16,7 2,5 2,4 15°1 1/6"-12UN 36,5 33 31,9 41 29,2 32 23 19 3,3 2,4 15°1 5/16"-12UN 44,5 41 38,2 49 35,55 38 23 19 3,3 3,2 15°1 5/8"-12UN 55 50 48 58 43,55 48 23 19 3,3 3,2 15°1 7/8"-12UN 62 56 55 65 49,9 54 23 19 3,3 3,2 15°

General technical informationThreaded fittings, tapped holes

Threaded fittingsISO 11 926-2 and 3 UN/UNF 2A toANSI B1./ISO 725Sealing by O-ring For couplings with

lock nuts to

Tapped holesISO 11 926-1 UN/UNF 2B toANSI B1.1/ISO 725

9

C minb2

M8x1 5,5M10x1 5,5M12x1,5 8,5M14x1,5 8,5M16x1,5 8,5M18x1,5 8,5M20x1,5 10,5M22x1,5 10,5

C minb3

1/8NPT 11,61/4NPT 16,43/8NPT 17,41/2NPT 22,63/4NPT 23,11NPT 27,81 1/4 NPT 28,31 1/2 NPT 28,3

C minb2

R1/8 5,5R1/4 8,5R3/8 8,5R1/2 10,5

General technical informationThreaded fittings, tapped holes

Threaded fittingsBSP threads:DIN 3852-2 form CSealing by taperthreadMetric threads:DIN 3852-1 form CSealing by taperthread

Tapped holesFor BSP threads:DIN 3852-2 form ZFor metric threads:DIN 3852-1 form Z

Threaded fittingsNPT(ANSI/ASME B1.20.1-1983)

Tapped holesNPT(ANSI/ASME B1.20.1-1983)

For taper threads, correct tightness requires the use of a thread sealing aid.

Taper metric thread DIN 3852 - 1

BSP taper thread DIN 3852 – 2

NPT thread

10

C

M8x1 6,1x1,6M10x1 8,1x1,6M12x1,5 9,3x2,2M14x1,5 11,3x2,2M16x1,5 13,3x2,2M18x1,5 15,3x2,2M20x1,5 17,3x2,2M22x1,5 19,3x2,2M26x1,5 22,7x2,8M27x2 23,6x2,9M33x2 29,6x2,9M42x2 38,6x2,9M48x2 44,6x2,9

C

7/16"-20 UNF 8,92x1,831/2"-20 UNF 10,52x1,839/16"-18 UNF 11,89x1,983/4"-16 UNF 16,36x2,27/8"-14 UNF 19,18x2,461 1/16"-12 UN 23,47x2,951 5/16"-12 UN 29,74x2,951 5/8"-12 UN 37,47x31 7/8"-12 UN 43,69x3

C

G 1/8 A 8,1x1,6G 1/4 A 11,32x2,2G 3/8 A 13,94x2,62G 1/2 A 17,86x2,62G 3/4 A 23,47x2,62G 1 A 29,74x3,53G 1 1/4 A 37,7x3,53G 1 1/2 A 44,04x3,53

O-rings

O-rings for metric threaded fittingsto ISO 6149 – 2and 3

O-rings for adjustable couplingswith lock nut ISO 8434-1.Metric threaded fittings to ISO 261

O-ring

O-ringsfor UN/UNF tapped holesto ISO 11926 – 1 O-ring

O-ringsfor adjustable couplingswith lock nut ISO 8434-1.BSP threaded fittingsto ISO 1179-3

O-ring

General technical information

11

A technical guide with animated presentations of these couplings.

Discover on the legris.com website

General technical information

LLG

1/8"

1818

L

G1/

8"18

18G

1/4"

4040

G3/

8"80

80G

1/2"

140

110

G1/

2"11

011

0G

3/4"

180

180

G1"

330

300

G11

/4"

540

470

G11

/2"

630

540

S

G1/

4"55

50G

3/8"

9080

G1/

2"16

012

0G

1/2"

140

120

G3/

4"27

018

0G

1"40

030

0G

11/4

"58

047

0G

11/2

"70

056

0

L

M10

x118

1815

M12

x1,5

3025

25M

14x1

,545

4535

M16

x1,5

6060

40M

18x1

,580

8045

M22

x1,5

150

125

60M

26x1

,519

018

010

0M

27x2

220

100

M33

x230

030

016

0M

42x2

500

450

210

M48

x270

054

026

0

S

M12

x1,5

4035

35M

14x1

,555

5545

M16

x1,5

7070

55M

18x1

,511

090

70M

20x1

,515

012

580

M22

x1,5

170

135

100

M27

x227

018

017

0M

33x2

430

310

310

M42

x254

047

033

0M

48x2

700

580

420

12

Serie

sTig

hten

ingto

rque

(Nm

)BS

Ppa

ralle

lfo

rmB

form

E

form

Bfo

rmE

Serie

sM

etric

para

llel

Tight

ening

torq

ue(N

m)

form

Efo

rmB

form

F

form

Bfo

rmE

form

F

Tigh

teni

ngto

rque

sfo

rth

read

edco

uplin

gsD

IN23

53/

ISO

8434

-1/4

coup

lings

The

figur

esgi

ven

appl

yto

thre

aded

coup

lings

inst

eelw

itha

phos

phat

edor

zinc

-coa

ted

surf

ace,

and

tolo

cknu

tsfit

ted

toco

uplin

gsw

ithst

eelf

emal

eth

read

s.Fo

rre

duci

ngad

apto

rs80

65–

8068

–80

69–

8075

–80

78an

d80

79,r

efer

toth

eto

rque

for

seri

esS

.

General technical information

L

M10

x115

M12

x1,5

25M

14x1

,535

M16

x1,5

40M

18x1

,545

M22

x1,5

60M

27x2

100

M33

x216

0M

42x2

210

M48

x226

0

S

M12

x1,5

20M

14x1

,545

M16

x1,5

55M

18x1

,570

M22

x1,5

100

M27

x217

0M

33x2

310

M42

x233

0M

48x2

420

L

M10

x118

M12

x1,5

35M

14x1

,555

M16

x1,5

80M

18x1

,510

5M

22x1

,512

5M

27x2

220

M33

x237

0M

42x2

500

M48

x260

0

S

M12

x1,5

35M

14x1

,555

M16

x1,5

80M

18x1

,510

5M

22x1

,512

5M

27x2

220

M33

x237

0M

42x2

500

M48

x260

0

L

G1/

8A25

G1/

4A35

G3/

8A80

G1/

2A10

5G

3/4A

220

G1A

370

G1"

1/4A

500

G1"

1/2A

600

S

G1/

4A35

G3/

8A80

G1/

2A10

5G

3/4A

220

G1A

370

G1"

1/4A

500

G1"

1/2A

600

L

7/16

" -20U

NF

191/

2"-2

0UN

F25

9/16

" -18U

NF

403/

4"-1

6UN

F60

7/8"-1

4UN

F80

11/16

" -12U

N11

015/

16" -1

2UN

160

15/8"-1

2UN

300

17/8"-1

2UN

340

S

7/16

" -20U

NF

211/

2"-2

0UN

F25

9/16

" -18U

NF

503/

4"-1

6UN

F80

7/8"-1

4UN

F14

011/

16" -1

2UN

190

15/16

" -12U

N16

015/

8"-1

2UN

350

17/8"-1

2UN

430

13

Adju

stabl

eco

uplin

gsw

ithlo

cknu

tsAd

justa

ble

coup

lings

with

lock

nuts

Adju

stabl

eco

uplin

gsw

ithlo

cknu

tsAd

justa

ble

coup

lings

with

lock

nuts

Serie

s

Tight

ening

torq

ue(N

m)

+/-10

%BS

Ppa

ralle

lSe

ries

Tight

ening

torq

ue(N

m)

+/-10

%M

etric

para

llel

Serie

s

Tight

ening

torq

ue(N

m)

+/-10

%M

etric

para

llel

Serie

s

Tight

ening

torq

ue(N

m)

+/-10

%UN

/UNF

General technical information

14

Tube selectionTube materiallWe recommend cold drawn steel tube , without welding, St 37,4 or St 52,4, DIN 1630 (or R 37or R 50ISO 3304), annealed in white NBK under neutral atmosphere, with tolerances on the outside andinside diameters according to DIN 2391 (or ISO 3304). Depending on the use, tube can be phos-phated, lubricated or electro-coated and bi-chromated.lFor flare couplings, a tube quality which can be flared, should be used. For weld nipples, tube that issuitable for welding should be used.

Tube thicknessThe design pressures given below have been calculated in accordance with the following formula:

K= 360 N/mm2 (tensile strength)Da= outside diameter in mmDi= inside diameter in mmS= safety factorln= natural logarithmThe formula is based on Hooke's law, in that the maximum stress in tangential directionimpinges on the inside of the pipe. It is more accurate than previously used formulae(DIN 2413) and will in the future be standardized internationally (ISO 10763).Safety factor S:S = 4 according to ISO 10763 standard

Tube diameterDiameter selection is essential in order to optimize the performance and cost of ahydraulic system.lA tube diameter which is too small increases the speed of fluid flow, whilst causing tur-bulence and an increase in temperature and pressure drop (called pressure loss). Theresult is an overconsumption of hydraulic system energy and more severe conditions of use (fluid temperatures, cavitation), which can lead to premature wear ofthe system components.

lA tube diameter which is too big increases both the dimension and the cost of the system.

We recommend the following flow speeds for hydraulic pipe work:- high pressure circuit: 3 to 6 m/s- return circuit 3 m/s maxi- venting circuit: 1 m/s maxiTo determine the inside diameter of the tube, the following formula can also be used :

Recommandations

15

4 0,5 2594 1 6245 0,5 2015 1 4606 1 3656 1,5 6246 2 9898 1 2598 1,5 4238 2 6248 2,5 883

10 1 20110 1,5 32110 2 46010 2,5 62410 3 82512 1* 16412 1,5 25912 2 36512 2,5 48512 3 62412 3,5 78814 2 30314 2,5 39814 3 50414 3,5 62414 4 76315 1,5* 20115 2 27915 2,5 36515 3 46016 2 25916 2,5 33716 3 42318 1,5* 16418 2 22618 2,5 29318 3 365

20 2 20120 2,5 25920 3 32120 3,5 38820 4 46022 1,5* 13222 2 18122 2,5 23222 3 28722 3,5 34525 2 15725 2,5 20125 3 24725 4 34725 5 46028 2* 13928 2,5 17728 3 21728 3,5 25930 2* 12930 3 20130 4 27930 5 36530 6 46032 2 12032 2,5 15332 3 18735 2* 10935 2,5 13935 3 16935 4 23435 5 30338 2* 10038 3 15538 4 21338 5 27538 6 34242 2* 9042 3 13942 4 19042 5 245

o.d. tube

Wall thicknessmm

Calculated pressureS = 4bar

o.d. tube

Wall thicknessmm

Calculated pressureS = 4bar

Recommandations

16

Couplings to DIN 2353 / ISO 8434-1/4PrincipleCutting ring couplings enable the easy assembly of hydraulic pipe circuits, guaranteeinga high level of security.These couplings comprise a body, a cutting ring and a tightening nut. Depending on thepressure of an installation, the Legris range offers bodies and nuts in 3 series: LL, for lowpressure, L for medium pressure and S for high pressure. Several cutting ring models are also available, giving maximum performance adapted tovarious installation problems.

the DiNova cutting ring,for all hydraulic installationsThe DiNova ring is an answer to the sealing and safety requirements of hydraulic installations. Its performance is based on metal/metal sealing, reinforced by 2 PTFE sealsand a gripping safety ensured by 3 bites. Principal advantages:lSeal protection: the geometry of the seal cavity prevents distortion and guaranteesresistance to vibration. The protection of the seal is ensured throughout assembly,- itwill not compress until final crimping has been achieved (Legris patent).Its two PTFE seals enable repeated assembly with no deterioration in performance overtime. In addition, they resist almost all aggressive fluids and a wide range of temperatures.lReliability and easy assembly: a mechanical stop clearly indicates the crimp positionand avoids the risk of insufficient tightening or over-tightening. lSafe connection: three bites ensure a more precise assembly, less tube distortion andreinforce the safety of connection, even in severe conditions of use. Thanks to an increa-sed area of interface with the tube upon tightening and the seal position within theassembly, the DiNova ring resistance to vibrations is extremely good. Visual control for proper crimping is possible (according to DIN 3859-2).

17

Couplings to DIN 2353 / ISO 8434-1/4the double-bite ring, for standard applicationsBy combining simplicity and assembly safety with good sealing performance, the Legrisdouble-bite ring is a solution well adapted to many hydraulic applications.During the assembly, its two bites penetrate the tube one after the other. When tightening the nut, the cutting bites (1) and (2) penetrate the pipe wall and raise visiblecollars (5) and (6) around the pipe surface. The ring body (3) becomes wedged betweenthe pipe wall and the inner cone thus preventing the advance of the double-bite ring.Part (4) projects forward to the end of the pipe and lies firmly against it. This dampensvibration which is then absorbed by ring body (3) preventing it from reaching the pipegrooves (1) and (2). This arrangement produces maximum compression strength andresistance to the effect of temperature fluctuations. When fitted properly, repeatedassemblies are possible.

the single-bite cutting ring, for low pressure circuits (couplings only series LL)The Legris single-bite ring is suitable for applications lower than 100 bar. Its low tightening torque enables easy use. When tightening the nut, the cutting ring, with its pre-formed and hardened cutting bite(1) moves along the 24° inner cone of the coupling body. The cutting ring engages thepipe, cuts into the surface with its cutting edge and produces a visible collar (4). The pipe, which is cut at right angles (2) must push against the locating face in the body, without fail, in order to ensure a secure bite. Due to the inter-nal shape of the cutting ring, vibration of the pipe is prevented.

18

LL L S4 5 6 8 6 8 10 12 15 18 22 28 35 42 6 8 10 12 14 16 20 25 30 38

24 25 25 26 31 31 33 33 36 38 42 42 48 48 35 35 37 37 43 43 50 54 58 6530 32 32 33 39 39 42 42 45 48 53 53 60 60 44 44 47 47 54 54 63 68 73 82

Note on lubricationGalvanized couplings have a colourless lubricant coating. Lubrication of the couplingscomponents is unnecessary (diameters smaller than 20 mm). In the case of bonded couplings and galvanized couplings that are still in circulation, thethread of the nut and the cone of the coupling body should be oiled.

Series

o.d. tube

H min.

L min.

Couplings to DIN 2353 / ISO 8434-1/4Tube preparation1- Saw the tube square (do not use a tube cutter). A 0,5° angular gap is acceptable.2- Deburr the tube inside and outside. Acceptable chamfer 0,2 x 45°. Clean.3- To ensure safe assembly, reinforcement should be used for tubes which are made of

copper or aluminium and for thin walled steel tubes. 4- Minimum length of straight tube with tube bends and minimum straight tube length,

see table.

19

6 8 10 12 14 15 16 18 20 22 25 28 30 35 38 42

1-2

1-2,5

1-3

1-3,5

2-4

1,5-3

2-3

1,5-3

2-4

1,5-3,5

22,5-5

2-3,5

2-4

5-6

22,5-5

2-3

4-6

23-5

25 30 35 40 45 45 55 55 70 70 90 80 110 100 135 125

25 25 25 45 45 45 55 55 70 80 90 130 80 130 160 130 160 130 170 130 170

1- Select the retainer plates and the pre-installed body, according to series of the modeland pipe size.

2- Push the nut and the cutting ring onto the sawn-off and deburred pipe.3- Insert the pipe so that the nut and cutting ring lie between the retainer plates and installed body.4- Press the pipe end firmly against the stop of the pre-installed body. 5- Hold firmly the pipe end in position and press the control button until the

pre-assembled unit automatically stops.6- After completion of pre-assembly, remove the pipe. 7- Check whether a visible flange projection is present.Final installation: Screw on the nut, by hand, until contact is perceptible. Hold the coupling body with a wrench and tighten the nut past the point of perceptible increase inforce approximately 1/4 to 1/3 turns, until no further tightening is possible.

InstallationInstallation with pre-assembly unit - single-bite, double-bite, andDiNova rings The pre-assembled pressure is different from each ring model to another. Please refer topressure data in the following table.

Pre-assembled pressures recommended for pipes St 37-4 to DIN 1630 and DIN 2391

o.d.tube (mm)

tube thickness(mm)

double-bit ring(bar)

DiNova ring(bar)

Couplings to DIN 2353 / ISO 8434-1/4

20

Couplings to DIN 2353 / ISO 8434-1/4Installation with pre-assembly block - single-bite, double-biteand DiNova rings Pre-installation:Lubricate the thread and the end of the pre-assembly block.1- Push the nut and the cutting ring onto the pipe.2- Screw on the nut until contact is perceptible.3- Push the pipe against the end of the lubricated pre-installation block, tightening the

nut approximately 1 1/4 turns(1 1/2 turns for DiNova ring), with the help of the wrench.Checking pre-assembly:4- After pre-assembly, slacken the nut. A visible cut edge must be present in front of the

cutting ring. The cutting ring may rotate, but will not permit axial displacement.Final installation in the coupling body:5- Screw on the nut by hand until noticeable contact is made. 6- Hold the coupling body with the wrench. Tighten the nut past the point of perceptible

increase in force approximately 1/4 to 1/3 turns.

21

Couplings to DIN 2353 / ISO 8434-1/4Manual installation - single-bite and double-bite rings1- Push the nut and the cutting ring onto the pipe.2- Screw on the nut until contact is detected.3- Press the pipe against the stop in the coupling body for correct pipe incision. With a

wrench, tighten the nut approximately 11/2 turns, whilst holding the coupling body inposition.

4- Checking: Disassemble the tube connection by slackening the nut. A visible cut edgemust be apparent in front of the cutting ring. The cutting ring may rotate, but will notpermit axial displacement.

Re-installationFor re-installation, tighten the nut with the same torque as the initial installation. For this,screw on the nut until contact is apparent, then tighten approximately 1/8 turn with awrench.

Manual installation - DiNova ring1- Push the nut and the DiNova ring onto the pipe.2- Screw on the nut until contact is noticeable.3- With the help of the wrench, tighten the nut until contact is perceptible, that is,

approximately 13/4 turns.4- Checking: Disassemble the connection by slackening the nut. A visible cut edge must

be apparent in front of the cutting ring. Re-installationScrew on then tighten by wrench, until contact is detected (approximately 1/6 turn).

22

L S8 10 12 15 18 22 28 35 42 8 10 12 14 16 20 25 30 38

23 28 40 50 65 100 110 170 260 23 28 40 55 65 100 140 170 260

25 35 45 60 85 110 130 215 330 40 50 60 75 80 120 170 250 350

Installation of adjustable couplings with lock nut1- Screw the lock nut on the coupling body. Release the seal and O-ring until contact with

coupling body is made. Lubricate the O-ring.2- For BSP and metric thread couplings, for tapped holes to DIN 3852, push the ring onto

the O-ring.3- Screw the body coupling by hand in the tapped hole until the contact with lock nut or

ring is perceptible. 4- Adjust the coupling body to the required direction (1 maximum turn).5- Screw the lock nut onto the seal and tighten with the wrench, according to the

information given at the beginning of this catalogue.

Couplings to DIN 2353 / ISO 8434-1/4Installation of 24° sealing cone couplings and pre-assembledcouplingsWhilst holding the coupling body with a wrench, tighten the nut by 1/4 to 1/3 turns onthe pre-assembled side after having determined a perceptible increase in force. The tube end with cutting ring, with flare or weld nipple-connection coupling is to beassembled according to the relevant assembly instructions for these couplings. To ensure the repeatability of the process, it is also possible to assemble 24° cone couplings by controlling the tightening torques. See the following table:

Tightening torque NM Min.

o.d. tube

Series

Tightening torque NM Max.

23

NutWeld nippleTube

Coupling bodyO-ring

Weld nipples ISO 8434-4 Weld nipples offer another method of connecting tube couplings. They are suitable foruse under extreme conditions of vibration, pressure surges and changes of temperature. The weld nipple (Form a DIN 3865 / ISO 8434-4) replaces the cutting ring and can beused in all fittings with a 24° inner cone (type of port end W DIN 3861 / ISO 8434-1) whilstusing the standard nut. Sealing is produced by the metal contact between the weld nipple and inner cone of the coupling body with the O-ring forming an additional seal.The O-ring must be always fitted after welding the tube. Installation by welding is an optimal gripping and sealing solution.1- Cut the tube at right angles and chamfer it for V-welding seam to DIN 2559.2- Slide the nut over the weld nipple as shown on the illustration.3- Weld nipple and tube according to general welding practise. Please ensure that not

globules of weld enter the inside of the tube. Nipple, groove and taper must also beclean.

4- Insert the O-ring into groove only after welding. Do not grease, but lubricate nipple,taper, internal and external threads.

5- Screw the nut by hand onto the body, then tighten with a wrench approximately 1/4 to1/3 turns. Tube with welded nipple has to be screwed and installed free of tension.

DIN 2353/ISO 8434-1/4 couplings: complementary range

24

DIN 2353/ISO 8434-1/4 couplings: complementary rangeAdaptors for 37° flareThese adaptors guarantee a reliable connection between 37° flare tube and the couplingbody with 24° cone (port end W DIN 3861 / ISO 8434-1). The most important structural element is the adaptor (2) which seals against the cone ofthe coupling body and the 37° angle of the flared tube. When assembling, the adaptorwith O-rings is pressed into the cone of the coupling body up to the stop face. On doing this, metal/metal sealing is produced between the inner cone and the adaptor,with the O-ring forming an additional seal. By means of the stop face on the adaptor, anyundue enlargement of the 24° cone is avoided; this design also ensures that the adaptorwill be pressed captively into the cone. When tightening the nut (4) further, the flared tube (3) is clamped, sealing between flaresleeve (5) and adaptor (2).The sealing of the tube side is also metal/metal, an O-ring forming an additional seal.

25

S

6x1 8,5 1,5 21,5 17,56x1,5 9 2 22 188x1 9 2 22 188x1,5 9,5 2,5 23 198x2 10 3 24 2010x1 10 2,5 25 2010x1,5 10,5 3 25,5 20,510x2 11,5 4 26 2112x1 9,5 2 25,5 2012x1,5 10 2,5 26 20,512x2 10,5 3 27 21,514x1,5 9,5 1,5 29 21,514x2 10,5 2,5 30 22,514x2,5 11 3 31 23,514x3 11,5 3,5 32 24,516x1,5 10 1,5 30,5 24,516x2 11 2,5 31,5 25,516x2,5 11,5 3 32 2616x3 12 3,5 33 2720x2 12,5 2 35 2820x2,5 13 2,5 35,5 28,520x3 13,5 3 36 2920x3,5 14,5 4 37 3025x2 15,5 3,5 39 30,525x2,5 16 4 40 31,525x3 17 5 41 32,525x4 18 6 42,5 3430x2 14 0,5 43 3330x2,5 14,5 1 43,5 33,530x3 15,5 2 44 3430x4 16,5 3 45,5 35,530x5 17,5 4 47 3738x2,5 17 1 52,5 3938x3 17,5 1,5 53 39,538x4 19 3 54,5 4138x5 20,5 4,5 56 42,5

L

6x1 8,5 1,5 21,5 17,56x1,5 9 2 22 188x1 9 2 22 188x1,5 9,5 2,5 23 198x2 10 3 24 2010x1 9 2 24 1910x1,5 10 3 25 2010x2 11 4 25,5 20,512x1 9 2 25 19,512x1,5 9,5 2,5 25,5 2012x2 10 3 26,5 2115x1,5 9 2 28,5 2115x2 9,5 2,5 29 21,515x2,5 10 3 30 22,518x1,5 8,5 1 28,5 22,518x2 9 1,5 29,5 23,518x2,5 9,5 2 30 2422x1,5 8,5 1 30,5 23,522x2 9 1,5 31,5 24,522x2,5 9,5 2 32 2522x3 11 3,5 33 2628x2 11,5 4 33,5 2528x2,5 12 4,5 34,5 2628x3 12,5 5 35 26,535x2 12 1,5 39,5 29,535x2,5 12,5 2 40 3035x3 13,5 3 41 3135x4 15 4,5 42,5 32,542x2 12 1 46 32,542x3 13,5 2,5 47,5 3442x4 15 4 49 35,5

AD x s T x H1 H2 AD x s T x H1 H2

DIN 2353/ISO 8434-1/4 couplings: complementary range

Series Tube size Series Tube size

Adaptors for 37° flareDetermining tube length, Overall lengthIn order to determine the length of the tube before flaring, the dimension X must be deducted fromeach tube end which is to be connected to a coupling body. When using the dimension tables to calculate the tube length, the dimension T must be used. T represents the difference in tube lengthbetween the flare coupling and the cutting ring coupling. The overall lengths for flare couplings canbe determined by means of the dimensions H1 and H2.

6 8 10 12 14 15 16 18 20 22 25 28 30 35 38 429,1 11,3 13,1 15,3 18,6 19,1 20,6 23,2 25,6 26,5 31,1 32,7 37 41,8 46 48,8

10,0 12,0 14,0 16,0 19,6 20,0 22,0 24,0 26,8 27,5 33,0 33,3 38,7 42,7 47,2 49,8DB min.DB max.

26

NutFlare sleeveTubeCoupling body Intermediate cone

DIN 2353/ISO 8434-1/4 couplings: complementary rangeAdaptors for 37° flare

Installation1- Cut the tube square (do not use a pipe cutter).2- Deburr the pipe inside and outside, do not chamfer. Clean the tube end, otherwise the

sealing surface of the tube will be damaged when it is flared.3- Slide the nut and the collar over the tube as shown in the illustration.4- Flare the tube by means of flaring tools or flaring machine. The flare diameter DB must not

be beyond the limits given in the table. The flare cone must be square to the tubular axisand concentric to the collar. The inner cone must be clean and free of burrs.

5- Insert the adaptor into the coupling body and press flared tube onto the adaptor. Screw thenut by hand. Then, tighten the nut with a spanner until the adaptor is pressed captively intothe coupling body. When torque must be intensified, tighten the nut approximately 1/4 turnmore. Each time the connection is slackened, it can be retightened without any intensified torque.

o.d. tube

27

Make the system easy to maintain.

In order to optimize the performance of a hydraulic system, we recommend thefollowing:

Tube installation

Always fix tubes on fixed pointswith clamps.

Avoid excess force on connectionsas stresses may cause leaks.

To avoid stresses on connections:position clamps on each side theconnection point.

28

E

L

S

012345

4 045 056 06 1/4" 568 08 5/16" 58

10 10 3/8" 6012 12 1/2" 6214 1415 1516 16 5/8" 6618 18 3/4" 6920 2022 2225 25 1" 7528 2830 3035 35 1"1/4 8238 38 1"1/2 8842 42

M6x1 52M8x1 56M10x1 60M12x1 65M12x1,5 67M14x1 69M14x1,5 71M16x1,5 75M18x1,5 78M20x1,5 80M22x1,5 82M24x1,5 83M26x1,5 89M27x2 86M33x2 91M36x2 93M42x2 96M48x2 98

1/8 101/4 133/8 171/2 213/4 271" 341"1/4 421"1/2 49

7/16-20 1031/2-20 1049/16-18 1053/4-16 1077/8-14 1081 1/16-12 1531 5/16-12 1571 5/8-12 1621 7/8-12 166

1/8 111/4 143/8 181/2 223/4 281" 351"1/4 431"1/2 50

UN/UNF thread Code

Metric thread Code BSP thread Code NPT thread CodeØD mm Code ØD inch Code

BSP thread 10 = 1/8

Outside diameter of tube 06 = 6 mmSeries code L

Product type 3 = DiNova cutting ring

Practical informationIdentification of Legris part numbersTo help users, Legris classifies its product ranges with specific part numbers which provideeasy identification of each item. Part numbers have been chosen by a method of mnemonics. Each coupling is identified by:lthe product type (4 numbers)lthe series (1 letter)lthe outside diameter of tube (2 numbers)lthe thread code (2 numbers)

Product typeSeries code

outside diameter of ube thread

Series LL

Series L

Series S

the 2nd number corresponds to the modelaccording to the following code:Body onlySingle-bite cutting ring Double-bite cutting ring DiNova cutting ring 37° flare couplings and adaptors24° sealing cone couplings