document.xls

BOLT TORQUE - THREAD STRENGTH CALCULATION

ISO METRIC SCREW THREADS TO AS 1721

BOLT DATA

MATERIAL

THREAD TOLERANCE CLASS

DIAMETER mm

THREAD PITCH

THREAD NOMINAL THREAD PITCH DIAMETER

THREAD MINIMUM MAJOR DIAMETER

THREAD MINIMUM PITCH DIAMETER

MINIMUM TENSILE STRESS MPa

YIELD STRESS MPa

PROOF STRESS MPa

CORE AREA 0

TENSILE STRESS AREA 0

SHANK AREA 0

PREFERRED BOLT LOAD & TORQUE

BOLT UTILISATION BASED ON

PREFERRED BOLT UTILISATION % OF YIELD STRESS

BOLT CONDITION

TORQUE COEFFICIENT (NUT FACTOR) #N/A

BOLT LOAD BASED ON

PREFERRED BOLT LOAD 0 kN

PREFERRED BOLT TORQUE #N/A Nm

NUT DATA

NUT MATERIAL

THREAD TOLERANCE CLASS mm

THREAD MAXIMUM PITCH DIAMETER

THREAD MAXIMUM MINOR DIAMETER

ULTIMATE TENSILE STRESS MPa

YIELD STRESS MPa

THREAD STRENGTH

ULTIMATE BOLT LOAD 0 kN

THREAD ENGAGEMENT TO DEVELOP FULL BOLT STRENGTH #DIV/0! mm

THREAD ENGAGEMENT TO YIELD THREADS AT FULL BOLT STRENGTH #DIV/0! mm

#DIV/0! mm

FORCE REQUIRED TO STRIP mm LENGTH OF THREADS #DIV/0! kN

FORCE REQUIRED TO YIELD mm LENGTH OF THREADS #DIV/0! kN

SELECTED BOLT LOAD & TORQUE

REQUIRED SAFETY FACTOR ON THREAD YIELD

RECOMMENDED BOLT LOAD #DIV/0! kN

RECOMMENDED BOLT LOAD AS A % OF YIELD STRESS #DIV/0! %

RECOMMENDED BOLT TORQUE #DIV/0! Nm

SELECTED BOLT TORQUE Nm

SELECTED BOLT LOAD #DIV/0! kN

mm2

mm2

mm2

document.xls

SELECTED BOLT LOAD AS A % OF YIELD STRESS #DIV/0! %

FAILURE OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE & YIELD OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE

TORQUE VALUES CALCULATED USING FORMULA T = KDP

WHERE T = TORQUE (Nm), K = TORQUE COEFFICIENT, D = NOMINAL DIAMETER (mm), P = BOLT CLAMP LOAD (kN)

document.xls

BOLT TORQUE - THREAD STRENGTH CALCULATION

ISO METRIC SCREW THREADS TO AS 1721

% OF YIELD STRESS

document.xls

FAILURE OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE & YIELD OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE

TORQUE VALUES CALCULATED USING FORMULA T = KDP

= TORQUE COEFFICIENT, D = NOMINAL DIAMETER (mm), P = BOLT CLAMP LOAD (kN)

BOLT DIAMETERS BOLT AREAS

5 6 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 BOLT PITCH AREAS

SIZE

CORE TENSILE SHANK

(mm) (mm) STRESS

0 0 0 0 0

BOLT MECHANICAL PROPERTIES

MIN TENSILE STRESS YIELD STRESS PROOF STRESS

(MPa) (MPa) (MPa)

0 0 0

NUT MECHANICAL PROPERTIES

MIN TENSILE STRESS YIELD STRESS

(MPa) (MPa)

0 0

(mm2)

STRENGTH OF METRIC THREADS

BOLT TORQUE COEFFICIENTS

1 2 TENSILE STRENGTH OF THE BOLT MATERIAL, Sst =

BOLT CONDITION K YIELD STRESS OF THE BOLT MATERIAL =

1px1 (MOLY)V 0.18

AS RECEIVED 0.20 NUT PLATE THICKNESS =

AS RECEIVED OR LIGHTLY OILED & LOCTITE 771 0.13 ULTIMATE TENSILE STRENGTH OF THE NUT MATERAL, Snt =

BOWMAN ANTI-SEIZE 0.12 YIELD STRENGTH OF THE NUT MATERIAL =

CADMIUM PLATED 0.17

PROOF STRESS CADMIUM PLATED (DEGREASED) 0.20

(MPa) CADMIUM PLATED (LIGHTLY OILED) 0.14

0 CADMIUM PLATED (LIGHTLY OILED & LOCTITE 243) 0.13

CLEAN, NONPLATED, AS RECEIVED 0.20

COPPER BASED ANTI-SEIZE 0.16 TENSILE STRESS AREA =

DEGREASED & LOCTITE 243 0.20

DRY 0.30

EXPOSED TO ELEMENTS, BEGINNING TO OXIDISE 0.30

GALVANISED (DEGREASED) 0.42 LENGTH OF THREAD ENGAGEMENT REQUIRED TO DEVELOP FULL STRENGTH:

GALVANISED (LIGHTLY OILED) 0.22

GENERAL MACHINE OIL 0.20 NUT AND BOLT ARE OF EQUAL-STRENGTH MATERIALS.

GREASE 0.16

GREASE (HEAVY) 0.14 BOLT TOLERANCE CLASS =

HOT DIPPED GALVANISED 0.25 NUT TOLERANCE CLASS =

INORGANIC SILICATE (IOZ) 0.17

LIGHTLY OILED 0.20

LIGHTLY OILED & LOCTITE 243 0.14 NOMINAL PITCH DIAMETER OF THE BOLT, d2 =

LOCTITE MOLY PASTE 0.11

LOW FRICTION OIL 0.15 LENGTH OF THREAD ENGAGEMENT REQ'D TO DEVELOP FULL STR., LE =

MOLYBDENUM DISULPHIDE BASED GREASE 0.14

MOLYBOND GA50 0.14 SHEAR AREA AT PITCH LINE OF BOTH THREADS, AS=

MOLYKOTE 0.18

MOLYKOTE P74 0.14 ULTIMATE SHEAR STRENGTH OF THE MATERIAL, SU ~=

NICKEL BASED ANTI-SEIZE 0.15

NEVER-SEIZE (PASTE) 0.17 FORCE REQUIRED TO STRIP THREADS, F =

NONPLATED, BLACK FINISH 0.30

PHOSPHATED (LIGHTLY OILED) 0.14 LENGTH OF THREAD ENGAGEMENT REQUIRED TO YIELD THREAD AT FULL STRENGTH

PHOSPHATED (LIGHTLY OILED & LOCTITE 243) 0.11

PHOSPHATED (DEGREASED) 0.24 NUT AND BOLT ARE OF EQUAL-STRENGTH MATERIALS.

PHOSPHATED (DEGREASED & LOCTITE 243) 0.14

SOLID PTFE FILM 0.12

TEFLON 7630 0.09 NOMINAL PITCH DIAMETER OF THE BOLT, d2 =

WAXED 0.10

XYLAN 0.10 LENGTH OF THREAD ENGAGEMENT REQ'D TO DEVELOP FULL STR., LE =

ZINC PLATED 0.22

ZINC PLATED (DRY) 0.29 SHEAR AREA AT PITCH LINE OF BOTH THREADS, AS=

ZINC PLATED (DEGREASED) 0.14

ZINC PLATED (DEGREASED & LOCTITE 243) 0.15 ULTIMATE SHEAR STRENGTH OF THE MATERIAL, SU ~=

ZINC PLATED (LIGHTLY OILED) 0.18

ZINC PLATED (LIGHTLY OILED & LOCTITE 243) 0.16 FORCE REQUIRED TO STRIP THREADS, F =

0 #N/A LENGTH OF THREAD ENGAGEMENT REQUIRED TO YIELD THREAD AT FULL STRENGTH, L =

SELECTED LENGTH OF THREAD ENGAGEMENT

SELECTED LENGTH OF THREAD ENGAGEMENT =

FORCE REQUIRED TO STRIP THREADS, F =

FORCE REQUIRED TO YIELD THREADS, F =

RECOMMENDED BOLT TORQUE

TORQUE CO-EFFICIENT =

SAFETY FACTOR ON THREAD YIELD =

YIELD STRESS OF THE BOLT MATERIAL =

RECOMMENDED BOLT LOAD =

RECOMMENDED BOLT TORQUE =

SELECTEDED BOLT TORQUE

SELECTED BOLT TORQUE =

SELECTED BOLT LOAD =

THREAD LIMITING DIMENSIONS

BOLT MATERIAL = 0.0 NOMINAL BOLT NUT FAILURE OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE

TENSILE STRENGTH OF THE BOLT MATERIAL, Sst = 0 MPa PITCH MIN. MAJOR MIN. PITCH MAX. MINOR MAX. PITCH

YIELD STRESS OF THE BOLT MATERIAL = 0 MPa DIAMETER DIAMETER DIAMETER DIAMETER DIAMETER YIELD OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE

NUT MATERIAL = 0 (mm) (mm) (mm) (mm) (mm)

NUT PLATE THICKNESS = 0 mm 0.000 0 0 0 0

ULTIMATE TENSILE STRENGTH OF THE NUT MATERAL, Snt = 0 MPa

YIELD STRENGTH OF THE NUT MATERIAL = 0 MPa

BOLT DIAMETER = 0 mm

BOLT THREAD PITCH = 0.00 mm

TENSILE STRESS AREA = 0.0

ULTIMATE BOLT LOAD = 0.0 kN

.: FAILURE OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE.

BOLT TOLERANCE CLASS = 0

NUT TOLERANCE CLASS = 0

NOMINAL PITCH DIAMETER OF THE BOLT, d2 = 0.000 mm

LENGTH OF THREAD ENGAGEMENT REQ'D TO DEVELOP FULL STR., LE = #DIV/0! mm

SHEAR AREA AT PITCH LINE OF BOTH THREADS, AS= #DIV/0! mm2

ULTIMATE SHEAR STRENGTH OF THE MATERIAL, SU ~= 0.0 MPa

FORCE REQUIRED TO STRIP THREADS, F = #DIV/0! kN

LENGTH OF THREAD ENGAGEMENT REQUIRED TO YIELD THREAD AT FULL STRENGTH

.: YIELD OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE.

NOMINAL PITCH DIAMETER OF THE BOLT, d2 = 0.000 mm

d2 dmin d2min D1max D2max

mm2

LENGTH OF THREAD ENGAGEMENT REQ'D TO DEVELOP FULL STR., LE = #DIV/0! mm

SHEAR AREA AT PITCH LINE OF BOTH THREADS, AS= #DIV/0! mm2

ULTIMATE SHEAR STRENGTH OF THE MATERIAL, SU ~= 0.0 MPa

FORCE REQUIRED TO STRIP THREADS, F = #DIV/0! kN

LENGTH OF THREAD ENGAGEMENT REQUIRED TO YIELD THREAD AT FULL STRENGTH, L = #DIV/0! mm

SELECTED LENGTH OF THREAD ENGAGEMENT = 0.0 mm

FORCE REQUIRED TO STRIP THREADS, F = #DIV/0! kN

FORCE REQUIRED TO YIELD THREADS, F = #DIV/0! kN

BOLT CONDITION = 0

BOLT PRELOAD = 0 % OF YIELD STRESS

TORQUE CO-EFFICIENT = #N/A

SAFETY FACTOR ON THREAD YIELD = 0.00

YIELD STRESS OF THE BOLT MATERIAL = 0 MPa

= 0.0

RECOMMENDED BOLT LOAD = #DIV/0! kN

% OF YIELD STRESS = #DIV/0! %

RECOMMENDED BOLT TORQUE = #DIV/0! Nm

SELECTED BOLT TORQUE = 0 Nm

SELECTED BOLT LOAD = #DIV/0! kN

% OF YIELD STRESS = #DIV/0! %

mm2

FAILURE OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE

YIELD OCCURS SIMULTANEOUSLY IN BOTH PARTS, AT THE PITCH LINE