NUTS AND

LOCKING DEVICE ISSAM AL-BELTAJI

KAU

JOINTS

FIXED JOINT

PERMENENT FIXATION

WELDING

RIVITS

TEMPERORY FIXATION

BOLTED JOINT

MOVABLE JOINT

SHAFT

GEARS

OTHERS

WHAT IS THE NUT?

•A nut is a thick metal ring which

you screw onto a metal rod called

a bolt. Nuts and bolts are used to

hold things such as pieces of

machinery together.

WHAT IS THE

LOCKIN DEVICE?

• Locking device is a device

used to secure a nut and

prevent it working loose or to

moving from its place

TYPES OF NUTS

•There are more many types of

nuts used in various field.

OTHER TYPES OF NUTS.

TYPES OF

LOCKING DEVICE.

Locking devices

available include nuts,

clips, keys and washers.

THIS NUTS ALSO LOCKIN DEVICE.

Elastic stop nuts

With this type of device there is a slot inside the nut

above the thread which holds a fiber or nylon ring.

As the nut is tightened down, this insert is deformed

by the bolt thread and the very high degree of

friction between the thread and the insert prevents

the nut loosening. Elastic stop nuts are frequently

used to secure electrical equipment such as

transformers or loudspeakers.

DID YOU REMEMBR NYLON INSERT

LOCK NUT ??

• Spring lock washers

Tooth lock washers

Spring nuts

Circlips

O-rings

Cotter pins

Round nut

locknut

• in which the

threads are

deformed after

cutting.

special tab is bent to

secure the nut.

American Society for

Testing and

Materials (ASTM), Alloy &

Carbon Steel Nut Materials

Specifications:

ASTM A194 Grade A- Low Carbon, Non-Heat Treat, Heavy Pattern

ASTM A194 Grade C- Recommended use with A325 Structural Bolts,

Lock Nut Spec.

ASTM A194 Grade GT- Automation Flange Lock Nut, C1022-1045

SteelGrade 2- Low Carbon, Non- Heat Treat, Finished Pattern

ASTM A194 Grade 2H-Recommended use with A325 Structural Bolts,

High Pressure & High Temp.

ASTM A194 Grade 2HM-Grade 5-

ASTM A194 Grade DH- Recommended use with A490 Type 1

Structural Bolts

ASTM Grade DH3- Recommended use with A490 Type 3 Structural

BoltsGrade 8-

ASTM A194 Grade F- Large Flange Nut, AISI 1008-1035 steel

ASTM A194 Grade 4-

ASTM A194 Grade L7-ASTM A194 Grade L7M-Stainless Steel-

ASTM A194 Grade 8-Series Stainless Steel, Heavy Pattern

ASTM A194 Grade 8M- 316 Series Stainless Steel, Heavy Pattern

METRIC NUT SIZE

• ASME - American Society of Mechanical Engineers

• IFI - Industrial Fastener Institute

• ISO - International Organization for Standardization

• ANSI - American National Standards Institute

• DIN - Deutsches Institut fur Normung

• JIS - Japanese Industrial Standard

Organizations for

Standardization

THANK YOU FOR:

• DR. AHMAD KHAIRY ABDELLATIF.

• DR. MAMDOH ALGENDY.

THE END