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Technical Data Sheet
PartsTable / COMPONENT / 7971768
7971768 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, head_style: HEXAGON, head_height: 0.375 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.530 INCHES MINIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-638-7863, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
7971768
NSN: 5306-00-638-7863
FSC: 5306
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OVERALL
head_styleHEXAGON
head_height0.375 INCHES NOMINAL IN
thread_class2A A
thread_length0.530 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length4.595 INCHES NOMINAL IN
hardness_rating38.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length3.900 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.8725 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM FIRST SHOULDER IN
width_between_flats1.000 INCHES NOMINAL IN
NSN5306-00-638-7863
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 7971768 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH BETWEEN FLATS: 1.000 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.375 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 4140 OVERALL
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
THREAD SERIES DESIGNATOR: UNF
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
FASTENER LENGTH: 4.595 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS1.000 INCHES NOMINAL IN
HEAD HEIGHT0.375 INCHES NOMINAL IN
MATERIALSTEEL COMP 4140 OVERALL
SHOULDER SHAPEROUND FIRST SHOULDER
THREAD SERIES DESIGNATORUNF
NOMINAL THREAD DIAMETER0.625 INCHES IN
FASTENER LENGTH4.595 INCHES NOMINAL IN
THREAD QUANTITY PER INCH18
THREAD LENGTH0.530 INCHES MINIMUM IN
SHOULDER DIAMETER0.8725 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM FIRST SHOULDER IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
906396Interchangeable
interchangeable cross-reference
interchangeable
145524465Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7971768?
7971768 is a BOLT,SHOULDER.
What parts can replace 7971768?
There are 2 known substitutes for 7971768: 906396, 145524465. Substitute compatibility should be verified for your specific system.
What is the NSN for 7971768?
7971768 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-638-7863. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026