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76957-001 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

76957-001: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OVERALL, head_style: DEE CHAMFER, head_height: 1.000 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 2.000 INCHES NOMINAL IN, thread_length: 1.531 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-416-2104, 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
76957-001
NSN: 5306-00-416-2104
FSC: 5306 — Bolts
CAGE: 14541 — COOPER MACHINERY SERVICES LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OVERALL
head_styleDEE CHAMFER
head_height1.000 INCHES NOMINAL IN
thread_class3A A
head_diameter2.000 INCHES NOMINAL IN
thread_length1.531 INCHES MINIMUM IN
fastener_length13.375 INCHES NOMINAL IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
nominal_thread_diameter1.125 INCHES IN
fifth_diameter_from_head1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN
first_diameter_from_head1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN
NSN5306-00-416-2104
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 76957-001 · 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
•
FOURTH DIAMETER FROM HEAD: 1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIFTH DIAMETER: 8.999 INCHES NOMINAL IN
•
HEAD HEIGHT: 1.000 INCHES NOMINAL IN
•
FASTENER LENGTH: 13.375 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO FLAT: 0.688 INCHES NOMINAL IN
•
THREAD LENGTH: 1.531 INCHES MINIMUM IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
SHANK UNTHREADED HOLE DIAMETER: 0.219 INCHES NOMINAL FIRST HOLE IN
TECHNICAL CHARACTERISTICS
FOURTH DIAMETER FROM HEAD1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIFTH DIAMETER8.999 INCHES NOMINAL IN
HEAD HEIGHT1.000 INCHES NOMINAL IN
FASTENER LENGTH13.375 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO FLAT0.688 INCHES NOMINAL IN
THREAD LENGTH1.531 INCHES MINIMUM IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER0.219 INCHES NOMINAL FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
76957-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 76957-001?
76957-001 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 76957-001?
There is 1 known substitute for 76957-001: 76957-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 76957-001?
76957-001 is cataloged in the U.S. Government catalog under NSN 5306-00-416-2104. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.