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4159377 — BOLT,SQUARE NECK

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4159377: BOLT,SQUARE NECK.

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: OVAL, neck_width: 0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN, head_height: 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN, neck_length: 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN, thread_class: 2A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-657-4458, 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
4159377
NSN: 5306-01-657-4458
NIINs: 016574458, 016690242
FSC: 5306 — Bolts
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleOVAL
neck_width0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN
head_height0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
neck_length0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.782 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN
screw_materialSTEEL
fastener_length1.688 INCHES MINIMUM AND 1.708 INCHES MAXIMUM IN
special_featuresSQARE NECK LOCKING FEATURE
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE ZINC OVERALL
NSN5306-01-657-4458
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4159377 · 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
•
NECK LENGTH: 0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.00 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.31 INCHES IN
•
HEAD STYLE: OVAL
•
THREAD DIRECTION: RIGHT-HAND
•
NECK WIDTH: 0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN
•
COLOR: BLACK OVERALL
TECHNICAL CHARACTERISTICS
NECK LENGTH0.156 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
HEAD HEIGHT0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
FASTENER LENGTH1.00 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.31 INCHES IN
HEAD STYLEOVAL
THREAD DIRECTIONRIGHT-HAND
NECK WIDTH0.307 INCHES MINIMUM AND 0.324 INCHES MAXIMUM IN
COLORBLACK OVERALL
SPECIAL FEATURESMATERIAL: GRADE 5
SURFACE TREATMENTPHOSPHATE ZINC OVERALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4159377?
4159377 is a BOLT,SQUARE NECK.
What is the NSN for 4159377?
4159377 is cataloged in the U.S. Government catalog under NSN 5306-01-657-4458. 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.