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91257A737 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91257A737: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.312 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.250 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN, fastener_length: 6.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-591-5527, 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
91257A737
NSN: 5305-01-591-5527
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.312 INCHES NOMINAL IN
thread_class2A A
thread_length1.250 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
fastener_length6.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_between_flats0.750 INCHES NOMINAL IN
end_item_identificationMRAP BUFFALO MK2A2
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch13
NSN5305-01-591-5527
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91257A737 · 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
•
HEAD HEIGHT: 0.312 INCHES NOMINAL IN
•
FASTENER LENGTH: 6.500 INCHES NOMINAL IN
•
THREAD LENGTH: 1.250 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.750 INCHES NOMINAL IN
•
SURFACE TREATMENT: ZINC OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.312 INCHES NOMINAL IN
FASTENER LENGTH6.500 INCHES NOMINAL IN
THREAD LENGTH1.250 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.750 INCHES NOMINAL IN
SURFACE TREATMENTZINC OVERALL
THREAD CLASS2A A
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 1
B1821BH050C650NReference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 91257A737?
91257A737 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 91257A737?
There is 1 known substitute for 91257A737: B1821BH050C650N. Substitute compatibility should be verified for your specific system.
What is the NSN for 91257A737?
91257A737 is cataloged in the U.S. Government catalog under NSN 5305-01-591-5527. 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.