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91280A538 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91280A538: 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: 5.3 MILLIMETERS NOMINAL MM, thread_length: 16.0 MILLIMETERS NOMINAL MM, fastener_length: 30.0 MILLIMETERS NOMINAL MM, hardness_rating: 22.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-533-5235, 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
91280A538
NSN: 5305-01-533-5235
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height5.3 MILLIMETERS NOMINAL MM
thread_length16.0 MILLIMETERS NOMINAL MM
fastener_length30.0 MILLIMETERS NOMINAL MM
hardness_rating22.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
special_featuresGRADE 8
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_between_flats13.0 MILLIMETERS NOMINAL MM
end_item_identificationMRAP - UNIQUE NSN - USED ON 2 MRAP VARIANTS
nominal_thread_diameter8.0 MILLIMETERS MM
NSN5305-01-533-5235
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91280A538 · 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: 5.3 MILLIMETERS NOMINAL MM
•
FASTENER LENGTH: 30.0 MILLIMETERS NOMINAL MM
•
THREAD LENGTH: 16.0 MILLIMETERS NOMINAL MM
•
HARDNESS RATING: 22.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 8.0 MILLIMETERS MM
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 13.0 MILLIMETERS NOMINAL MM
TECHNICAL CHARACTERISTICS
HEAD HEIGHT5.3 MILLIMETERS NOMINAL MM
FASTENER LENGTH30.0 MILLIMETERS NOMINAL MM
THREAD LENGTH16.0 MILLIMETERS NOMINAL MM
HARDNESS RATING22.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER8.0 MILLIMETERS MM
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS13.0 MILLIMETERS NOMINAL MM
SPECIAL FEATURESGRADE 8
SURFACE TREATMENTZINC OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
38617Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91280A538?
91280A538 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 91280A538?
There is 1 known substitute for 91280A538: 38617. Substitute compatibility should be verified for your specific system.
What is the NSN for 91280A538?
91280A538 is cataloged in the U.S. Government catalog under NSN 5305-01-533-5235. 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.