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271581 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

271581: 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: 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.031 INCHES NOMINAL IN, fastener_length: 1.172 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-242-1079, 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
271581
NSN: 5306-01-242-1079
NIINs: 012421079, 013414702
FSC: 5306 — Bolts
CAGE: 29510 — KOMATSU AMERICAN INTL CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM IN
thread_class2A A
thread_length1.031 INCHES NOMINAL IN
fastener_length1.172 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
width_between_flats0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
nominal_thread_diameter0.625 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNF
NSN5306-01-242-1079
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 271581 · 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
SUBSTITUTES & CROSS-REFERENCES 1
25329R1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 271581?
271581 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 271581?
There is 1 known substitute for 271581: 25329R1. Substitute compatibility should be verified for your specific system.
What is the NSN for 271581?
271581 is cataloged in the U.S. Government catalog under NSN 5306-01-242-1079. 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.