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91271A630 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91271A630: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.312 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.874 INCHES MINIMUM IN, fastener_length: 1.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-396-4307, 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
91271A630
NSN: 5306-01-396-4307
FSC: 5306 — Bolts
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.312 INCHES NOMINAL IN
thread_class3A A
thread_length0.874 INCHES MINIMUM IN
fastener_length1.750 INCHES NOMINAL IN
hardness_rating37.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
nominal_thread_diameter0.312 INCHES IN
extended_washer_diameter0.468 INCHES NOMINAL IN
minimum_tensile_strength170000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch32
NSN5306-01-396-4307
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91271A630 · 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: 1.750 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.468 INCHES NOMINAL IN
•
THREAD LENGTH: 0.874 INCHES MINIMUM IN
•
HARDNESS RATING: 37.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 0.312 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON EXTENDED WASHER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.312 INCHES NOMINAL IN
FASTENER LENGTH1.750 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.468 INCHES NOMINAL IN
THREAD LENGTH0.874 INCHES MINIMUM IN
HARDNESS RATING37.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.312 INCHES IN
HEAD STYLEDOUBLE HEXAGON EXTENDED WASHER
THREAD DIRECTIONRIGHT-HAND
MINIMUM TENSILE STRENGTH170000 POUNDS PER SQUARE INCH LBS
THREAD CLASS3A A
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
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 91271A630?
91271A630 is a BOLT,MACHINE.
What is the NSN for 91271A630?
91271A630 is cataloged in the U.S. Government catalog under NSN 5306-01-396-4307. 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.