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91274A179 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91274A179: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_height: 0.25 INCHES NOMINAL IN, head_length: 0.375 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.375 INCHES NOMINAL IN, thread_length: 0.75 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-663-7333, 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
91274A179
NSN: 5306-01-663-7333
FSC: 5306 — Bolts
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_height0.25 INCHES NOMINAL IN
head_length0.375 INCHES NOMINAL IN
thread_class3A A
head_diameter0.375 INCHES NOMINAL IN
thread_length0.75 INCHES NOMINAL IN
fastener_length0.75 INCHES NOMINAL IN
hardness_rating37.0 ROCKWELL C NOMINAL OVERALL
special_featuresFULLY THREADED;DRIVE SIZE 3/16";HEAD TYPE SOCKET;STANDARD SOCKET HEAD PROFILE;ASME B18.3;ASTM A574; ASTM B117;ROHS COMPLIANT
thread_directionRIGHT-HAND
width_across_flats0.188 INCHES NOMINAL IN
width_between_flats0.188 INCHES NOMINAL IN
NSN5306-01-663-7333
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91274A179 · 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
•
WIDTH ACROSS FLATS: 0.188 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.25 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.75 INCHES NOMINAL IN
•
THREAD LENGTH: 0.75 INCHES NOMINAL IN
•
HARDNESS RATING: 37.0 ROCKWELL C NOMINAL OVERALL
•
NOMINAL THREAD DIAMETER: 0.25 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD LENGTH: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.188 INCHES NOMINAL IN
HEAD HEIGHT0.25 INCHES NOMINAL IN
FASTENER LENGTH0.75 INCHES NOMINAL IN
THREAD LENGTH0.75 INCHES NOMINAL IN
HARDNESS RATING37.0 ROCKWELL C NOMINAL OVERALL
NOMINAL THREAD DIAMETER0.25 INCHES IN
THREAD DIRECTIONRIGHT-HAND
HEAD LENGTH0.375 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.188 INCHES NOMINAL IN
SPECIAL FEATURESFULLY THREADED;DRIVE SIZE 3/16";HEAD TYPE SOCKET;STANDARD SOCKET HEAD PROFILE;ASME B18.3;ASTM A574; ASTM B117;ROHS COMPLIANT
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91274A179?
91274A179 is a BOLT,INTERNAL WRENCHING.
What is the NSN for 91274A179?
91274A179 is cataloged in the U.S. Government catalog under NSN 5306-01-663-7333. 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.