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91257A879 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91257A879: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, head_height: 0.468 INCHES NOMINAL IN, thread_length: 1.75 INCHES MINIMUM AND 2.25 INCHES MAXIMUM IN, fastener_length: 4.5 INCHES NOMINAL IN, special_features: OEM IS INFASCO DISTRIBUTION, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-620-5879, 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
91257A879
NSN: 5305-01-620-5879
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_styleHEXAGON
head_height0.468 INCHES NOMINAL IN
thread_length1.75 INCHES MINIMUM AND 2.25 INCHES MAXIMUM IN
fastener_length4.5 INCHES NOMINAL IN
special_featuresOEM IS INFASCO DISTRIBUTION
thread_directionRIGHT-HAND
width_between_flats1.125 INCHES NOMINAL IN
nominal_thread_diameter0.75 INCHES IN
thread_quantity_per_inch16
thread_series_designatorUNF
nonstandard_thread_pitch_diameter-0.06250 TO 0.06251 INCHES IN
NSN5305-01-620-5879
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91257A879 · 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: 0.468 INCHES NOMINAL IN
•
FASTENER LENGTH: 4.5 INCHES NOMINAL IN
•
THREAD LENGTH: 1.75 INCHES MINIMUM AND 2.25 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.75 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 1.125 INCHES NOMINAL IN
•
NONSTANDARD THREAD PITCH DIAMETER: -0.06250 TO 0.06251 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.468 INCHES NOMINAL IN
FASTENER LENGTH4.5 INCHES NOMINAL IN
THREAD LENGTH1.75 INCHES MINIMUM AND 2.25 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.75 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS1.125 INCHES NOMINAL IN
NONSTANDARD THREAD PITCH DIAMETER-0.06250 TO 0.06251 INCHES IN
SPECIAL FEATURESOEM IS INFASCO DISTRIBUTION
THREAD QUANTITY PER INCH16
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
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 91257A879?
91257A879 is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for 91257A879?
91257A879 is cataloged in the U.S. Government catalog under NSN 5305-01-620-5879. 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.