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458277 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

458277: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, head_style: HEXAGON, head_height: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.562 INCHES MAXIMUM IN, fastener_length: 0.562 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-997-1891, 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
458277
NSN: 5305-00-997-1891
FSC: 5305 — Screws
CAGE: 19139 — EASTMAN KODAK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
head_styleHEXAGON
head_height0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
thread_class2A A
thread_length0.562 INCHES MAXIMUM IN
fastener_length0.562 INCHES NOMINAL IN
special_featuresDRILLED AND TAPPED HOLE,1/4-20 IN. UNC CLASS 2B THREAD,ON LONGITUDINAL AXIS IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_between_flats0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch20
NSN5305-00-997-1891
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 458277 · 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: 0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.562 INCHES NOMINAL IN
•
THREAD LENGTH: 0.562 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.302 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN
FASTENER LENGTH0.562 INCHES NOMINAL IN
THREAD LENGTH0.562 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.736 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
SPECIAL FEATURESDRILLED AND TAPPED HOLE,1/4-20 IN. UNC CLASS 2B THREAD,ON LONGITUDINAL AXIS IN
SURFACE TREATMENTPASSIVATE OVERALL
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 2
FF-S-85CReference document
Same NSN cross-reference
Reference document — Secondary reference
FF-S-85Reference document
Same NSN cross-reference
Reference document — Identification reference
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 458277?
458277 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 458277?
There are 2 known substitutes for 458277: FF-S-85C, FF-S-85. Substitute compatibility should be verified for your specific system.
What is the NSN for 458277?
458277 is cataloged in the U.S. Government catalog under NSN 5305-00-997-1891. 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.