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91257A595 — SCREW,CAP,HEXAGON HEAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91257A595: SCREW,CAP,HEXAGON HEAD.

The SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include head_style: UNDERCUT HEXAGON, head_height: 0.2188 INCHES NOMINAL IN, thread_length: 0.8750 INCHES MINIMUM AND 1.1875 INCHES MAXIMUM IN, fastener_length: 3.00 INCHES NOMINAL IN, special_features: PACKAGE QUANTITY:25, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-644-9832, 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
91257A595
NSN: 5305-01-644-9832
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_styleUNDERCUT HEXAGON
head_height0.2188 INCHES NOMINAL IN
thread_length0.8750 INCHES MINIMUM AND 1.1875 INCHES MAXIMUM IN
fastener_length3.00 INCHES NOMINAL IN
special_featuresPACKAGE QUANTITY:25
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_between_flats0.5 INCHES NOMINAL IN
nominal_thread_diameter0.3125 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencyHIGH-STRENGTH GRADE 8 STEEL CAP SCREW
NSN5305-01-644-9832
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91257A595 · 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: 0.2188 INCHES NOMINAL IN
•
FASTENER LENGTH: 3.00 INCHES NOMINAL IN
•
THREAD LENGTH: 0.8750 INCHES MINIMUM AND 1.1875 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
HEAD STYLE: UNDERCUT HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.5 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.2188 INCHES NOMINAL IN
FASTENER LENGTH3.00 INCHES NOMINAL IN
THREAD LENGTH0.8750 INCHES MINIMUM AND 1.1875 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.3125 INCHES IN
HEAD STYLEUNDERCUT HEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.5 INCHES NOMINAL IN
SPECIAL FEATURESPACKAGE QUANTITY:25
SURFACE TREATMENTZINC OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYHIGH-STRENGTH GRADE 8 STEEL CAP SCREW
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91257A595?
91257A595 is a SCREW,CAP,HEXAGON HEAD.
What is the NSN for 91257A595?
91257A595 is cataloged in the U.S. Government catalog under NSN 5305-01-644-9832. 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.