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91259A851 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91259A851: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_diameter: 1.0 INCHES NOMINAL IN, fastener_length: 4.475 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, shoulder_diameter: 0.625 INCHES NOMINAL FIRST SHOULDER IN, surface_treatment: OXIDE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-659-9957, 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
91259A851
NSN: 5305-01-659-9957
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_diameter1.0 INCHES NOMINAL IN
fastener_length4.475 INCHES NOMINAL IN
thread_directionRIGHT-HAND
shoulder_diameter0.625 INCHES NOMINAL FIRST SHOULDER IN
surface_treatmentOXIDE OVERALL
width_across_flats0.375 INCHES NOMINAL IN
end_item_identificationKC-46A SE A
nominal_thread_diameter0.625 INCHES IN
thread_quantity_per_inch13
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencyBOLT,SHOULDER
NSN5305-01-659-9957
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91259A851 · 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: 0.375 INCHES NOMINAL IN
•
FASTENER LENGTH: 4.475 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 0.625 INCHES NOMINAL FIRST SHOULDER IN
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
COLOR: BLACK OVERALL
•
SURFACE TREATMENT: OXIDE OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
FASTENER LENGTH4.475 INCHES NOMINAL IN
SHOULDER DIAMETER0.625 INCHES NOMINAL FIRST SHOULDER IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
THREAD DIRECTIONRIGHT-HAND
COLORBLACK OVERALL
SURFACE TREATMENTOXIDE OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYBOLT,SHOULDER
END ITEM IDENTIFICATIONKC-46A SE A
THREAD QUANTITY PER INCH13
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 91259A851?
91259A851 is a SCREW,SHOULDER.
What is the NSN for 91259A851?
91259A851 is cataloged in the U.S. Government catalog under NSN 5305-01-659-9957. 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.