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91771A559 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91771A559: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include screw_material: STEEL, fastener_length: 0.750 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, end_item_identification: 5895-01-545-4959 TERMINAL MOUNTING KIT, nominal_thread_diameter: 0.250 INCHES IN, thread_series_designator: UNF. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-547-5243, 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
91771A559
NSN: 5305-01-547-5243
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
screw_materialSTEEL
fastener_length0.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
end_item_identification5895-01-545-4959 TERMINAL MOUNTING KIT
nominal_thread_diameter0.250 INCHES IN
thread_series_designatorUNF
NSN5305-01-547-5243
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91771A559 · 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
•
FASTENER LENGTH: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL
SPECIAL FEATURESFLAT HEAD PHILLIPS 18-8 STAINLESS STEEL WITH UNDERCUT HEAD-HEADIS UNDERCUT TO 70 PERCENT OF STANDARD HEIGHT, ALLOWING FOR MORE THREADING THANSTANDARD FLAT HEAD PHILLIPS MACHINE SCREWS. 0.250 - 28 NUMBER 3 DRIVE
END ITEM IDENTIFICATION5895-01-545-4959 TERMINAL MOUNTING KIT
THREAD SERIES DESIGNATORUNF
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91771A559?
91771A559 is a SCREW,MACHINE.
What is the NSN for 91771A559?
91771A559 is cataloged in the U.S. Government catalog under NSN 5305-01-547-5243. 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.