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91771A555 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91771A555: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include screw_material: STEEL, fastener_length: 0.268 INCHES NOMINAL IN, special_features: 18-8 STAINLESS STEEL WITH UNDERCUT HEAD;HEAD HEIGHT .107" WITH .477 BETWEEN FLATS AND 82 DEG HEAD, thread_direction: RIGHT-HAND, part_name_assigned_by_controlling_agency: FLAT HEAD PHILLIPS. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-559-7989, 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
91771A555
NSN: 5305-01-559-7989
FSC: 5305 — Screws
CAGE: 0KVE6 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
screw_materialSTEEL
fastener_length0.268 INCHES NOMINAL IN
special_features18-8 STAINLESS STEEL WITH UNDERCUT HEAD;HEAD HEIGHT .107" WITH .477 BETWEEN FLATS AND 82 DEG HEAD
thread_directionRIGHT-HAND
part_name_assigned_by_controlling_agencyFLAT HEAD PHILLIPS
NSN5305-01-559-7989
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91771A555 · 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: 0.268 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.268 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL
SPECIAL FEATURES18-8 STAINLESS STEEL WITH UNDERCUT HEAD;HEAD HEIGHT .107" WITH .477 BETWEEN FLATS AND 82 DEG HEAD
PART NAME ASSIGNED BY CONTROLLING AGENCYFLAT HEAD PHILLIPS
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91771A555?
91771A555 is a SCREW,MACHINE.
What is the NSN for 91771A555?
91771A555 is cataloged in the U.S. Government catalog under NSN 5305-01-559-7989. 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.