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91771A578 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91771A578: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_height: 0.191 INCHES NOMINAL IN, thread_length: 0.309 INCHES NOMINAL IN, fastener_length: 0.500 INCHES NOMINAL IN, thread_direction: RIGHT-HAND, countersink_angle: 82.0 DEGREES MINIMUM, internal_drive_style: CROSS RECESS TYPE 1. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-482-7616, 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
91771A578
NSN: 5305-01-482-7616
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_height0.191 INCHES NOMINAL IN
thread_length0.309 INCHES NOMINAL IN
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES MINIMUM
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.3125 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNF
NSN5305-01-482-7616
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91771A578 · 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: 0.191 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.309 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
COUNTERSINK ANGLE: 82.0 DEGREES MINIMUM
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.191 INCHES NOMINAL IN
FASTENER LENGTH0.500 INCHES NOMINAL IN
THREAD LENGTH0.309 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.3125 INCHES IN
THREAD DIRECTIONRIGHT-HAND
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
COUNTERSINK ANGLE82.0 DEGREES MINIMUM
THREAD QUANTITY PER INCH18
THREAD SERIES DESIGNATORUNF
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91771A578?
91771A578 is a SCREW,MACHINE.
What is the NSN for 91771A578?
91771A578 is cataloged in the U.S. Government catalog under NSN 5305-01-482-7616. 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.