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91770A581 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91770A581: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: TRUSS, head_height: 0.183 INCHES NOMINAL IN, head_diameter: 0.698 INCHES NOMINAL IN, thread_length: 0.75 INCHES NOMINAL IN, screw_material: STEEL COMP 304, fastener_length: 0.75 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-618-0532, 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
91770A581
NSN: 5305-01-618-0532
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_styleTRUSS
head_height0.183 INCHES NOMINAL IN
head_diameter0.698 INCHES NOMINAL IN
thread_length0.75 INCHES NOMINAL IN
screw_materialSTEEL COMP 304
fastener_length0.75 INCHES NOMINAL IN
special_featuresINTERNAL DRIVE STYLE IS TYPE 4 CROSS RECESS
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE III
end_item_identification7360-01-579-1956
nominal_thread_diameter0.3125 INCHES IN
thread_quantity_per_inch18
NSN5305-01-618-0532
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91770A581 · 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: 0.183 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.75 INCHES NOMINAL IN
•
THREAD LENGTH: 0.75 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
HEAD STYLE: TRUSS
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL COMP 304
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.183 INCHES NOMINAL IN
FASTENER LENGTH0.75 INCHES NOMINAL IN
THREAD LENGTH0.75 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.3125 INCHES IN
HEAD STYLETRUSS
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 304
SPECIAL FEATURESINTERNAL DRIVE STYLE IS TYPE 4 CROSS RECESS
INTERNAL DRIVE STYLECROSS RECESS TYPE III
END ITEM IDENTIFICATION7360-01-579-1956
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 91770A581?
91770A581 is a SCREW,MACHINE.
What is the NSN for 91770A581?
91770A581 is cataloged in the U.S. Government catalog under NSN 5305-01-618-0532. 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.