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91500A581 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91500A581: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK UNDERCUT, head_height: 0.191 INCHES NOMINAL IN, head_diameter: 0.597 INCHES NOMINAL IN, thread_length: 0.559 INCHES NOMINAL IN, screw_material: STEEL COMP 316, fastener_length: 0.75 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-656-4807, 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
91500A581
NSN: 5305-01-656-4807
FSC: 5305 — Screws
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK UNDERCUT
head_height0.191 INCHES NOMINAL IN
head_diameter0.597 INCHES NOMINAL IN
thread_length0.559 INCHES NOMINAL IN
screw_materialSTEEL COMP 316
fastener_length0.75 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
internal_drive_styleCROSS RECESS TYPE 1
end_item_identificationMRAP - MAXXPRO DASH MSU W/OGPK & W/CROWS
nominal_thread_diameter0.3125 INCHES IN
thread_quantity_per_inch18
NSN5305-01-656-4807
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91500A581 · 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: 0.75 INCHES NOMINAL IN
•
THREAD LENGTH: 0.559 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.3125 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL COMP 316
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.191 INCHES NOMINAL IN
FASTENER LENGTH0.75 INCHES NOMINAL IN
THREAD LENGTH0.559 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.3125 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 316
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
COUNTERSINK ANGLE82.0 DEGREES NOMINAL
PART NAME ASSIGNED BY CONTROLLING AGENCYTYPE 316 STAINLESS STEEL FLAT HEAD PHILLIPS MACHINE SCREW 5/16" - 18 THREAD, 3/4" LENGTH
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 1
B18.6.3Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 91500A581?
91500A581 is a SCREW,MACHINE.
What parts can replace 91500A581?
There is 1 known substitute for 91500A581: B18.6.3. Substitute compatibility should be verified for your specific system.
What is the NSN for 91500A581?
91500A581 is cataloged in the U.S. Government catalog under NSN 5305-01-656-4807. 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.