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91857A540 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

91857A540: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: ROUND, head_height: 0.175 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.472 INCHES NOMINAL IN, thread_length: 0.750 INCHES NOMINAL IN, screw_material: STEEL COMP 316. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-643-0580, 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
91857A540
NSN: 5305-01-643-0580
FSC: 5305 — Screws
CAGE: 0KVE6 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
head_styleROUND
head_height0.175 INCHES NOMINAL IN
thread_class2A A
head_diameter0.472 INCHES NOMINAL IN
thread_length0.750 INCHES NOMINAL IN
screw_materialSTEEL COMP 316
fastener_length0.750 INCHES NOMINAL IN
special_featuresOEM STAR STAINLESS SCREW; UNKNOWN CAGE; PART NUMBER:2-SRM-25C-75
thread_directionRIGHT-HAND
internal_drive_styleSLOT
end_item_identification3895-01-599-9380
nominal_thread_diameter0.250 INCHES IN
NSN5305-01-643-0580
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91857A540 · 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: 0.175 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.750 INCHES NOMINAL IN
•
THREAD LENGTH: 0.750 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: ROUND
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: STEEL COMP 316
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.175 INCHES NOMINAL IN
FASTENER LENGTH0.750 INCHES NOMINAL IN
THREAD LENGTH0.750 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEROUND
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 316
SPECIAL FEATURESOEM STAR STAINLESS SCREW; UNKNOWN CAGE; PART NUMBER:2-SRM-25C-75
INTERNAL DRIVE STYLESLOT
PART NAME ASSIGNED BY CONTROLLING AGENCYROUND HEAD SLOTTED MACHINE SCREW
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 91857A540?
91857A540 is a SCREW,MACHINE.
What is the NSN for 91857A540?
91857A540 is cataloged in the U.S. Government catalog under NSN 5305-01-643-0580. 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.