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LL51021-31 — SETSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

LL51021-31: SETSCREW.

The SETSCREW is a the manufacturer industrial component. Key specifications include thread_class: 3A A, thread_length: 3.175 MILLIMETERS NOMINAL MM, fastener_length: 4.763 MILLIMETERS NOMINAL MM, width_across_flats: 1.984 MILLIMETERS NOMINAL MM. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-052-3713, 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
LL51021-31
NSN: 5305-01-052-3713
FSC: 5305 — Screws
CAGE: 03038 — LONG-LOK, LLC (USA)
SPECIFICATIONS
thread_class3A A
thread_length3.175 MILLIMETERS NOMINAL MM
fastener_length4.763 MILLIMETERS NOMINAL MM
width_across_flats1.984 MILLIMETERS NOMINAL MM
NSN5305-01-052-3713
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: LL51021-31 · 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
•
WIDTH ACROSS FLATS: 1.984 MILLIMETERS NOMINAL MM
•
FASTENER LENGTH: 4.763 MILLIMETERS NOMINAL MM
•
THREAD LENGTH: 3.175 MILLIMETERS NOMINAL MM
•
THREAD CLASS: 3A A
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS1.984 MILLIMETERS NOMINAL MM
FASTENER LENGTH4.763 MILLIMETERS NOMINAL MM
THREAD LENGTH3.175 MILLIMETERS NOMINAL MM
THREAD CLASS3A A
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 3
5800765-9001-027Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
810138Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LL57XD82J3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is LL51021-31?
LL51021-31 is a SETSCREW.
What parts can replace LL51021-31?
There are 3 known substitutes for LL51021-31: 5800765-9001-027, 810138, LL57XD82J3. Substitute compatibility should be verified for your specific system.
What is the NSN for LL51021-31?
LL51021-31 is cataloged in the U.S. Government catalog under NSN 5305-01-052-3713. 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.