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S257-7-8L9 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

S257-7-8L9: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1330, thread_class: 3A STUD THREAD A, nominal_thread_size: 0.312 INCHES STUD THREAD IN, end_item_identification: TF33P3/103ENG, thread_series_designator: UNF STUD THREAD. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-512-9158, 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
S257-7-8L9
NSN: 5307-01-512-9158
FSC: 5307 — Studs
CAGE: 01556 — STANLEY ENGINEERED FASTENING LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1330
thread_class3A STUD THREAD A
nominal_thread_size0.312 INCHES STUD THREAD IN
end_item_identificationTF33P3/103ENG
thread_series_designatorUNF STUD THREAD
NSN5307-01-512-9158
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S257-7-8L9 · 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
•
NOMINAL THREAD SIZE: 0.312 INCHES STUD THREAD IN
•
THREAD CLASS: 3A STUD THREAD A
•
MATERIAL: STEEL COMP 1330
•
THREAD SERIES DESIGNATOR: UNF STUD THREAD
TECHNICAL CHARACTERISTICS
NOMINAL THREAD SIZE0.312 INCHES STUD THREAD IN
THREAD CLASS3A STUD THREAD A
END ITEM IDENTIFICATIONTF33P3/103ENG
MATERIALSTEEL COMP 1330
THREAD SERIES DESIGNATORUNF STUD THREAD
OTHER ITEMS IN FSC 5307 — Studs
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5307-00-000-6436 5307-00-001-1578 5307-00-001-1761 5307-00-001-2366 5307-00-001-4491 5307-00-001-4624 5307-00-001-4625
SUBSTITUTES & CROSS-REFERENCES 2
HSSCD6982-18-9Reference document
Same NSN cross-reference
Reference document — Secondary reference
69823-18-9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 S257-7-8L9?
S257-7-8L9 is a STUD,LOCKED IN.
What parts can replace S257-7-8L9?
There are 2 known substitutes for S257-7-8L9: HSSCD6982-18-9, 69823-18-9. Substitute compatibility should be verified for your specific system.
What is the NSN for S257-7-8L9?
S257-7-8L9 is cataloged in the U.S. Government catalog under NSN 5307-01-512-9158. 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.