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S1K-3 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

S1K-3: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: STEEL, thread_class: 3A NUT THREAD A, thread_length: 0.688 INCHES NOMINAL STUD THREAD IN, thread_direction: RIGHT-HAND NUT THREAD, surface_treatment: CADMIUM OVERALL, nominal_thread_size: 0.438 INCHES STUD THREAD IN. This part is cataloged in the U.S.

Government catalog under NSN 5307-00-944-6080, 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
S1K-3
NSN: 5307-00-944-6080
FSC: 5307 — Studs
CAGE: 29372 — HOWMET GLOBAL FASTENING SYSTEMS INC. DIV TRIDAIR PRODUCTS (USA)
SPECIFICATIONS
materialSTEEL
thread_class3A NUT THREAD A
thread_length0.688 INCHES NOMINAL STUD THREAD IN
thread_directionRIGHT-HAND NUT THREAD
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.438 INCHES STUD THREAD IN
thread_quantity_per_inch20 STUD THREAD
thread_series_designatorUNF STUD THREAD
NSN5307-00-944-6080
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: S1K-3 · 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
•
THREAD LENGTH: 0.688 INCHES NOMINAL NUT THREAD IN
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
NOMINAL THREAD SIZE: 0.438 INCHES STUD THREAD IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
THREAD CLASS: 2A STUD THREAD A
TECHNICAL CHARACTERISTICS
THREAD LENGTH0.688 INCHES NOMINAL NUT THREAD IN
THREAD LENGTH0.688 INCHES NOMINAL STUD THREAD IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD DIRECTIONRIGHT-HAND NUT THREAD
NOMINAL THREAD SIZE0.438 INCHES STUD THREAD IN
SURFACE TREATMENTCADMIUM OVERALL
THREAD CLASS2A STUD THREAD A
THREAD CLASS3A NUT THREAD A
THREAD QUANTITY PER INCH20 STUD THREAD
MATERIALSTEEL
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 1
SIK3Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 S1K-3?
S1K-3 is a STUD,LOCKED IN.
What parts can replace S1K-3?
There is 1 known substitute for S1K-3: SIK3. Substitute compatibility should be verified for your specific system.
What is the NSN for S1K-3?
S1K-3 is cataloged in the U.S. Government catalog under NSN 5307-00-944-6080. 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.