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MS51992C643-11 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS51992C643-11: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660, thread_class: 3A NUT THREAD A, thread_length: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM NUT THREAD IN, overall_length: 1.211 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES STUD THD, locking_feature: RING, LOCK SERRATED. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-140-8863, 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
MS51992C643-11
NSN: 5307-01-140-8863
FSC: 5307 — Studs
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialIRON ALLOY 660
thread_class3A NUT THREAD A
thread_length0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM NUT THREAD IN
overall_length1.211 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES STUD THD
locking_featureRING, LOCK SERRATED
style_designatorLOCKED IN
thread_directionRIGHT-HAND NUT THREAD
serration_quantity17
nominal_thread_size0.250 INCHES NUT THREAD IN
thread_pitch_diameters+0.3497 TO 0.3512 INCHES STUD THREAD IN
serration_included_angle85.0 DEGREES MINIMUM AND 88.0 DEGREES MAXIMUM
NSN5307-01-140-8863
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51992C643-11 · 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
•
SURFACE FINISH: 63.0 MICROINCHES STUD THD
•
DISTANCE FROM SERRATED PORTION TO NUT END: 0.673 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM NUT THREAD IN
•
STYLE DESIGNATOR: LOCKED IN
•
THREAD PITCH DIAMETERS: +0.3497 TO 0.3512 INCHES STUD THREAD IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5734 ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES STUD THD
SURFACE FINISH32.0 MICROINCHES NUT THD
DISTANCE FROM SERRATED PORTION TO NUT END0.673 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
THREAD LENGTH0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM NUT THREAD IN
THREAD LENGTH0.381 INCHES MINIMUM AND 0.451 INCHES MAXIMUM STUD THREAD IN
STYLE DESIGNATORLOCKED IN
THREAD PITCH DIAMETERS+0.3497 TO 0.3512 INCHES STUD THREAD IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5734 ASSN STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.211 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN
DISTANCE FROM SERRATED PORTION TO END OF STUD THREAD0.127 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN
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
SF5902C643-11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10116426Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 MS51992C643-11?
MS51992C643-11 is a STUD,LOCKED IN.
What parts can replace MS51992C643-11?
There are 2 known substitutes for MS51992C643-11: SF5902C643-11, 10116426. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51992C643-11?
MS51992C643-11 is cataloged in the U.S. Government catalog under NSN 5307-01-140-8863. This indicates validated use in U.S. government and defense supply chains.
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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.