PartsTable
Technical Data Sheet
Download PDF

MS51989-105-20 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS51989-105-20: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130, thread_class: 3A NUT THREAD A, thread_length: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD IN, overall_length: 1.780 INCHES MINIMUM AND 1.840 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES NUT THD, hardness_rating: 26.0 ROCKWELL C MINIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5307-00-006-3215, 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
MS51989-105-20
NSN: 5307-00-006-3215
FSC: 5307 — Studs
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP 4130
thread_class3A NUT THREAD A
thread_length0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD IN
overall_length1.780 INCHES MINIMUM AND 1.840 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES NUT THD
hardness_rating26.0 ROCKWELL C MINIMUM
locking_featureRING, LOCK SERRATED
style_designatorLOCKED IN
thread_directionRIGHT-HAND NUT THREAD
surface_treatmentCADMIUM OVERALL
serration_quantity17
nominal_thread_size0.312 INCHES STUD THREAD IN
NSN5307-00-006-3215
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS51989-105-20 · 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: 32.0 MICROINCHES NUT THD
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DISTANCE FROM SERRATED PORTION TO NUT END: 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM
•
STYLE DESIGNATOR: LOCKED IN
•
THREAD PITCH DIAMETERS: +0.2778 TO 0.2795 INCHES STUD THREAD IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES NUT THD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DISTANCE FROM SERRATED PORTION TO NUT END1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN
THREAD LENGTH0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD IN
THREAD LENGTH0.375 INCHES MINIMUM AND 0.405 INCHES MAXIMUM STUD THREAD IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM
STYLE DESIGNATORLOCKED IN
THREAD PITCH DIAMETERS+0.2778 TO 0.2795 INCHES STUD THREAD IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.780 INCHES MINIMUM AND 1.840 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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy MS51989-105-20?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is MS51989-105-20?
MS51989-105-20 is a STUD,LOCKED IN.
What is the NSN for MS51989-105-20?
MS51989-105-20 is cataloged in the U.S. Government catalog under NSN 5307-00-006-3215. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — MS51989-105-20

✓ 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.