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AS51989 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AS51989: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660, thread_class: 3A STUD THREAD A, thread_length: 0.975 INCHES MINIMUM AND 1.005 INCHES MAXIMUM STUD THREAD IN, overall_length: 4.370 INCHES NOMINAL IN, locking_feature: RING, LOCK SERRATED, style_designator: LOCKED IN. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-032-0643, 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
AS51989
NSN: 5307-01-032-0643
NIINs: 010320643, 014139423
FSC: 5307 — Studs
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialIRON ALLOY 660
thread_class3A STUD THREAD A
thread_length0.975 INCHES MINIMUM AND 1.005 INCHES MAXIMUM STUD THREAD IN
overall_length4.370 INCHES NOMINAL IN
locking_featureRING, LOCK SERRATED
style_designatorLOCKED IN
thread_directionRIGHT-HAND STUD THREAD
nominal_thread_size0.750 INCHES NUT THREAD IN
thread_quantity_per_inch16 NUT THREAD
thread_series_designatorUNF NUT THREAD
material_document_and_classificationAMS 5734 ASSN STD SINGLE MATERIAL RESPONSE
distance_from_serrated_portion_to_nut_end3.045 INCHES MINIMUM AND 3.075 INCHES MAXIMUM IN
NSN5307-01-032-0643
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AS51989 · 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: 0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.505 INCHES MINIMUM AND 0.535 INCHES MAXIMUM STUD THREAD IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM
•
STYLE DESIGNATOR: LOCKED IN
•
THREAD PITCH DIAMETERS: +0.3926 TO 0.3946 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 END0.860 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
THREAD LENGTH0.505 INCHES MINIMUM AND 0.535 INCHES MAXIMUM STUD THREAD IN
THREAD LENGTH0.605 INCHES MINIMUM AND 0.635 INCHES MAXIMUM NUT THREAD IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM
STYLE DESIGNATORLOCKED IN
THREAD PITCH DIAMETERS+0.3926 TO 0.3946 INCHES STUD THREAD IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.595 INCHES MINIMUM AND 1.655 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
MS51989-107-14Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 AS51989?
AS51989 is a STUD,LOCKED IN.
What parts can replace AS51989?
There is 1 known substitute for AS51989: MS51989-107-14. Substitute compatibility should be verified for your specific system.
What is the NSN for AS51989?
AS51989 is cataloged in the U.S. Government catalog under NSN 5307-01-032-0643. This indicates validated use in U.S. government and defense supply chains.
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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.