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881BW-5MD1250 — STUD,LOCKED IN

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

881BW-5MD1250: STUD,LOCKED IN.

The STUD,LOCKED IN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 AND STEEL COMP E4340, thread_class: 3A NUT THREAD A, thread_length: 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM NUT THREAD IN, overall_length: 1.812 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES OVERALL, locking_feature: RING, LOCK KEYED. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-010-6996, 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
881BW-5MD1250
NSN: 5307-01-010-6996
FSC: 5307 — Studs
CAGE: 01556 — STANLEY ENGINEERED FASTENING LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 AND STEEL COMP E4340
thread_class3A NUT THREAD A
thread_length0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM NUT THREAD IN
overall_length1.812 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES OVERALL
locking_featureRING, LOCK KEYED
shoulder_length0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
style_designatorLOCKED IN
thread_directionRIGHT-HAND STUD THREAD
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.312 INCHES NUT THREAD IN
thread_quantity_per_inch24 NUT THREAD
NSN5307-01-010-6996
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 881BW-5MD1250 · 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: 125.0 MICROINCHES OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM NUT THREAD IN
•
STYLE DESIGNATOR: LOCKED IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5000 MIL SPEC ALL MATERIAL RESPONSES
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
TECHNICAL CHARACTERISTICS
SURFACE FINISH125.0 MICROINCHES OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM NUT THREAD IN
THREAD LENGTH0.040 INCHES MINIMUM AND 0.050 INCHES MAXIMUM STUD THREAD IN
STYLE DESIGNATORLOCKED IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5000 MIL SPEC ALL MATERIAL RESPONSES
OVERALL LENGTH1.812 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD DIRECTIONRIGHT-HAND NUT THREAD
NOMINAL THREAD SIZE0.312 INCHES NUT THREAD 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
502AS3415-02Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
WS256-4-7-20AReference 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 881BW-5MD1250?
881BW-5MD1250 is a STUD,LOCKED IN.
What parts can replace 881BW-5MD1250?
There are 2 known substitutes for 881BW-5MD1250: 502AS3415-02, WS256-4-7-20A. Substitute compatibility should be verified for your specific system.
What is the NSN for 881BW-5MD1250?
881BW-5MD1250 is cataloged in the U.S. Government catalog under NSN 5307-01-010-6996. 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.