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Technical Data Sheet
PartsTable / COMPONENT / MS27981-4B
MS27981-4B ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The STUD,SNAP FASTENER is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 260 OVERALL, surface_treatment: OXIDE FILM OVERALL, stud_base_diameter: 0.500 INCHES NOMINAL IN, stud_head_diameter: 0.281 INCHES NOMINAL IN, stud_overall_length: 0.941 INCHES NOMINAL IN, stud_retention_method: EYELET. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-901-9660, 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
MS27981-4B
NSN: 5325-00-901-9660
FSC: 5325
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialCOPPER ALLOY 260 OVERALL
surface_treatmentOXIDE FILM OVERALL
stud_base_diameter0.500 INCHES NOMINAL IN
stud_head_diameter0.281 INCHES NOMINAL IN
stud_overall_length0.941 INCHES NOMINAL IN
stud_retention_methodEYELET
snap_fastener_stud_styleSTUD
material_document_and_classificationQQ-B-613 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-50 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5325-00-901-9660
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS27981-4B · 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
•
SNAP FASTENER STUD STYLE: STUD
•
STUD BASE DIAMETER: 0.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-613 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-50 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: OXIDE FILM OVERALL
•
MATERIAL: COPPER ALLOY 260 OVERALL
•
STUD HEAD DIAMETER: 0.281 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SNAP FASTENER STUD STYLESTUD
STUD BASE DIAMETER0.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-495 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-50 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
SURFACE TREATMENTOXIDE FILM OVERALL
MATERIALCOPPER ALLOY 260 OVERALL
STUD HEAD DIAMETER0.281 INCHES NOMINAL IN
END ITEM IDENTIFICATIONW/S:AIRCRAFT, HAWKEYE E-2C; HELICOPTER, OBSERVATION (AHIP), 0H-58D; AIRCRAFT, PHANTOM F-4; RADAR, FIREFINDER, AN/TPQ-36 AND AN/TPQ-37; AIRCRAFT, B-2 BOMBER (ATB); HELICOPTER, KIOWA OH-58 A&C; AIRCRAFT, TOMCAT F-14; FMS-AIRCRAFT, HAWKEYE E-2C; AIRCRAFT, PROWLER EA-6B; AIRCRAFT, AIRLIFTER C-17A A
STUD RETENTION METHODEYELET
STUD OVERALL LENGTH0.941 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
J1508 TYPE B SIZE 79Interchangeable
interchangeable cross-reference
interchangeable
400 7057823 PCInterchangeable
interchangeable cross-reference
interchangeable
SAE-J1508Interchangeable
interchangeable cross-reference
interchangeable
11-1625Interchangeable
interchangeable cross-reference
interchangeable
1116-2-5AInterchangeable
interchangeable cross-reference
interchangeable
0257614AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS27981-4B?
MS27981-4B is a STUD,SNAP FASTENER.
What parts can replace MS27981-4B?
There are 11 known substitutes for MS27981-4B: J1508 TYPE B SIZE 79, 400 7057823 PC, SAE-J1508 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS27981-4B?
MS27981-4B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-901-9660. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026