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PartsTable / COMPONENT / MS27977-21B
MS27977-21B ✓ 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 FASTENER,SNAP is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY STUD, body_length: 0.250 INCHES NOMINAL IN, plate_width: 0.812 INCHES NOMINAL IN, plate_length: 0.938 INCHES NOMINAL IN, socket_width: 0.750 INCHES NOMINAL IN, socket_length: 0.875 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-014-8438, 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
MS27977-21B
NSN: 5325-00-014-8438
FSC: 5325
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY STUD
body_length0.250 INCHES NOMINAL IN
plate_width0.812 INCHES NOMINAL IN
plate_length0.938 INCHES NOMINAL IN
socket_width0.750 INCHES NOMINAL IN
socket_length0.875 INCHES NOMINAL IN
stud_shank_length0.375 INCHES NOMINAL IN
socket_prong_length0.500 INCHES NOMINAL IN
stud_overall_length0.766 INCHES NOMINAL IN
plate_overall_height0.062 INCHES NOMINAL IN
socket_overall_height0.375 INCHES NOMINAL IN
stud_retention_methodSCREW BASE
NSN5325-00-014-8438
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS27977-21B · 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
•
STUD OVERALL LENGTH: 0.766 INCHES NOMINAL IN
•
SOCKET OVERALL HEIGHT: 0.375 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY SOCKET
•
SNAP FASTENER CLINCH PLATE STYLE: CLINCH PLATE
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.190-32 UNF
•
SNAP FASTENER STUD STYLE: STUD
•
BODY LENGTH: 0.250 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 1 STYLE
TECHNICAL CHARACTERISTICS (FLIS)
STUD OVERALL LENGTH0.766 INCHES NOMINAL IN
SOCKET OVERALL HEIGHT0.375 INCHES NOMINAL IN
MATERIALCOPPER ALLOY SOCKET
SNAP FASTENER CLINCH PLATE STYLECLINCH PLATE
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.190-32 UNF
SNAP FASTENER STUD STYLESTUD
BODY LENGTH0.250 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA1 STYLE
SOCKET LENGTH0.875 INCHES NOMINAL IN
SOCKET PRONG LENGTH0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
5325PL0727354Interchangeable
interchangeable cross-reference
interchangeable
MS27980-7BInterchangeable
interchangeable cross-reference
interchangeable
NASM27983Interchangeable
interchangeable cross-reference
interchangeable
MS27983Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-10884Interchangeable
interchangeable cross-reference
interchangeable
MILF10884Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS27977-21B?
MS27977-21B is a FASTENER,SNAP.
What parts can replace MS27977-21B?
There are 9 known substitutes for MS27977-21B: 5325PL0727354, MS27980-7B, NASM27983 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS27977-21B?
MS27977-21B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-014-8438. 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