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Technical Data Sheet
PartsTable / COMPONENT / MIL-F-25173A
MIL-F-25173A ✓ 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

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.279 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN, material: STEEL STUD, eyelet_length: 0.108 INCHES MINIMUM AND 0.112 INCHES MAXIMUM IN, stud_diameter: 0.213 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, stud_assembly_style: STUD ASSEMBLY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-477-4823, 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
MIL-F-25173A
NSN: 5325-01-477-4823
FSC: 5325
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
diameter0.279 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
materialSTEEL STUD
eyelet_length0.108 INCHES MINIMUM AND 0.112 INCHES MAXIMUM IN
stud_diameter0.213 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT FILLISTER
specification/standard_data81349-MIL-F-25173/INACTIVE PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
surface_treatment_document_and_classificationQQ-P-416, TY I, CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5325-01-477-4823
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-F-25173A · 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 ASSEMBLY STYLE: STUD ASSEMBLY
•
DIAMETER: 0.279 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
•
EYELET LENGTH: 0.108 INCHES MINIMUM AND 0.112 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FLAT FILLISTER
•
MATERIAL: STEEL EJECTOR SPRING
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-25173/INACTIVE PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STUD ASSEMBLY STYLESTUD ASSEMBLY
DIAMETER0.279 INCHES MINIMUM AND 0.283 INCHES MAXIMUM IN
EYELET LENGTH0.108 INCHES MINIMUM AND 0.112 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFLAT FILLISTER
MATERIALSTEEL EJECTOR SPRING
SPECIFICATION/STANDARD DATA81349-MIL-F-25173/INACTIVE PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL STUD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TY I, CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EYELET OUTSIDE DIAMETER0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
X-1431Interchangeable
interchangeable cross-reference
interchangeable
5950PL0916717Interchangeable
interchangeable cross-reference
interchangeable
3506-SC47CP4-BOCInterchangeable
Same NIIN cross-reference
interchangeable
PFSC35-47CP4RBInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-F-25173A?
MIL-F-25173A is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace MIL-F-25173A?
There are 4 known substitutes for MIL-F-25173A: X-1431, 5950PL0916717, 3506-SC47CP4-BOC and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-F-25173A?
MIL-F-25173A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-477-4823. 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