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Technical Data Sheet
PartsTable / COMPONENT / MS17731-3A
MS17731-3A ✓ 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 ASSEMBLY,TURNLOCK is a the manufacturer industrial component. Key specifications include diameter: 0.525 INCHES NOMINAL IN, drive_type: CROSS RECESS, grip_length: 0.800 INCHES MAXIMUM IN, mounting_style: PLAIN W/MOUNTING HOLE, receptacle_width: 0.625 INCHES MAXIMUM IN, receptacle_height: 0.625 INCHES MAXIMUM 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 5325-00-478-3318, 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
MS17731-3A
NSN: 5325-00-478-3318
FSC: 5325
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
diameter0.525 INCHES NOMINAL IN
drive_typeCROSS RECESS
grip_length0.800 INCHES MAXIMUM IN
mounting_stylePLAIN W/MOUNTING HOLE
receptacle_width0.625 INCHES MAXIMUM IN
receptacle_height0.625 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
turnlock_stud_head_styleFLAT COUNTERSUNK
receptacle_overall_length1.135 INCHES MAXIMUM IN
stud_shank_major_diameter0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
turnlock_receptacle_styleRECEPTACLE
turnlock_stud_shank_styleSTUD SHANK
NSN5325-00-478-3318
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS17731-3A · 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
•
RECEPTACLE WIDTH: 0.625 INCHES MAXIMUM IN
•
MOUNTING STYLE: PLAIN W/MOUNTING HOLE
•
GRIP LENGTH: 0.800 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
TURNLOCK MOUNTING HOLE DIAMETER: 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2 CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STUD SHANK MAJOR DIAMETER: 0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
RECEPTACLE WIDTH0.625 INCHES MAXIMUM IN
MOUNTING STYLEPLAIN W/MOUNTING HOLE
GRIP LENGTH0.800 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
TURNLOCK MOUNTING HOLE DIAMETER0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2 CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STUD SHANK MAJOR DIAMETER0.373 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
TURNLOCK STUD SHANK STYLESTUD SHANK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
80S01-5-1AAInterchangeable
interchangeable cross-reference
interchangeable
MS17731-5Interchangeable
interchangeable cross-reference
interchangeable
MIL-F-22978Interchangeable
interchangeable cross-reference
interchangeable
8-02-00-3Interchangeable
interchangeable cross-reference
interchangeable
FX10-1556-3PInterchangeable
interchangeable cross-reference
interchangeable
8-02-00-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS17731-3A?
MS17731-3A is a FASTENER ASSEMBLY,TURNLOCK.
What parts can replace MS17731-3A?
There are 25 known substitutes for MS17731-3A: 80S01-5-1AA, MS17731-5, MIL-F-22978 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS17731-3A?
MS17731-3A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-478-3318. 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