PartsTable
Technical Data Sheet
PartsTable / COMPONENT / SS399-A-21
SS399-A-21 ✓ 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,TURNLOCK FASTENER is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-720-6450, 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
SS399-A-21
NSN: 5325-00-720-6450
FSC: 5325
CAGE: 98437 — ELLIS & WATTS INTERNATIONAL, LLC (USA)
SPECIFICATIONS
Part NumberSS399-A-21
NSN5325-00-720-6450
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SS399-A-21 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
SC-B-70426Interchangeable
interchangeable cross-reference
interchangeable
50460Interchangeable
interchangeable cross-reference
interchangeable
50460AInterchangeable
interchangeable cross-reference
interchangeable
8460RInterchangeable
interchangeable cross-reference
interchangeable
D2AZ-8501-AInterchangeable
interchangeable cross-reference
interchangeable
PC347Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy SS399-A-21?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is SS399-A-21?
SS399-A-21 is a STUD,TURNLOCK FASTENER.
What parts can replace SS399-A-21?
There are 13 known substitutes for SS399-A-21: SC-B-70426, 50460, 50460A and 10 more. Substitute compatibility should be verified for your specific system.
Is SS399-A-21 still available?
SS399-A-21 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — SS399-A-21

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026