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Technical Data Sheet
PartsTable / COMPONENT / SS399-A-9
SS399-A-9 ✓ 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 product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-107-0085, 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-9
NSN: 5325-01-107-0085
FSC: 5325
CAGE: 98437 — ELLIS & WATTS INTERNATIONAL, LLC (USA)
SPECIFICATIONS
Part NumberSS399-A-9
NSN5325-01-107-0085
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SS399-A-9 · 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 15
502-20Interchangeable
interchangeable cross-reference
interchangeable
502-0020Interchangeable
interchangeable cross-reference
interchangeable
50220BInterchangeable
interchangeable cross-reference
interchangeable
PCH2020Interchangeable
interchangeable cross-reference
interchangeable
5-0-220AInterchangeable
interchangeable cross-reference
interchangeable
569404Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SS399-A-9?
SS399-A-9 is a STUD,TURNLOCK FASTENER.
What parts can replace SS399-A-9?
There are 15 known substitutes for SS399-A-9: 502-20, 502-0020, 50220B and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SS399-A-9?
SS399-A-9 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-107-0085. 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