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Technical Data Sheet
PartsTable / COMPONENT / SS399-1-20-A
SS399-1-20-A ✓ 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 5325-00-639-2623, 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
SS399-1-20-A
NSN: 5325-00-639-2623
FSC: 5325
CAGE: 98437 — ELLIS & WATTS INTERNATIONAL, LLC (USA)
SPECIFICATIONS
Part NumberSS399-1-20-A
NSN5325-00-639-2623
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SS399-1-20-A · 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 14
MP34V4Interchangeable
interchangeable cross-reference
interchangeable
8908998Interchangeable
interchangeable cross-reference
interchangeable
GGG-L-211Interchangeable
interchangeable cross-reference
interchangeable
2N3707Interchangeable
interchangeable cross-reference
interchangeable
50440Interchangeable
interchangeable cross-reference
interchangeable
201C500Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SS399-1-20-A?
SS399-1-20-A is a STUD,TURNLOCK FASTENER.
What parts can replace SS399-1-20-A?
There are 14 known substitutes for SS399-1-20-A: MP34V4, 8908998, GGG-L-211 and 11 more. Substitute compatibility should be verified for your specific system.
Is SS399-1-20-A still available?
SS399-1-20-A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026