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Technical Data Sheet
PartsTable / COMPONENT / SS399-12
SS399-12 ✓ 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. Key specifications include diameter: 0.362 INCHES NOMINAL IN, material: STEEL OVERALL, drive_type: SLOTTED, grip_length: 0.540 INCHES NOMINAL IN, shank_neck_length: 0.385 INCHES NOMINAL IN, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-944-7691, 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
SS399-12
NSN: 5325-00-944-7691
FSC: 5325
CAGE: 94222 — SOUTHCO INC (USA)
SPECIFICATIONS
diameter0.362 INCHES NOMINAL IN
materialSTEEL OVERALL
drive_typeSLOTTED
grip_length0.540 INCHES NOMINAL IN
shank_neck_length0.385 INCHES NOMINAL IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
securing_device_typeRING
turnlock_stud_head_styleFILLISTER
stud_shank_major_diameter0.290 INCHES NOMINAL IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.270 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5325-00-944-7691
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SS399-12 · 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
•
DIAMETER: 0.362 INCHES NOMINAL IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
•
DRIVE TYPE: SLOTTED
•
MATERIAL: STEEL OVERALL
•
STUD SHANK MAJOR DIAMETER: 0.290 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
GRIP LENGTH: 0.540 INCHES NOMINAL IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.362 INCHES NOMINAL IN
TURNLOCK STUD HEAD STYLEFILLISTER
DRIVE TYPESLOTTED
MATERIALSTEEL OVERALL
STUD SHANK MAJOR DIAMETER0.290 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
GRIP LENGTH0.540 INCHES NOMINAL IN
TURNLOCK STUD SHANK STYLESTUD SHANK
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SHANK NECK LENGTH0.385 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
5-0-280Interchangeable
interchangeable cross-reference
interchangeable
1071175Interchangeable
interchangeable cross-reference
interchangeable
721699-090Interchangeable
interchangeable cross-reference
interchangeable
85-11-280-16Interchangeable
interchangeable cross-reference
interchangeable
8549657-10Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SS399-12?
SS399-12 is a STUD,TURNLOCK FASTENER.
What parts can replace SS399-12?
There are 5 known substitutes for SS399-12: 5-0-280, 1071175, 721699-090 and 2 more. Substitute compatibility should be verified for your specific system.
Is SS399-12 still available?
SS399-12 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