PartsTable
Technical Data Sheet
Download PDF

STBF34K4C4N — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

STBF34K4C4N: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN, material: STEEL COMP 4140 OR STEEL COMP 8740 OVERALL, drive_type: SOCKET, grip_length: 0.361 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN, minor_diameter: 0.221 INCHES NOMINAL IN, extension_length: 0.210 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-028-6025, 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
STBF34K4C4N
NSN: 5325-01-028-6025
FSC: 5325 — Fastening Devices
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
diameter0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN
materialSTEEL COMP 4140 OR STEEL COMP 8740 OVERALL
drive_typeSOCKET
grip_length0.361 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN
minor_diameter0.221 INCHES NOMINAL IN
extension_length0.210 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
securing_device_typeRING
turnlock_stud_head_styleFLAT COUNTERSUNK
stud_shank_major_diameter0.2470 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_document_and_classificationMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
NSN5325-01-028-6025
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: STBF34K4C4N · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-B-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DRIVE TYPE: SOCKET
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
EXTENSION LENGTH: 0.210 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN
•
SECURING DEVICE TYPE: RING
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-B-416,TYPE 2,CLASS 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DRIVE TYPESOCKET
TURNLOCK STUD SHANK STYLESTUD SHANK
EXTENSION LENGTH0.210 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
DIAMETER0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN
SECURING DEVICE TYPERING
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
STUD SHANK MAJOR DIAMETER0.2470 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy STBF34K4C4N?
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 STBF34K4C4N?
STBF34K4C4N is a STUD,TURNLOCK FASTENER.
What is the NSN for STBF34K4C4N?
STBF34K4C4N is cataloged in the U.S. Government catalog under NSN 5325-01-028-6025. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — STBF34K4C4N

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.