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Technical Data Sheet
PartsTable / COMPONENT / BS-78403
BS-78403 ✓ 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 SOCKET,TURNBUTTON FASTENER is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, socket_hole_width: 0.344 INCHES NOMINAL IN, socket_hole_length: 0.578 INCHES NOMINAL IN, socket_overall_width: 0.828 INCHES NOMINAL IN, socket_overall_length: 1.062 INCHES NOMINAL IN, turnbutton_socket_style: SOCKET. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-281-8643, 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
BS-78403
NSN: 5325-00-281-8643
FSC: 5325
CAGE: 61864 — TRW ASSEMBLIES AND FASTENERS GROUP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
socket_hole_width0.344 INCHES NOMINAL IN
socket_hole_length0.578 INCHES NOMINAL IN
socket_overall_width0.828 INCHES NOMINAL IN
socket_overall_length1.062 INCHES NOMINAL IN
turnbutton_socket_styleSOCKET
turnbutton_overall_height0.312 INCHES NOMINAL IN
NSN5325-00-281-8643
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BS-78403 · 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
•
SOCKET OVERALL LENGTH: 1.062 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
TURNBUTTON SOCKET STYLE: SOCKET
•
TURNBUTTON OVERALL HEIGHT: 0.312 INCHES NOMINAL IN
•
SOCKET OVERALL WIDTH: 0.828 INCHES NOMINAL IN
•
SOCKET HOLE WIDTH: 0.344 INCHES NOMINAL IN
•
SOCKET HOLE LENGTH: 0.578 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SOCKET OVERALL LENGTH1.062 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
TURNBUTTON SOCKET STYLESOCKET
TURNBUTTON OVERALL HEIGHT0.312 INCHES NOMINAL IN
SOCKET OVERALL WIDTH0.828 INCHES NOMINAL IN
SOCKET HOLE WIDTH0.344 INCHES NOMINAL IN
SOCKET HOLE LENGTH0.578 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
78-403Interchangeable
interchangeable cross-reference
interchangeable
GGG-C-406 TY1CLAInterchangeable
interchangeable cross-reference
interchangeable
J403Interchangeable
interchangeable cross-reference
interchangeable
RC08-0001Interchangeable
interchangeable cross-reference
interchangeable
D78403Interchangeable
interchangeable cross-reference
interchangeable
784030.G.Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BS-78403?
BS-78403 is a SOCKET,TURNBUTTON FASTENER.
What parts can replace BS-78403?
There are 11 known substitutes for BS-78403: 78-403, GGG-C-406 TY1CLA, J403 and 8 more. Substitute compatibility should be verified for your specific system.
Is BS-78403 still available?
BS-78403 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