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PartsTable / COMPONENT / ASTM B18.6.3
ASTM B18.6.3 ✓ 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 ASTM B18.6.3 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-958-5250, 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
ASTM B18.6.3
NSN: 5305-00-958-5250
FSC: 5305
CAGE: 81346 — AMERICAN SOCIETY FOR TESTING AND MATERIALS DBA ASTM INTERNATIONAL (USA)
SPECIFICATIONS
Part NumberASTM B18.6.3
NSN5305-00-958-5250
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ASTM B18.6.3 · 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
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
MINIMUM TENSILE STRENGTH: 60000 POUNDS PER SQUARE INCH LBS
•
SCREW SURFACE TREATMENT: ZINC
•
THREAD CLASS: 2A A
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
SCREW MATERIAL: STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH20
NOMINAL THREAD DIAMETER0.250 INCHES IN
MINIMUM TENSILE STRENGTH60000 POUNDS PER SQUARE INCH LBS
SCREW SURFACE TREATMENTZINC
THREAD CLASS2A A
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
SCREW MATERIALSTEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1013
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH3.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
NASM35214Interchangeable
interchangeable cross-reference
interchangeable
5305PL0144760Interchangeable
interchangeable cross-reference
interchangeable
G0015246Interchangeable
interchangeable cross-reference
interchangeable
5305PL2228214Interchangeable
interchangeable cross-reference
interchangeable
ANSI B18.6.3Interchangeable
interchangeable cross-reference
interchangeable
FF-S-92Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ASTM B18.6.3?
ASTM B18.6.3 is a ASTM B18.6.3.
What parts can replace ASTM B18.6.3?
There are 19 known substitutes for ASTM B18.6.3: NASM35214, 5305PL0144760, G0015246 and 16 more. Substitute compatibility should be verified for your specific system.
Is ASTM B18.6.3 still available?
ASTM B18.6.3 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026