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Technical Data Sheet
PartsTable / COMPONENT / 5/16-18UNC-3AX3/8LG
5/16-18UNC-3AX3/8LG ✓ 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 5/16-18UNC-3AX3/8LG is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-682-5972, 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
5/16-18UNC-3AX3/8LG
NSN: 5305-00-682-5972
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number5/16-18UNC-3AX3/8LG
NSN5305-00-682-5972
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/16-18UNC-3AX3/8LG · 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: PASSIVATE OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL
•
THREAD QUANTITY PER INCH: 18
•
INTERNAL DRIVE STYLE: HEXAGON
•
HEAD STYLE: HEADLESS (SETSCREW)
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL
THREAD QUANTITY PER INCH18
INTERNAL DRIVE STYLEHEXAGON
HEAD STYLEHEADLESS (SETSCREW)
WIDTH ACROSS FLATS0.156 INCHES NOMINAL IN
POINT STYLECUP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
193067Interchangeable
interchangeable cross-reference
interchangeable
RC7158Interchangeable
interchangeable cross-reference
interchangeable
4912568-01Interchangeable
interchangeable cross-reference
interchangeable
8356Interchangeable
interchangeable cross-reference
interchangeable
364629Interchangeable
interchangeable cross-reference
interchangeable
2146004Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/16-18UNC-3AX3/8LG?
5/16-18UNC-3AX3/8LG is a 5/16-18UNC-3AX3/8LG.
What parts can replace 5/16-18UNC-3AX3/8LG?
There are 21 known substitutes for 5/16-18UNC-3AX3/8LG: 193067, RC7158, 4912568-01 and 18 more. Substitute compatibility should be verified for your specific system.
Is 5/16-18UNC-3AX3/8LG still available?
5/16-18UNC-3AX3/8LG 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