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Technical Data Sheet
PartsTable / COMPONENT / 5/8-18UNF-2AX1"LG,HHCS,CRES316
5/8-18UNF-2AX1"LG,HHCS,CRES316 ✓ 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 5/8-18UNF-2AX1"LG,HHCS,CRES316 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-449-7422, 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
5/8-18UNF-2AX1"LG,HHCS,CRES316
NSN: 5305-01-449-7422
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part Number5/8-18UNF-2AX1"LG,HHCS,CRES316
NSN5305-01-449-7422
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-18UNF-2AX1"LG,HHCS,CRES316 · 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
•
WIDTH BETWEEN FLATS: 0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 18
•
THREAD DIRECTION: RIGHT-HAND
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY MATERIAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED-STD66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
THREAD SERIES DESIGNATOR: UNF
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS0.922 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH18
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY MATERIAL
MATERIAL DOCUMENT AND CLASSIFICATIONFED-STD66 FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL COMP 316 OVERALL
HARDNESS RATING80.0 ROCKWELL B MINIMUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
MS35308-458Interchangeable
interchangeable cross-reference
interchangeable
S-190Interchangeable
interchangeable cross-reference
interchangeable
MS35308-458 CRE S 304 ONLYInterchangeable
interchangeable cross-reference
interchangeable
MS35308-458 CRE S 316 ONLYInterchangeable
Same NIIN cross-reference
interchangeable
FF-S-85Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/8-18UNF-2AX1"LG,HHCS,CRES316?
5/8-18UNF-2AX1"LG,HHCS,CRES316 is a 5/8-18UNF-2AX1"LG,HHCS,CRES316.
What parts can replace 5/8-18UNF-2AX1"LG,HHCS,CRES316?
There are 5 known substitutes for 5/8-18UNF-2AX1"LG,HHCS,CRES316: MS35308-458, S-190, MS35308-458 CRE S 304 ONLY and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/8-18UNF-2AX1"LG,HHCS,CRES316?
5/8-18UNF-2AX1"LG,HHCS,CRES316 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-449-7422. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026