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PartsTable / COMPONENT / 5/16 INCH-18UNC-2AX1 1/4 INCH
5/16 INCH-18UNC-2AX1 1/4 INCH ✓ 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 INCH-18UNC-2AX1 1/4 INCH is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-637-9674, 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 INCH-18UNC-2AX1 1/4 INCH
NSN: 5306-00-637-9674
FSC: 5306
CAGE: 78509 — CARDINAL FASTENER & SPECIALTY CO (USA)
SPECIFICATIONS
Part Number5/16 INCH-18UNC-2AX1 1/4 INCH
NSN5306-00-637-9674
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/16 INCH-18UNC-2AX1 1/4 INCH · 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-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MINIMUM YIELD STRENGTH: 30000 POUNDS PER SQUARE INCH LBS
•
HARDNESS RATING: 80.0 ROCKWELL B MINIMUM OVERALL
•
MINIMUM TENSILE STRENGTH: 80000 POUNDS PER SQUARE INCH LBS
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
FASTENER LENGTH: 1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD HEIGHT: 0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MINIMUM YIELD STRENGTH30000 POUNDS PER SQUARE INCH LBS
HARDNESS RATING80.0 ROCKWELL B MINIMUM OVERALL
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH LBS
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
FASTENER LENGTH1.188 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD HEIGHT0.195 INCHES MINIMUM AND 0.211 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH18
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
43B21912-136Upgraded Successor
successor cross-reference
successor
MIL-DTL-1222Upgraded Successor
successor cross-reference
successor
5/16-18UNC-2AX1-1/4INLGTY1GR316Upgraded Successor
successor cross-reference
successor
MS35307-336Upgraded Successor
successor cross-reference
successor
14444Interchangeable
interchangeable cross-reference
interchangeable
28353Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/16 INCH-18UNC-2AX1 1/4 INCH?
5/16 INCH-18UNC-2AX1 1/4 INCH is a 5/16 INCH-18UNC-2AX1 1/4 INCH.
What parts can replace 5/16 INCH-18UNC-2AX1 1/4 INCH?
There are 17 known substitutes for 5/16 INCH-18UNC-2AX1 1/4 INCH: 43B21912-136, MIL-DTL-1222, 5/16-18UNC-2AX1-1/4INLGTY1GR316 and 14 more. Substitute compatibility should be verified for your specific system.
Is 5/16 INCH-18UNC-2AX1 1/4 INCH still available?
5/16 INCH-18UNC-2AX1 1/4 INCH 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