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Technical Data Sheet
PartsTable / COMPONENT / 5/8-11UNC-3A X3 1/4 INCHES
5/8-11UNC-3A X3 1/4 INCHES ✓ 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 5/8-11UNC-3A X3 1/4 INCHES is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-306-7534, 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
5/8-11UNC-3A X3 1/4 INCHES
NSN: 5307-01-306-7534
FSC: 5307
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number5/8-11UNC-3A X3 1/4 INCHES
NSN5307-01-306-7534
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-11UNC-3A X3 1/4 INCHES · 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
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
THREAD CLASS: 3A STUD THREAD A
•
NONDEFINITIVE SPEC/STD DATA: IV TYPE
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) STUD THREAD
•
DEPARTURE FROM CITED DOCUMENT: QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
•
MATERIAL: NICKEL ALLOY 400
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZW
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD CLASS3A STUD THREAD A
NONDEFINITIVE SPEC/STD DATAIV TYPE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) STUD THREAD
DEPARTURE FROM CITED DOCUMENTQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
MATERIALNICKEL ALLOY 400
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
THREAD QUANTITY PER INCH11 STUD THREAD
NOMINAL THREAD SIZE0.625 INCHES STUD THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
5/8-11UNC-2A X 4 1/2 INCHESL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400, CLASS AInterchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESInterchangeable
interchangeable cross-reference
interchangeable
1/2-13UNC-2Z X 5, TYI CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281, GRADE 400, CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/8-11UNC-3A X3 1/4 INCHES?
5/8-11UNC-3A X3 1/4 INCHES is a 5/8-11UNC-3A X3 1/4 INCHES.
What parts can replace 5/8-11UNC-3A X3 1/4 INCHES?
There are 25 known substitutes for 5/8-11UNC-3A X3 1/4 INCHES: 5/8-11UNC-2A X 4 1/2 INCHESL1, QQ-N-281 GRADE 400, CLASS A, 5/8-11UNC-2A X 4 1/2 INCHES and 22 more. Substitute compatibility should be verified for your specific system.
Is 5/8-11UNC-3A X3 1/4 INCHES still available?
5/8-11UNC-3A X3 1/4 INCHES 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