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Technical Data Sheet
PartsTable / COMPONENT / 5/8-11UNC-3A X 3 1/2 INCHES
5/8-11UNC-3A X 3 1/2 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 X 3 1/2 INCHES 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 5307-01-306-7558, 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 X 3 1/2 INCHES
NSN: 5307-01-306-7558
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 X 3 1/2 INCHES
NSN5307-01-306-7558
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-11UNC-3A X 3 1/2 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
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) STUD THREAD
•
NOMINAL THREAD SIZE: 0.625 INCHES STUD THREAD IN
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
•
MATERIAL: NICKEL ALLOY 400
•
THREAD CLASS: 3A STUD THREAD A
TECHNICAL CHARACTERISTICS (FLIS)
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) STUD THREAD
NOMINAL THREAD SIZE0.625 INCHES STUD THREAD IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
OVERALL LENGTH3.500 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
MATERIALNICKEL ALLOY 400
THREAD CLASS3A STUD THREAD A
NONDEFINITIVE SPEC/STD DATAIV TYPE
CRITICALITY CODE JUSTIFICATIONZZZW
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/8-11UNC-3A X 3 1/2 INCHES?
5/8-11UNC-3A X 3 1/2 INCHES is a 5/8-11UNC-3A X 3 1/2 INCHES.
What parts can replace 5/8-11UNC-3A X 3 1/2 INCHES?
There are 26 known substitutes for 5/8-11UNC-3A X 3 1/2 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 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/8-11UNC-3A X 3 1/2 INCHES?
5/8-11UNC-3A X 3 1/2 INCHES is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-306-7558. 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