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Technical Data Sheet
PartsTable / COMPONENT / 5/8-11UNC-3A X 2
5/8-11UNC-3A X 2 ✓ 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 2 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 5307-01-307-0378, 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 2
NSN: 5307-01-307-0378
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 2
NSN5307-01-307-0378
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-11UNC-3A X 2 · 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 DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
•
NONDEFINITIVE SPEC/STD DATA: IV TYPE
•
THREAD QUANTITY PER INCH: 11 LOCATION NOT OTHERWISE SPECIFIED
•
THREAD CLASS: 3A LOCATION NOT OTHERWISE SPECIFIED A
•
NOMINAL THREAD SIZE: 0.625 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL: NICKEL ALLOY 400
TECHNICAL CHARACTERISTICS (FLIS)
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281,CL A,GR 400 FED SPEC SINGLE MATERIAL RESPONSE
NONDEFINITIVE SPEC/STD DATAIV TYPE
OVERALL LENGTH2.000 INCHES NOMINAL IN
THREAD QUANTITY PER INCH11 LOCATION NOT OTHERWISE SPECIFIED
THREAD CLASS3A LOCATION NOT OTHERWISE SPECIFIED A
NOMINAL THREAD SIZE0.625 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
MATERIALNICKEL ALLOY 400
CRITICALITY CODE JUSTIFICATIONZZZX
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
MIL-DTL-1222 TYPE IVL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GR400 CLASS AL1Interchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC - 3A X 2L1Interchangeable
interchangeable cross-reference
interchangeable
3/4 IN (ROUND)FORM 1L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GR400 CLASS AInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE IVInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/8-11UNC-3A X 2?
5/8-11UNC-3A X 2 is a 5/8-11UNC-3A X 2.
What parts can replace 5/8-11UNC-3A X 2?
There are 6 known substitutes for 5/8-11UNC-3A X 2: MIL-DTL-1222 TYPE IVL1, QQ-N-281 GR400 CLASS AL1, 5/8-11UNC - 3A X 2L1 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/8-11UNC-3A X 2?
5/8-11UNC-3A X 2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-307-0378. 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.
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Last verified: July 2026