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Technical Data Sheet
PartsTable / COMPONENT / 5/8-11UNC-3A-2A X 3 1/4LG
5/8-11UNC-3A-2A X 3 1/4LG ✓ 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-2A X 3 1/4LG 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 5307-01-218-9934, 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-2A X 3 1/4LG
NSN: 5307-01-218-9934
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-2A X 3 1/4LG
NSN5307-01-218-9934
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-11UNC-3A-2A X 3 1/4LG · 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
•
CRITICALITY CODE JUSTIFICATION: ZZZX
TECHNICAL CHARACTERISTICS (FLIS)
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
PART NAME ASSIGNED BY CONTROLLING AGENCYSTUD, CONSTANT STRENGTH (INAVY)
END ITEM IDENTIFICATIONTRAP STM THRMODY 1.00IPS FLGE 600PSI HORZ
CRITICALITY CODE JUSTIFICATIONZZZX
SPECIAL FEATURESSTUD, CONSTANT STRENGTH (REQUESTED NAME)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
ASTM-A193 GRADE B16L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE III STYLE DInterchangeable
interchangeable cross-reference
interchangeable
ASTM-A193 GRADE B16Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE III STYLE DL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-286 GRADE 500L1Interchangeable
interchangeable cross-reference
interchangeable
BG50901-48-16 ITEM 11L1Interchangeable
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-2A X 3 1/4LG?
5/8-11UNC-3A-2A X 3 1/4LG is a 5/8-11UNC-3A-2A X 3 1/4LG.
What parts can replace 5/8-11UNC-3A-2A X 3 1/4LG?
There are 13 known substitutes for 5/8-11UNC-3A-2A X 3 1/4LG: ASTM-A193 GRADE B16L1, MIL-DTL-1222 TYPE III STYLE D, ASTM-A193 GRADE B16 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/8-11UNC-3A-2A X 3 1/4LG?
5/8-11UNC-3A-2A X 3 1/4LG is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-218-9934. 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