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Technical Data Sheet
PartsTable / COMPONENT / 5/8-11 2ATHD UNC X 1.750 L
5/8-11 2ATHD UNC X 1.750 L ✓ 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 5/8-11 2ATHD UNC X 1.750 L 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 5306-00-226-9876, 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
5/8-11 2ATHD UNC X 1.750 L
NSN: 5306-00-226-9876
FSC: 5306
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number5/8-11 2ATHD UNC X 1.750 L
NSN5306-00-226-9876
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5/8-11 2ATHD UNC X 1.750 L · 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
•
HEAD HEIGHT: 0.391 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.750 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 0.906 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC OVERALL
•
THREAD LENGTH: 1.250 INCHES MINIMUM IN
•
THREAD CLASS: 2A A
•
NONDEFINITIVE SPEC/STD DATA: A CLASS AND B TYPE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.391 INCHES NOMINAL IN
FASTENER LENGTH1.750 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.906 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
THREAD LENGTH1.250 INCHES MINIMUM IN
THREAD CLASS2A A
NONDEFINITIVE SPEC/STD DATAA CLASS AND B TYPE
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
MILB857AUpgraded Successor
successor cross-reference
successor
MIL-S-1222Upgraded Successor
successor cross-reference
successor
FFB575Upgraded Successor
successor cross-reference
successor
M1222B2N6C228GCNZEUpgraded Successor
successor cross-reference
successor
280450PC266Interchangeable
interchangeable cross-reference
interchangeable
M1222RN8C216GFNZEInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5/8-11 2ATHD UNC X 1.750 L?
5/8-11 2ATHD UNC X 1.750 L is a 5/8-11 2ATHD UNC X 1.750 L.
What parts can replace 5/8-11 2ATHD UNC X 1.750 L?
There are 20 known substitutes for 5/8-11 2ATHD UNC X 1.750 L: MILB857A, MIL-S-1222, FFB575 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5/8-11 2ATHD UNC X 1.750 L?
5/8-11 2ATHD UNC X 1.750 L is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-226-9876. 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