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Technical Data Sheet
PartsTable / COMPONENT / 3/4-10UNC X 2-3/4 LG
3/4-10UNC X 2-3/4 LG ✓ 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 3/4-10UNC X 2-3/4 LG 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 5305-00-226-9221, 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
3/4-10UNC X 2-3/4 LG
NSN: 5305-00-226-9221
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number3/4-10UNC X 2-3/4 LG
NSN5305-00-226-9221
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3/4-10UNC X 2-3/4 LG · 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
•
MATERIAL: NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
FASTENER LENGTH: 2.750 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
•
THREAD QUANTITY PER INCH: 10
•
WIDTH BETWEEN FLATS: 1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALNICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
FASTENER LENGTH2.750 INCHES NOMINAL IN
HEAD STYLEHEXAGON
THREAD QUANTITY PER INCH10
WIDTH BETWEEN FLATS1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
THREAD CLASS2A A
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
MIL-DTL-1222 QQ-N-281 GR400L1Interchangeable
interchangeable cross-reference
interchangeable
3/4-10UNC-2A X 2 3/4 TYPE 1 CLL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 QQ-N-281 GR400Interchangeable
interchangeable cross-reference
interchangeable
820-0750-22-169Interchangeable
interchangeable cross-reference
interchangeable
N-999-64GD-A-001 PIECE 70Interchangeable
interchangeable cross-reference
interchangeable
3/4-10UNC X 2-3 /4 LGInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3/4-10UNC X 2-3/4 LG?
3/4-10UNC X 2-3/4 LG is a 3/4-10UNC X 2-3/4 LG.
What parts can replace 3/4-10UNC X 2-3/4 LG?
There are 8 known substitutes for 3/4-10UNC X 2-3/4 LG: MIL-DTL-1222 QQ-N-281 GR400L1, 3/4-10UNC-2A X 2 3/4 TYPE 1 CLL1, MIL-DTL-1222 QQ-N-281 GR400 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3/4-10UNC X 2-3/4 LG?
3/4-10UNC X 2-3/4 LG is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-226-9221. 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