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Technical Data Sheet
PartsTable / COMPONENT / 1/4-20UNC-3A 1 LG
1/4-20UNC-3A 1 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 1/4-20UNC-3A 1 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 5305-01-332-2167, 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
1/4-20UNC-3A 1 LG
NSN: 5305-01-332-2167
FSC: 5305
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
Part Number1/4-20UNC-3A 1 LG
NSN5305-01-332-2167
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/4-20UNC-3A 1 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
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
•
HEAD DIAMETER: 0.480 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 20
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
NONDEFINITIVE SPEC/STD DATA: 4 TYPE
•
THREAD CLASS: 3A A
•
MATERIAL: NICKEL ALLOY 400 OVERALL
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM
HEAD DIAMETER0.480 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
NONDEFINITIVE SPEC/STD DATA4 TYPE
THREAD CLASS3A A
MATERIALNICKEL ALLOY 400 OVERALL
FASTENER LENGTH1.000 INCHES NOMINAL IN
MINIMUM YIELD STRENGTH40000 POUNDS PER SQUARE INCH LBS
WIDTH ACROSS FLATS0.156 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
NASM24671-78Interchangeable
interchangeable cross-reference
interchangeable
MS24671-78Interchangeable
interchangeable cross-reference
interchangeable
FF-S-86 TYPE IVInterchangeable
interchangeable cross-reference
interchangeable
51480Interchangeable
interchangeable cross-reference
interchangeable
100A905078Interchangeable
interchangeable cross-reference
interchangeable
92197A244Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/4-20UNC-3A 1 LG?
1/4-20UNC-3A 1 LG is a 1/4-20UNC-3A 1 LG.
What parts can replace 1/4-20UNC-3A 1 LG?
There are 17 known substitutes for 1/4-20UNC-3A 1 LG: NASM24671-78, MS24671-78, FF-S-86 TYPE IV and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/4-20UNC-3A 1 LG?
1/4-20UNC-3A 1 LG is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-332-2167. 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