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Technical Data Sheet
PartsTable / COMPONENT / 3/8-16UNC-3A X 1 3/4 IN. LG
3/8-16UNC-3A X 1 3/4 IN. 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 3/8-16UNC-3A X 1 3/4 IN. 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 5305-01-321-8463, 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
3/8-16UNC-3A X 1 3/4 IN. LG
NSN: 5305-01-321-8463
FSC: 5305
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part Number3/8-16UNC-3A X 1 3/4 IN. LG
NSN5305-01-321-8463
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3/8-16UNC-3A X 1 3/4 IN. 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
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
FASTENER LENGTH: 1.750 INCHES NOMINAL IN
•
SCREW MATERIAL: NICKEL ALLOY 400
•
THREAD CLASS: 3A A
•
INTERNAL DRIVE STYLE: SLOT
•
HEAD STYLE: FLAT COUNTERSUNK
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2S STYLE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FASTENER LENGTH1.750 INCHES NOMINAL IN
SCREW MATERIALNICKEL ALLOY 400
THREAD CLASS3A A
INTERNAL DRIVE STYLESLOT
HEAD STYLEFLAT COUNTERSUNK
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 2S STYLE
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH16
THREAD LENGTH1.458 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
585-6406777-131Interchangeable
interchangeable cross-reference
interchangeable
122-6600341 PC 73Interchangeable
interchangeable cross-reference
interchangeable
0.37516UNRC3AX1.750LInterchangeable
interchangeable cross-reference
interchangeable
FF-S-92Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3/8-16UNC-3A X 1 3/4 IN. LG?
3/8-16UNC-3A X 1 3/4 IN. LG is a 3/8-16UNC-3A X 1 3/4 IN. LG.
What parts can replace 3/8-16UNC-3A X 1 3/4 IN. LG?
There are 4 known substitutes for 3/8-16UNC-3A X 1 3/4 IN. LG: 585-6406777-131, 122-6600341 PC 73, 0.37516UNRC3AX1.750L and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3/8-16UNC-3A X 1 3/4 IN. LG?
3/8-16UNC-3A X 1 3/4 IN. LG is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-321-8463. 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