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PartsTable / COMPONENT / 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1
1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1 ✓ 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 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1 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 5307-01-166-7137, 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 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1
NSN: 5307-01-166-7137
FSC: 5307
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part Number1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1
NSN5307-01-166-7137
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1 · 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
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286 CL A FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD CLASS: 2A LOCATION NOT OTHERWISE SPECIFIED A
•
NOMINAL THREAD SIZE: 1.375 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALNICKEL ALLOY
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 CL A FED SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH9.000 INCHES NOMINAL IN
THREAD CLASS2A LOCATION NOT OTHERWISE SPECIFIED A
NOMINAL THREAD SIZE1.375 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) LOCATION NOT OTHERWISE SPECIFIED
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
THREAD QUANTITY PER INCH6 LOCATION NOT OTHERWISE SPECIFIED
CRITICALITY CODE JUSTIFICATIONZZZX
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
3/8-16UNC-3A X 7/8L1Interchangeable
interchangeable cross-reference
interchangeable
TYPE 1 3/8-16UNC-3A X 7/8LGL1Interchangeable
interchangeable cross-reference
interchangeable
GR500 (QQ-N-286)L1Interchangeable
interchangeable cross-reference
interchangeable
0.500-13UNC-2AX2.50 LONGInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TY1 GR500Interchangeable
interchangeable cross-reference
interchangeable
111-8500406 ITEM 7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1?
1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1 is a 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1.
What parts can replace 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1?
There are 16 known substitutes for 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1: 3/8-16UNC-3A X 7/8L1, TYPE 1 3/8-16UNC-3A X 7/8LGL1, GR500 (QQ-N-286)L1 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1?
1 3/8-6UNC-3A3AX9(T3 1/4 X B2)L1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-01-166-7137. 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