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PartsTable / COMPONENT / TYPE 1 3/8-16UNC-3A X 7/8LG
TYPE 1 3/8-16UNC-3A X 7/8LG ✓ 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 TYPE 1 3/8-16UNC-3A X 7/8LG 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 5305-01-300-3973, 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
TYPE 1 3/8-16UNC-3A X 7/8LG
NSN: 5305-01-300-3973
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberTYPE 1 3/8-16UNC-3A X 7/8LG
NSN5305-01-300-3973
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: TYPE 1 3/8-16UNC-3A X 7/8LG · 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 CLASS: 3A A
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: NICKEL ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286,CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
HARDNESS RATING: 24.0 ROCKWELL C MINIMUM OVERALL
•
HEAD STYLE: HEXAGON
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A A
CRITICALITY CODE JUSTIFICATIONZZZW
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALNICKEL ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286,CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING24.0 ROCKWELL C MINIMUM OVERALL
HEAD STYLEHEXAGON
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
THREAD QUANTITY PER INCH16
NOMINAL THREAD DIAMETER0.375 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
999F0937 FN 53L1Interchangeable
interchangeable cross-reference
interchangeable
PL-999F0937 FN 53L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TY 1 GR500Interchangeable
interchangeable cross-reference
interchangeable
3/8-16UNC-3A X 7/8Interchangeable
interchangeable cross-reference
interchangeable
0.375-16UNC-3A X 0.875Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TY IIInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is TYPE 1 3/8-16UNC-3A X 7/8LG?
TYPE 1 3/8-16UNC-3A X 7/8LG is a TYPE 1 3/8-16UNC-3A X 7/8LG.
What parts can replace TYPE 1 3/8-16UNC-3A X 7/8LG?
There are 15 known substitutes for TYPE 1 3/8-16UNC-3A X 7/8LG: 999F0937 FN 53L1, PL-999F0937 FN 53L1, MIL-DTL-1222 TY 1 GR500 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for TYPE 1 3/8-16UNC-3A X 7/8LG?
TYPE 1 3/8-16UNC-3A X 7/8LG is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-300-3973. 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