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Technical Data Sheet
PartsTable / COMPONENT / SIZE 0.312-18UNRC-3A X 0.750
SIZE 0.312-18UNRC-3A X 0.750 ✓ 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 SIZE 0.312-18UNRC-3A X 0.750 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 5305-01-398-9865, 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
SIZE 0.312-18UNRC-3A X 0.750
NSN: 5305-01-398-9865
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberSIZE 0.312-18UNRC-3A X 0.750
NSN5305-01-398-9865
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SIZE 0.312-18UNRC-3A X 0.750 · 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 OVERALL
•
THREAD SERIES DESIGNATOR: UNRC
•
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 GR500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD QUANTITY PER INCH: 18
•
FASTENER LENGTH: 0.750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESSCREW, CAP, SOCKET HEAD, SELF LOCKING (REQUESTED NAME)
MATERIALNICKEL ALLOY OVERALL
THREAD SERIES DESIGNATORUNRC
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 GR500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD QUANTITY PER INCH18
FASTENER LENGTH0.750 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONTRASH EJECTOR ASSY
THREAD CLASS3A A
CRITICALITY CODE JUSTIFICATIONZZZX
VERIFIED SUBSTITUTES & CROSS-REFERENCES 33
803-4385050 PIECE 67L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TY IIL1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TY IIInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222, TY IIInterchangeable
interchangeable cross-reference
interchangeable
810-4385050 ITEM 114Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SIZE 0.312-18UNRC-3A X 0.750?
SIZE 0.312-18UNRC-3A X 0.750 is a SIZE 0.312-18UNRC-3A X 0.750.
What parts can replace SIZE 0.312-18UNRC-3A X 0.750?
There are 33 known substitutes for SIZE 0.312-18UNRC-3A X 0.750: 803-4385050 PIECE 67L1, MIL-DTL-1222 TY IIL1, MIL-DTL-1222 TY II and 30 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SIZE 0.312-18UNRC-3A X 0.750?
SIZE 0.312-18UNRC-3A X 0.750 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-398-9865. 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