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1 - 8UNRC - 3A X 2 3/4 — Technical Data Sheet

✓ 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 SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 3A A, fastener_length: 2.750 INCHES MAXIMUM IN, special_features: SCREW, CAP, SOCKET HEAD, SELF LOCKING (REQUESTED NAME), end_item_identification: VALVE SHEAR, nominal_thread_diameter: 1.000 INCHES IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5305-01-429-5654, 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 - 8UNRC - 3A X 2 3/4
NSN: 5305-01-429-5654
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class3A A
fastener_length2.750 INCHES MAXIMUM IN
special_featuresSCREW, CAP, SOCKET HEAD, SELF LOCKING (REQUESTED NAME)
end_item_identificationVALVE SHEAR
nominal_thread_diameter1.000 INCHES IN
thread_quantity_per_inch8
thread_series_designatorUNRC
criticality_code_justificationZZZX
departure_from_cited_designatorMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
material_document_and_classificationQQ-N-286 GR 500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5305-01-429-5654
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1 - 8UNRC - 3A X 2 3/4 · 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
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
THREAD SERIES DESIGNATOR: UNRC
•
MATERIAL: NICKEL ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286 GR 500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD QUANTITY PER INCH: 8
•
FASTENER LENGTH: 2.750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESSCREW, CAP, SOCKET HEAD, SELF LOCKING (REQUESTED NAME)
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
THREAD SERIES DESIGNATORUNRC
MATERIALNICKEL ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 GR 500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
END ITEM IDENTIFICATIONVALVE SHEAR
THREAD QUANTITY PER INCH8
FASTENER LENGTH2.750 INCHES MAXIMUM IN
THREAD CLASS3A A
CRITICALITY CODE JUSTIFICATIONZZZX
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
LL57U40J6MInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
61511800524InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
910060-0406InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2585164InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-DTL-18240InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
FFS92InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1 - 8UNRC - 3A X 2 3/4?
1 - 8UNRC - 3A X 2 3/4 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 1 - 8UNRC - 3A X 2 3/4?
There are 25 known substitutes for 1 - 8UNRC - 3A X 2 3/4: LL57U40J6M, 61511800524, 910060-0406 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1 - 8UNRC - 3A X 2 3/4?
1 - 8UNRC - 3A X 2 3/4 is cataloged in the Federal Logistics Information System under NSN 5305-01-429-5654. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026