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PartsTable / COMPONENT / MIL-DTL-1222TY21-8UNRC-3A2-1/4
MIL-DTL-1222TY21-8UNRC-3A2-1/4 ✓ 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 MIL-DTL-1222TY21-8UNRC-3A2-1/4 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 5305-01-348-1724, 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
MIL-DTL-1222TY21-8UNRC-3A2-1/4
NSN: 5305-01-348-1724
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMIL-DTL-1222TY21-8UNRC-3A2-1/4
NSN5305-01-348-1724
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-DTL-1222TY21-8UNRC-3A2-1/4 · 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
•
FASTENER LENGTH: 2.500 INCHES MAXIMUM IN
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
MATERIAL: NICKEL ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286 GR 500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD LENGTH: 2.500 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 1.000 INCHES IN
•
CRITICALITY CODE JUSTIFICATION: ZZZW
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH2.500 INCHES MAXIMUM IN
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
MATERIALNICKEL ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 GR 500 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD LENGTH2.500 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER1.000 INCHES IN
SPECIAL FEATURESSCREW, CAP, SOCKET HEAD, SELF LOCKING (REQUESTED NAME)
CRITICALITY CODE JUSTIFICATIONZZZW
THREAD QUANTITY PER INCH8
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 36
501-4675682 ITEM 4Interchangeable
interchangeable cross-reference
interchangeable
501-4675682 ITEM 4L1Interchangeable
interchangeable cross-reference
interchangeable
1.500-06UNC-2A X 5.000L1Interchangeable
interchangeable cross-reference
interchangeable
2642-774-01 ITEM 31L1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-286, GRADE 500Interchangeable
interchangeable cross-reference
interchangeable
FF-S-86, TYPE VI SELF-LOCKINGL1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-1222TY21-8UNRC-3A2-1/4?
MIL-DTL-1222TY21-8UNRC-3A2-1/4 is a MIL-DTL-1222TY21-8UNRC-3A2-1/4.
What parts can replace MIL-DTL-1222TY21-8UNRC-3A2-1/4?
There are 36 known substitutes for MIL-DTL-1222TY21-8UNRC-3A2-1/4: 501-4675682 ITEM 4, 501-4675682 ITEM 4L1, 1.500-06UNC-2A X 5.000L1 and 33 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-DTL-1222TY21-8UNRC-3A2-1/4?
MIL-DTL-1222TY21-8UNRC-3A2-1/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-348-1724. 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.
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Last verified: July 2026