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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-1222,TYIII,GR 4,STY A
MIL-DTL-1222,TYIII,GR 4,STY A ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The MIL-DTL-1222,TYIII,GR 4,STY A is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-458-0465, 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-1222,TYIII,GR 4,STY A
NSN: 5310-00-458-0465
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMIL-DTL-1222,TYIII,GR 4,STY A
NSN5310-00-458-0465
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-DTL-1222,TYIII,GR 4,STY A · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2B
•
TEMP RATING: 875.0 FAHRENHEIT MINIMUM AND 1000.0 FAHRENHEIT MAXIMUM DEGF
•
THREAD QUANTITY PER INCH: 10
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND 4 GRADE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
CRITICALITY CODE JUSTIFICATIONZZZX
NOMINAL THREAD SIZE0.750 INCHES IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
TEMP RATING875.0 FAHRENHEIT MINIMUM AND 1000.0 FAHRENHEIT MAXIMUM DEGF
THREAD QUANTITY PER INCH10
NONDEFINITIVE SPEC/STD DATA3 TYPE AND 4 GRADE
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
22600N PIECE 38Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222,TYIII,GR4,STYAInterchangeable
interchangeable cross-reference
interchangeable
TYIII,GR 4,STY A,1-8UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MS16286-11L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222,TYIII,GR4,STYAL1Interchangeable
interchangeable cross-reference
interchangeable
1.12508UNC2BT3G4NSAFAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-1222,TYIII,GR 4,STY A?
MIL-DTL-1222,TYIII,GR 4,STY A is a MIL-DTL-1222,TYIII,GR 4,STY A.
What parts can replace MIL-DTL-1222,TYIII,GR 4,STY A?
There are 19 known substitutes for MIL-DTL-1222,TYIII,GR 4,STY A: 22600N PIECE 38, MIL-DTL-1222,TYIII,GR4,STYA, TYIII,GR 4,STY A,1-8UNC-2B and 16 more. Substitute compatibility should be verified for your specific system.
Is MIL-DTL-1222,TYIII,GR 4,STY A still available?
MIL-DTL-1222,TYIII,GR 4,STY A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026