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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-1222,TYIII,GR4,STYA
MIL-DTL-1222,TYIII,GR4,STYA ✓ 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,GR4,STYA 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 5310-00-145-2002, 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,GR4,STYA
NSN: 5310-00-145-2002
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,GR4,STYA
NSN5310-00-145-2002
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-DTL-1222,TYIII,GR4,STYA · 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 QUANTITY PER INCH: 8
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND 4 GRADE
•
NUT STYLE: HEXAGON
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
MATERIAL: STEEL OVERALL
•
TEMP RATING: 875.0 CELSIUS MINIMUM AND 1000.0 CELSIUS MAXIMUM DEGC
•
BEARING SURFACE TYPE: WASHER FACED
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH8
NONDEFINITIVE SPEC/STD DATA3 TYPE AND 4 GRADE
NUT STYLEHEXAGON
NOMINAL THREAD SIZE1.000 INCHES IN
MATERIALSTEEL OVERALL
TEMP RATING875.0 CELSIUS MINIMUM AND 1000.0 CELSIUS MAXIMUM DEGC
BEARING SURFACE TYPEWASHER FACED
THREAD DIRECTIONRIGHT-HAND
HARDNESS RATING24.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
76749-13X2PCF7L1Interchangeable
interchangeable cross-reference
interchangeable
975-298PCF6L1Interchangeable
interchangeable cross-reference
interchangeable
975-240PCF7L1Interchangeable
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
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-1222,TYIII,GR4,STYA?
MIL-DTL-1222,TYIII,GR4,STYA is a MIL-DTL-1222,TYIII,GR4,STYA.
What parts can replace MIL-DTL-1222,TYIII,GR4,STYA?
There are 13 known substitutes for MIL-DTL-1222,TYIII,GR4,STYA: 76749-13X2PCF7L1, 975-298PCF6L1, 975-240PCF7L1 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-DTL-1222,TYIII,GR4,STYA?
MIL-DTL-1222,TYIII,GR4,STYA is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-145-2002. 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