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PartsTable / COMPONENT / MILS1222TYIIIGR4 11/4 8UN
MILS1222TYIIIGR4 11/4 8UN ✓ 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 MILS1222TYIIIGR4 11/4 8UN 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 5310-01-045-1608, 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
MILS1222TYIIIGR4 11/4 8UN
NSN: 5310-01-045-1608
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part NumberMILS1222TYIIIGR4 11/4 8UN
NSN5310-01-045-1608
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILS1222TYIIIGR4 11/4 8UN · 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
•
DEPARTURE FROM CITED DOCUMENT: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 8
•
NOMINAL THREAD SIZE: 1.250 INCHES IN
•
THREAD CLASS: 2B
•
MATERIAL: STEEL OVERALL
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
DEPARTURE FROM CITED DOCUMENTQUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
CRITICALITY CODE JUSTIFICATIONZZZW
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH8
NOMINAL THREAD SIZE1.250 INCHES IN
THREAD CLASS2B
MATERIALSTEEL OVERALL
NUT STYLEHEXAGON
WIDTH ACROSS FLATS1.334 INCHES NOMINAL IN
NUT HEIGHT1.062 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
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
76749-13X2PCF7L1Interchangeable
interchangeable cross-reference
interchangeable
975-298PCF6L1Interchangeable
interchangeable cross-reference
interchangeable
975-240PCF7L1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILS1222TYIIIGR4 11/4 8UN?
MILS1222TYIIIGR4 11/4 8UN is a MILS1222TYIIIGR4 11/4 8UN.
What parts can replace MILS1222TYIIIGR4 11/4 8UN?
There are 15 known substitutes for MILS1222TYIIIGR4 11/4 8UN: 22600N PIECE 38, MIL-DTL-1222,TYIII,GR4,STYA, TYIII,GR 4,STY A,1-8UNC-2B and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILS1222TYIIIGR4 11/4 8UN?
MILS1222TYIIIGR4 11/4 8UN is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-045-1608. 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