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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-1222/TY1GR5
MIL-DTL-1222/TY1GR5 ✓ 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/TY1GR5 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 5310-00-551-6691, 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/TY1GR5
NSN: 5310-00-551-6691
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/TY1GR5
NSN5310-00-551-6691
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-DTL-1222/TY1GR5 · 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: 10
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: WASHER FACED
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
WIDTH ACROSS FLATS: 1.0450 INCHES MINIMUM AND 1.0625 INCHES MAXIMUM IN
•
THREAD CLASS: 3B
•
DEPARTURE FROM CITED DESIGNATOR: AS MODIFIED BY NOMINAL THREAD SIZE AND THREADS PER INCH
•
NUT HEIGHT: 0.642 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH10
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.750 INCHES IN
WIDTH ACROSS FLATS1.0450 INCHES MINIMUM AND 1.0625 INCHES MAXIMUM IN
THREAD CLASS3B
DEPARTURE FROM CITED DESIGNATORAS MODIFIED BY NOMINAL THREAD SIZE AND THREADS PER INCH
NUT HEIGHT0.642 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN
NUT STYLEHEXAGON
NONDEFINITIVE SPEC/STD DATAA7 TYPE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
2D06Interchangeable
interchangeable cross-reference
interchangeable
32X34RInterchangeable
interchangeable cross-reference
interchangeable
X18129Interchangeable
interchangeable cross-reference
interchangeable
8027177Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA7Interchangeable
interchangeable cross-reference
interchangeable
M1222B2X7C272GFNNInterchangeable
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/TY1GR5?
MIL-DTL-1222/TY1GR5 is a MIL-DTL-1222/TY1GR5.
What parts can replace MIL-DTL-1222/TY1GR5?
There are 10 known substitutes for MIL-DTL-1222/TY1GR5: 2D06, 32X34R, X18129 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-DTL-1222/TY1GR5?
MIL-DTL-1222/TY1GR5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-551-6691. 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