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PartsTable / COMPONENT / MIL-DTL-1222 TYPE III
MIL-DTL-1222 TYPE III ✓ 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 NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include thread_class: 3B, thread_series: UN, thread_direction: RIGHT-HAND, nominal_thread_size: 1.250 INCHES IN, departure_from_cited_document: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS, criticality_code_justification: ZZZW. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-935-1255, 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 TYPE III
NSN: 5310-00-935-1255
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
thread_class3B
thread_seriesUN
thread_directionRIGHT-HAND
nominal_thread_size1.250 INCHES IN
thread_quantity_per_inch8
departure_from_cited_documentMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
criticality_code_justificationZZZW
NSN5310-00-935-1255
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-DTL-1222 TYPE III · 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
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
TECHNICAL CHARACTERISTICS (FLIS)
CRITICALITY CODE JUSTIFICATIONZZZX
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
SPECIAL FEATURESNUT,HEX,HEAVY DUTY (REQUESTED NAME)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
9/16-12UNC-2BL1Interchangeable
interchangeable cross-reference
interchangeable
803-2177525-M5XX-12Interchangeable
interchangeable cross-reference
interchangeable
803-2177525-M5XX-12L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222L1Interchangeable
interchangeable cross-reference
interchangeable
2013-100 ITEM 9L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222 TYPE IIIInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-1222 TYPE III?
MIL-DTL-1222 TYPE III is a NUT,PLAIN,HEXAGON.
What parts can replace MIL-DTL-1222 TYPE III?
There are 20 known substitutes for MIL-DTL-1222 TYPE III: 9/16-12UNC-2BL1, 803-2177525-M5XX-12, 803-2177525-M5XX-12L1 and 17 more. Substitute compatibility should be verified for your specific system.
Is MIL-DTL-1222 TYPE III still available?
MIL-DTL-1222 TYPE III 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