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PartsTable / COMPONENT / MIL-DTL-1222 GRADE 7 TYPE I
MIL-DTL-1222 GRADE 7 TYPE I ✓ 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 material: STEEL OVERALL, thread_series: UNIFIED NATIONAL COARSE (UNC), nominal_thread_size: 0.625 INCHES IN, thread_quantity_per_inch: 11, nondefinitive_spec/std_data: 2 TYPE, departure_from_cited_document: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-377-6272, 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 GRADE 7 TYPE I
NSN: 5310-01-377-6272
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
thread_seriesUNIFIED NATIONAL COARSE (UNC)
nominal_thread_size0.625 INCHES IN
thread_quantity_per_inch11
nondefinitive_spec/std_data2 TYPE
departure_from_cited_documentMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
criticality_code_justificationZZZW
NSN5310-01-377-6272
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MIL-DTL-1222 GRADE 7 TYPE I · 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: 11
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH11
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
NONDEFINITIVE SPEC/STD DATA2 TYPE
CRITICALITY CODE JUSTIFICATIONZZZW
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.625 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 33
5/8-11UNC2BInterchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESL1Interchangeable
interchangeable cross-reference
interchangeable
QQ-N-281 GRADE 400, CLASS AInterchangeable
interchangeable cross-reference
interchangeable
5/8-11UNC-2A X 4 1/2 INCHESInterchangeable
interchangeable cross-reference
interchangeable
24573N PIECE 22Interchangeable
interchangeable cross-reference
interchangeable
1/2-13 UNC-2B,TYPE 1Interchangeable
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 GRADE 7 TYPE I?
MIL-DTL-1222 GRADE 7 TYPE I is a NUT,PLAIN,HEXAGON.
What parts can replace MIL-DTL-1222 GRADE 7 TYPE I?
There are 33 known substitutes for MIL-DTL-1222 GRADE 7 TYPE I: 5/8-11UNC2B, 5/8-11UNC-2A X 4 1/2 INCHESL1, QQ-N-281 GRADE 400, CLASS A and 30 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-DTL-1222 GRADE 7 TYPE I?
MIL-DTL-1222 GRADE 7 TYPE I is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-377-6272. 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