PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-S-1222Nut,plain,hexagon

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5310-01-202-3426 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-202-3426 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-202-3426. Primary manufacturer part number: MIL-S-1222.
Features
  • Nut,plain,hexagon — FSC 5310
  • Thread Class: 2B
  • Bearing Surface Type: WASHER FACED
  • Thread Quantity Per Inch: 11
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Criticality Code Justification: ZZZW
  • Nominal Thread Size: 0.625 INCHES IN
  • Nut Style: HEXAGON
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Nickel Alloy Overall construction
General Description

The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-202-3426, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-202-3426
Primary Part NumberMIL-S-1222
Item NameNut,plain,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Thread Class2B
Bearing Surface TypeWASHER FACED
Thread Quantity Per Inch11
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Criticality Code JustificationZZZW
Nominal Thread Size0.625 INCHES IN
Nut StyleHEXAGON
Width Across Flats0.932 INCHES MINIMUM AND 0.938 INCHES MAXIMUM IN
Departure From Cited DocumentMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Thread DirectionRIGHT-HAND
Material Document and ClassificationQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MaterialNICKEL ALLOY OVERALL
Nut Height0.535 INCHES MINIMUM AND 0.559 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-321-2410 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-037-3425 INTERCHANGEABLE
Nut,plain,hexagon
5306-01-038-0329 INTERCHANGEABLE
Bolt,machine
5310-01-038-0374 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-038-0375 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-038-0376 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-038-5899 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-111-0637 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-111-0639 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-111-0641 INTERCHANGEABLE
Nut,plain,hexagon
Cross-Reference Index
Part NumberManufacturer
MIL-S-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
000.625-11UNC-2B Naval Inventory Control Point Mechanicsburg (USA)
MIL-DTL-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MILS1222-QQN281-5/8-11UNC2BTY1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-S-1222/QQ-N-281 Naval Inventory Control Point Mechanicsburg (USA)
MIL-B-857 TY 2,STY A Naval Inventory Control Point Mechanicsburg (USA)
Related Parts
5310-00-321-2410INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-037-3425INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5306-01-038-0329INTERCHANGEABLE
BOLT,MACHINE
5310-01-038-0374INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-038-0375INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-038-0376INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-038-5899INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-111-0637INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-111-0639INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-111-0641INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-111-5211INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-111-5215INTERCHANGEABLE
NUT,PLAIN,HEXAGON

Frequently Asked Questions

What is NSN 5310-01-202-3426?

NSN 5310-01-202-3426 is a Nut,plain,hexagon, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-202-3426?

NSN 5310-01-202-3426 has 6 cross-referenced part numbers: MIL-S-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 000.625-11UNC-2B (Naval Inventory Control Point Mechanicsburg), MIL-DTL-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MILS1222-QQN281-5/8-11UNC2BTY1 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-S-1222/QQ-N-281 (Naval Inventory Control Point Mechanicsburg) and 1 more.

What NSN replaces 5310-01-202-3426?

There are 12 known substitutes for 5310-01-202-3426: 5310-00-321-2410, 5310-01-037-3425, 5306-01-038-0329 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-S-1222?

Key specifications for MIL-S-1222: Thread Class: 2B; Bearing Surface Type: WASHER FACED; Thread Quantity Per Inch: 11; Thread Series: UNIFIED NATIONAL COARSE (UNC). 13 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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