PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M1222N3X6C20GFNNNut,plain,hexagon

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5310-01-265-8957 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-265-8957 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-265-8957. Primary manufacturer part number: M1222N3X6C20GFNN.
Features
  • Nut,plain,hexagon — FSC 5310
  • Nut Height: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
  • Thread Quantity Per Inch: 14
  • Bearing Surface Type: WASHER FACED OR CHAMFERED
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Nominal Thread Size: 0.438 INCHES IN
  • Hardness Rating: 23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
  • Thread Direction: RIGHT-HAND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1013 or Steel Comp 1015 or Steel Comp 1016 or Steel Comp 1017 or Steel Comp 1018 or Steel Comp 1019 or Steel Comp 1020 or Steel Comp 1021 or Steel Comp 1022 or Steel Comp 1023 or Steel Comp 1524 or Steel Comp 1025 or Steel Comp 1026 or Steel Comp 1527 or Steel Comp 1029 or Steel Comp 1030 or Steel Comp 1033 or Steel Comp 1034 or Steel Comp 1035 or Steel Comp 1536 or Steel Comp 1037 or Steel Comp 1038 or Steel Comp 1039 or Steel Comp 1040 or Steel Comp 1541 Overall construction
General Description

The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-265-8957, 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 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-265-8957
Primary Part NumberM1222N3X6C20GFNN
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
Nut Height0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
Thread Quantity Per Inch14
Bearing Surface TypeWASHER FACED OR CHAMFERED
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Nominal Thread Size0.438 INCHES IN
Hardness Rating23.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM
Thread DirectionRIGHT-HAND
Nut StyleHEXAGON
Width Across Flats0.675 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
Thread Class2B
MaterialSTEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1023 OR STEEL COMP 1524 OR STEEL COMP 1025 OR STEEL COMP 1026 OR STEEL COMP 1527 OR STEEL COMP 1029 OR STEEL COMP 1030 OR STEEL COMP 1033 OR STEEL COMP 1034 OR STEEL COMP 1035 OR STEEL COMP 1536 OR STEEL COMP 1037 OR STEEL COMP 1038 OR STEEL COMP 1039 OR STEEL COMP 1040 OR STEEL COMP 1541 OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5310-00-639-1054 INTERCHANGEABLE
Nut,plain,hexagon
5310-00-880-7744 INTERCHANGEABLE
Nut,plain,hexagon
5310-01-466-409288-22790-5 INTERCHANGEABLE
Nut,plain,hexagon
Department of Defense Project Manager-Mobile Electric Power
5310-01-680-3675AEN04CA25000AZ5AJ1 INTERCHANGEABLE
Nut,plain,hexagon
The American Society of Mechanical Engineers
5310-01-680-8686AEN04C250000WA6M31 INTERCHANGEABLE
Nut,plain,hexagon
The American Society of Mechanical Engineers
Cross-Reference Index
Part NumberManufacturer
M1222N3X6C20GFNN Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M122N3X6C20CFNN Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
ANSI B18.2.2 American National Standards Institute Incorporated Dba American National Standards Institute (USA)
MIL-S-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5310-00-639-1054INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-00-880-7744INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-01-466-4092INTERCHANGEABLE
NUT,PLAIN,HEXAGON
88-22790-5
5310-01-680-3675INTERCHANGEABLE
NUT,PLAIN,HEXAGON
AEN04CA25000AZ5AJ1
5310-01-680-8686INTERCHANGEABLE
NUT,PLAIN,HEXAGON
AEN04C250000WA6M31

Frequently Asked Questions

What is NSN 5310-01-265-8957?

NSN 5310-01-265-8957 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 5310-01-265-8957?

NSN 5310-01-265-8957 has 5 cross-referenced part numbers: M1222N3X6C20GFNN (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M122N3X6C20CFNN (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), ANSI B18.2.2 (American National Standards Institute Incorporated Dba American National Standards Institute), MIL-S-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5310-01-265-8957?

There are 5 known substitutes for 5310-01-265-8957: 5310-00-639-1054, 5310-00-880-7744, 5310-01-466-4092 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M1222N3X6C20GFNN?

Key specifications for M1222N3X6C20GFNN: Nut Height: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN; Thread Quantity Per Inch: 14; Bearing Surface Type: WASHER FACED OR CHAMFERED; Thread Series: UNIFIED NATIONAL COARSE (UNC). 11 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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