PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-DTL-1222Screw,cap,hexagon Head

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5305-00-299-2366 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-00-299-2366 — this item is cataloged by the U.S. Government under National Stock Number 5305-00-299-2366. Primary manufacturer part number: MIL-DTL-1222.
Features
  • Screw,cap,hexagon Head — FSC 5305
  • Thread Direction: RIGHT-HAND
  • Minimum Tensile Strength: 69000 POUNDS PER SQUARE INCH LBS
  • Hardness Rating: 23.0 ROCKWELL C MAXIMUM OVERALL
  • Material: STEEL OVERALL
  • Material Document and Classification: SAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
  • Nondefinitive Spec/std Data: 1 TYPE AND 2 GRADE
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC)
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-00-299-2366, is classified within Federal Supply Class 5305 (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 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5305-00-299-2366
Primary Part NumberMIL-DTL-1222
Item NameScrew,cap,hexagon Head
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusCANCELLED
Thread DirectionRIGHT-HAND
Minimum Tensile Strength69000 POUNDS PER SQUARE INCH LBS
Hardness Rating23.0 ROCKWELL C MAXIMUM OVERALL
MaterialSTEEL OVERALL
Material Document and ClassificationSAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Nondefinitive Spec/std Data1 TYPE AND 2 GRADE
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Surface Treatment Document and ClassificationQQ-Z-325,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Width Between Flats0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
Thread Length1.000 INCHES MAXIMUM IN
Fastener Length1.000 INCHES NOMINAL IN
Thread Quantity Per Inch16
Nominal Thread Diameter0.375 INCHES IN
Head Height0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
Surface TreatmentZINC OVERALL
Thread Class2A A
Head StyleHEXAGON
Features ProvidedFINISHED HEAD
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5306-00-174-9458 INTERCHANGEABLE
Bolt,machine
5305-00-174-9462 INTERCHANGEABLE
Screw,cap,hexagon Head
5306-00-174-9463 INTERCHANGEABLE
Bolt,machine
5306-00-174-9530 INTERCHANGEABLE
Bolt,machine
5306-00-272-5104 INTERCHANGEABLE
Bolt,machine
5306-00-275-9800280450PC252 INTERCHANGEABLE
Bolt,machine
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5306-00-281-3741 INTERCHANGEABLE
Bolt,machine
5306-00-299-2336 INTERCHANGEABLE
Bolt,machine
5306-00-299-2339 INTERCHANGEABLE
Bolt,machine
5306-00-299-2343 INTERCHANGEABLE
Bolt,machine
Cross-Reference Index
Part NumberManufacturer
MIL-DTL-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MILB857TYPE2GRADE2 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M1222RX6C216GCNZE Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
3H5841 Zf Industrieantriebe Witten Gmbh (DEU)
MIL-S-1222 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
FFB575 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5306-00-174-9458INTERCHANGEABLE
BOLT,MACHINE
5305-00-174-9462INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
5306-00-174-9463INTERCHANGEABLE
BOLT,MACHINE
5306-00-174-9530INTERCHANGEABLE
BOLT,MACHINE
5306-00-272-5104INTERCHANGEABLE
BOLT,MACHINE
5306-00-275-9800INTERCHANGEABLE
BOLT,MACHINE
280450PC252
5306-00-281-3741INTERCHANGEABLE
BOLT,MACHINE
5306-00-299-2336INTERCHANGEABLE
BOLT,MACHINE
5306-00-299-2339INTERCHANGEABLE
BOLT,MACHINE
5306-00-299-2343INTERCHANGEABLE
BOLT,MACHINE
5306-00-299-2368INTERCHANGEABLE
BOLT,MACHINE
5306-00-299-2380INTERCHANGEABLE
BOLT,MACHINE

Frequently Asked Questions

What is NSN 5305-00-299-2366?

NSN 5305-00-299-2366 is a Screw,cap,hexagon Head, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5305 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5305-00-299-2366?

NSN 5305-00-299-2366 has 6 cross-referenced part numbers: MIL-DTL-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MILB857TYPE2GRADE2 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M1222RX6C216GCNZE (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 3H5841 (Zf Industrieantriebe Witten Gmbh), MIL-S-1222 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M) and 1 more.

What NSN replaces 5305-00-299-2366?

There are 12 known substitutes for 5305-00-299-2366: 5306-00-174-9458, 5305-00-174-9462, 5306-00-174-9463 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-DTL-1222?

Key specifications for MIL-DTL-1222: Thread Direction: RIGHT-HAND; Minimum Tensile Strength: 69000 POUNDS PER SQUARE INCH LBS; Hardness Rating: 23.0 ROCKWELL C MAXIMUM OVERALL; Material: STEEL OVERALL. 18 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5305-00-299-2366 still in active supply?

NSN 5305-00-299-2366 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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