PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-S-1222HScrew,cap,hexagon Head

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5305-00-226-9220 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-00-226-9220 — this item is cataloged by the U.S. Government under National Stock Number 5305-00-226-9220. Primary manufacturer part number: MIL-S-1222H.
Features
  • Screw,cap,hexagon Head — FSC 5305
  • Fastener Length: 2.500 INCHES NOMINAL IN
  • Width Between Flats: 1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
  • Head Height: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
  • Thread Class: 2A A
  • Head Style: HEXAGON
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC)
  • Material: NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Nickel Alloy 400 or Nickel Alloy R-405 Overall construction
General Description

The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-00-226-9220, 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 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 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
NSN5305-00-226-9220
Primary Part NumberMIL-S-1222H
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
Fastener Length2.500 INCHES NOMINAL IN
Width Between Flats1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
Head Height0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN
Thread Class2A A
Head StyleHEXAGON
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
MaterialNICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL
Material Document and ClassificationQQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL
Thread Quantity Per Inch10
Thread DirectionRIGHT-HAND
Nominal Thread Diameter0.750 INCHES IN
Thread Length1.750 INCHES MINIMUM IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5306-00-227-0932 INTERCHANGEABLE
Bolt,machine
5307-00-248-7987 INTERCHANGEABLE
Stud,plain
5306-00-263-7479 INTERCHANGEABLE
Bolt,machine
5305-00-266-4105 INTERCHANGEABLE
Screw,cap,hexagon Head
5306-00-270-8290 INTERCHANGEABLE
Bolt,machine
5306-00-270-9456 INTERCHANGEABLE
Bolt,machine
5306-00-273-6098 INTERCHANGEABLE
Bolt,machine
5306-00-285-3532X04 INTERCHANGEABLE
Bolt,machine
Strong Forge & Fabrication, Llc
5306-00-338-3853K6643028PC217 INTERCHANGEABLE
Bolt,machine
General Electric Company
5306-00-551-5836 INTERCHANGEABLE
Bolt,machine
Cross-Reference Index
Part NumberManufacturer
MIL-S-1222H Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS35311-189 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
FF-S-85 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5306-00-227-0932INTERCHANGEABLE
BOLT,MACHINE
5307-00-248-7987INTERCHANGEABLE
STUD,PLAIN
5306-00-263-7479INTERCHANGEABLE
BOLT,MACHINE
5305-00-266-4105INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
5306-00-270-8290INTERCHANGEABLE
BOLT,MACHINE
5306-00-270-9456INTERCHANGEABLE
BOLT,MACHINE
5306-00-273-6098INTERCHANGEABLE
BOLT,MACHINE
5306-00-285-3532INTERCHANGEABLE
BOLT,MACHINE
X04
5306-00-338-3853INTERCHANGEABLE
BOLT,MACHINE
K6643028PC217
5306-00-551-5836INTERCHANGEABLE
BOLT,MACHINE
5307-00-990-6509INTERCHANGEABLE
STUD,CONTINUOUS THREAD
5306-01-028-3481INTERCHANGEABLE
BOLT,MACHINE

Frequently Asked Questions

What is NSN 5305-00-226-9220?

NSN 5305-00-226-9220 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 5305-00-226-9220?

NSN 5305-00-226-9220 has 3 cross-referenced part numbers: MIL-S-1222H (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS35311-189 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), FF-S-85 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 5305-00-226-9220?

There are 12 known substitutes for 5305-00-226-9220: 5306-00-227-0932, 5307-00-248-7987, 5306-00-263-7479 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-S-1222H?

Key specifications for MIL-S-1222H: Fastener Length: 2.500 INCHES NOMINAL IN; Width Between Flats: 1.100 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN; Head Height: 0.455 INCHES MINIMUM AND 0.483 INCHES MAXIMUM IN; Thread Class: 2A A. 12 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5305-00-226-9220 still in active supply?

NSN 5305-00-226-9220 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.
PartsTable Design LLC · partstable.com