PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MILB45912Bolt,machine

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5306-00-022-1940 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-022-1940 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-022-1940. Primary manufacturer part number: MILB45912.
Features
  • Bolt,machine — FSC 5306
  • Thread Class: 2A A
  • Head Style: HEXAGON
  • Minimum Tensile Strength: 95000 POUNDS PER SQUARE INCH LBS
  • Nominal Thread Diameter: 0.312 INCHES IN
  • Hardness Rating: 96.0 ROCKWELL B MINIMUM AND 104.0 ROCKWELL B MAXIMUM OVERALL
  • Material: STEEL COMP 1035 OVERALL
  • Material Document and Classification: QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1035 Overall construction
General Description

The Bolt,machine, cataloged under National Stock Number 5306-00-022-1940, is classified within Federal Supply Class 5306 (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 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 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
NSN5306-00-022-1940
Primary Part NumberMILB45912
Item NameBolt,machine
FSC / FSG5306 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Thread Class2A A
Head StyleHEXAGON
Minimum Tensile Strength95000 POUNDS PER SQUARE INCH LBS
Nominal Thread Diameter0.312 INCHES IN
Hardness Rating96.0 ROCKWELL B MINIMUM AND 104.0 ROCKWELL B MAXIMUM OVERALL
MaterialSTEEL COMP 1035 OVERALL
Material Document and ClassificationQQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Width Between Flats0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
Surface Treatment Document and ClassificationQQ-P-416,TY 1,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 1,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
Minimum Yield Strength85000 POUNDS PER SQUARE INCH LBS
Locking FeatureDISTORTIONS BEARING SURFACE OF HEAD
Thread Series DesignatorUNF
Features ProvidedFINISHED HEAD
Surface TreatmentCADMIUM OR ZINC OVERALL
Thread Quantity Per Inch24
Head Height0.188 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
Thread Length0.875 INCHES MINIMUM AND 1.062 INCHES MAXIMUM IN
Fastener Length1.218 INCHES MINIMUM AND 1.282 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
Bolt,machine
Bolt,machine
Bolt,machine
Bolt,machine
Bolt,machine
Cross-Reference Index
Part NumberManufacturer
MILB45912 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS35763-1021 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5306-00-543-4634SUCCESSOR
BOLT,MACHINE
5306-00-816-5991SUCCESSOR
BOLT,MACHINE
5306-00-905-1672SUCCESSOR
BOLT,MACHINE
5306-01-006-3879SUCCESSOR
BOLT,MACHINE
5306-01-020-6895SUCCESSOR
BOLT,MACHINE

Frequently Asked Questions

What is NSN 5306-00-022-1940?

NSN 5306-00-022-1940 is a Bolt,machine, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5306 (No Item Name Available). Status: active.

What are the part numbers for NSN 5306-00-022-1940?

NSN 5306-00-022-1940 has 2 cross-referenced part numbers: MILB45912 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS35763-1021 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5306-00-022-1940?

There are 5 known substitutes for 5306-00-022-1940: 5306-00-543-4634, 5306-00-816-5991, 5306-00-905-1672 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILB45912?

Key specifications for MILB45912: Thread Class: 2A A; Head Style: HEXAGON; Minimum Tensile Strength: 95000 POUNDS PER SQUARE INCH LBS; Nominal Thread Diameter: 0.312 INCHES IN. 19 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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