PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MILB857Bolt,machine

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5306-00-174-9617 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-174-9617 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-174-9617. Primary manufacturer part number: MILB857.
Features
  • Bolt,machine — FSC 5306
  • Head Style: HEXAGON
  • Thread Direction: RIGHT-HAND
  • Fastener Length: 2.000 INCHES NOMINAL IN
  • Features Provided: UNFINISHED HEAD
  • Material: STEEL OVERALL
  • Thread Class: 2A A
  • Hardness Rating: 95.0 ROCKWELL B MAXIMUM OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Bolt,machine, cataloged under National Stock Number 5306-00-174-9617, 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 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, 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
NSN5306-00-174-9617
Primary Part NumberMILB857
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
Head StyleHEXAGON
Thread DirectionRIGHT-HAND
Fastener Length2.000 INCHES NOMINAL IN
Features ProvidedUNFINISHED HEAD
MaterialSTEEL OVERALL
Thread Class2A A
Hardness Rating95.0 ROCKWELL B MAXIMUM OVERALL
Head Height0.302 INCHES MINIMUM AND 0.364 INCHES MAXIMUM IN
Grip Length0.750 INCHES NOMINAL IN
Nominal Thread Diameter0.500 INCHES IN
Width Between Flats0.725 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Nondefinitive Spec/std Data1 TYPE AND 1 GRADE
Minimum Tensile Strength55000 POUNDS PER SQUARE INCH LBS
Thread Quantity Per Inch13
Thread Length1.250 INCHES MINIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
Bolt,square Neck
5306-00-226-4835MS90725-42 SUCCESSOR
Bolt,machine
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-226-4839AEB02C312C50WA6AA1 SUCCESSOR
Bolt,machine
The American Society of Mechanical Engineers
Bolt,machine
Bolt,machine
Bolt,machine
Bolt,machine
5306-00-404-1385MS35751-54 SUCCESSOR
Bolt,square Neck
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-550-5030MS35355-145 SUCCESSOR
Bolt,machine
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5306-00-721-588769470 SUCCESSOR
Bolt,machine
Cummins Inc.
Cross-Reference Index
Part NumberManufacturer
MILB857 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5306-00-089-1425SUCCESSOR
BOLT,SQUARE NECK
5306-00-226-4835SUCCESSOR
BOLT,MACHINE
MS90725-42
5306-00-226-4839SUCCESSOR
BOLT,MACHINE
AEB02C312C50WA6AA1
5306-00-227-0610SUCCESSOR
BOLT,MACHINE
5306-00-299-2339SUCCESSOR
BOLT,MACHINE
5306-00-299-2380SUCCESSOR
BOLT,MACHINE
5306-00-379-4569SUCCESSOR
BOLT,MACHINE
5306-00-404-1385SUCCESSOR
BOLT,SQUARE NECK
MS35751-54
5306-00-550-5030SUCCESSOR
BOLT,MACHINE
MS35355-145
5306-00-721-5887SUCCESSOR
BOLT,MACHINE
69470
5306-00-068-0373SUCCESSOR
BOLT,MACHINE
5486612 ITEM 23
5306-00-174-9479SUCCESSOR
BOLT,MACHINE

Frequently Asked Questions

What is NSN 5306-00-174-9617?

NSN 5306-00-174-9617 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 5306-00-174-9617?

NSN 5306-00-174-9617 has 1 cross-referenced part number: MILB857 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5306-00-174-9617?

There are 12 known substitutes for 5306-00-174-9617: 5306-00-089-1425, 5306-00-226-4835, 5306-00-226-4839 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILB857?

Key specifications for MILB857: Head Style: HEXAGON; Thread Direction: RIGHT-HAND; Fastener Length: 2.000 INCHES NOMINAL IN; Features Provided: UNFINISHED HEAD. 16 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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