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 5306-00-174-9546 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-174-9546 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-174-9546. Primary manufacturer part number: MILB857.
Features
  • Bolt,machine — FSC 5306
  • Thread Series Designator: UNIFIED NATIONAL COARSE (UNC)
  • Surface Treatment: ZINC OVERALL
  • Minimum Tensile Strength: 64000 POUNDS PER SQUARE INCH LBS
  • Nondefinitive Spec/std Data: 2,GR 2 TYPE
  • Surface Treatment Document and Classification: QQ-Z-325 TY 2,CL 2 FED SPEC 1ST TREATMENT RESPONSE OR ASTM A 153 ASSN STD 2ND TREATMENT RESPONSE OVERALL
  • Fastener Length: 9.000 INCHES NOMINAL IN
  • Head Height: 0.469 INCHES NOMINAL IN
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 5306-00-174-9546, 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 17 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5306-00-174-9546
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
StatusCANCELLED
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Surface TreatmentZINC OVERALL
Minimum Tensile Strength64000 POUNDS PER SQUARE INCH LBS
Nondefinitive Spec/std Data2,GR 2 TYPE
Surface Treatment Document and ClassificationQQ-Z-325 TY 2,CL 2 FED SPEC 1ST TREATMENT RESPONSE OR ASTM A 153 ASSN STD 2ND TREATMENT RESPONSE OVERALL
Fastener Length9.000 INCHES NOMINAL IN
Head Height0.469 INCHES NOMINAL IN
Features ProvidedFINISHED HEAD
Thread DirectionRIGHT-HAND
Head StyleHEXAGON
Thread Length2.000 INCHES MINIMUM IN
Thread Quantity Per Inch10
Width Between Flats1.088 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
Thread Class2A A
Nominal Thread Diameter0.750 INCHES IN
Hardness Rating100.0 ROCKWELL B NOMINAL OVERALL
MaterialSTEEL OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
No Item Name Available
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
Cross-Reference Index
Part NumberManufacturer
MILB857 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
FFB575TYPE3GRADE1 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
5306-00-660-2562SUCCESSOR
NO ITEM NAME AVAILABLE
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

Frequently Asked Questions

What is NSN 5306-00-174-9546?

NSN 5306-00-174-9546 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: cancelled.

What are the part numbers for NSN 5306-00-174-9546?

NSN 5306-00-174-9546 has 2 cross-referenced part numbers: MILB857 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), FFB575TYPE3GRADE1 (Federal Specifications Promulgated by General Services Administration Washington DC).

What NSN replaces 5306-00-174-9546?

There are 12 known substitutes for 5306-00-174-9546: 5306-00-660-2562, 5306-00-089-1425, 5306-00-226-4835 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILB857?

Key specifications for MILB857: Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Surface Treatment: ZINC OVERALL; Minimum Tensile Strength: 64000 POUNDS PER SQUARE INCH LBS; Nondefinitive Spec/std Data: 2,GR 2 TYPE. 17 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5306-00-174-9546 still in active supply?

NSN 5306-00-174-9546 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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