PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MILB857TYPEACLASSCNut,plain,hexagon

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5310-00-188-7831 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-188-7831 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-188-7831. Primary manufacturer part number: MILB857TYPEACLASSC.
Features
  • Nut,plain,hexagon — FSC 5310
  • Thread Class: 2B
  • Thread Quantity Per Inch: 14
  • Thread Series: UNIFIED NATIONAL COARSE (UNC)
  • Nominal Thread Size: 0.438 INCHES IN
  • Bearing Surface Type: FLAT OR CHAMFERED
  • Material: STEEL OVERALL
  • Thread Direction: RIGHT-HAND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-188-7831, is classified within Federal Supply Class 5310 (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 10 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. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-188-7831
Primary Part NumberMILB857TYPEACLASSC
Item NameNut,plain,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Thread Class2B
Thread Quantity Per Inch14
Thread SeriesUNIFIED NATIONAL COARSE (UNC)
Nominal Thread Size0.438 INCHES IN
Bearing Surface TypeFLAT OR CHAMFERED
MaterialSTEEL OVERALL
Thread DirectionRIGHT-HAND
Nut Height0.359 INCHES NOMINAL IN
Width Across Flats0.728 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
Nut StyleHEXAGON
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5310-00-188-7833 INTERCHANGEABLE
Nut,plain,hexagon
5310-00-188-7834 INTERCHANGEABLE
Nut,plain,hexagon
5310-00-188-7836 INTERCHANGEABLE
Nut,plain,hexagon
5310-00-221-4845 INTERCHANGEABLE
Nut,plain,hexagon
5310-00-227-798943N6870 INTERCHANGEABLE
Nut,plain,hexagon
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5306-00-579-1469 INTERCHANGEABLE
Bolt,machine
5306-00-579-4948 INTERCHANGEABLE
Bolt,machine
5310-00-619-196174593A INTERCHANGEABLE
Nut,plain,hexagon
Air Products & Chemicals, Inc
Cross-Reference Index
Part NumberManufacturer
MILB857TYPEACLASSC Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5310-00-188-7833INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-00-188-7834INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-00-188-7836INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-00-221-4845INTERCHANGEABLE
NUT,PLAIN,HEXAGON
5310-00-227-7989INTERCHANGEABLE
NUT,PLAIN,HEXAGON
43N6870
5306-00-579-1469INTERCHANGEABLE
BOLT,MACHINE
5306-00-579-4948INTERCHANGEABLE
BOLT,MACHINE
5310-00-619-1961INTERCHANGEABLE
NUT,PLAIN,HEXAGON
74593A

Frequently Asked Questions

What is NSN 5310-00-188-7831?

NSN 5310-00-188-7831 is a Nut,plain,hexagon, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-188-7831?

NSN 5310-00-188-7831 has 1 cross-referenced part number: MILB857TYPEACLASSC (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5310-00-188-7831?

There are 8 known substitutes for 5310-00-188-7831: 5310-00-188-7833, 5310-00-188-7834, 5310-00-188-7836 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILB857TYPEACLASSC?

Key specifications for MILB857TYPEACLASSC: Thread Class: 2B; Thread Quantity Per Inch: 14; Thread Series: UNIFIED NATIONAL COARSE (UNC); Nominal Thread Size: 0.438 INCHES IN. 10 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com