PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

181591Bolt,machine

General Motors Corp · NSN 5306-00-018-1591 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-018-1591 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-018-1591. Primary manufacturer part number: 181591.
Features
  • Bolt,machine — FSC 5306
  • Head Height: 0.203 INCHES NOMINAL IN
  • Nominal Thread Diameter: 0.312 INCHES IN
  • Fastener Length: 0.500 INCHES NOMINAL IN
  • Width Between Flats: 0.500 INCHES NOMINAL IN
  • Surface Treatment: CADMIUM OR ZINC OVERALL
  • Material Document and Classification: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
  • Material: STEEL 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 5306-00-018-1591, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is General Motors Corp. Government technical data includes 15 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: Active.

Technical Specifications
ParameterValue
NSN5306-00-018-1591
Primary Part Number181591
Item NameBolt,machine
FSC / FSG5306 / 53 — No Item Name Available
ManufacturerGeneral Motors Corp
StatusACTIVE
Head Height0.203 INCHES NOMINAL IN
Nominal Thread Diameter0.312 INCHES IN
Fastener Length0.500 INCHES NOMINAL IN
Width Between Flats0.500 INCHES NOMINAL IN
Surface TreatmentCADMIUM OR ZINC OVERALL
Material Document and ClassificationSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MaterialSTEEL OVERALL
Hardness Rating23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
Thread Class2A A
Minimum Yield Strength85000 POUNDS PER SQUARE INCH LBS
Thread Series DesignatorUNF
Features ProvidedFINISHED HEAD
Thread Length0.500 INCHES MAXIMUM IN
Thread Quantity Per Inch24
Head StyleHEXAGON
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5315-00-032-1618181591 INTERCHANGEABLE
Pin,shoulder,headed
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
5998-00-488-0772 INTERCHANGEABLE
Circuit Card Assembly
3110-00-585-47796725 INTERCHANGEABLE
Bearing,ball,annular
Blako Inc. Dba Blakeslee
6910-00-809-6725800-6725 INTERCHANGEABLE
Moulage,war Wound
Nasco Healthcare Inc
2530-00-870-04456725 INTERCHANGEABLE
Valve,relay Emergen
Dorsey Trailers Inc
4810-01-129-560067-25 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives
5950-01-167-313718159-1 INTERCHANGEABLE
Coil,radio Frequency
Drs Signal Solutions, Inc.
6130-01-168-8001672-5 INTERCHANGEABLE
Power Supply
Astronics Advanced Electronic Systems Corp. Dba Astronics Advanced Electronic Systems
5999-01-199-9123 INTERCHANGEABLE
Mounting Pad,electrical-Electron
8010-01-298-66246725 INTERCHANGEABLE
Epoxy Primer Coating Kit
Cytec Engineered Materials Inc.
Cross-Reference Index
Part NumberManufacturer
181591 General Motors Corp (USA)
181591 General Motors Llc Dba General Motors Llc (USA)
6725 Fwd Seagrave Holdings Lp (USA)
Related Parts
5315-00-032-1618INTERCHANGEABLE
PIN,SHOULDER,HEADED
181591
5998-00-488-0772INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
3110-00-585-4779INTERCHANGEABLE
BEARING,BALL,ANNULAR
6725
6910-00-809-6725INTERCHANGEABLE
MOULAGE,WAR WOUND
800-6725
2530-00-870-0445INTERCHANGEABLE
VALVE,RELAY EMERGEN
6725
4810-01-129-5600INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
67-25
5950-01-167-3137INTERCHANGEABLE
COIL,RADIO FREQUENCY
18159-1
6130-01-168-8001INTERCHANGEABLE
POWER SUPPLY
672-5
5999-01-199-9123INTERCHANGEABLE
MOUNTING PAD,ELECTRICAL-ELECTRON
8010-01-298-6624INTERCHANGEABLE
EPOXY PRIMER COATING KIT
6725
6910-01-515-9722INTERCHANGEABLE
MOULAGE,WAR WOUND
6725
5325-01-684-9681INTERCHANGEABLE
RING,RETAINING

Frequently Asked Questions

What is NSN 5306-00-018-1591?

NSN 5306-00-018-1591 is a Bolt,machine, manufactured by General Motors Corp, classified under FSC 5306 (No Item Name Available). Status: active.

What are the part numbers for NSN 5306-00-018-1591?

NSN 5306-00-018-1591 has 3 cross-referenced part numbers: 181591 (General Motors Corp), 181591 (General Motors Llc Dba General Motors Llc), 6725 (Fwd Seagrave Holdings Lp).

What NSN replaces 5306-00-018-1591?

There are 12 known substitutes for 5306-00-018-1591: 5315-00-032-1618, 5998-00-488-0772, 3110-00-585-4779 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 181591?

Key specifications for 181591: Head Height: 0.203 INCHES NOMINAL IN; Nominal Thread Diameter: 0.312 INCHES IN; Fastener Length: 0.500 INCHES NOMINAL IN; Width Between Flats: 0.500 INCHES NOMINAL IN. 15 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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