General Information about Fasteners

Written by Matt Milbury. Posted in Fastener

A fastener is hardware that mechanically joins two or more objects together.  Looking for fastener datasheets? flange boltsStuds and Nuts fastening two flanges together


  • FSTNR - Fastener
  • ANTP - American National Taper Pipe
  • ANPT - Aeronautical National Pipe Taper
  • ANS - American National Standard replaced with UNS
  • BA - British Association
  • BSF - British Standard Fine
  • BSP - British Standard Pipe
  • BSW - British Standard Whitworth
  • ISO - International Organization for Standardization
  • NPT - National Pipe Thread Tapered Thread
  • NPTF - National Pipe Taper Fuel - Dryseal
  • UNS - Unified National Standard
  • USS - United States Standard
  • UTS - Unified Thread Standard

Fastener Types

  • Removable - these parts can be disconnected without damaging the fastener like nut and bolt.
  • Semi-permanent - these parts can be disconnected, but some damage can occurs to the fastener like a cotter pin.
  • Permanent - these parts will never be disassembled like rivets and welding.


  • ASME Standards
    • ASME B1.20.1 - Pipe Threads, General Purpose, Inch
    • ASME B1.20.3 - Dryseal Pipe Threads, Inch