Fastener Specifications

There are 3 private-sector standards writing bodies- ASTM, ASME, & SAE – which administer comprehensive programs to develop and publish engineering standards relating to inch series mechanical fasteners.

ASTM Fasteners, ASTM A193, ASTM A194, ASTM A490, ASTM A325, ASTM A320, ASTM A449, ASTM A490, ASTM F593, ASTM F1554, ASTM F3125
ASTM Fastener Specifications

ASTM, the American Society for Testing and Materials, was founded in 1898 and is a scientific and technical organization formed for the “development of standards on characteristics and performance of materials, products, systems, and services; and the promotion of related knowledge”.  ASTM is the largest source in the world of voluntary consensus standards and Fastener Specifications.

Bolt Specifications

  • ASTM A193 Alloy Steel and stainless steel bolting materials for high-temperature service.
  • ASTM A307     Carbon steel externally threaded standard fasteners
  • ASTM A320     Alloy steel and stainless steel fasteners for low-temperature service
  • ASTM A325     High strength structural steel bolts for connecting structural steel joints
  • ASTM A354     Quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners
  • ASTM A449     Quenched and tempered steel bolts and studs
  • ASTM A490     Heat treated steel structural bolts – 150 ksi tensile strength
  • ASTM F541     Alloy steel eye bolts
  • ASTM F593     Stainless steel bolts, hex cap screws, and stainless studs
  • ASTM F1554   Anchor Bolts – structural support for concrete foundations
  • ASTM F3125    Structural bolt specification to replace A325, A325M, A490, A490M, and F2280 specifications

Hex Nut Specifications

Plating and Coating Specifications

  • ASTM A153     Hot Dip Galvanizing for iron and steel hardware-fasteners
  • ASTM B695     Mechanically deposited zinc coatings on iron and steel hardware
  • ASTM F1941    Electrodeposited coatings on threaded fasteners (zinc plating)
  • ASTM F2329   Zinc coating & Hot dip galvanizing for metal hardware and fasteners

Flat Washer Specifications

  • ASTM F436     Hardened steel flat washers
  • ASTM F844     Unhardened flat washers (for general use)
  • ASTM F2437   Compressible washer / DTI – Direct Tension Indicators (diameters 1/4″ – 2-1/2″)
  • ASTM F959     Compressible washer / DTI – Direct Tension Indicators (diameters 1/2″ – 1-1/2″)


SAE J429, SAE J-429, Fasteners, bolts, hex cap screws, grade 5, grade 8 gr5, gr8SAE Fastener Specifications

The SAE (Society of Automotive Engineers) is a professional engineering society which promotes the arts, sciences, standards, and engineering practices connected with the design, construction and utilization of self-propelled mechanisms, prime movers, their components, and related equipment.

SAE J429     Mechanical and material requirements for externally threaded fasteners (ex. Grade 5 and Grade 8 hex cap screws)

SAE J995     Mechanical and material requirements for steel nuts


Fastener Definitions

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