Structural Hex Bolts - American Made

American Made heavy hex structural bolts fall under The American Society of Mechanical Engineers’ (ASME) standard category “Fasteners for Use in Structural Applications”.  These bolts are for steel-to-steel structural joints in heavy construction applications.
The ASME standard covers heavy hex structural bolt dimensional specifications designated by ASME B18.2.6.  The chemical and mechanical specifications included in ASME B18.2.6 are governed by the American Society for Testing and Materials (ASTM) designated by ASTM F3125.  In 2016, ASTM F3125 replaced ASTM A325 and ASTM A490 which are now grades under the new ASTM F3125 Standard.  ASTM A325 and ASTM A490 are still widely used terms throughout the industry.

American Made Heavy Hex Structural Bolt Specifications

  • ASME B18.2.6 - Structural Bolt Dimensions
Body Diameter (E)
Bolt Length (L)
Head Height (H)
Radius of Fillet (R)
Thread Length (LT)
Transition Thread Length (Y)
Width Across Flats (F)
Width Across Corners (G)

  • ASTM F3125 - Chemical and Mechanical Requirements
  • ASTM A325 - Structural Bolts, Steel, Heat Treated, 120/105-ksi Minimum Tensile Strength
  • ASTM A490 - Structrual Bolts, Alloy Steel, Heat Treated, 150-ksi Minimum Tensile Strength

Nuts and washers used in a structural joint with heavy hex structural bolts must also meet appropriate standards.  Falling under ASME B18.2.6 dimensional standard, there are two chemical and mechanical designations for structural nuts; ASTM A563 and A194.  The chemical and mechanical designation for structural washers is ASTM F436.

How to Designate a American Made Heavy Hex Structural Bolt:

  • Product Name:  Heavy Hex Structural Bolts
  • Specification Standard:  ASME B18.2.6
  • Nominal Size (basic diameter):  1/2 or 0.500
  • Threads Per Inch:  13
  • Length:  1.00
  • Material (specification and type where applicable):  ASTM A325 Type 3, Plain
  • Protective Finish:  heavy hex structural bolts are supplied with an as-processed, plain finish unless otherwise indicate
  • Country of Origin:  USA
Heavy Hex Structural Bolt, ASME B18.2.6, 1/2-13x1, ASTM A325 Type 3, Plain, USA

Heavy hex structural bolts are identified by their head markings indicating ASTM A325 or ASTM A490.  In addition, the bolts show the source symbol of the manufacturer or entity responsible for conforming to all relevant standards.

Contact AALL AMERICAN Fasteners today for structural bolts and more

Request a quote or contact AALL AMERICAN Fastener to discuss your structural bolt requirements with our Certified Fastener Specialists.

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