• This specification is applicable to heavy hex structural bolts only.

  • The bolts are intended for use in structural connections. These connections are comparable to those covered under the requirements of the Specification for Structural Joints Using High-Strength Bolts, approved by the Research Council on Structural Connections; endorsed by the American Institute of Steel Construction and by the Industrial Fastener Institute.

  • The bolts are furnished in sizes 1⁄2 to 11⁄2 in., inclusive.
  • These high strength fasteners have atmospheric corrosion resistance and weathering properties. This means that Type 3 structural bolts are designed to weather and rust over time.
  • Type 3 is chemical composition is denoted by Weathering Steel.
  • A325 Type 3 Chemical Properties.

A, B, C, D, E, and F are classes of material used for Type 3 bolt. Selection of a class shall be the option of the bolt manufacturer.
#These element are not specified or required.

  • Type 3 bolts shall be quenched only in oil from the austenitizing temperature
  • Hardness-The bolts shall conform to the hardness specified is as followed
    1⁄2 to 1, incl- Max 35 HRC
    11⁄8 to 11⁄2, incl- Max 30 HRC.

  • The bolts shall conform to the dimensions for heavy hex structural bolts specified in ASME B18.2.6.
  • Tensile Strength Requirements for Specimens Machined from Bolts.