ASTM A394 Type 0 is a standard material specification covering chemical and mechanical requirements of hexagon and square-head zinc-coated steel bolts made from low or medium carbon steel, in nominal thread diameters of 1⁄2, 5⁄8, 3⁄4, 7⁄8 and 1 in. for use in the construction of transmission towers, substations, and similar steel structures.

Find chemical composition, mechanical properties, shear strength, marking, recommended nuts, surface finish or coating and other reference standards for ASTM A394 Type 0 Bolts.

Chemical Composition

Element Grade Type 0
Carbon 0.55 max
Manganese, max ...
Phosphorus, max 0.048 max
Sulfur, max 0.058 max

Mechanical Properties

Nominal size, Inch. Minimum Tensile Load, lbf Hardness
Type 0 Type 0
1/2 10 500

80 – 100
Rockwell B
5/8 16 700
3/4 24 700
7/8 34 200
1 44 850

Recommended Nuts and Coating

Grade Nut Grade Coating
Type 0 A563 Grade A Hot Dip or Zinc Coating

Reference Standards

ASTM A563 Specification for Carbon and Alloy Steel Nuts
ASTM F436 Specification for Hardened Steel Washers
ASTM F2329 Specification for Zinc Coating, Hot-Dip
ASME B1.1 Unified Screw Threads
ASME B18.2.1 Square and Hex Bolts and Screws