Norma Astm A394

Designation: A 394 – 00

Standard Specification for

Steel Transmission Tower Bolts, Zinc-Coated and Bare1
This standard is issued under the fixed designation A 394; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.

and Type 2 bolts are zinc-coated Type 1 hardened-steel washers
that are in accordance with Specification F 436. Suitable
washers for use with Type 3 bolts are Type 3 hardened-steel
washers that are in accordance with Specification F 436.1.5 Nuts and washers that are supplied under this specification that are zinc coated shall be in accordance with 4.4.
1.6 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.

1. Scope *
1.1 This specification covers the chemical and mechanical
requirements of hexagon and square-head zinc-coated steel
bolts andatmospheric corrosion-resistant bolts, 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. The various types of bolts covered in this
specification are:
1.1.1 Type 0—Zinc-coated bolts made of low or medium
carbon steel.
1.1.2 Type 1—Zinc-coated bolts made of medium carbon
steel, quenched andtempered.
1.1.3 Type 2—Zinc-coated bolts made from what is generally described as low-carbon martensite steel, quenched and
tempered.
1.1.4 Type 3—Bare (uncoated), quenched and tempered
bolts made of steel having atmospheric corrosion-resistance
and weathering characteristics comparable to that of the steel
covered in Specifications A 242/A 242M, A 588/A 588M, and
A 709/A 709M. Theatmospheric corrosion resistance of these
steels is substantially better than that of carbon steel with or
without copper addition (see 5.4). When properly exposed to
the atmosphere, these steels can be used bare (uncoated) for
many applications.
1.1.5 For applications requiring improved low-temperature
characteristics, use of Types 1, 2, or 3 bolts is recommended.
1.2 Annex A1 of this specificationcovers zinc-coated steel
ladder bolts, step bolts, and support-equipment bolts.
1.3 Unless otherwise specified, all nuts used on these bolts
shall be hex style and conform to the requirements of Specification A 563 as follows:
Bolt Type

Nut Grade

0
1 and 2
3

A
DH
DH3

2. Referenced Documents
2.1 ASTM Standards:
A 90 Test Method for Weight of Coating on Zinc-Coated
(Galvanized)Iron or Steel Articles2
A 153 Specification for Zinc Coating (Hot-Dip) on Iron and
Steel Hardware2
A 242/A 242M Specification for High-Strength Low-Alloy
Structural Steel3
A 563 Specification for Carbon and Alloy Steel Nuts4
A 588/A 588M Specification for High-Strength Low-Alloy
Structural Steel with 50 ksi [345 MPa] Minimum Yield
Point to 4 in. [100 mm] Thick3
A 709/A 709M Specification forStructural Steel for
Bridges3
B 6 Specification for Zinc (Slab Zinc)5
B 244 Test Method for Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive
Coatings on Nonmagnetic Basis Metals with Eddy-Current
Instruments6
B 499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on
Magnetic Basis Metals6
B 695 Specification forCoatings of Zinc Mechanically
Deposited on Iron and Steel6
D 3951 Practice for Commercial Packaging7
F 436 Specification for Hardened Steel Washers4
F 606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners,

Finish
Zinc-coated
Zinc-coated
Plain

1.4 Suitable washers for use with Type 0 are zinc-coated
carbon-steel washers with...