ASTM A121-2019 pdf free download
ASTM A121-2019 pdf free download.Standard Specification for Metallic-Coated Carbon Steel Barbed Wire
1. Scope
1.1 This specification covers metallic-coated steel barbed wire, consisting of a strand of two wires. 1.2 The barbed wire is available with aluminum, zinc, and zinc-5 % aluminum-mischmetal alloy coatings, with a number of coating weights, in a number of different constructions (designs), and in two grades. Not all designs are available in all coating types. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 The text of this specification references notes and footnotes that provide explanatory information. These notes and footnotes (excluding those in tables) shall not be consid- ered as requirements of the specification. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
6. Material
6.1 Base Metal—The base metal of the steel strand wires and steel barbs shall be of good commercial quality carbon steel, capable of meeting the breaking strength requirement in 7.7. The base metal for aluminum barbs (permitted with metallic Coating Type A) shall be aluminum alloy wire conforming to Alloy 5000-H38, Alloy 6061-T94, or equal. 6.1.1 For Coating TypeAbarbed wire, the choice ofwhether aluminum-coated steel wire or aluminum alloy wire for the barbs shall be that of the manufacturer, unless otherwise specified by the purchaser. If aluminum alloy wire is used, the particular alloy shall be agreed upon between the manufacturer and the purchaser at the time the order is placed. 6.2 Coating Materials—The coating on the wire shall con- form with the requirements of the following specifications: 6.2.1 Coating Type A—Aluminum-coated wire in accor- dance with Specification A809. 6.2.2 Coating Type Z—Zinc-coated wire in accordance with Specification A641/A641M. 6.2.3 Coating Type ZA—Zinc-5 % aluminum-mischmetal alloy (Zn-5Al-MM) coated wire in accordance with Specifica- tion A856/A856M. 6.3 Coated Wire—The steel wire shall be coated before fabrication. 6.3.1 Weight of Coating Requirements for Strand Wires— The strand wires for Types Z and ZA barbed wire, as represented by the test specimens, shall conform to the requirements of Tables 2 and 3 respectively for the minimum coating weight for the type and class ordered. The strand wires for Type A barbed wire, as represented by the test specimens, shall have a minimum coating weight of 0.30 oz/ft 2 (90 g/m 2 ) on the 12 1 ⁄ 2 –gauge wire.6.3.2 Weight ofCoating Requirements for Barbs—The wire for barbs for Types Z and ZA barbed wire, as represented by the test specimens, shall conform to the same coating class requirements as the strand wire. The steel wire for barbs for Type A barbed wire, as represented by the test specimens, shall have a minimum coating weight of0.25 oz/ft 2 (75 g/m 2 ) on the 14–gauge wire.
7. General Requirements
7.1 The sizes and constructions for barbed wire furnished under this specification shall be in accordance with the requirements ofTable 1 for the Design Number specified in the order, within the tolerances stated in Section 8. 7.2 The barbs shall be sharp, well-formed, and tightly wrapped. The barb points shall be sharp and properly shaped. 7.3 The strand wires shall be twisted with a uniform length of lay. Type Z and Type ZA barbed wire shall have the twisting consistently in one direction (left or right) or alternating between the left and right directions. Type A barbed wire shall have the twisting consistently in either the left or right direction, with alternating of the twisting prohibited.
