ASTM A121:19 pdf download

ASTM A121:2019 pdf download.Standard Specification for Metallic-Coated Carbon Steel Barbed Wire.
5.2 All spools of barbed wire accepted by the purchaser shall be billed on the basis of the original length of the spools before sampling, unless changed by contractual agreement.
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 606 l-T94. or equal.
6.1.1 For Coating Type A barbed wire, the choice of whether 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 conform with the requirements of the following specifications:
6.2. 1 coating Type A—Aluminum-coated wire in accordance with Specification A809.
6.2.2 coating Type Z—Zinc-coated wire in accordance with Specification AM 1 /A64 1 M.
6.2.3 Coating Type ZA—Zinc—5 % aluminum—mi schmetal alloy (Zn-5A1-MM) coated wire in accordance with Specification 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/ft2 (90 g/m2) on the 12½ —gauge wire.
6.3.2 Weight of Coating 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 of 0.25 ozlft2 (75 gIm2) 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 of Table 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.