RR-W-410 Wire Rope And StrandThis specification covers wire ropes and wire seizing strands see 6.1. This specification does not include all types, classes, constructions, and sizes of wire rope and strand that are commercially available, but it is intended to cover the more common types, classes, constructions, and sizes that are suitable for federal government use.

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RR-W-410G

3.13.3.4.2 Each strand shall have 1 fiber center, 12 wires in the inner layer and 12 wires in the outer layer. Wires in the inner layer shall be of one diameter. Wires in the outer layer shall be of one diameter. Each strand shall be fabricated in one operation.

3.13.4 Type III, marine (cables), class 4, 6 by 3 by 7 spring lay (see figure 32 for typical construction). Wire rope grade improved plow steel shall be in accordance with the requirements specified herein.

3.13.4.1 Wire rope shall have 1 core and 6 strands of 1 fiber center and 6 substrands (3 fiber and

3 steel) each, totaling 126 wires in the steel strands.

3.13.4.2 Each steel substrand shall be in accordance with 3.11.1. Each strand shall have 1 fiber center, 3 fiber substrands, and 3 steel substrands of 7 wires each, totaling 21 wires laid alternately.

3.13.4.3 Material. Material shall be carbon steel as specified (see 3.1).

3.13.4.3.1 Finish. Wire ropes shall be of zinc coated (galvanized) wire in accordance with

3.3.5.2.

3.13.4.3.2 Centers and cores. Centers and cores shall be fiber in accordance with 3.2.1. The alternate (main) fiber strands showing on the surface of the finished spring lay rope shall be made of either polypropylene fiber or a good quality hard fiber. A mixture of two or more kinds of hard fiber may be used.

3.13.4.3.2.1 Preservation and lubrication. Fiber parts shall be treated with a lubricating compound blended to give proper lubricity and water repellency. The materials used shall not accelerate deterioration of the fiber parts during storage or weathering of the spring lay rope, nor adversely affect its handling qualities or durability. This requirement is not applicable to polypropylene parts (see MIL-P-24216).

3.13.4.3.3 Fabrication. Wire rope shall be preformed in accordance with 3.4. This rope shall not be required to meet the requirement of 4.4.5.2.

3.13.4.3.4 Lay. Lay shall be of right regular lay in accordance with 3.4.4.1.

3.13.4.3.5 Dimensions, weight, and strength. Dimensions, weight, and strength requirements shall be as specified in table XXVII.

3.13.5 Type III, marine (cables), class 5, 6 by 3 by 19 spring lay. Wire rope grade improved plow steel shall be in accordance with the requirements specified herein.

3.13.5.1 Material. Material shall be carbon steel as specified (see 3.1).

3.13.5.1.1 Finish. Wire rope shall be coated as specified (see 3.3.5 and 6.2(w-1)).