RR-W-410G
3.2.4 Centers for wire strands. Centers in wire strands shall be either of a twisted fibrous material, or a single wire as outlined in the specific strand construction description. When this wire becomes so large (manufacturer's discretion) that it is considered undesirable, a 7 wire strand is allowed to replace it, as specified (see 6.2(d)). This 7 wire strand center shall not increase the number of stranding operations of the main strand or the number of wires in the main strand wire count. Fiber centers for wire strands shall be as specified in 3.2.1.
3.2.5 Other material for cores and centers. When specified (see 6.2(e)), glass fibers, plastic fibers, twisted and waxed kraft paper, spiral springs, or flexible plastic rods may be used in wire rope cores and wire strand centers.
3.3 Mechanical properties (see 3.9).
3.3.1 Tensile strength.
3.3.1.1 Wire ropes. Wire ropes covered in this specification shall meet or exceed the minimum breaking strength (force) requirements specified in the applicable table and/or
ASTM A1023/A1023M.
3.3.1.2 Main wires (load carrying). Where applicable, main wires in the main strands shall conform with the tensile strength requirements shown in table I or ASTM A1023/A1023M.
3.3.1.3 Galvanized wires. When drawn galvanized wire is ordered, it shall conform to the tensile requirements for bright (uncoated) steel wire specified in ASTM A1023/A1023M. The weight of zinc coating shall conform to the requirements shown in ASTM A1023/A1023M.
3.3.2 Torsion. Where applicable, main wires in the main strands, either bright (uncoated) or galvanized, shall conform to the minimum torsion requirements shown in ASTM A1023/A1023M.
3.3.3 Wrapping.
3.3.3.1 Rope wires of iron and steel grades, zinc coated (galvanized) at finished size. Rope wires of iron and steel wire rope grades, zinc coated at finished size, shall withstand wrapping in a close helix for six complete turns around a mandrel, followed by unwrapping without breakage or fracture of the wire. For zinc coated iron wires, the mandrel shall be the same diameter as the wire. For zinc coated steel wires, the mandrel shall be two times the diameter of the wire.
3.3.3.2 Rope wires of uncoated iron and phosphor bronze wire rope grades. Rope wires of uncoated iron and phosphor bronze wire rope grades shall withstand wrapping in a close helix for six complete turns around a mandrel having a diameter the same as the wire.
3.3.4 Pre-stretched wire rope. When specified (see 6.2(f)), the wire rope shall be pre-stretched in accordance with ASTM A1023/A1023M.
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