A-A-51137B
3. SALIENT CHARACTERISTICS
3.1 Design. The tool holder shall be new and of the manufacturer's commercial design in effect on the date of the solicitation. The tool holder shall meet the criteria specified herein and conform to current industrial practice.
3.2 Materials and hardness. Type I shank mounted tool holders shall be of drop-forged alloy steel, heat-treated to a Rockwell "C" 40 to 52 hardness or alloy steel, and surface hardened to a Rockwell "C" 50 to 55 hardness. The type I, style C split clamp tool holder head shall be hardened to a Rockwell "C" 26 to 34 hardness. Type II T-slot mounted tool holders shall be of steel.
3.3 Tool holders. The tool holders covered herein are described as follows.
3.3.1 Type I, style A. The type I, style A reversible shank mounted boring and turning tool holders shall have a tool holding head grooved on top and bottom for supporting cutting tools with a swiveling yoke style clamping device. The shank shall be offset 45 degrees from the tool holding head. Dimensions of the tool holder shall conform to table I. Two solid boring tools, one square high speed tool steel bit, and a wrench to fit the clamp screw, shall be furnished with each tool holder. The boring tools shall conform to table VI for size specified.
3.3.2 Type I, style B. The type I, style B clamp block tool holder shall have a reversible clamp block to fasten boring bars to the tool holding head. One boring bar of the maximum size accommodated, a wrench to fit the clamp screws, and a wrench to fasten tool bits to the boring bar shall be furnished with each tool holder. Dimensions of the tool holder shall conform to table II.
3.3.3 Type I, style C. The type I, style C split clamp tool holders shall be furnished with one boring bar of the maximum size within the capacity of the tool holder. The boring bar may be a plain bar with two tool bits, a wrench to fit the clamp screw, and a wrench to fit the tool bit fastener devise. Dimensions of the tool holders shall conform to table III.
3.3.4 Type II, style A. The type II, style A adjustable height tool holder shall be furnished with an adjustable ring for height adjustment of boring tools. One boring bar of the maximum size within the capacity of the holder, two tool bits, a wrench to fit the clamp screw, and a wrench to fasten tool bits to the bar shall be furnished with each tool holder. Dimensions of the tool holders shall conform to table IV.
3.3.5 Type II, style B. The type II, style B fixed height tool holder shall accommodate three sizes of boring bars and shall be designed so that a slight turn of the clamp screw will secure or release both bar and holder. Three bars of appropriate size shall be furnished with each holder. A wrench to fit the clamp screw and a wrench to fasten tool bits to boring bars or a combination
wrench to fit both the clamp screw and tool bit fastener devices shall be furnished with each tool holder. The dimensions of the tool holders shall conform to table V.
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