A-A-51131A
TABLE III. Bushing size for shaper extension holder and dimensions.
|
Bushing Size |
Outside work diameter; inches |
Inside work diameter; inches |
Length of bushing; inches |
|
|
Min. |
Max. |
|||
|
10 |
3/4 |
1/2 |
1-3/4 |
1-7/8 |
|
11 |
3/4 |
5/8 |
1-3/4 |
1-7/8 |
|
12 |
15/16 |
1/2 |
2-3/16 |
2-5/16 |
|
13 |
15/16 |
5/8 |
2-3/16 |
2-5/16 |
|
14 |
15/16 |
3/4 |
2-3/16 |
2-5/16 |
|
20 |
1-1/8 |
1/2 |
2-5/8 |
2-3/4 |
|
21 |
1-1/8 |
5/8 |
2-5/8 |
2-3/4 |
|
22 |
1-1/8 |
3/4 |
2-5/8 |
2-3/4 |
|
23 |
1-1/8 |
15/16 |
2-5/8 |
2-3/4 |
2. APPLICABLE DOCUMENTS.
2.1 Documents. The following documents of the issue in effect on the date of invitation for bids or request for proposals form a part of this description to the extent specified herein.
Federal Specification PPP-P-40- Preservation and Packing of Hand Tools and Tool Accessories for Power Driven, Metal and Woodworking Machinery.
Federal Standard FED-STD-376- Preferred Metric Units for General Use by the Federal Government.
American Society for Testing and Materials ASTM D 3951- Standard Practice for Commercial Packaging.
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 requirements specified herein and conform to current industrial practice.
3.2 Materials and hardness. The body shall have an integral shank and a bar holding head, shall be of drop-forged alloy steel, heat-treated to a Rockwell “C” 25 to 34 hardness on the head, or alloy steel surface hardened to a Rockwell “C” 50 to 55 on the shank and 40 to 50 on the head.
3.3 Bar holding head. The head shall be split spring section style to provide an adjustable support for the extension bar.
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