A-A-51127
3.4 Knurls. The knurls shall be of tool steel hardened to a Rockwell “C” 63 to 67. Knurls shall be furnished in pairs in either diamond or straight line pattern, either coarse (14 teeth per inch), medium (21 teeth per inch), or fine (33 teeth per inch), either 45 degree bevel to depth of teeth or full face conforming to ANSI B94.6 with the styles in accordance with table III this description. One pair of style K-21-A knurls of the proper size in accordance with table I will be furnished with each type I tool holder unless otherwise specified in the contract. One pair of each style K-14-A, K-21-A, K-21-A and K-33-A of the proper size in accordance with table II shall be furnished with each type II tool holder unless otherwise specified in the contract.
TABLE III. Knurl style available.
|
Knurl Style |
Teeth per inch |
Bevel degree/ full face |
Knurl Pattern |
|
K-14-A |
14 |
45 degs. |
Diamond |
|
K-14-B |
14 |
45 degs. |
straight line |
|
K-14-C |
14 |
full face |
Diamond |
|
K-14-D |
14 |
full face |
straight line |
|
|
|
|
|
|
K-21-A |
21 |
45 degs. |
Diamond |
|
K-21-B |
21 |
45 degs. |
straight line |
|
K-21-C |
21 |
full face |
Diamond |
|
K-21-D |
21 |
full face |
straight line |
|
|
|
|
|
|
K-33-A |
33 |
45 degs. |
Diamond |
|
K-33-B |
33 |
45 degs. |
straight line |
|
K-33-C |
33 |
full face |
Diamond |
|
K-33-D |
33 |
full face |
straight line |
3.5 Measurement system. All dimensions in this description are given in US units. These dimensions may be converted to S1 units through the use of conversion factors and methods specified in FED-STD-376.
3.6 Regulatory requirements. In accordance with section 23.403 of the Federal Acquisition Regulations, the Governments policy is to acquire items composed of the highest percentage of recovered materials practicable, consistent with maintaining a satisfactory level of competition without adversely affecting performance requirements or exposing suppliers’ employees to undue hazards from the recovered materials.
3.7 Workmanship. Workmanship of the holder shall be of a quality equal to that of comparable products furnished to the commercial market.
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