Material | Internal hardness | Heat treatment |
20cr | HRC602° ±2° | Nitriding |
Size | d | d1 | D | H | 攻牙费牙只M | ||
Size | Tolerances | Size | Tolerances | ||||
12 | 12 | -0.015 -0.025 | 12 | +0.018 +0.010 | 17 | 6 | 5 yuan / piece |
16 | 16 | 16 | 20 | ||||
20 | 20 | -0.020 -0.033 | 20 | +0.023 +0.013 | 25 | ||
25 | 25 | 25 | 30 | 8 | |||
30 | 30 | 30 | 35 | ||||
35 | 35 | -0.025 -0.040 | 35 | +0.025 +0.015 | 40 | ||
40 | 40 | 40 | 45 | 10 | 8 yuan / piece | ||
45 | 45 | 45 | 50 | ||||
50 | 50 | 50 | 56 | 12 | |||
55 | 55 | -0.040 -0.055 | 55 | +0.030 +0.018 | 61 | 10yuan / piece | |
60 | 60 | 60 | 66 | 15 | |||
70 | 70 | 70 | 76 | 12 yuan / piece | |||
80 | 80 | 80 | 86 | ||||
90 | 90 | 90 | +0.035 +0.020 | 96 | 20 yuan / piece | ||
100 | 100 | 100 | 106 |