Round Head Type U Metallic Drive Screws [Table 22]
BS 4174 - 1972 半圆头U型金属驱动（强攻）螺钉 [Table 22]
See all versions and complete specifications: Round Head Type U Metallic Drive Screws [Table 22] — Full Specification Page
| Size | P | e | r | k_max | k_min | s_max | s_min | ds_max | ds_min | k_nominal | ds_nominal |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0# | 2.95 | 0.112 | 0.116 | 5.36 | 4.90 | 2.84 | 2.44 | 1.90 | 7 | 2.34 | 2.18 |
| 2# | 3.91 | 0.150 | 0.154 | 7.24 | 6.70 | 3.81 | 3.20 | 2.51 | 8 | 3.10 | 2.82 |
| 4# | 4.62 | 0.177 | 0.182 | 9.12 | 8.48 | 4.50 | 3.81 | 3.12 | 8 | 3.71 | 3.48 |
| 6# | 6.15 | 0.236 | 0.242 | 11.61 | 10.90 |
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| 6.00 |
| 5.13 |
| 3.94 |
| 9 |
| 5.03 |
| 4.32 |
| 00# | 1.90 | 0.072 | 0.075 | 3.22 | 3.00 | 1.83 | 1.60 | 1.04 | 6 | 1.52 | 1.24 |
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