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| Nominal size | D | J | K | Shortest nominal length to which dimension k applies | C | H | R | Y | P | Q | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic screw dia. | Hexagon socket size* | Key engagement | Cup, flat and oval point | Cone point | Dog point | Cup and flat point Diameter(except hexagon internal knurled and small cup point) | Hexagon cup point internal knurled and small cup point diameter | Oval point radius | Cone point angle(90° for these lenghts and over, 118° for shorter lenghts) | Half dog point | ||||||
| Diameter | length | |||||||||||||||
| Nom. | Min. | Max. | Min. | Max. | Min. | Nom. | Max. | Min. | Max. | Min. | ||||||
| 0 | 0.0600 | 0.028 | 0.022 | 1/16 | 3/32 | 3/32 | 0.033 | 0.027 | 0.032 | 0.027 | 0.046 | 5/64 | 0.040 | 0.037 | 0.07 | 0.013 |
| 1 | 0.0730 | 0.035 | 0.028 | 3/32 | 3/32 | 3/32 | 0.040 | 0.033 | 0.038 | 0.033 | 0.055 | 3/32 | 0.049 | 0.045 | 0.021 | 0.017 |
| 2 | 0.0860 | 0.035 | 0.028 | 3/32 | 1/8 | 1/8 | 0.047 | 0.039 | 0.043 | 0.038 | 0.062 | 7/64 | 0.057 | 0.053 | 0.024 | 0.020 |
| 3 | 0.0990 | 0.050 | 0.040 | 3/32 | 3/16 | 1/8 | 0.054 | 0.045 | 0.050 | 0.045 | 0.078 | 1/8 | 0.066 | 0.062 | 0.027 | 0.023 |
| 4 | 0.1120 | 0.050 | 0.040 | 1/8 | 3/16 | 1/8 | 0.061 | 0.051 | 0.056 | 0.051 | 0.084 | 5/32 | 0.075 | 0.070 | 0.030 | 0.026 |
| 5 | 0.1250 | 1/16 | 0.050 | 1/8 | 3/16 | 3/16 | 0.067 | 0.057 | 0.062 | 0.056 | 0.094 | 3/16 | 0.083 | 0.078 | 0.033 | 0.027 |
| 6 | 0.1380 | 1/16 | 0.050 | 3/16 | 3/16 | 3/16 | 0.074 | 0.064 | 0.069 | 0.062 | 0.109 | 3/16 | 0.092 | 0.087 | 0.038 | 0.032 |
| 8 | 0.1640 | 5/64 | 0.062 | 3/16 | 1/4 | 3/16 | 0.087 | 0.076 | 0.082 | 0.074 | 0.125 | 1/4 | 0.109 | 0.103 | 0.043 | 0.037 |
| 10 | 0.1900 | 3/32 | 0.075 | 3/16 | 1/4 | 1/4 | 0.102 | 0.088 | 0.095 | 0.086 | 0.141 | 1/4 | 0.127 | 0.12 | 0.049 | 0.041 |
| 1/4 | 0.2500 | 1/8 | 0.100 | 1/4 | 5/16 | 5/16 | 0.132 | 0.118 | 0.125 | 0.114 | 0.187 | 5/16 | 0.156 | 0.149 | 0.067 | 0.059 |
| 5/16 | 0.3125 | 5/32 | 0.125 | 5/16 | 7/16 | 3/8 | 0.172 | 0.156 | 0.156 | 0.144 | 0.234 | 3/8 | 0.203 | 0.195 | 0.082 | 0.074 |
| 3/8 | 0.3750 | 3/16 | 0.150 | 3/8 | 1/2 | 7/16 | 0.212 | 0.194 | 0.187 | 0.174 | 0.281 | 7/16 | 0.250 | 0.241 | 0.099 | 0.089 |
| 7/16 | 0.4375 | 7/32 | 0.175 | 7/16 | 5/8 | 1/2 | 0.252 | 0.232 | 0.218 | 0.204 | 0.328 | 1/2 | 0.297 | 0.287 | 0.114 | 0.104 |
| 1/2 | 0.5000 | 1/4 | 0.200 | 1/2 | 5/8 | 5/8 | 0.291 | 0.270 | 0.250 | 0.235 | 0.375 | 9/16 | 0.344 | 0.334 | 0.130 | 0.120 |
| 5/8 | 0.6250 | 5/16 | 0.250 | 5/8 | 7/8 | 3/4 | 0.371 | 0.347 | 0.312 | 0.295 | 0.469 | 3/4 | 0.469 | 0.456 | 0.164 | 0.148 |
| 3/4 | 0.7500 | 3/8 | 0.300 | 3/4 | 1 | 7/8 | 0.450 | 0.425 | 0.375 | 0.357 | 0.562 | 7/8 | 0.562 | 0.549 | 0.196 | 0.180 |
| 7/8 | 0.8750 | 1/2 | 0.400 | 7/8 | 1¼ | 1 | 0.530 | 0.502 | 0.437 | 0.418 | 0.656 | 1 | 0.656 | 0.642 | 0.227 | 0.211 |
| 1 | 1.0000 | 9/16 | 0.450 | 1 | 1¼ | 1¼ | 0.609 | 0.579 | 0.500 | 0.480 | 0.750 | 1⅛ | 0.750 | 0.734 | 0.260 | 0.240 |