BS 1981 Hexagon Head Screws
| Nom. Size | Basic Dia. | Threads per Inch | Width Across | H'd Depth B Nut Thick. E | Wash. Face Dia. F | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Flats A | Corners C | |||||||||
| UNC | UNF | Max. | Min. | Max. | Max. | Min. | Max. | Min. | ||
| BS 1981 - #4 | 0.112 | 40 | … | 0.1875 | 0.1835 | 0.216 | 0.06 | 0.055 | 0.183 | 0.173 |
| BS 1981 - #6 | 0.138 | 32 | … | 0.25 | 0.245 | 0.289 | 0.08 | 0.074 | 0.245 | 0.235 |
| BS 1981 - #8 | 0.164 | 32 | … | 0.25 | 0.245 | 0.289 | 0.11 | 0.104 | 0.245 | 0.235 |
| BS 1981 - #10 | 0.19 | 24 c | 32 | 0.3125 | 0.3075 | 0.361 | 0.12 | 0.113 | 0.307 | 0.297 |
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