BS 1083 Precision Hexagon Castle Nuts

BS 1083 Precision Hexagon Castle Nuts

Nominal Size D Number of Threads per Inch Thickness P Lower Face to Bottom of Slot H Slots
Width M Depth N
BSW BSF Max. Min. Max. Min. Max. Min. Approx.
BS 1083 - 1⁄4 20 26 0.2 0.19 0.17 0.16 0.1 0.09 0.09
BS 1083 - 5⁄16 18 22 0.25 0.24 0.19 0.18 0.1 0.09 0.09
BS 1083 - 3⁄8 16 20 0.312 0.302 0.222 0.212 0.1 0.09 0.09
BS 1083 - 7⁄16 14 18 0.375 0.365 0.235 0.225 0.135 0.125 0.14
BS 1083 - 1⁄2 12 16 0.437 0.427 0.297 0.287 0.135 0.125 0.14
BS 1083 - 9⁄16 12 16 0.5 0.49 0.313 0.303 0.175 0.165 0.187
BS 1083 - 5⁄8 11 14 0.562 0.552 0.375 0.365 0.175 0.165 0.187
BS 1083 - 3⁄4 10 12 0.687 0.677 0.453 0.443 0.218 0.208 0.234
BS 1083 - 7⁄8 9 11 0.75 0.74 0.516 0.506 0.218 0.208 0.234
BS 1083 - 1 8 10 0.875 0.865 0.595 0.585 0.26 0.25 0.28
BS 1083 - 11⁄8 7 9 1 0.99 0.72 0.71 0.26 0.25 0.28
BS 1083 - 11⁄4 7 9 1.125 1.105 0.797 0.777 0.3 0.29 0.328
BS 1083 - 13⁄8a ... 8 1.25 1.23 0.922 0.902 0.3 0.29 0.328
BS 1083 - 11⁄2 6 8 1.375 1.355 1.047 1.027 0.3 0.29 0.328
BS 1083 - 13⁄4 5 7 1.625 1.605 1.25 1.23 0.343 0.333 0.375
BS 1083 - 2 4.5 7 1.75 1.73 1.282 1.262 0.426 0.416 0.468
  • a Not standard with BSW thread. For widths across flats, widths across corners, and diameter of washer face see Table 1. For dimensional notation, see diagram on page 1571.
  • All dimensions in inches except where otherwise noted