Whitworth to B.S. 190: 1924 Bright Hex Bolts |
|||||||||
| Nominal Thread Size | Across Flats Dimension | Thickness | Length of Thread | ||||||
| Head | Ordinary Nut | Lock Nut | |||||||
| Max | Min | Max | Min | Max | Min | Max | Min | (Minimum) | |
| 1/4" | 0.525" | 0.520" | 0.22" | 0.21" | 0.250" | 0.240" | 0.166" | 0.156" | 0.500" |
| 5/16" | 0.600" | 0.595" | 0.27" | 0.26" | 0.312" | 0.302" | 0.208 | 0.198" | 0.625" |
| 3/8" | 0.710" | 0.705" | 0.33" | 0.32" | 0.375" | 0.365" | 0.250" | 0.240" | 0.750" |
| 7/16" | 0.820" | 0.815" | 0.38" | 0.37" | 0.437" | 0.427" | 0.291" | 0.281" | 0.875" |
| 1/2" | 0.920" | 0.915" | 0.44" | 0.43" | 0.500" | 0.490" | 0.333" | 0.323" | 1.00" |
| 9/16" | 1.010" | 1.002" | 0.49" | 0.48" | 0.562" | 0.552" | 0.375" | 0.365" | 1.125" |
| 5/8" | 1.100" | 1.092" | 0.55" | 0.54" | 0.625" | 0.615" | 0.416" | 0.406" | 1.250" |
| 3/4" | 1.300" | 1.292" | 0.66" | 0.65" | 0.750" | 0.740" | 0.500" | 0.490" | 1.500" |
| 7/8" | 1.480" | 1.468" | 0.77" | 0.76" | 0.875" | 0.865" | 0.583" | 0.573" | 1.750" |
| 1.00" | 1.670" | 1.658" | 0.88" | 0.87" | 1.00" | 0.990" | 0.666" | 0.656" | 2.00" |
| 1-1/8" | 1.860" | 1.845" | 0.98" | 0.96" | 1.125" | 1.105" | 0.750" | 0.730" | 2.250" |
| 1-1/4" | 2.050" | 2.035" | 1.09" | 1.07" | 1.250" | 1.230" | 0.833" | 0.813" | 2.50" |
| 1-1/2" | 2.410" | 2.390" | 1.310" | 1.290" | 1.500" | 1.480" | 1.000" | 0.98" | 3.000" |
| 1-3/4" | 2.760" | 2.735" | 1.530" | 1.510" | 1.750" | 1.730" | 1.166" | 1.146" | 3.500" |
| 2" | 3.150" | 3.125" | 1.750" | 1.730" | 2.000" | 1.980" | 1.333" | 1.313" | 4.000" |
BSW to B.S. 1083: 1951 Bright Hex Bolts |
|||||||||
| Nominal Thread Size | Across Flats Dimension | Thickness | Length of Thread | ||||||
| Head | Ordinary Nut | Lock Nut | |||||||
| Max | Min | Max | Min | Max | Min | Max | Min | (Minimum) | |
| 1/4" | 0.445" | 0.438" | 0.19" | 0.18" | 0.200" | 0.190" | 0.133" | 0.123" | 1/2" |
| 5/16" | 0.525" | 0.518" | 0.22" | 0.21" | 0.250" | 0.240" | 0.166" | 0.156" | 5/8" |
| 3/8" | 0.600" | 0.592" | 0.27" | 0.26" | 0.312" | 0.302" | 0.208" | 0.198" | 3/4" |
| 7/16" | 0.710" | 0.702" | 0.33" | 0.32" | 0.375" | 0.365" | 0.250" | 0.240" | 7/8" |
| 1/2" | 0.820" | 0.812" | 0.38" | 0.37" | 0.437" | 0.427" | 0.291" | 0.281" | 1" |
| 9/16" | 0.920" | 0.912" | 0.44" | 0.43" | 0.500" | 0.490" | 0.333" | 0.323" | 1-1/8" |
| 5/8" | 1.010" | 1.000" | 0.49" | 0.48" | 0.562" | 0.552" | 0.375" | 0.365" | 1-1/4" |
| 3/4" | 1.200" | 1.190" | 0.60" | 0.59" | 0.687" | 0.677" | 0.458" | 0.448" | 1-1/2" |
| 7/8" | 1.300" | 1.288" | 0.66" | 0.65" | 0.750" | 0.740" | 0.500" | 0.490" | 1-3/4" |
| 1" | 1.480" | 1.468" | 0.77" | 0.76" | 0.875" | 0.865" | 0.583" | 0.573" | 2" |
| 1-1/8" | 1.670" | 1.658" | 0.88" | 0.87" | 1.000" | 0.990" | 0.666" | 0.656" | 2-1/4" |
| 1-1/4" | 1.860" | 1.845" | 0.98" | 0.96" | 1.125" | 1.105" | 0.750" | 0.730" | 2-1/2" |
| 1-3/8" | 2.050" | 2.035" | 1.09" | 1.07" | 1.250" | 1.230" | 0.833" | 0.813" | 2-3/4" |
| 1-1/2" | 2.220" | 2.200" | 1.200" | 1.180" | 1.375" | 1.355" | 0.916" | 0.896" | 3" |
| 1-3/4" | 2.580" | 2.555" | 1.420" | 1.400" | 1.625" | 1.605" | 1.083" | 1.063" | 3-1/2" |
| 2" | 2.760" | 2.735" | 1.530" | 1.510" | 1.750" | 1.730" | 1.166" | 1.146" | 4" |