Lister 5/1 Diesel

Whitworth / BSF Hex Sizes

Old & New Standards


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"


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