D. Of bolt | T. per inch | Daim at Botton of thread | Area of Bottom of thread | Width across flats | Width across corners | Thickness of bolt head | nut |
Ins. | Ins. | Ins. Sq. | Ins. | Ins. | Ins. | Ins. | |
1/4 | 20 | .1860 | .027 | .525 | .6062 | .2187 | 1/4 |
5/16 | 18 | .2414 | .046 | .6014 | .6944 | .2734 | 5/16 |
3/8 | 16 | .2950 | .068 | .7094 | .8191 | .3281 | 3/8 |
7/16 | 14 | .3460 | .094 | .8204 | .9473 | .3281 | 7/16 |
1/2 | 12 | .3933 | .121 | .9191 | 1.0612 | .4375 | 1/2 |
9/16 | 12 | .4558 | .164 | 1.011 | 1.1674 | .4921 | 9/16 |
5/8 | 11 | .5086 | .203 | 1.101 | 1.2713 | .5468 | 5/8 |
11/16 | 11 | .5611 | .256 | 1.2011 | 1.369 | .6015 | 11/16 |
3/4 | 10 | .6219 | .304 | 1.3012 | 1.5024 | .6562 | 3/4 |
13/16 | 10 | .8644 | .366 | 1.39 | 1.6050 | .7109 | 13/16 |
7/8 | 9 | .7327 | .422 | 1.4788 | 1.7075 | .7656 | 7/8 |
1 | 8 | .7399 | .554 | 1.6701 | 1.9284 | .875 |
WHITEWORTH STANDARD BOLTS AND NUTS
