Dr Jo
Well-Known Member
- Joined
- Nov 1, 2011
- Messages
- 166
- Reaction score
- 13
I have been making various small BA bolts and nuts over the last few weeks. One of the things that I keep having to do is to find the correct head height and calculate the correct allowance for the nut (nut height plus one and a half threads) on the end of the thread. So finally this morning I got around to entering the data into a table. If it is of any use to anyone else here goes:
BA Bolt and Nut Dimensions (in mm! ;D)
Size A/F Bolt Head Thickness Nut Thickness Nut allowance on stud
16 1.4 0.8 0.94 1.32
14 1.75 0.9 1.1 1.45
12 2.3 1.0 1.22 1.64
11 2.62 1.1 1.42 1.89
10 2.97 1.3 1.62 2.15
9 3.32 1.42 1.78 2.37
8 3.86 1.67 2.08 2.73
7 4.36 1.87 2.38 3.1
6 4.87 2.1 2.67 3.47
5 5.59 2.39 3.05 3.94
4 6.3 2.67 3.43 4.42
3 7.16 3.07 3.89 4.99
2 8.22 3.5 4.24 5.46
1 9.27 3.94 4.77 6.12
0 10.5 4.35 5.41 6.91
I have also taken a series of photos of making my last batch of 12BA stainless bolts if anyone is interested.
Jo
BA Bolt and Nut Dimensions (in mm! ;D)
Size A/F Bolt Head Thickness Nut Thickness Nut allowance on stud
16 1.4 0.8 0.94 1.32
14 1.75 0.9 1.1 1.45
12 2.3 1.0 1.22 1.64
11 2.62 1.1 1.42 1.89
10 2.97 1.3 1.62 2.15
9 3.32 1.42 1.78 2.37
8 3.86 1.67 2.08 2.73
7 4.36 1.87 2.38 3.1
6 4.87 2.1 2.67 3.47
5 5.59 2.39 3.05 3.94
4 6.3 2.67 3.43 4.42
3 7.16 3.07 3.89 4.99
2 8.22 3.5 4.24 5.46
1 9.27 3.94 4.77 6.12
0 10.5 4.35 5.41 6.91
I have also taken a series of photos of making my last batch of 12BA stainless bolts if anyone is interested.
Jo