Arun Fasteners stock a range of BA (British Association) nuts and screws. We have now listed various BA nuts for sale on ebay.
www.ebay.co.uk/usr/arunfasteners
BA threads are used in miniature instruments and modelling and are popular in the model railway community. Somewhat opposite to other thread sizes, the largest is 0BA, up to the smallest we stock – 10BA.
Available – BA Brass Wing Nuts (packs of 25 nuts), available in 4BA
BA | Thread pitch | Outside diameter | Threads density | Outside diameter | Spanner | |
(mm) | (mm) | (in−1) | (in) | (mm) | (in) | |
0 | 1.00 | 6.00 | 25.40 | 0.2362 | 10.5000 | 0.4134 |
1 | 0.90 | 5.30 | 28.22 | 0.2087 | 9.2750 | 0.3652 |
2 | 0.81 | 4.70 | 31.36 | 0.1850 | 8.2250 | 0.3238 |
3 | 0.73 | 4.10 | 34.79 | 0.1614 | 7.1750 | 0.2825 |
4 | 0.66 | 3.60 | 38.48 | 0.1417 | 6.3000 | 0.2480 |
5 | 0.59 | 3.20 | 43.05 | 0.1260 | 5.6000 | 0.2205 |
6 | 0.53 | 2.80 | 47.92 | 0.1102 | 4.9000 | 0.1929 |
7 | 0.48 | 2.50 | 52.92 | 0.0984 | 4.3750 | 0.1722 |
8 | 0.43 | 2.20 | 59.07 | 0.0866 | 3.8500 | 0.1516 |
9 | 0.39 | 1.90 | 65.13 | 0.0748 | 3.3250 | 0.1309 |
10 | 0.35 | 1.70 | 72.57 | 0.0669 | 2.9750 | 0.1171 |