Does anyone know what is the proper type of bolt to use with the six rivet clam shell housings? I think they are 5/16", but I want to know what thread, head size and length they should be.
Sept 1912 Parts and Price List calls out 7 ea. of p/n 2503D as Axle Housing bolt and nut, 5/16" x 1 7/8". Would be hex head and hex nut. Normally part of the shank under the hex not threaded.
There are earlier parts, 2503A , 2503B, 2503C, but all are shorter.
For most of 1910, the shorter of the bolts varied slightly in length depending on weather they had reinforcing and or washers as changes in design progressed. You need the length past the nut from a stock set and work it out from there. I could measure it from my original restored 1910 rear end for you if you still need help.