what theads dose ARB use ?

years ago i had ARB lockers installed but the threads where british threads or something ,the mechanic could not find a tap for them so he used epoxy or something but oil use to leak from the whole . i am just wondering if im gonna have this same problem.

My ARB install manual shows it as being a 1/4" NPT pipe tap.

I am not sure where the oil would leak from? the only thing you need to tap is the bulkhead fitting and mine was 1/4" NPT. Yes arb uses BSP, or British Standard Pipe. Basically its either one more or one less thread per inch than that of NPT. Some say you can jam a BSP into a NPT and it will work. I choose to simply buy adapters for mine which are abialble through Weatherhead fittings. But these adapters were for the solinoid. Again, not sure where you need a tap that would cause and oil leak

The bulkhead fitting for the housing should be NPT the part the attaches to the fitting is the only BSP thread.

From Tim (who used to work at ARB):

Tech Tim said:

They are not BPT or BSP; they are 3/8-24UNF. Grab the double/double nipple from your kit, run down to the local hardware store and search through their 3/16" brass couplers 45,30,15 deg. You'll find once you strip the nuts and ferrules off the 3/16" couplers, they are the same as the straight male/male coupler you pulled from your ARB fittings.

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