whats the best material to make some nipples from

[Tony-c]

trying to help a mate out with having some nipples made. About inch long overall, 2mm hole, .215 dia for cap, and threaded 1/4 bsf

any specific material best to use?

I have zero knowledge on black powder, but as its not really a pressure bearing part I didnt think it that important

[1066]

Well good ones are made from Beryllium copper, some are platinum lined and some Ampco, however they are also made of stainless or carbon steel.

Not really a high pressure problem but the gas jet is very erosive, it depends how much they will be used. They also need to withstand a repeated hammer blow and not round off when trying to remove them if they are a bit tight.

I think the thread is usually 1/4-28 UNF not 1/4 bsf 26tpi

[glevum]

Machining Beryllium Copper is very hazardous.

The dust can be deadly.

[andrew375]

I've made them from ordinary mild steel, for Enfields and revolvers. Worked fine, flash holes only slightly enlarged after close to a thousand rounds over 15 years or so. If you want to go for something better then a machinable stainless will be the way to go. Btw, nipples are a pain to make due to the number of machining stages. The critical feature is the cone, get it wrong by even a small amount and either the cap won't go on or it will simply fall off.