I have two very nice brass/metal fittings that need to be ... 3/8 BSP male to 1/4 NTP Female reducer. The fitting would work fine provided it is machined to the specifications it claims.

AutomationDirect’s NITRA line of pneumatics products now offers additional straight, branch, union, Y, reducer, elbow and bulkhead ... steel tube gripping claws; additional fittings with nickel-plated ...