... : 180 degree Model :1/2 NPT Also have SAE,BSP etc. 1/2" NPT Pipe Thread Grease Fitting Description :Lubrication grease fitting / grease nipple can be used ... , machinery etc.We provide a full line to serve your industrial line , SAE,BSP,DIN,JIS,METRIC, UNF,UNC, Button type ... time, and the pressure supplied by the grease gun forces a small captive bearing ball in the nipple to move back against ...