grease fitting: material:mild steel yellow zinc plated size:1/ ... 16",1/2" thread:UNF,NPT,SAE,BSPT,PTF Grease Fitting/Grease Nipple Material: mild steel, stainless steel, brass Angle ... type, hydraulic-type, button-head type, double-head type square-type, pin-type, ball-type and other special types Metric ... linear guides· hydraulic cylinders· drives· chains· axels · pumps grease fitting 1/4"-28UNF 45degree