... steel yellow zinc plated size:1/4",1/8",5/16",3/8",7/16",1/2" thread:UNF,NPT,SAE,BSPT,PTF Grease Fitting ... .25,M10x1.5 Inch size: 1/4",1/8",1/16",3/8",1/2",5/16",7/16" BSPT,NPT,UNF,UNC,SAE thread standard ... · linear guides· hydraulic cylinders· drives· chains· axels · pumps grease fitting 1/4"-28UNF 45degree