Making machine elements

BPERFORMING OPERATIONS TRANSPORTING B21Mechanical metalworking B21KMAKING FORGED OR PRESSED METAL PRODUCTS

B21K1/00Making machine elements

B21K1/02balls, rolls, or rollers B21K1/025of bullets B21K1/04ball-races or sliding bearing races B21K1/05cages for bearings B21K1/06axles or shafts B21K1/063hollow B21K1/066splined B21K1/08crankshafts B21K1/10of cylindrical form B21K1/12of specially-shaped cross-section B21K1/14fittings B21K1/16parts of pipe or hose couplings B21K1/18pistons or plungers B21K1/185with cooling channels B21K1/20valve parts B21K1/205rocker arms B21K1/22poppet valves B21K1/24valve bodies valve seats B21K1/26housings or supporting parts B21K1/28wheels discs B21K1/30with gear-teeth B21K1/305helical B21K1/32discs B21K1/34wheels with spokes B21K1/36with blades B21K1/38rims tyres B21K1/40hubs B21K1/42pulleys B21K1/44bolts, studs, or the like B21K1/46with heads B21K1/463with recessed heads B21K1/466Heading machines with an oscillating die block B21K1/48Machines working with hammers B21K1/50Trimming or shearing formed heads B21K1/52double-ended B21K1/54with grooves or notches B21K1/56screw-threaded elements B21K1/58rivets B21K1/60hollow or semi-hollow rivets B21K1/62special rivets B21K1/64nuts B21K1/66form strip bars B21K1/68from round or profiled bars B21K1/70of special shape B21K1/701Weld nuts B21K1/702Clinch nuts B21K1/704Cap nuts B21K1/705Castellated nuts B21K1/707Self-locking nuts B21K1/708wing nuts B21K1/72hooks B21K1/74forked members or members with two or more limbs B21K1/76elements not mentioned in one of the preceding groups B21K1/761rings B21K1/762Coupling members for conveying mechanical motion B21K1/763Inner elements of coupling members B21K1/765Outer elements of coupling members B21K1/766Connecting rods B21K1/767Toothed racks B21K1/768hollow