Making machine elements

Child Classifications

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• B21K 1/02 balls, rolls, or rollers, e.g. for bearings
• B21K 1/04 ball-races
• B21K 1/05 cages for bearings
• B21K 1/06 axles or shafts
• B21K 1/14 fittings
• B21K 1/18 pistons or plungers
• B21K 1/20 valve parts
• B21K 1/26 housings or supporting parts, e.g. axle housings, engine mountings
• B21K 1/28 wheels; discs
• B21K 1/44 bolts, studs, or the like (making screw-thread B21K1/56; making U-bolts B21K1/74)
• B21K 1/56 screw-threaded elements
• B21K 1/58 rivets
• B21K 1/64 nuts (making screw-thread B21K1/56)
• B21K 1/72 hooks, e.g. crane hooks, railway track spikes (making nails in general B21G)
• B21K 1/74 forked members or members with two or more limbs, e.g. U-bolts, anchors
• B21K 1/76 elements not mentioned in one of the preceding groups