Headed drill bushes, DIN 172
Drill bushes
Headed drill bushes to DIN 172 guide drills and reamers in drilling jigs, templates and gauges, the collar resting on the face of the jig plate. This category holds 1116 versions with bore diameters from 9.9 to 19.5 mm, lengths from 12 to 36 mm and collar diameters from 18 to 34 mm, all in hardened case-hardening steel.
Selection follows the bore diameter, the body length and the collar diameter, which defines the bearing face on the plate. Body length is listed per bore diameter as short, medium or long. The bore is supplied as form A, rounded on one side, or as form B, rounded on both sides.
Headed drill bushes seat in drilling jigs used in tool and jig making, where the collar takes the feed force of the drill and fixes the fitting depth. They hold the cutting tool at a constant position during series drilling and limit bore wander. Form A, rounded on one side, suits a fixed fitting direction, while form B, rounded on both sides, allows the bush to go in either way round.
