Collar drill bushing DIN 172 form B, bore 20.5 mm, length 36 mm, collar 34 mm, hardened steel

This collar drill bushing guides drills and reamers of 20.5 mm diameter over an overall length of 36 mm. The 30 mm outside diameter sits in the press fit of the drill plate, while the 34 mm collar rests on the plate surface and takes up the feed force.

Benefits

• Bore 20.5 mm, ground and dimensionally accurate to DIN 172
• Collar 34 mm with 5.0 mm height for axial location
• Outside diameter 30 mm for the press fit in the drill plate
• Case-hardening steel, hardened to 740 ± 80 HV 10 and ground
• Overall length 36 mm in the medium series
• Form B to DIN 172, the bore is rounded on both sides and can be loaded from either end

Applications

It is typically fitted into the drill plates of jigs in mechanical engineering, contract manufacturing and mould making, where the same 20.5 mm hole is produced again and again in the same place.

Standard and material

The basis is DIN 172, form B, with a guiding bore of 20.5 mm. In form B the bore is rounded on the opposite side as well. The material is case-hardening steel, hardened to 740 ± 80 HV 10 and ground afterwards.