Collar drill bushing DIN 172 form A, bore 28 mm, length 56 mm, collar 46 mm, hardened steel

This collar drill bushing guides drills and reamers of 28 mm diameter over an overall length of 56 mm. The 42 mm outside diameter sits in the press fit of the drill plate, while the 46 mm collar rests on the plate surface and takes up the feed force.

Benefits

• Bore 28 mm, ground and dimensionally accurate to DIN 172
• Overall length 56 mm in the long series
• Outside diameter 42 mm for the press fit in the drill plate
• Collar 46 mm with 5.0 mm height for axial location
• Case-hardening steel, hardened to 740 ± 80 HV 10 and ground
• Form A to DIN 172, the bore is rounded on the collar side so the tool enters easily

Technical data

Applications

It is used wherever holes of 28 mm have to be produced without centre punching and without wandering, for example in jigs for series parts, in assembly gauges or in prototype work.

Standard and material

The design complies with DIN 172 form A. In form A the bore is rounded only on the side of the collar. The material is case-hardening steel, hardened to 740 ± 80 HV 10 and ground.