Collar drill bushing form A to DIN 172, bore 7.8 x 16 mm, collar 15 mm, case-hardening steel

This bushing of the medium series guides drills of 7.8 mm diameter over 16 mm. The collar with 3.0 mm height stops the bushing from being pushed down through the holder during machining and sets its height clearly.

Benefits

• Bore 7.8 mm, ground and dimensionally accurate to DIN 172
• Collar 15 mm with 3.0 mm height for axial location
• Outside diameter 12 mm for the press fit in the drill plate
• Case-hardening steel, hardened to 740 ± 80 HV 10 and ground
• Overall length 16 mm in the medium series
• Form A to DIN 172, the bore is rounded on the collar side so the tool enters easily

Applications

It is used wherever holes of 7.8 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 basis is DIN 172, form A, with a guiding bore of 7.8 mm. 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 afterwards.