Drill bush DIN 179 form B, medium type, bore 4 mm, length 12 mm, outside dia 7 mm

For repeatable holes of 4 mm diameter this bush is seated in the drill plate by its ground outside diameter of 7 mm. The drill stays guided across 12 mm of length, and the bore is rounded on both sides.

Benefits

• Bore rounded on both sides to form B, so the bush can be fitted either way round
• Guide bore of 4 mm to DIN 179 for the matching tool
• Special case-hardening steel, hardened to 740 ± 80 HV 10 and ground
• Outside diameter of 7 mm as a ground seat in the drill plate
• Guide length of about 3 drill diameters at 12 mm of length

Applications

• Hole patterns in assembly jigs and equipment frames
• Workshop production with changing workpieces
• Redrilling and opening up holes on existing jigs
• Pattern making and mould making

Standard and material

The basis is DIN 179 for cylindrical drill bushes. Form B means a bore that is rounded on both sides. Made of special case-hardening steel, hardened to 740 ± 80 HV 10 and ground.