Drill Bushing General Spec's

Material

Standard drill bushings are manufactured from either C1144 Stressproof steel or other high carbon steels. The bushings are heat treated to achieve an ID Rockwell hardness of C62-64. Optional materials such as tungsten carbide, 52100 steel, A2 tool steel, D2 tool steel, M2 tool steel, 416 stainless, 440C stainless, 17-4PH stainless, 303 stainless, 660 bronze, Ampco 18 bronze, Oilite, and brass are available as specials.

Counterbores

Upon request, bushings can be ordered with or without counterbores. Long bushings with small ID's are slightly counterbored for proper drill-bearing length and chip clearance. Counterbores prevent binding and heat build up due to excessive bearing length. Counterbore diameters are generally 1/32 inch larger than the inside bearing diameter.

Concentricity

The bushing OD is ground concentric to the ID to within .0003 TIR (total indicator reading) for ID sizes from 1/8 inch to 1/2 inch (3mm to 12mm). For larger or smaller sizes, concentricity is within .0005 TIR. Unground bushings are concentric to within .006 TIR. On counterbore bushings, concentricity applies only to the drill-bearing length.

How to find your ANSI value

Click on the picture below to find out more about each style of Bushing. This will also help you convert your dimensions to ANSI value which can then use in the Seach By ANSI search box.