Drill Bushings

1. Boneham Micro Sized Drill Bushings (.0130" -.0400" bores) are manufactured from tool steel and are "through hardened" to Rc 62 - 64.
   
   
2. Standard Boneham Drill Bushings (over .0400" bore) are manufactured from steel which demonstrates excellent wear resistance and dimensional stability characteristics. This material is "hardened" to Rc 62 - 64.
   
   
3. All Boneham Drill Bushings (.0625" bore and over) are offered in our Premium 'NITRALLOY'. BMP NITRALLOY Drill Bushings are "NITRIDED" to a depth of .013" to Rc 67 - 69 equivalent. NITRALLOY Nitrided drill bushings demonstrate superior wear resistance and dimensional stability characteristics.
   
   
4. Our Sales Service Representatives will be glad to provide you with a quotation on those bushings which have material requirements that are different from our standard materials, ie. SAE 52100, M-2 HSS, Stainless Steel, 0-6 Tool Steel, Carbide, Bronze (both sintered and wrought), and D-2 Tool Steel.

All of the bushings listed within the BMP catalogs conform to the American National Standards institute (ANSI). The range of standard bushing bores are those standard to letter, number and fractional sizes, in both drill and reamer tolerances, as defined by ANSI. The entrance end of each Boneham drill bushing had a ‘blended radius’, the permits easier tool entry and assistance in guiding the drill in cases of minor drill/ drill bushing misalignment. Any drill bushing with either a ‘small’ bore, or with a ‘large’ drill bushing length-to-bore ratio is counterbored. This is to provide assistance with lubrication supply to the drill point, as well as expedient removal of chips.