Aluminum Hand Knobs 21119

Air-Feed-Drill Bushings – Standard (21000 Series). The 21000-series bushings shown here have 3/4-16 mounting threads. This series is available in three OD sizes to fit drill diameters from.0938" to.3750". Preferred sizes can be mounted by any method, including the use of Lock Liners, while other sizes have limited mounting options. 3/8" OD (Preferred size). 7/16" OD. 1/2" OD (Preferred size). To order a specific standard bushing, select the basic part number below and add the desired ID drill size (as a 4-place decimal inch) on the Price & Availability screen. See Technical Information tab for Standard Drill Sizes. Standard prices apply only to bushings with a standard inch, number, letter, or metric ID size within the stated range. Example standard bushings: A-21101-.1250 Adaptor-Tip Assembly, 1/8" ID. 21101-.1250 Shank only, 1/8" ID. 21000 Collar only. Accessories: Lock Liner; PART NO. / SHANK OD / MATCHING ADAPTOR-TIP ASSEMBLY; A-16520 / 3/8 / A-16500; - / 7/16 / -; A-16521 / 1/2 / A-16501; Taper-Lok Lock Liner; PART NO. / SHANK OD / MATCHING ADAPTOR-TIP ASSEMBLY; TLL-16520 / 3/8 / A-21106; - / 7/16 / -; TLL-16521 / 1/2 / A-21306; Lock Nut; PART NO. / SHANK OD; 14441 / 3/8; - / 7/16; 14442 / 1/2; Liner; PART NO. / SHANK OD; 19936 / 3/8; 19937 / 7/16; 19938 / 1/2; Lockscrew; PART NO. / SHANK OD; 16531 / 3/8, 7/16, 1/2; Taper-Lok Air-Feed Lockscrew; PART NO. / SHANK OD; CL-11-AFL / 3/8, 7/16, 1/2; CL-13-AFL / 3/8, 7/16, 1/2; CL-14-AFL / 3/8, 7/16, 1/2; Lo. ID Tolerance: Standard ID Tolerance: From #70 to 1/4" +.0001/+.0004 Over 1/4 to 3/4" +.0001/+.0005 Over 3/4 to 1-1/2" +.0002/+.0006 Reamer ID Tolerance (Special): From #70 to 1/4" +.0005/+.0008 Over 1/4 to 3/4" +.0006/+.0010 Over 3/4 to 1-1/2" +.0008/+.0012 Reamer bushings have a different ID-tolerance range than drill bushings. To special-order bushings with the reamer ID tolerance shown here, add "-REAMER" to the part number: A-21101-.1250-REAMER (Special). Optional Contour Nose: Angular nose on shank is ideal for drilling on sloped or curved surfaces. Available on standard and coolant-type shanks. Add "-C" suffix to part number: A-21101-.1250-C Adaptor-Tip Assembly with contour nose, 1/8" ID 21101-.1250-C Shank only, with contour nose, 1/8" ID 21000 Collar only (standard, no suffix). Material: Other materials are available by special order; MATERIAL / HEAT TREAT / FINISH / DFARS / RoHS; 1144 Stressproof Steel / heat treated to achieve Rc 62-64 ID hardness / - / ✔ / ✔.