Collets and Sleeves ER Single-Angle Collets Catalog Numbering System How Do Catalog Numbers Work? Each character in our catalog number signifies a specific trait of that product. Use the following key columns and corresponding images to easily identify which attributes apply. 40ERC160M 40 ER C 160 M System Size Collet Style Special Feature Collet Bore Size Identification (optional) Value 11 = ER11 ER-DIN 6499 = TC = metric (xx.x) M= Single-angle16=ER16 Solid tapping(square for drive) 010 = 1mm Collet bore size builtto metric values 20 = ER20 TCT = 160 = 16mm (blank) = 25 = ER25 Solid tappingwith tension only 245 = 24,5mm Collet bore size builtto metric values 32 = ER32 inch (x.xxx) 40 = ER40 0125 = 1/8" 0500 = 1/2" 1000 = 1" WWW.WIDIA.COM I51