Collis 70093 #300RS to #40 Taper ER Collet Chuck Toolholder

The Collis 70093 is a new #300 Registered Shank (RS) to NMTB #40 taper ER collet chuck toolholder, manufactured by Collis Toolholder Corporation — a well-established American maker of precision toolholding systems. The #300 RS shank is a registered shank format used primarily on Bridgeport-style vertical milling machines and compatible knee mills, while the NMTB #40 taper body seats into standard #40 spindle machines, making this a shank adapter/collet chuck combination unit. The ER collet interface (visible in the label notation '#40 ER**') allows the use of standard ER-series collets for work holding; the specific ER size (ER32 or ER40) should be confirmed against Collis published catalog data for part number 70093, as the last two characters are partially obscured on the label. The body features a knurled locking nut, a drive slot on the flange for positive spindle engagement, and a threaded drawbar hole at the top of the shank. The black oxide finish provides corrosion resistance; the unit is unused and retains its original plastic protective packaging.

Product Specifications