V-Mar 20C Collet Stop

We have designed what we feel is the best 20C collet stop available. Most of the collet stops on the market use a threaded rod for the work piece to bottom against. This is very slow to adjust and expensive if you need to make different size stops. Our collet stop uses simple 3/8" rod. Easy to get and very cheap.

Adjustment is simple and fast, just loosen the two pinch bolds, slide the rod to the desired position and torque down the two 5/16" socket head bolts. We suggest tightening the bolts alternating between the two bolts to 8-10 ft/lbs. (96-120 in/lbs or 10.8-13.5Nm) using a torque wrench.

We offer the collet stop by itself if you want to make your own stop rod(s), or in a kit with 12 different size stops included. The stop rods are sized for 1/8", 3/16", 1/4", 5/16", 3/8". They are all approx 0.010" under the nominal dimension. So if you are locating a 1/4" work piece, the stop rod is 0.240" so the collet does not clamp onto the stop rod, it will insure that the collet clamps the work piece. The 2 smaller rods are aluminum. The 3/8" rod is Stainless Steel. On the opposite end from the 3/8 (0.365") end the rod is machined to a drill point angle, so the larger stop discs will bottom out securely. (This can be seen in the section view image) The larger stops that fit onto the SS rod are 1/2", 3/4", 1", 1-1/4", 1-3/8", 1-1/2" and 1-3/4", and just like the rods, these are all slightly undersize, approx 0.010". (ie 0.490", 0.740", 0.990" etc)

NOTE: If the work piece is longer than the clamping section of the collet you can use any of the stops, the stepped down stop rods are only needed when the work piece is short and the stop rod needs to fit up into the clamping section of the collet. See the cutaway CAD diagram.

Made in the USA from 6061 aluminum, black anodized. The stop rods are aluminum and stainless steel, the larger stop discs are also black anodized aluminum.