Eazypower 30199 1/4" Hex Shank Chuck Adapter with 3/8"-24 UNF Thread, (1per Pack)

If you have a 1/4" Impact drill and another drill, then you need to have two sets of drill bits up to 1/4". If you buy this adapter which is adapted for the Impact drill then all you need to do is buy the separate chuck which can be either 3/8" or 1/2" and you are all set to use all drill bits in both drills.

Unfortunately, I cannot recommend this product to anyone who is not willing to undertake some serious re-machining to make this product work, and that makes it unacceptable even though, after the modifications I had to make, it worked pretty much as described. Here's the problem and the solutions, for those of you who feel you are capable of undertaking the effort and wish to save some money.The purpose of the adapter is to allow use of a standard 3/8" chuck on a power tool which comes with a 1/4" hex shank output, pretty standard on a growing number of hand power tools including both drills as well as impact wrenches. Having the ability to quickly change to a 3/8" chuck allows the use of any sized drill bit or tool, not just ones with a 1/4" hex shank.The adapter is machined from mild steel and has a 1/4" hex shank at one end, with a groove so that it will lock into place when inserted into a 1/4" hex chuck. The other end of the adapter is machined with a 3/8"-28 threads per inch American style thread on the outside, while the inside is drilled and tapped for a supplied left-handed turn locking thread screw. (In the photo of the product on the Amazon product page, the hex shank is at the top and the 3/8" thread and the left handed locking screw are shown at the bottom.)But in practice, the actual tool, as supplied, had to be modified considerably before it could be put to its intended use. Here's the list and the corrections:1) The locking groove (shown near the end of the upper part of the shank) is located too far from the end of the shank, as a result of which, the adapter will not lock into the 1/4" hex driver on most all tools. Correction: while rotating the adapter, grind off about 1/4" from the end of the shaft near the groove; then grind a 45 degree chamfer on that end so that the adapter does not hang up.2) The head on the locking screw was too large to fit inside the open jaws of my Jacobs 3/8" chuck. Correction: chuck the screw into my other cordless drill and turn it against the grinding wheel to take about 3/32" of the O.D. of the screw head, then once again, grind a small chamfer on the screw head.3) The shaft on the locking screw was too large to fit through the hole of my Jacobs 3/8" chuck, although the screw which came with the drill itself went through just fine. (In other words, the left-handed locking screw provided with the adapter is a larger diameter than it should be). Correction: drill or ream out the hole in the Jacobs chuck to 1/4".4) The tapped left-handed thread for the lock screw (bottom of the photo) is of such shallow and insufficient depth that it appears likely that with much use, the thread will completely strip out and leave no way to lock the chuck onto the adapter when reversing the drill or tool. There is no way to correct this; the hole was simply drilled too large and cannot be corrected.5) The use of mild steel, instead of high carbon or chrome tool steel, combined with very poor machine work, mean this adapter will not last as long as one which was properly made. There is no correction.That said, once the adapter was modified in this manner, it worked perfectly. However, for those of you who wish to have a 3/8" chuck available for use on tools with a 1/4" shank, I strongly recommend purchasing one of the complete sets supplied by DeWalt or one of the other "brand name" manufacturers to avoid the work and possible grief of this tool.

After 3 modifications it performs perfectly. First mod, the supplied screw does not fit a jacobs 3/8 " chuck. The screwhead had to be ground down to a smaller diameter to go into the chuck. Second mod, the supplied screw is to large for the hole in rhe chuck. Had to widen the hole with a drill. Third mod, the shaft is too long so that it bottoms out in my ryobi impact driver whitout getting held in place so it would just fall out. My grinder cured this ailment though. Not as universal as I expected.

The set screw that comes with this adapter is the wrong size for a 3/8 drill chuck. the head of the screw is larger than the hole in the chuck and the length of the screw is to long to allow the adapter to seat in the drill. Unusable as shipped and not worth the amount of machining to make it work.

Once I got this Hex Shank Chuck Adapter it was off to an area machine shop for re-tooling. I had the shank end milled down all the way to the collar to fit any 1/4-inch collet mount power tool. Also shortened the shank to 1-inch. The left-hand threaded retainer screw also needed its head chamfered to clear 3/8-inch chucks.

I recently bought a new drill/driver with a "quick change" type hex chuck. I bought this shank to convert a standard type chuck to an adaptor so I could use all my old style [non-hex shank] drill bits with the new drill. It does not work. The short segment at the tip of the shank, which is supposed to lock into the quick change chuck, is too long. So, it does not lock in place in the "quick change" chuck. I might as well use the original round shaft of the standard chuck.

Haven't used it yet, due to me making my own!But for a product being made already, you can't beat it!Especially for the dollar

Shipment arrived with a 1/4 hex by 1/2" 20 thread adapter in the package.Contacted manufacturer detailing problem.Eazypower found more such items in their warehouse however they insisted that I return the item before shipping a new one. Precious time lost for the return of a nickel and dime item which they recognize as their error.Beware of this problem.