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(More customer reviews)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.
Click Here to see more reviews about: Eazypower 30199 1/4-Inch Hex Shank Chuck Adapter with 3/8-Inch-24 UNF Thread
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