Different Chuck Key Sizes

Generally a chuck does not have a wide range of sizes but only two.

Different chuck key sizes. The larger the size the bigger the shank. Since everyone has different needs let s run down the different grades of chucks. Usually on the side of the drill chuck there will be some stamped numbers. Keyed chucks are engineered to either loosen or tighten the hold on a tool by using a key.

I tend to replace the bent coathanger type of key with a cross drilled type although i have broken teeth from the cheeper home store variety. The wedges grip an area of 75 mm 2 0 116 sq in and the shank is inserted 40 mm into the chuck. 1 4 3 8 1 2 etc. This measurement is called the pilot shank.

There are 2 major chuck sizes that most handheld drills have 3 8 or 1 2 if we crunch the numbers we can see that a 1 2 chuck is only 1 8 larger than a 3 8 chuck. Step 2 measure the diameter of the hole on the side of the chuck in inches with a ruler. One of the more popular brands is jacobs and most manufacturers will list an equivalent number which can make determining a replacement key a bit easier. Keyless chucks are engineered to quickly loosen and tighten a tool on the chuck collar of the drill either by manual.

But what if you need to drill a hole whose diameter will be larger say 20 mm. Unless a real oddball most chuck keys will be listed by pilot size. A 10 mm shank with two open grooves held by the driving wedges and two closed grooves held by locking balls. Determining the proper replacement chuck key for your drill can be very frustrating.

If you pull out your ruler you ll see that 1 8 isn t very big at all. 10 mm 3 8 inches and 13 mm 1 2 inch. The chuck size looks something like. Easy online ordering for the ones who get it done along with 24 7 customer service free technical support more.

Shop the top 25 most popular chuck key sizes at the best prices. When it comes to drill chuck key holders grainger s got your back. If you plan to use large bits then choose a larger chuck. I find an old round shoe lace tied to a key for the hand drill by the cord plug not only reminds you to unplug before changing bits.