Different Chuck Key Sizes

Shop the top 25 most popular chuck key sizes at the best prices.

Different chuck key sizes.

Step 2 measure the diameter of the hole on the side of the chuck in inches with a ruler. Keyed chucks are engineered to either loosen or tighten the hold on a tool by using a key. 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. This is the most common size and takes a hammer up to 4 kg.

Determining the proper replacement chuck key for your drill can be very frustrating. Generally a chuck does not have a wide range of sizes but only two. This measurement is called the pilot shank. A 10 mm shank with two open grooves held by the driving wedges and two closed grooves held by locking balls.

The chuck size looks something like. 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. 10 mm 3 8 inches and 13 mm 1 2 inch. When it comes to drill chuck key holders grainger s got your back.

1 4 3 8 1 2 etc. If you plan to use large bits then choose a larger chuck. Unless a real oddball most chuck keys will be listed by pilot size. The larger the size the bigger the shank.

But what if you need to drill a hole whose diameter will be larger say 20 mm. Since everyone has different needs let s run down the different grades of chucks. 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. The wedges grip an area of 75 mm 2 0 116 sq in and the shank is inserted 40 mm into the chuck.

If you pull out your ruler you ll see that 1 8 isn t very big at all. Easy online ordering for the ones who get it done along with 24 7 customer service free technical support more. Keyless chucks are engineered to quickly loosen and tighten a tool on the chuck collar of the drill either by manual. Keyed chucks offer the advantage of applying additional torque on the bit when slippage is a concern during heavy duty applications.