Which Craftsman Drill Press Chuck Key Fits? Start With the Model and Taper

Losing a drill press chuck key is a rite of passage. It rolls off the table, disappears into the shop, and suddenly your Craftsman press is a paperweight until you find a replacement. The trouble is that chuck keys are not one-size-fits-all, and buying the wrong one is a common, avoidable mistake. The fix is simple once you know what actually determines fit: the chuck itself, not the drill press model name. Here is how to get the right key the first time.

What determines chuck key fit

A chuck key fits the chuck, not the machine. What matters is the size of the chuck’s key hole and the diameter of the toothed gear ring around it. Chuck keys come in standard sizes matched to chuck capacity, so a key for a 1/2-inch chuck differs from one for a 5/8-inch chuck. Two things decide your key:

• Chuck capacity. Most Craftsman benchtop presses use a 1/2-inch chuck; larger 12- and 15-inch machines often use a 5/8-inch chuck. This roughly sets the key size.
• The pilot and gear. The key’s pilot tip must match the chuck’s key hole diameter, and its teeth must mesh with the chuck’s gear ring. This is why measuring the chuck beats guessing from the model.

So the honest answer to “which key fits my Craftsman?” is: measure the chuck, or read the size stamped on it, rather than relying on the drill press model alone.

Matching by model as a starting point

The model number is still a useful starting point, because it points you to the original chuck spec. Craftsman stationary presses carry Sears model numbers (a 113 or later prefix), and Sears PartsDirect lists the original chuck and key for each. Look up your model, note the chuck capacity, and that tells you the standard key size to buy. But always cross-check against the actual chuck on your machine, since a previous owner may have swapped it.

Common Craftsman chuck key sizes

As a practical guide, the 8-inch and 10-inch Craftsman presses typically take a chuck key sized for a 1/2-inch keyed chuck, while the 12-inch and 15-inch machines often take a key for a 5/8-inch chuck. The key hole diameter and gear pitch fall into standard sizes, which is why a correctly sized universal drill press chuck key usually fits. Measure the diameter of your chuck’s key hole and match it, and you will get a key that seats and turns smoothly rather than slipping or refusing to engage.

Buying the right key and a backup

The smart move is to buy the right size and keep a spare, because you will lose one again. A correctly sized drill press chuck key or a universal drill press chuck key set covers the common sizes, and a magnetic chuck key holder mounted on the machine keeps it from wandering off. If your chuck itself is worn, a fresh keyed drill chuck with the matching arbor comes with a correct key. Measure the chuck’s key hole before ordering to confirm the size.

The verdict

The chuck key that fits your Craftsman drill press is determined by the chuck, not the machine’s name, so start by reading the chuck’s capacity and measuring its key hole. Use the Sears model number to find the original spec as a guide, then confirm against the actual chuck, since it may have been swapped. Most Craftsman benchtop presses take a 1/2-inch-chuck key and the larger machines a 5/8-inch-chuck key, both of which fall into standard sizes a universal key covers. Buy the correct size, add a magnetic holder, and keep a spare, and you will never again turn your drill press into a paperweight over a missing key.

Takeaways:

• A chuck key fits the chuck, not the drill press model. Match it to the chuck’s key hole and gear ring.
• Most Craftsman benchtop presses use a 1/2-inch chuck; larger machines often use a 5/8-inch chuck.
• Use the Sears model number to find the original spec, then confirm against the actual chuck.
• Buy the correct size, add a magnetic key holder, and keep a spare.

FAQ

What size chuck key does a Craftsman drill press use? It depends on the chuck. Most Craftsman benchtop presses take a key sized for a 1/2-inch chuck, while larger 12- and 15-inch machines often take a 5/8-inch-chuck key.

How do I know which chuck key fits? Measure the diameter of your chuck’s key hole and match the key’s pilot tip to it, and make sure the teeth mesh with the chuck’s gear ring. The chuck, not the model, decides fit.

Will a universal chuck key fit my Craftsman? Often yes, if it is the correct size for your chuck. Measure the key hole first, since universal keys still come in size ranges.

How do I find the original key for my model? Look up your Sears model number (a 113 or later prefix) on Sears PartsDirect for the original chuck and key spec, then confirm against the chuck on your machine.

Why does my chuck key slip or not engage? Usually the wrong size: the pilot tip does not match the key hole, or the teeth do not mesh with the gear ring. Match the key to the chuck’s dimensions.

Can I replace just the chuck if the key is lost? You only need a new key if the chuck is fine. A new chuck comes with a matching key, which is worth it only if the chuck is also worn.

How do I stop losing the chuck key? Fit a magnetic chuck key holder to the machine and keep a spare. The key belongs on the press, not loose on the bench.

References

• Sears PartsDirect, Craftsman drill press chuck and key lookup by model: https://www.searspartsdirect.com/
• Jacobs chuck and chuck key sizing reference: https://www.apextoolgroup.com/brands/jacobs/
• Craftsman drill press owner’s manuals (chuck specifications by model): https://www.searspartsdirect.com/model-lookup