Imperial Allen Key Sizes In Mm

Most allen wrenches have the size stamped clearly on the side of the tiny angled tool.

Imperial allen key sizes in mm. Stan dard sae hex key sizes inches metric hex key sizes mm notes compares standard and metric allen wrench sizes where they closely match and where they don t wrench equivalence 15 key set. You won t find those exact keys in a metric set. Imperial to metric for allen keys. In this case an allen wrench or hex key chart can make finding the right size for your socket head much easier.

The tables below are basically identical but available in different measurements. The third table is related to more specific allen keys and it shows the correlation between the hex size in inches and the long short arm ibn millimeters. 1 8 inch would be 3 175mm so you might be able to get away with the 3mm key but it would be a little loose in a 1 8 inch socket. If you re looking for a quick imperial to metric conversion guide for allen wrenches you ve come to the right place.

For instance metric size 9 mm doesn t have an imperial counterpart. Differ ence in 1 1000s of an inch. But before you choose to reference this chart you must know that we always recommend that you upgrade to a separate metric hex key set. Allen keys imperial these standard allen keys offer a larger range of sizes than the stainless types.

On the left hand side we have our sae to metric conversion guide for hex keys that provides the best substitute sae allen wrench for each given metric size. 1 5 mm is a close substitute for hex size 1 16 but use caution with sizes this small substituting metric allen wrenches for sae sizes with so many items manufactured in the united states sae hex screws are still prominent throughout the world. Interchangable 0 028 and 0 7mm. In addition to the precision sizes mentioned above the common metric allen wrench sizes are 1 5 mm 2 mm 2 5 mm 3 mm 4 mm 4 5 mm 5 mm 5 5 mm 6 mm 7 mm 8 mm 9 mm 10 mm.

Hex plus offers a bigger contact surface in the screw head and so reduces the chance of wear and rounding off the. The inch or millimeter size may have rubbed off with use or may be entirely too small to read. These allen keys or wrenches from wera feature a hex plus head on the short arm and a six sided ball head on the long arm. Of these sizes some of the more popular ones are 2 5 mm 3 mm 4 mm 5 mm 6 mm 8 mm 10 mm.

As you ll notice there isn t always a perfect substitute. Common metric hex key sizes. The first one is millimeters or metric while the second is in inches imperial size chart. If the bolts seem to be in between sizes this size is too loose and the next size up is too big switch to the other.

We ve provided the best substitute sae hex key for each given metric size.