Generally, these types of wrenches are not recommended for use in high torque applications as the engagement with the fastener when using the ball end is reduced. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. This article provided a summary of the commonly available sizes of Allen™ wrenches/keys and explained the different types of Allen™ wrenches as well as the advantages of these tools. A hex key, also known as an Allen Key, Allen wrench or hex wrench is a small L shaped or T shaped tool with a 6-sided hexagonal tip which is used to loosen hex socket screws or bolts. Clearance – Allen™ screws feature a hollow hexagonal socket into which the Allen™ wrench is inserted rather than using an exposed head such as those found on a hex head bolt.

Draper 16mm Metric Hexagon Key - The Range Draper 16mm Metric Hexagon Key - The Range

This feature helps prevent the wrench from accidentally falling into a work area and causing injuries or equipment damage. For information on other topics, consult our additional guides or visit the Thomas Supplier Discovery Platform where you can locate potential sources of supply for over 70,000 different product and service categories, including suppliers of Allen™ wrenches and other hex key wrenches. This can be an advantage for applications where mobility is important such as with cyclists that might want to carry a bike tool kit along on a ride.Not all size values shown in the tables below will be available in all tool lengths, materials, or handle options. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.

Allen Wrench/Key Size Chart - Thomasnet Allen Wrench/Key Size Chart - Thomasnet

Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The Beryllium Copper material will not create sparks if the tool accidentally slips and strikes another metal surface.

Socket screws have a hexagonal drive and are deisgned to be used with an allen key, which can be beneficial if the work is being done in a confined space. Non-sparking designs – While most Allen™ keys use an alloy steel or tool steel material in their fabrication, there are options available that utilize Beryllium Copper in lieu of steel. Besides the common types described earlier, Allen™ wrenches are available with other features that improve safety or increase convenience for using the tool. Refer the following table for metric allen key sizes and dimensions for corresponding socket head cap screw based on ISO 4762/DIN 912 standards. Insulated key designs – Some styles of Allen™ key may have the handle and wrench shaft coated with a non-conductive coating to provide protection for users that may be utilizing the tool in operating conditions that could expose them to electrical currents from conductive wires or components.