Standard Allen Key Sizes Metric

24 25 27 30 32 36 42 and 46 mm.

Standard allen key sizes metric.

It became the standard name for what had previously been called a hex key. The allen manufacturing company created a set of quality hexagonal wrenches and produced them at a rapid pace. Engineering metric hardware design data. Metric key keyway dimensions.

Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36. For example for an m8 socket head cap screw we need at least 32 8 head size 40mm clearance above the screw for easy accessibility. Standard metric sizes are defined in iso 2936 2014 assembly tools for screws and nuts hexagon socket screw keys also known as din 911 and measured in millimeters mm are. Engineering hardware design data iso hardware specifications table.

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. These standard allen keys offer a larger range of sizes than the stainless types. Common metric hex key sizes. 0 7 0 9 1 0 1 25 1 3 1 5.

Diam ete r wrench size diam ete r hex key size 6605 n. Interchangable 0 028 and 0 7mm. Refer the following table for metric allen key sizes and dimensions for corresponding socket head cap screw based on iso 4762 din 912 standards. Metric key keyway dimensions per iso r773 js9 width tolerance.

All dimensions are in millimeters. 7 to 22 in 1 mm increments. Substituting uncommon hex sizes. In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets.

However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. Differ ence in 1 1000s of an inch. Gessner houston tx 77040 4015 ph. 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.

The allen wrench dates back to the mid 1900s. Metric external table chart thread designations sizes m 1 6 m 18. Lastly there s one other added benefit to having both sae metric hex keys. The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.

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 corners in allen head screws.