Standard Allen Key Sizes Metric

These standard allen keys offer a larger range of sizes than the stainless types.

Standard allen key sizes metric.

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. Refer the following table for metric allen key sizes and dimensions for corresponding socket head cap screw based on iso 4762 din 912 standards. Hex key equivalent sizes. 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.

Metric external table chart thread designations sizes m 1 6 m 18. 7 to 22 in 1 mm increments. 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.

2 to 6 in 0 5 mm increments. Diam ete r wrench size diam ete r hex key size 6605 n. In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. 0 7 0 9 1 0 1 25 1 3 1 5.

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

Differ ence in 1 1000s of an inch. 24 25 27 30 32 36 42 and 46 mm. The allen wrench dates back to the mid 1900s. However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench.

Lastly there s one other added benefit to having both sae metric hex keys. Metric key keyway dimensions. 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. Gessner houston tx 77040 4015 ph.

Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36. The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart. 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. All dimensions are in millimeters.

Metric key keyway dimensions per iso r773 js9 width tolerance. Standard external metric thread and fastener sizes m 0 25 m 1 4.