Standard Allen Key Sizes Metric

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.

Standard allen key sizes metric.

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. Metric external table chart thread designations sizes m 1 6 m 18. 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. 0 7 0 9 1 0 1 25 1 3 1 5.

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. However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. Metric key keyway dimensions per iso r773 js9 width tolerance. 2 to 6 in 0 5 mm increments.

In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. The m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart. 7 to 22 in 1 mm increments. Lastly there s one other added benefit to having both sae metric hex keys.

24 25 27 30 32 36 42 and 46 mm. Differ ence in 1 1000s of an inch. Hex key equivalent sizes. Metric key keyway dimensions.

Standard external metric thread and fastener sizes m 0 25 m 1 4. Gessner houston tx 77040 4015 ph. All dimensions are in millimeters. It became the standard name for what had previously been called a hex key.

Substituting uncommon hex sizes. The allen wrench dates back to the mid 1900s. These standard allen keys offer a larger range of sizes than the stainless types. Interchangable 0 028 and 0 7mm.

Common metric hex key sizes. Diam ete r wrench size diam ete r hex key size 6605 n. Refer the following table for metric allen key sizes and dimensions for corresponding socket head cap screw based on iso 4762 din 912 standards. Engineering hardware design data iso hardware specifications table.

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. 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.