Standard Allen Key Sizes Metric

It became the standard name for what had previously been called a hex key.

Standard allen key sizes metric. 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. 7 to 22 in 1 mm increments. 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.

However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. Engineering metric hardware design data. 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. Lastly there s one other added benefit to having both sae metric hex keys.

Interchangable 0 028 and 0 7mm. Diam ete r wrench size diam ete r hex key size 6605 n. 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. 2 to 6 in 0 5 mm increments.

The allen manufacturing company created a set of quality hexagonal wrenches and produced them at a rapid pace. In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. The allen wrench dates back to the mid 1900s. All dimensions are in millimeters.

These standard allen keys offer a larger range of sizes than the stainless types. Hex key equivalent sizes. Standard external metric thread and fastener sizes m 0 25 m 1 4. 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.

Differ ence in 1 1000s of an inch. Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36. Engineering hardware design data iso hardware specifications table. 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.

Gessner houston tx 77040 4015 ph. Substituting uncommon hex sizes. Common metric hex key sizes. 0 7 0 9 1 0 1 25 1 3 1 5.

24 25 27 30 32 36 42 and 46 mm. Refer the following table for metric allen key sizes and dimensions for corresponding socket head cap screw based on iso 4762 din 912 standards.