Allen Key Sizes

Less common metric sizes.

Allen key sizes.

However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. There are a few ways that you can tell what hex key you may need to finish a project tighten a set of screws or loosen an old screw. In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. Lastly there s one other added benefit to having both sae metric hex keys.

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. 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. Hex key equivalent sizes.

You can find a chart of the allen wrench sizes from any manufacturer. 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. Interchangable 0 028 and 0 7mm. These standard allen keys offer a larger range of sizes than the stainless types.

Allen wrenches are convenient and helpful. These sizes are 1 mm 1 25 mm 3 5 mm 4 5 mm 5 5 mm 7 mm. Substituting uncommon hex sizes. If you aren t sure what size you need an allen wrench size chart can be a handy tool to get you on your way.

These dimensions of allen keys can be used to check the accessibility of your bolts were space is limited. The tool is usually formed of a single piece of hexagonal rod of hard steel with blunt ends that are meant to fit snugly into the screw s socket bent in an l shape with unequal arms the tool is usually held and twisted by the long arm creating a large torque at the tip of the. Hex key size 3 16 1 4 5 16 3 8 3 8 7 16 diameter m16 mio m12 m14 m16 m18 m20 m22 m24 m30 wrench size 7 mm 8mm 10mm 13mm 17mm 19mm 22mm 24mm 27mm 30mm 32mm 36mm 46mm hex key size 3 mm 4mm 5mm 6mm 8mm 10mm 12mm 14mm 14mm 17mm 17mm 19mm 22mm 1 1 1 2 5 8 3 4 3 4 7 8 7 8 1 4 1 2 1 2 2 2 7 8 16 1 4 5 8. Nominal screw sizes m5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.

The good news is that just about every tool manufacturer has a range of allen wrench sets you can buy. 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. A hex key or allen key is a simple tool used to drive bolts and screws with hexagonal sockets in their heads. While these metric allen key sizes do exist they rarely appear in your basic allen wrench sets.

In that case you ll want a range of allen wrenches to make sure you have the right size for every particular need.