The good news is that just about every tool manufacturer has a range of allen wrench sets you can buy.
Metric allen key sizes chart.
Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than m3 nor larger than m36.
However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench.
Hex key size.
Most allen wrenches have the size stamped clearly on the side of the tiny angled tool.
Differ ence in 1 1000s of an inch.
Of these sizes some of the more popular ones are 2 5 mm 3 mm 4 mm 5 mm 6 mm 8 mm 10 mm.
In this case an allen wrench or hex key chart can make finding the right size for your socket head much easier.
You can find a chart of the allen wrench sizes from any manufacturer.
Common metric hex key sizes.
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Damage to the fastener or the tool can result from using a hex wrench that is too small for the socket for example a 5 mm tool used in a 5 5 mm socket.
In that case you ll want a range of allen wrenches to make sure you have the right size for every particular need.
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 m3 and m4 nominal screw sizes have two drilled holes spaced 180 degrees apart.
In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets.
Substituting uncommon hex sizes.
Hex key equivalent sizes.
Engineering metric hardware design data.
The inch or millimeter size may have rubbed off with use or may be entirely too small to read.
Tools for hex head bolts and socket heads metric tools for hex head bolts and socket heads diameter 1 4 5 16 3 8 7 16 1 2 9 16 5 8 3 4 7 8 1 1 8 1 1 4 1 3 8 1 1 2 1 3 4 wrench size 7 16 1 2 9 16 5 8 3 4 13 16 15 16 1 1 8 1 5 16 1 1 2 1 11 16 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.
Interchangable 0 028 and 0 7mm.
Lastly there s one other added benefit to having both sae metric hex keys.
Hex keys are measured across flats af which is the distance between two opposite parallel flat sides of the key.
