Common Hex Key Sizes

Substituting uncommon hex sizes.

Common hex key sizes.

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. Differ ence in 1 1000s of an inch. 5mm hex or t25 torx wrench. Hex keys are measured across flats af which is the distance between two opposite parallel flat sides of the key.

Hex fasteners are common in all sorts mechanical equipment and devices including bicycles motorcycle engines and assemble it yourself furniture aka ikea. Common sizes of allen wrenches although allen wrenches come in a wide range of sizes there are a few sizes in particular that tend to be more commonly used than others. Hexagonal ones are great for easy grip but the folding ones give you more sizes. Interchangable 0 028 and 0 7mm.

In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. Remember to be wary of the leverage when tightening a bolt. Use ball end hex keys at an angle off axis to the screw. Hex key equivalent sizes.

Lastly there s one other added benefit to having both sae metric hex keys. Common metric hex key sizes. Fixing bolts number and sizes vary. If you only own a set of short allen keys consider getting at least the 8 and 10mm sizes in a longer length.

However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. Newer campy cranks attach at the center to the bottom bracket with a 10mm bolt. A hex wrench or allen wrench features a hexagonal shape and can be used with automotive plumbing and electrical applications. Everything from adjusting your brakes to tightening your seat post will require an allen key.

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 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. Hex keys with t shaped handles can provide increased turning power and more comfortable grips. Hex key standard sizes.

Also called hex keys allen keys are an essential for bike maintenance. Hex key kit with stand klein tools.