Common Hex Key Sizes

Differ ence in 1 1000s of an inch.

Common hex key sizes.

Use ball end hex keys at an angle off axis to the screw. 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. Substituting uncommon hex sizes. Newer campy cranks attach at the center to the bottom bracket with a 10mm bolt.

Remember to be wary of the leverage when tightening a bolt. Hexagonal ones are great for easy grip but the folding ones give you more sizes. 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. Hex keys are measured across flats af which is the distance between two opposite parallel flat sides of the key.

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. A hex wrench or allen wrench features a hexagonal shape and can be used with automotive plumbing and electrical applications. However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. Lastly there s one other added benefit to having both sae metric hex keys.

In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. Hex key kit with stand klein tools. In standard measurements the most common allen wrench sizes for the tasks listed above that is automotive repair bike work and furniture assembly are the 5 32 inch 3 16. Hex keys with t shaped handles can provide increased turning power and more comfortable grips.

5mm hex or t25 torx wrench. Hex key equivalent sizes. Hex fasteners are common in all sorts mechanical equipment and devices including bicycles motorcycle engines and assemble it yourself furniture aka ikea. Interchangable 0 028 and 0 7mm.

Hex key standard sizes. Common metric hex key sizes. If you only own a set of short allen keys consider getting at least the 8 and 10mm sizes in a longer length. They re designed to provide 360 rotation at angles up to 35.

Everything from adjusting your brakes to tightening your seat post will require an allen key. Fixing bolts number and sizes vary.