Common 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.

Common hex key 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. Differ ence in 1 1000s of an inch. Newer campy cranks attach at the center to the bottom bracket with a 10mm bolt. Hex keys with t shaped handles can provide increased turning power and more comfortable grips.

Interchangable 0 028 and 0 7mm. Hex fasteners are common in all sorts mechanical equipment and devices including bicycles motorcycle engines and assemble it yourself furniture aka ikea. Also called hex keys allen keys are an essential for bike maintenance. Common metric hex key sizes.

However the 1 4 sae hex wrench will likely work in place of a 6 5 mm wrench. 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. Remember to be wary of the leverage when tightening a bolt.

Hex key standard sizes. Hexagonal ones are great for easy grip but the folding ones give you more sizes. Everything from adjusting your brakes to tightening your seat post will require an allen key. They re designed to provide 360 rotation at angles up to 35.

In the united states larger metric half sizes like 6 5 mm aren t standard in most hex key sets. A hex wrench or allen wrench features a hexagonal shape and can be used with automotive plumbing and electrical applications. 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. 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.

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. 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. Fixing bolts number and sizes vary. Lastly there s one other added benefit to having both sae metric hex keys.

Use ball end hex keys at an angle off axis to the screw. 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.