0.7mm-17mm Allen Keys Hexagon Key Hex Wrench Extra Long 5mm 6mm 8mm 10mm 14mm

Sizes range from 0.7 mm through 17 mm, covering the full metric hex socket range. To choose the correct size, check the fastener head marking or measure the socket opening across flats with a caliper. Common sizes for furniture and bicycles are 4–6 mm; precision electronics typically use 0.7–2 mm; heavy machinery often requires 8–17 mm. If unsure, the M0.7–M10 set covers the most frequently encountered sizes in a single purchase.

The standard straight-end key must be inserted perfectly in line with the fastener axis. The ball-end tip has a rounded profile that allows engagement at angles of approximately 25–30° off-axis, which is useful when working in confined spaces where you cannot align the key straight on. Note that ball-end keys should not be used for final high-torque tightening — use the straight end for that step to avoid damaging the socket.

A2 stainless steel is the best choice for outdoor, marine, or food-adjacent environments where corrosion resistance matters. Carbon steel (plain or nickel plated) is a cost-effective option for general workshop use in dry conditions — the nickel plating adds a layer of surface protection. Alloy tool steel offers the highest hardness and torque capacity, making it the right choice for heavy-duty applications or when working with high-strength fasteners that require maximum force without key deformation.

Extra long hex keys have a shaft that is significantly longer than standard keys — typically 100–200 mm longer depending on size. This extended length serves two purposes: it allows the key to reach fasteners recessed deep inside machine frames, furniture panels, or equipment housings; and it provides a longer lever arm, which means you can apply more torque with less hand effort. This is especially valuable for loosening seized or over-tightened fasteners.

No — these are metric hex keys only. Metric and imperial hex sizes are not interchangeable; using a metric key in an imperial socket (or vice versa) risks rounding the fastener head. If you need imperial sizes (e.g., 3/32", 1/8", 3/16"), please contact us to confirm availability. Always verify whether your fasteners are metric or imperial before selecting a key.

These are manual hand tools and are not designed for use with power drills or impact drivers. The shank is not configured for chuck or bit-holder attachment. For power-tool hex driving, you would need a hex bit set with a 1/4" or 3/8" drive shank. Using these keys with rotary power tools risks tool breakage and personal injury.

Always insert the key fully so the entire hex profile is engaged — partial engagement concentrates stress on the corners and causes rounding. Use the straight end (not the ball end) for high-torque operations. Avoid applying excessive force beyond the key's rated capacity; if a fastener is seized, apply penetrating fluid and allow it to soak before attempting removal. Keep the key clean and free of debris that could prevent full seating.