BSW HEX ALLEN KEY WRENCH LONG-SHORT ARM BALL-FLAT END Holder CR-V STEEL

BSW (British Standard Whitworth) hex sizes follow an inch-based system historically used in British engineering. The across-flats dimensions do not match metric hex sizes or SAE UNC/UNF hex sizes of nominally similar measurements. Using a metric or SAE key in a BSW socket — or vice versa — risks rounding the fastener corners. Always confirm your fastener standard before selecting a wrench.

Choose the Ball Head when the fastener is recessed at an angle or when surrounding components block a straight-on approach. The ball tip allows entry at up to approximately 25–30° off-axis, which is useful in engine bays, panel interiors, and machinery frames. Use the Flat Head when you need maximum torque transfer — the flat tip seats fully in the socket and handles higher loads without the slight contact-area reduction of a ball end.

CR-V stands for Chrome Vanadium steel, an alloy that combines chromium (for hardness and corrosion resistance) with vanadium (for toughness and fatigue resistance). For hex keys, this means the tool can absorb repeated torque cycles without developing micro-cracks or losing its hex geometry — a common failure mode in lower-grade carbon steel keys. The result is a longer service life and more consistent fit across the fastener's lifetime.

Measure the across-flats width of the hex socket opening with a caliper, then match it to the BSW hex size listed in the variant options. If you are unsure of the standard, check the original equipment documentation or compare against a known BSW reference gauge. A correctly sized key should seat fully with no play; any wobble indicates a size mismatch.

Use the long arm when you need extra torque leverage — for example, when breaking loose a tight set screw or driving a fastener to a specific torque. Use the short arm when space around the fastener is limited and the long arm would contact surrounding components. The short arm also gives better knuckle clearance in recessed pockets. Both arms are on the same key, so you can switch without changing tools.

Yes. BSW hex fasteners were widely used in British motorcycle and automotive manufacturing through the mid-20th century. This set covers the size range most commonly encountered in that equipment — from small 1/16" set screws on carburetors and controls up to larger 1/2" and 9/16" grub screws on drive components. Confirm the specific sizes your vehicle requires before ordering.

If you need a single replacement key for a specific size, order a pack of 1. For workshop stock where a size sees frequent use, packs of 5 or 10 reduce the risk of running out mid-job. Packs of 2 are a practical middle ground for occasional-use sizes. Select the head style and thread size first, then choose the pack quantity that matches your usage pattern.