

This makes an Allen wrench particularly effective with large fixings that require a lot of force to secure. Allen head fixings also allow for the application of greater torque than is possible with either slotted or Phillips screw heads. This type of wrench is primarily used for machine screws and bolts (rather than in wood) that fit into a threaded (blind) hole or often through a plate or clamp into a captive nut.īecause the Allen wrench fits inside the fixing rather than outside, it is especially useful in confined spaces where a standard wrench, or even a socket, would not be able to reach. By contrast, an Allen wrench fits inside a hexagonal recess. Most wrenches are designed to clamp around the outside of a hexagonal nut or bolt. The following features are crucial to consider when choosing the best Allen wrench set for your needs. In fact, almost every home tool kit for DIY incorporates one. Whether you’re an amateur or a professional, sooner or later an Allen wrench set is likely to be a necessity. Photo: What to Consider When Choosing the Best Allen Wrench Set BEST HEAVY-DUTY: Sunex 2637, 1/2″ Drive Master Impact Hex Driver Set.BEST FOLDING: Stanley STHT71839 Folding Metric and Sae Hex Keys.

