Torx Plus addresses the limitations of the existing Torx system to provide optimal torque transfer and maximises tool lifetime. But Torx is far from perfect which is what led to the development of Torx Plus. Torx Plus DriveĪs shown, Torx clearly outperforms other drive systems when considering factors of importance in production environments. But wide tolerances can present a loose fit between the driver tool and the screw head socket and the 15 degree drive angle can reduce the tool bit life. The straight sides of the Torx six sided star shaped socket helps prevent camout and require lower end-load than cruciform systems. The original Torx specification uses a six point star shaped socket recess in screw heads with a matching Torx screwdriver bit.Ī key advantage of the Torx system is that is allows higher torque transmission than other drive systems enabling fastenings to be tighter and therefore more secure. The nature of this design makes it susceptible to slippage and the damage that this can cause. Torque transmission is limited due to tool misalignment in the slot. This will damage the driver bit and the fastening. Key failings with the slotted drive system include tool misalignment due to the slot head being open at both ends. This style of screw and driver is not appropriate for automated assembly as tool alignment is not automatic. Slotted screw heads which accept flat-bladed screwdriver bits are very familiar. Poor tool engagement reduces torque transmission and can result in concentrated stress which will potentially damage the driver or the fastening. This means that additional pressure is required to keep the driver in the socket which has an impact on wear and tear as well as worker fatigue. But driving forces act to push the driver out of the socket (camout) due to these sloping sides. Sometimes called cross-head, cruciform drives include the well known Phillips and Pozidrive.ĭrivers self align with drive sockets due to the sloping sides of the drive sockets. This localised pressure tends to round off the tool resulting in damage to both the tool and the fastening. When rotational pressure is applied to the tool this is transferred to the points of contact between the hex tool and the drive socket in the screw head. While this style of drive system allows high torque transmission it is prone to early failure. A hexagonal socket in the head of a screw mates with a hexagonal tool (Allen wrench) to tighten or undo the screw. Hex drive fastenings are very well known. Here’s a summary of just some of the issues associated with various typical, commonly used drive systems. For example, an inefficient drive system will increase assembly time and therefore eat into profitability. The drive systems used by various fasteners have a huge impact on productivity and product quality. But this early specification has undergone some beneficial development and improvement highlighted in this post. As previously noted - the original Torx drive system was developed by Camcar Textron in 1967.
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