Other combinations are a Phillips and Robertson, a Robertson and a slotted, a Torx and a slotted and a triple-drive screw that can take a slotted, Phillips or a Robertson. The polydrive screw drive, also known as RIBE, [74] is spline-shaped with rounded ends in the fastener head. The tool has six flat teeth at equal spacing; the sizes are determined by the diameter of the star points. Its primary advantage over older screw drives is that it resists cam out. It is used primarily in the automotive industry in high-torque applications, such as brakes and driveshafts. The 12-spline flange screw drive has twelve splines in the fastener and tool. It consists of 12 equally spaced protrusions, each with a 60° angle. It is achieved overlaying 4 equilateral triangles, each one rotated 30° over the previous one. The spline drive was part of the obsolete, U.S-designed Optimum Metric Fastener System and was defined by ASTM B18.2.7.1M, which was withdrawn in 2011, [81] making the spline drive obsolescent.

Avsafe". www.losspreventionfasteners.com. Archived from the original on 2017-03-01 . Retrieved 2017-02-28. Tork-Nuts". Loss Prevention Fasteners. Ultra Fasteners Inc. Archived from the original on 2015-09-26 . Retrieved 2015-09-25. Wilder, George. "What are the differences between the two types of drive– Phillips and Posidriv?" (PDF). v8register. Archived (PDF) from the original on 2016-04-09 . Retrieved 2017-09-02. A thumbscrew is a type of screw drive with either a tall head and ridged or knurled sides, or a key-like flat-sided vertical head. They are intended to be tightened and loosened by hand, and are usually not found in structural applications. They are sometimes also cut for Phillips head or slotted screwdrivers, as well as having the knurling for finger grip. ASME Standard 18.6.8 covers dimensions for Type A (shoulder under the head), regular and heavy, along with Type B (without shoulder), regular and heavy. They can be found on many computer cases, and in other locations where easy access without tools is desired. Care should be taken not to confuse the name of this pattern with the casual phrase "spline head" which usually refers to the XZN pattern.Tri-point Y000 Screwdriver (for Apple Watch and iPhone 7)". iFixit. Archived from the original on 16 October 2021 . Retrieved 28 February 2017. ISO 4754-1983(E) Cross recesses for screws" (PDF). Archived from the original (PDF) on April 30, 2023 . Retrieved October 1, 2023.

Also known as an ECX or Combination Tip drive. A combined slotted and Robertson drive screw found in electrical power equipment and distribution equipment. The design allows for higher torque application with reduced camming, slipping out and damaging the fastener. [63] The ECX drive is not compatible with older combination Phillips and slotted head screws. [64] Although Milwaukee Electric Tool holds the trade name ECX, their marketing materials do not tell what type of screw head ECX is designed to fit. [50] Clutch [ edit ]

About Bristol Wrench Spline Drive Bits". 2016-10-21. Archived from the original on 2016-10-21 . Retrieved 2019-11-23.