This drive type has the disadvantage of not being as precisely controlled as can be obtained by proper use of a torque wrench; applications may still fail due to either too little torque being applied to correctly fasten the joint, or too much torque being required to shear the head, resulting in damage to the material being fastened. [ citation needed] Line Head and Line Recess [ edit ] Line head driver sizes [1] Internal

Sizes are: M4, M5, M6, (M7), M8, (M9), M10, (M11), M12, (M13), M14, (M15), M16, (M17) and M18 (the sizes in parentheses are less commonly used, but they do exist). Despite the similar naming scheme to metric fasteners, there is no correlation between the name of the size and the dimensions of the tool. Some sizes (at least M14, M16, M18) are also available in a tamperproof version (with a center hole)

a b "Tork-Bolts". Loss Prevention Fasteners. Ultra Fasteners Inc. Archived from the original on 2015-09-26 . Retrieved 2015-09-25.

Yankee Screwdriver: Instead of using ball bearings, this screwdriver uses a spring-loaded mechanism. Instead of twisting the screw with your wrist, you place the screw head against the screw and push it to tighten. As its name indicates these types of screwdrivers are used for tightening or loosening different types of screws. These are available in small as well as larger sizes. Flathead screwdrivers have a handle of wood or plastic fixed to them. Digest, Reader's (2003). Family Handyman Best Projects, Tips and Tools. Reader's Digest. p.106. ISBN 978-0-7621-0455-0. Archived from the original on 2016-12-24 . Retrieved 2016-09-24. ISO 8764-1:2004(E) Assembly tools for screws and nuts — Screwdrivers for cross-recessed head screws — Part 1: Driver tips" (PDF). Archived (PDF) from the original on 2023-04-30 . Retrieved 2023-05-01. Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20mm size screws. [82] Its primary advantage is its ability to resist cam out, so it is used in high-torque applications, such as tamper-proof lug nuts, cylinder head bolts, and other engine bolts.

McMaster-Carr catalog (116thed.). p.3056. Archived from the original on 2019-12-14 . Retrieved 2010-05-06. Needs login Apple uses Y-type screws to secure the battery on the 2010 and 2011 MacBook Pro, as well as an extremely small type in the Apple Watch, iPhone 7 and iPhone X. [87] [88] This style of screw is often called a "tri-wing", although that name more properly belongs to a different design (see below). Combination drives [ edit ] Example of a combination drive system. At center, a Torx T25/slot Dual Drive screw; at left, a 3⁄ 16-inch (4.8mm) flat-blade screwdriver; at right, a T25 screwdriver. The screw will accept either screwdriver. 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.

In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2mm, 4.6mm, 6.4mm and 7.7mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DCT-20 and DTC-27.

a b c "Unterschied zwischen Pozidrive und Superdrive"[Difference between Pozidriv and Supadriv] (in German). Goedkopeschroevenkopen.nl. Archived from the original on February 22, 2014 . Retrieved 2014-03-20.