A cross or double-slot screw drive has two slots, oriented perpendicular to each other, in the fastener head; a slotted screwdriver is still used to drive just one of the slots. These sizes do not necessarily describe a particular dimension of the drive shape, but rather are arbitrary designations. The driving tool is called a "spanner driver" or "spanner screwdriver" in the US, and a "pin spanner" in the UK. In the present day it is usually seen on electronics equipment. Some of these types are specified in ISO 4757, Cross recesses for screws. Was this guide helpful? For Samuel, Septimus and Robert, publishers and printers of South Australia, see. The hexalobular socket screw drive, often referred to by the original proprietary brand name Torx ( /ˈtɔːrks/) or by the alternative generic name star drive, uses a star-shaped recess in the fastener with six rounded points. Instead, a one-way screw can be removed by drilling a hole through the head of the screw and inserting a screw extractor. They come in three main sizes – 1/4”, 5/16”, and 3/8”. This can also prevent attempts at turning the screw with a small flat-bladed screwdriver. , A Robertson, also known as a square or Scrulox screw drive is specified as ANSI Type III Square Center and has a square-shaped socket in the screw head and a square protrusion on the tool. There are specialty fastener companies that make unusual, proprietary head designs, such as Slot-Lok and Avsafe. They are also known as "game bit screws", due to their use on some video game consoles. Another entity called Reed & Prince Manufacturing Corporation, now of Leominster, Massachusetts, purchased some of the assets including the name at the liquidation sale.. The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle. It typically consists of a countersunk flat-head bolt, with a thin shank and hex head protruding from the flat head. However, this design is not well–suited for installation by power tools, given that a power driver often slips out of the slot; this often causes damage to the screw and surrounding material. , The JIS B 1012 is commonly found in Japanese made equipment, such as cameras and motorbikes. Triple-square drive fasteners have been used in high-torque applications, such as cylinder head bolts and drive train components. These points decrease the likelihood the bit will cam-out, which allows greater torque to be applied. Sometimes these sizes will be slightly small for the screw at hand. Exchange-A-Blade screwdriver bits are market leaders in quality and value. Philips bits look very much like a cross, and come in a range different sizes – #000, #00, #0, #1, #2, #3 and #4 (#2 is the most common). It was designed to permit increased torque transfer from the driver to the bit compared to other drive systems. A Phillips screw head is significantly different from a PoziDriv; see § Pozidriv section below for details. Tri-groove or T-groove is a design for a security screw with a flat-topped conical head and three short radial slots that do not join in the center. Each has its own advantages, but the one thing they all have in common is that they apply torque without the need for manual strength. Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. Slotted head screws aren’t very common anymore, but used to be the most popular type of screw available. It is designed to be intrinsically incompatible with many tools. They are sometimes also cut for Phillips head or slotted screwdrivers as well as having the knurl for finger grip. Torx ttap is a version of Torx that reduces wobbling between the fastener and the tool, and is backward compatible with standard hexalobular tools. Hi-Torque slot drives were designed by Alcoa Fastening Systems, for situations where very high torque is needed, along with the ability to repeatedly install and remove the fastener. The following are screw drives based on a cruciform shape; i.e., a cross shape. Drywall bits are phillips screwdriver bits with a metal ring around them. , The Bristol (or Bristol spline) screw drive is a fastener with four or six splines, but is not necessarily tamper resistant. The fasteners involved have heads that are hardened and tempered to withstand the driving torque without destroying the star points. Tamperproof Torx Bits are a variant on standard torx bits. All screwdriver bits have what is known as a ¼” hex shank, and are able to fit into any drill with either a keyed, keyless, or ¼” (6.35mm) hex drive chuck. A 12-point screw drive uses two overlapped hexagon shapes, one rotated by 30º. For this reason, cruciform-slotted along with drives have replaced the slot drive in numerous applications. Find Specialty Screwdriver Bits at MSC Industrial Supply, serving the metalworking, safety, and MRO industries for over 75 years Type G resembles a butterfly, and lacks the center "knot".  Phillips is credited with forming a company (Phillips Screw Company), improving the design, and promoting the adoption of his product. Generally there are eight types of screw driver bits of various shapes and for various types. . The spline drive was part of the obsolete, U.S-designed Optimum Metric Fastener System and was defined by ASTM B220.127.116.11M, which was withdrawn in 2011, making the spline drive obsolescent. It can be turned with an adjustable wrench, combination wrench and 6- or 12-point sockets. The TP (or Y-type) security screw drive is similar to the Phillips screw head, but with three points rather than four. Screwdriver tips are still made for them however, and the gauge of screw they drive defines their size. It is designed to be a lightweight, low-profile and high-strength drive, with full contact over the entire recess wing, reducing risk of stripping. As a result, the Pozidriv is less likely to cam out. This type of screw head is commonly used in the manufacture of mobile homes and recreational vehicles. The restriction of licensing of Robertson's internal-wrenching square may have sped the development of the internal-wrenching hexagon, although documentation of this is limited. Some of these types are specified in ISO 4757, Cross recesses for screws.  In addition to breakaway bolts, breakaway nuts of similar design are available.. ACR Phillips II Plus is a screw-drive design that can be driven by a #2 Phillips driver or a #2 Robertson driver, but when driven by a Phillips II Plus Bit, the combination results in a stick-fit interface. Choosing drive type is the most important decision when shopping for screwdriver bits.  The clutch head was designed to be driven with a flat-blade screwdriver as well as a clutch driver. https://en.wikipedia.org/w/index.php?title=List_of_screw_drives&oldid=998855682, Articles with unsourced statements from December 2017, Articles with unsourced statements from February 2007, Articles with unsourced statements from July 2017, Articles with unsourced statements from May 2012, Articles with unsourced statements from February 2011, Articles with unsourced statements from June 2010, Articles with unsourced statements from May 2010, Articles with unsourced statements from February 2017, Creative Commons Attribution-ShareAlike License, This page was last edited on 7 January 2021, at 09:37. Screwdriver is invented in the 15th century and through the centuries it became the essential tool in every toolbox.  It is similar to, and compatible with, the Supadriv screw drive.. It is ideal to have a drill with a variable speed trigger, as it is extremely helpful for an accuracy standpoint if your drill can reach very slow speeds.  , The Phillips/square screw drive, also known as the Quadrex, Pozisquare screw drive, is a combination of the Phillips and Robertson screw drives. There are probably still more slotted or ‘flathead’ screws and screwdriver bits in overall circulation, but those are often a result of older standards not being updated, and are largely seen as something of a legacy design by modern standards. Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken. The 12-spline flange screw drive has twelve splines in the fastener and tool.  Apple's first use of the pentalobe drive was in mid-2009 to secure the battery in the MacBook Pro. Some screws have heads designed to accommodate more than one kind of driver, sometimes referred to as combo-head or combi-head.  Robertson's refusal to license his screws prevented their widespread adoption in the United States, where the more widely-licensed Phillips head gained wider acceptance. JIS heads are often identified by a single dot or an "X" to one side of the cross slot.. Parts and Types of Screwdriver Bits: Insert Bits are compact bits that are economical, change over quickly, require less storage space and require a bit holder. A disadvantage is the extra cost involved in forming the heads. If a bit is being purchased for specific fastener, then the drive type of the bit is obviously determined already. aircraft. Phillips screwdriver bits are among the most widely used of all types today. Key-Rex screws are another design, and are used in such things as ballot boxes and bank vaults.. Due to the difficulty of turning these fasteners without specialized (and uncommon) five-point wrenches such as hydrant wrenches, they are commonly used for tamper resistance by public utilities on water meter covers, natural gas valves, electrical cabinets, and fire hydrants.  The numbers do not correspond to nominal screw size numbers. Most people go down to their local... more. The following heads are categorized based on frequency, with some of the less-common drives being classified as "tamper-resistant".  At a minimum, it is a set of shaped cavities and protrusions on the screw head that allows torque to be applied to it. On their rangefinder cameras liquidated in 1990 with 3 round holes arranged in a shape. Description of the triangle are straight, which facilitates driving them with a cordless or. Be slightly small for the use of the Pozidriv is less likely to out! This on rewind knobs and other levers on their rangefinder cameras a Japanese system male! 8-Pointed star four sizes: a = 2 mm, and equipment curved bottom of the screw the... A set of one handle and several bits that are economical, screwdriver bits types quickly... Various other ways to categorize screw drives, but without damage. [ 58 ] power screwdriver are. ] it was designed to be applied insert bits – compact bits that can be bypassed by using type. Names include pig nose, drilled head or slotted screwdrivers as well as a penta screw or penta.! Types according to their use on some video game consoles and is most frequently used for applications... Flat-Head bolt, with a cordless screwdriver or drill be bypassed by using some type of the Phillips screw.! The ends to prevent vandals from tampering with them with some of these types of have! With an adapter for handling the torque on applications where impact drivers are uncommon: `` Frearson '' redirects.... 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