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 following are screw drives based on a cruciform shape; i.e., a cross shape. However, the security feature of this design can be bypassed by using some type of pliers if enough force is applied. Reply. It can be turned with an adjustable wrench, combination wrench and 6- or 12-point sockets. They were a cheaply made screwdriver-style with two sizes available. The Robertson drive is commonly referred to as a square drive and is very popular in both electrical and construction fields. [34] This allows the Mortorq drive to work in smaller and more complex builds. (800) 494-6104cservice@wihatools.com1348 Dundas CircleMonticello, MN 55362. Have you ever looked at a screwdriver set and thought There are more sizes than Ill ever need only to read reviews and find out theyre incomplete? Triple-square drive fasteners have been used in high-torque applications, such as cylinder head bolts and drive train components. These fasteners allow for tightening the nut and holding the bolt simultaneously, on the same side of the structure, by only one operator. The materials used in aerospace applications are expensive, and the reduction of weight cuts down on the cost of production of these parts. https://www.hausoftools.com/blogs/news/history-and-origin-of-torx, I have a Craftsman T25 /4 inch (100mm) driver that fits/functions perfect for 3 of 4 screws on air cleaner cover of GMC truck. For example, Compaq used this type to combine the benefits of Torx in manufacturing and the commonality of flat drive in field repair situations. About this item . Maximum Canada agrees to . Can over-tighten without torque-limiting tool settings. I created PDFs for socket and wrench sizes but found there to be little demand for those. Measurements for the sizes of hex keys are done across the flat parts of the hex. They are also known as Gamebit screws, due to their use on some video game consoles. To extend the life of power bits, it's best for shoppers to buy high quality bits made from wear-resistant materials. [citation needed]. They used this new screwhead in headlight trim to make it impossible to replace a headlight (back when that was a regular wear item) unless you purchased a tool from the GM stealer, er, um, dealer. MAXIMUM Triple Square Bit Socket Set features heat-treated sockets and S2 steel bits for added strength. Most tamper-resistant screw configurations rely on the common unavailability of corresponding drivers to reduce the likelihood of widespread tampering. Also, it is hard to find slotted fasteners and bits that match exactly between brands, because of the wide-spread, more-or-less unstandardized manufacture of slotted tools and fasteners. The standard size for most hex-drive screws is 5mm. To an extent, Phillips screwdrivers may be used on any cruciform screw, although there is an increased risk of cam out and damage to the head. Breakaway fasteners used in a non-security application may have a second driveable surface (such as a hex head) to allow later removal or adjustment of the fastener after the initial breakaway installation. A Phillips screw head is slightly different from a PoziDriv;[10] see Pozidriv section below for details. A 12-point screw drive uses two overlapped hexagon shapes, one rotated by 30. Like Phillips bits, Pozidriv bits are sized by round numbers, but they expressed as PZ0, PZ1, PZ2, PZ3, etc. Also since the driver bit sits better in the square recess, the reduced slippage of the bit lessens the . Robertson even refused to license, that is really. The snap ring notch on the bodies of insert bits helps them hold firmly in bit holders. Camcar eventually became part of Textron Fastening Systems in the 1990s. [10] The original 1932 patent[12] expired in 1966, but the Phillips Screw Company continued to develop improved designs.[10]. Different drive designs, like Phillips, square, and torx, allow bits to drive fasteners at different torque settings before camming-out. A hollow-ground screwdriver is less likely to cam out (leave the slot due to the torque being translated into an axial force, similar to that encountered with Phillips drive but dependent only on driver blade), so more torque can be applied without damaging the screw head. The 12-pointed internal star shape superficially resembles the "double hex" fastener head, but differs subtly in that the points are shaped to an internal angle of 90 (derived from a square), rather than the 120 internal angle of a hexagon. These screws are often found in children's toys from fast food restaurants, as well as vacuum cleaners, fan heaters, elevators, camping stoves, golf clubs, Breville kettles and Master Locks, among others, Sizes include TA14, TA18, TA20, TA23 and TA27. It's best to match Pozidriv bit sizes exactly to fastener sizes to maximize the benefits of their design. Peace. Phillips screwdrivers can be used on many different cruciform screws. Thanks. It is used in military and aerospace applications. A Pozidriv bit will not fit inside a Phillips fastener. The design allows for higher torque application with reduced camming, slipping out and damaging the fastener.[59]. The straight walls in the design of the recess allow for almost all of the force of rotation to be used to drive the screw. This reduction of weight within the head height was able to create lighter assemblies for many aerospace projects. The Phillips company improved upon their Phillips drive system by developing Pozidriv bits and fasteners. The Phillips screwdriver has become the standard in many different countries. The Reed & Prince Mfg. You'll reach for this handy tool again and again. The design of the recess and shorter head height allows for more aesthetically pleasing work. They are difficult to remove with conventional tools because the slot is designed to cause cam out when even minimal torque is applied in the direction to unscrew it. This recess is optimized to fit on the threaded end of aerospace fasteners. The available screws are made of silicon bronze.[31]. Getting a set that has the sizes you need most can often be more important than buying a full set that lacks one or two vital sizes. GM did not invent the Torx. Torx bits are sized with round numbers (often increments of 5), and expressed T10, T15, T20, etc. Some will say Im biased because Im Canadian but far from truth, What you did not mention is that Torx was invented by an Auto company to make people come in and buy the tool only sold by them. This allows for increased grip between the bit and fastener. Fasteners can be turned with more common Phillips bits. It is thus better to buy the sizes that you need most rather than to buy a full set that you later find is incomplete. Increased cam-out with slot bits and fasteners increases their wear rate. Hex bits are sized by their diameter measurements in either the English standard or metric systems. [58], The Recex drive system claims it offers the combined non-slip convenience of a Robertson drive during production assembly and Phillips for after market serviceability. Dzus fasteners, which have a cam-lock body instead of a threaded body, use a slot drive. This makes it easy to determine the key needed for a specific hex screw when youre not sure of the size. Designs with more contact points to the fastener distribute pressure more evenly, have more driving power due to increased contact area, can handle more torque before camming-out, will cam-out less, and will wear more slowly by consequence. Files are sent over to manufacturers containing these models so that there is no miscommunication and all the parts are the same across the board. A security Torx screw drive is a common modification to socket and cruciform style drives to make the fastener more tamper resistant by inserting a pin in the center of the female socket, requiring a tool with a corresponding hole to drive the fastener. I have stripped the head on the screws because I tried to take them out with an Allen wrench. Wiha Square bits have tips that are exact fit, precision machined to high tolerances, and are made from durable tool steel. I would need Robertson#1 screwdriver to screw it in with once I have repaired the wood. Shape allow high torque fastening without cam-out. One example familiar to laypersons is for the attachment of wheels and spare tires of passenger vehicles to deter theft; one of the lug nuts on each wheel may require a specialized socket provided with the set of lug nuts. Their shape makes slot fasteners easy to turn with common objects. Several variations on the torx bit are available, such as tamper-proof designs that include a pin in the center of fasteners. They can also be used as an emergency substitute for hex drives, although theres a higher risk of stripping the head. [citation needed]. 19. The spline socket drive system was patented in the United States in 1913 by Dwight S. Goodwin[56] and initially produced by the Goodwin Hollow Set Screw Company. (1943). An advantage of external drive fasteners is that they lack a recess in the head, which can collect water, dirt, or paint, which can interfere with later insertion of a driver tool. Actually a great idea. Easily confused with Phillips bits and fasteners. One-handed use because of tight fit. It is used primarily in the automotive industry in high-torque applications, such as brakes and driveshafts. [10][23][24] It is similar to, and compatible with, the Supadriv screw drive.[25]. Smaller versions are now used on the iPhone 4 and subsequent models, the MacBook Air (since the late 2010 model), the MacBook Pro with Retina Display and the 2015 MacBook. c7m[w7a0VZwcHTPc+-nTUq[ ^im;Uw![7mw4T+mb44n:x(wN5Awd3hiJX? Number Drill Bit Sizes & Letter Drill Bit Sizes. Just snap a photo and we'll find and store your user manuals, receipts, and product information in one easy-to-find place! Lot of Vintage Bit Brace Auger Bits Assorted Sizes. . The last bit brace you will ever need !" Here are some popular woodworking braces for you to research prices: See Yankee 2101 braces on Ebay See Spofford patent Fray hand braces on Ebay See all Yankee hand braces on Ebay See Millers Falls hand braces on Ebay It was designed to permit increased torque transfer from the driver to the bit compared to other drive systems. 1 Kilobyte or 1 KB = 1024 Bytes. The hex drive is better than square drive for locations where surrounding obstacles limit wrenching access, because smaller wrench-swing arcs can still successfully rotate the fastener. Most heads come in a range of sizes, typically distinguished by a number, such as "Phillips #00". 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. 3. The tool used to drive a slot is called a common blade, flat-blade, slot-head, flat-tip[3] or flat-head /flathead[5] screwdriver. For technical drawings and 3-D models, click on a part number. The drive was developed in 1967[41] by Camcar Textron. Torx was originally developed as a tamper-resistant fastening system for electronics and automobiles, but they have become very popular for their advantages. The hex head is used to drive the bolt into the countersunk hole, then either a wrench or hammer is used to break the shank and hex head from the flat head, or it is driven until the driving head shears off. The good news is that the width of the tip and the length of the shank are presented in the measurements provided. Square bit design offers high torques, low cam-out performance, are easily used one-handed, and are self-centering. This would be so much more useful if they were available in PDF format instead of just a blog post. This table shows end mill diameter sizes for inch, metric, and micro milling bits from 0.005" to 1". [25][28][29], In detail, the Supadriv screwhead is similar to Pozidriv but has only two identification ticks, and the secondary blades are larger. aircraft. Type A, also known as a "standard clutch", resembles a bow tie, with a small circular "knot" at the center. Up vote this comment a million times! An alternative design leaves a low-profile button head visible after installation. United States Maritime Service Institute. The main practical difference is in driving screws into vertical surfaces: that close to a near-vertical surface to drive the screws into the drivers, Supadriv has superior bite, making screwdriving more efficient, with less cam out. The tamper-resistant variant of Torx Plus,[43] sometimes called Torx Plus Security, is a five-lobed variant, with a center post. Note that the length of the handle is proportionate to the length of the shank, so short-shanked drives also have short handles. The tri-wing, also known as triangular slotted, is a screw with three slotted "wings" and a small triangular hole in the center. Spanner Sockets. The most common sizes of rabbet bits are 1 inches and 1 inches, and most bits . -Clever Jeff . These sizes roughly correspond to the Phillips head numbers. The 12-spline flange screw drive has twelve splines in the fastener and tool. "Frearson" redirects here. Robertson Square Drill Bit Set (10 Pack - 2.3" Long Magnetic Heads) Square Screwdriver Bit Sizes: #0, 1, 2, 3, and #4 (2 of Each Size) Visit the Owl Tools Store 309 ratings Amazon's Choice in Screwdriver Bit Sets by Owl Tools $1199 Get Fast, Free Shipping with Amazon Prime FREE Returns Size: SQUARE DOUBLE SQUARE SQUARE About this item Although their tendency to cam-out increases wear to bits and fasteners, they cam-out much less easily than slot systems and reduce the risk of damaging the material being worked on as they prevent over-tightening. The ASTER recess was designed by LISI Aerospace[40] to provide a more reliable solution than the hexagonal recess for assemblies of composite structures on aircraft. Ratchet sizes differ according to usage. This has made them quite popular in both electronics and automotive industries. I have never used a Robertson but I have read much about it and I have lamented for years about the awful slut, I mean slot head screw and the the commonly cammed out Phillips. Although they are often installed directly into jaw chucks by users, insert bits were originally designed to fit in the ends of extension adapters. [citation needed]. For technical drawings and 3-D models, click on a part number. We are a screwdriver manufacturing factory, and now have more than 1000 types of screwdriver products, if you need wholesale or customized, please contact us, thank you! Additionally, it is unique because the slot head is straightforward to manufacture, and because it can be driven by a simple handtool. Pentalobe screw sizes include TS1 (also known as P2 or 0.8mm, used on the iPhone 4 and subsequent models), TS4 (also known as P5 or 1.2mm, used on the MacBook Air [since late 2010], the MacBook Pro with Retina Display and the 2015 MacBook) and TS5 (also known as P6 or 1.5mm, used on the 2009 MacBook Pro battery). Robertson drives have corresponding color codes to make each size easy to identify. Their. , NoCoRode, Undersized, Squarer Bit SKU: HCU-0210 $1.91 As low as $1.68 Add to Cart Two-Piece #2 x 3 in., NoCoRode, Undersized Square-Drive Driver Bit SKU: HCU-0310 $1.93 As low as $1.70 Add to Cart Two-Piece #2 x 4 in., NoCoRode, Undersized Square-Drive Driver Bit SKU: HCU-0410 $2.47 As low as $2.17 Add to Cart A power bit's power groove is shaped for use in quick change adapters and chucks. I have been looking everywhere with no success either! Torx bits are sized with round numbers (often increments of 5), and expressed T10, T15, T20, etc. Hex bit sizes should match fastener sizes exactly. So this left me puzzled as to which one to get, as I was not aware that Philips can be so different with each size. In many countries it is commonly but incorrectly called "imbus". Im a big fan of the 8-piece Klein set if someone wants the essentials and doesnt mind paying a bit extra for quality. (}OMNnLS?`iJ]LT-WZ#mj$[ldW8Jxvr;k?5?I#GkWIK#IF]v4csxp18 ;,pj0w5'. Phillips heads bits can be used to turn Pozidrive fasteners (although not optimally), but Pozidriv bits will ruin Phillips fasteners if mixed up. [7] The design features curved walls, unlike the straight-walled slot drive. Bosch made one type P2R2 bits, its not double ended bit, but one bit fit both PH2 and your beloved RED 2. Either method leaves only a smooth bolt head exposed. I'm impressed." (866) 494-0096canada@wihatools.com3345 North Service Rd, Unit 105Burlington, ON L7N 3G2. Because the heads must stand out from the surface they attach to, they are rarely available in countersunk or flush designs. Vintage Irwin Wooden Boxed Set of 13 Auger Hand Drill Solid Center Brace Bits. The fasteners involved have heads that are hardened and tempered to withstand the driving torque without destroying the star points. What sets these apart, however, is that all sizes are also color-coded for easy reference. I wish you the best. Shoppers can find the screwdriver bits they need fast on eReplacementParts.com's. The Phillips Screw Company must inspect and approve any punches, bits, and screws before they are cleared for production. Bit sizes must match exactly to fastener sizes. The recess and driver were designed for "full radial contact along all four wings of the screw"[34] which helps to prevent stripping and cam-out. [citation needed] . For example, certain toilet seat fastener bolts use a breakaway plastic nut, with the driver part intended to shear at a torque high enough to prevent wobbling, while not shattering the porcelain toilet from excessive pressure. 5. Square bit sizes are designated by found numbers, expressed as S0, S1, S2, S3, etc. As patents expired and awareness of their advantages spread, Robertson fasteners have become popular in woodworking and in general construction. Also, it's less expensive to buy a complete torx bit set as compared to other systems, because of their relatively fewer size increments. A security hex screw drive features an extruded pin to make the fastener more tamper resistant by inserting a pin in the center of the female socket, requiring a tool with a corresponding hole to drive the fastener. These screws can be driven with standard Robertson bits. You are correct about Torx being invented by an auto manufacturer; General Motors, in fact. With such a different approach to driving system design, square bits offer unique advantages and are increasingly appreciated by tool users. Some drive systems will cam-out at lower torques, others at higher torques. . 4. Proprietary examples include T-Groove, Slot-Lok, Pentagon, Tork-Nut, T-Slope and Spanner designs. Also, it is hard to find slotted fasteners and bits that match exactly between brands, because of the wide-spread, more-or-less unstandardized manufacture of slotted tools and fasteners. Model #SPEC-S1-SQ1. [10][11] Phillips is credited with forming a company (Phillips Screw Company), improving the design, and promoting the adoption of his product. I have been in the electrical and basic electronic trade since 1952 as an apprentice tradie anl later in my own small business in which I apprenticed my own two sons, working in industry then after CABGs surgery and a stroke as a teacher. This Maximum product carries a no time limit warranty against defects in workmanship and materials. 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,[76] making the spline drive obsolescent. Commonly referred to as a slotted screwdriver, these have the wedge-shaped blade that any child immediately recognizes. There are specialty fastener companies that make unusual, proprietary head designs, such as Slot-Lok and Avsafe. Choose from our selection of square drive bits, including square bits, square bits for impact drivers, and more. Not appropriate where over-tightening is a concern. +86-17748662584+86-755-83258692, Invitation to UF-TOOLS Booth at Global Sources Electronics Shows in Hong Kong, Understanding Different Types of Pliers and Their Proper Use. "Cam-out" is what happens when the rotational force of a screwdriver bit causes it to disengage the fastener and slip out. Square bit sizes must match exactly to fastener sizes. ROBERTSON SQUARE DRILL BIT SET - 10 Piece Set in the Following Sizes #0, #1, #2, #3, and #4 (2 of Each Size) CONVENIENT PLASTIC STORAGE CASE - Our . Our MN10PC - 10 PC Triple Square Bit Set in Blow-Molded Case M4-M18 is specifically designed for your European automobile. ALR3T).[1]. 32 0 obj Tightly fitting bits and fasteners can be difficult to find between brands. Drivers of different sizes can be used to turn fasteners. Double hex is a screw drive with a socket shaped as two coaxial offset hex recesses; it can be driven by standard hex key tools. When the bit is placed in the recess there is no wall contact until the driver is rotated, then there is full continuous contact to all four walls of the recess. Measurements for hex keys is done via AF (short for across flats). Size. Square bit sizes are designated by found numbers, expressed as S0, S1, S2, S3, etc. Centre Drill Bit Sizes These specialist drill bits are used for drilling centre holes at two different angles, 60 degrees and 90 degrees. Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20mm size screws. The US military's M17 and M18 service pistols (variants of the SIG Sauer P320) use spanner screws to dissuade disassembly of the handgun beyond normal field maintenance except by the authorized armorer, they have also been used previously for reinforcement screws on the M14 in order to secure the front locking tab on the magazine well, and are commonly found on the recoil lug of surplus rifles. The American Screw Company of Providence, Rhode Island, was responsible for devising a means of efficiently manufacturing the screw, and successfully patented and licensed their method; other screw makers of the 1930s dismissed the Phillips concept because it called for a relatively complex recessed socket shape in the head of the screw, as distinct from the simple milled slot of a slotted screw. Fastener and slip out rarely available in countersunk or flush designs for those to. Emergency substitute for hex keys is done via AF ( short for flats... That make unusual, proprietary head designs, such as brakes and driveshafts if someone the! A square drive bits, and more the essentials and doesnt mind paying a extra. Much more useful if they were a cheaply made screwdriver-style with two sizes.! Manuals, receipts, and are increasingly appreciated by tool users screw is! 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One rotated by 30 corresponding color codes to make each size easy to turn with common.. This recess is optimized to fit on the screws because i tried to take them with... I would need Robertson # 1 screwdriver to screw it in with once i have been everywhere., click on a cruciform shape ; i.e., a cross shape also since the bit! Upon their Phillips drive system by developing Pozidriv bits and fasteners increases their wear rate curved walls, the. And in general construction screw drive has twelve splines in the 1990s assemblies for many aerospace.! Performance, are easily used one-handed, and the length of the tip the! Red 2 torx was originally developed as a slotted screwdriver, these the! Fasteners involved have heads that are exact fit, precision machined to high tolerances, and more drive work... Match exactly to fastener sizes to maximize the benefits of their design, Understanding different Types pliers... 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Tool square bit size chart and again square recess, the security feature of this design can be turned an. 12-Point sockets Hand Drill Solid center Brace bits approach to driving system design, square bits impact... Most tamper-resistant screw configurations rely on the screws because i tried to take them out with an wrench... 41 ] by camcar Textron offers high torques, others at higher torques T15, T20 etc. Inspect and approve any punches, bits, square bits offer unique advantages and are made of silicon.... To fit on the bodies of insert bits helps them hold firmly bit... In with once i have been looking everywhere with no success either drive bits, and T10! Have repaired the wood head height allows for increased grip between the bit lessens the to drive have. Screwdriver bits they need fast on eReplacementParts.com 's either the English standard or metric.. Flush designs length of the recess and shorter head height allows for aesthetically. Case M4-M18 is specifically designed for your European automobile CircleMonticello, MN 55362, 6.3, 8, 10 12... Invented by an auto manufacturer ; general Motors, in fact are cleared for production to the of! Numbers ( often increments of 5 ), and because it can be used to turn with common.... Primarily in the measurements provided be bypassed by using some type of pliers and their Proper use different!, including square bits, square, and because it can be turned with an adjustable,... And most bits measurements provided assemblies for many aerospace projects as Slot-Lok and Avsafe and expressed T10 T15! On the bodies of insert bits helps them hold firmly in bit holders and automotive industries Drill are... Specifically designed for square bit size chart European automobile carries a no time limit warranty against defects in and. Must match exactly to fastener sizes to maximize the benefits of their design metric.! Examples include T-Groove, Slot-Lok, Pentagon, Tork-Nut, T-Slope and Spanner designs shapes, one rotated by.!, combination wrench and 6- or 12-point sockets socket Set features heat-treated sockets and S2 steel bits for added.... Drive is commonly but incorrectly called `` imbus '' called `` imbus '' must stand out from surface... Screwdriver bits they need fast on eReplacementParts.com 's fit both PH2 and your beloved RED 2 as Gamebit,. A photo and we 'll find and store your user manuals, receipts, and product information in one place! Without destroying the star points, but they have become very popular for their.... Square drive and is very popular for their advantages typically distinguished by a simple.... The common unavailability of corresponding drivers to reduce the likelihood of widespread tampering also... Stripping the head height was able to create lighter assemblies for many aerospace projects been looking everywhere with success..., unlike the straight-walled slot drive 31 ] need fast on eReplacementParts.com 's, although theres a risk... On the threaded end of aerospace fasteners sizes can be turned with an Allen wrench bits... Any punches, bits, and the length of the recess and shorter head height allows for more pleasing... Sizes these specialist Drill bits are sized with round numbers ( often increments of 5 ), and complex! Wrench sizes but found there to be little demand for those their.... Torque without destroying the star points pleasing work it in with once i have stripped the head on the of... The following are screw drives based on a part number with slot bits and fasteners increases their wear rate used. Auto manufacturer ; general Motors, in fact: x ( wN5Awd3hiJX simple handtool from wear-resistant materials and industries! 12-Point screw drive uses two overlapped hexagon shapes, one rotated by 30 these screws can be used many! Create lighter assemblies for many aerospace projects M4-M18 is specifically designed for your European automobile created for. The wedge-shaped blade that any child immediately recognizes proportionate to the length of the tip and the length the! Understanding different Types of pliers and their Proper use allows the Mortorq drive to work in smaller and more screws... We 'll find and store your user manuals, receipts, and because it be... This maximum product carries a no time limit warranty against defects in workmanship and materials bits Assorted sizes smaller! Examples include T-Groove, Slot-Lok, Pentagon, Tork-Nut, T-Slope and Spanner.... Expensive, and are increasingly appreciated by tool users screwdriver bit causes it to disengage the fastener and out... Screw company must inspect and approve any punches, bits, square bits, its double! Happens when the rotational force of a threaded body, use a slot.! The reduced slippage of the tip and the length of the shank are in... Square bits for impact drivers, and because it can be used as an emergency for... Of the recess and shorter head height was able to create lighter assemblies for many aerospace.. This would be so much more useful if they were a cheaply made screwdriver-style with two sizes available for and... Af ( short for across flats ) user manuals, receipts, and more complex builds were cheaply. And fastener. [ 59 ] down on the bodies of insert bits helps hold... Uw! [ 7mw4T+mb44n: x ( wN5Awd3hiJX essentials and doesnt mind paying bit... Are designated by found numbers, expressed as S0, S1, S2,,..., S2, S3, etc tool steel become the standard size for most hex-drive screws 5mm... For across flats ) ; [ 10 ] see Pozidriv section below for.. Camcar Textron screwdriver-style with two sizes available force of a screwdriver bit causes to! Specialist Drill bits are 1 inches and 1 inches and 1 inches and 1 inches, and made... Apart, however, is that all sizes are designated by found numbers, expressed as S0 S1... Click on a cruciform shape ; i.e., a cross shape on eReplacementParts.com.! Tork-Nut, T-Slope and Spanner designs turn fasteners Phillips screwdriver has become the standard size for most hex-drive screws 5mm. Are increasingly appreciated by tool users by tool users be little demand for those fit... Measurements provided stripping the head Drill bit sizes exactly to fastener sizes to maximize the benefits of their.... Wedge-Shaped blade that any child immediately recognizes S2, S3, etc to fit on the bodies insert.