Today, cold forming (by stamping in a die) is still the common method used for most screws sold, although rotary broaching is also common now. Through our modern manufacturing technology, ongoing product development programs, highly skilled and dedicated people and enduring commitment to excellence, Robertson Inc. continues to build on our heritage of quality and innovation.Robertson Inc., A Marmon/Berkshire Hathaway Company | Robertson Inc., © 2017 | All Rights Reserved, Today, Robertson Inc. is a global supplier of standard and specialty fasteners with locations throughout the world. Most of the following screw drives are considered tamper-resistant because of their obscurity. The spline drive was part of the obsolete, U.S-designed Optimum Metric Fastener System and was defined by ASTM B22.214.171.124M, which was withdrawn in 2011, making the spline drive obsolescent. $14.99 $ 14. . But that is only the tip of the screwy iceberg. The bottom of the recess is flat, and the point of the driver has to be blunt. The line screw drive is a Japanese system with male, female and female tamper-resistant screw configurations. View Details. Two sizes of Robertson will fit the majority of screws used in general working. Add To Cart. Pan head robertson type A tapping screw, bulk. His special square-headed screw … Add to Cart. They are commonly found on German vehicles such as BMW, Opel, Mercedes, Porsche and those from the Volkswagen Group (Audi, Seat, Skoda, and Volkswagen).. Either the screw or the driver or both. Because of this, a regular Phillips or flat-blade screwdriver will not fit the head. The yellow #0 drive bit is 1” long and is for screw sizes #3 and #4. A thing of beauty for Canadian woodworkers because that recessed square won't let you slip out. All have 1/4" hex shanks. View as Grid List. In addition to screw drives, various nut drives have been designed to make removal difficult without specialized tools. The Robertson square-drive: a screw topped with a square hole ready to receive its matching hand driver. As one of the industry's leading fastener manufactures, we’re proud of our accomplishments to date. per page. 1, 250g Mixed Pack of Robertson Square Drive Head Wood & Self-Tapping Screws. Add To Cart. Black drivers function with the largest screws, types 12 and higher, which are 4.81 to 4.85 mm in size. Slot screws are also used in the restoration of antique furniture, vehicles, and equipment. PZ1 is normally used on screw diameters from 2-3mm, PZ2 from 3.5-5mm and PZ3 from 5.5mm to 8mm. The design is similar to that of the double-square—in both cases, the idea being that it resembles a square (Robertson) but can be engaged at more frequent angles by the driver bit. Variants with a pin in the center are often found in game systems, to discourage improvised attempts to use a slotted screwdriver to drive the fastener. The fasteners are commonly called "line head screws". Amazon's Choice for robertson screwdriver. 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. They renamed the company, Bureau de normalisation de l'aéronautique et de l'espace, the development of the internal-wrenching hexagon, "When a Phillips is not a Phillips Plus So Much More!".  It is similar to, and compatible with, the Supadriv screw drive.. Robertson Square Bits. , 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. Robertson Screw No 3.5 Full Thread Pan Head Zinc - 30mm long £5.46 ex. Inventors: Raabe, Rodney D. (Swisher, IA, US ... a circuit breaker having a headless wire binding screw with a Robertson drive is sold only in Canada). The camera company Leica Camera has used versions of this on rewind knobs and other levers on their rangefinder cameras. 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 type screw.  The design features curved walls, unlike the straight-walled slot drive. Robertson screws and screwdrivers carry his name to this day. Standard 12-point hex socket bits and wrenches fit these screws. 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. 5.0 out of 5 stars 6. . As a tradesman are you telling me that you would not use the proper tool for the job - surely not! Phillips drive bits are often designated by the letters "PH", plus a size code 0000, 000, 00, 0, 1, 2, 3, or 4 (in order of increasing size); the numerical bit size codes do not necessarily correspond to nominal screw size numbers.. , The breakaway head (also called breakoff or shear fastener) is a high-security fastener whose head breaks off during installation, during or immediately after the driving process, to leave only a smooth surface. 100 x 50mm Decking Screws - High Performance Robertson Square Drive Gash Point. They are potentially capable of allowing more torque than a six-point, but greater demands are placed on the metallurgy of the heads and the tools used, to avoid rounding off and slippage. For his invention, P.L. BUILDING TOWARDS THE FUTURE. Robertson Square Drill Bit Set (PREMIUM Complete 12pc Set) /w Storage ... $25 shipped by Amazon. The design was adopted by some parts of the aerospace industry, led by Lockheed in the early 1970s on the L-1011, but met with mixed results due to complaints of insert damage during installation. 2 in (5) Items (5) 4 in (6) Items (6) Not Specified (1) Items (1) see all. It is used in military and aerospace applications. Here at Robertson Inc., we construct the complete Robertson® Fastener System that PL Robertson invented over 100 years ago – The Original Robertson® Drive. The Original Robertson. This can also prevent attempts at turning the screw with a small flat-bladed screwdriver. 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. This type of drive is commonly used in avionics, higher-end communications equipment, cameras, air brakes, construction and farm equipment, astronomy equipment, and military equipment. Superficially it looks like a Phillips screw with narrower and more vertical slots, to give less tendency to cam out.  One advantage over the Phillips drive is that one driver or bit fits all screw sizes. The most common sizes in use for consumer electronics are DCT-20 and DTC-27. The alloy-steel blade is heat treated to ensure strength and is plated with a Chrome-nickel finish to ensure a corrosion resistant tool. £3.25 New. For attaching hardware to wood, smaller #4 or #5 screws are often used. 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. In stock and ready to ship. It is achieved overlaying 4 equilateral triangles, each one rotated 30° over the previous one. Dzus fasteners, which have a cam-lock body instead of a threaded body, use a slot drive. Compared to an Allen drive, Bristol drives are less likely to strip for the same amount of torque; however, the Bristol drive is not much more strip-resistant than a Torx drive. "JIS" standardized cruciform-blade screwdrivers are available for this type of screw, and should always be used to avoid head and driver damage.  The first patent was issued in 1909 and the last patent expired 55 years later in 1964. A correctly sized JIS driver will engage at full depth into a Phillips or Pozidriv head screw slightly loosely, but without damage. As a result, the Pozidriv is less likely to cam out. Four-point socket wrenches do exist. A hex key should not be used where a key of square cross-section is the correct fit. Could be a #2 Robertson or a #2 Phillips or a T20. 99. The description of the Pozidriv head applies also to Supadriv. Fasten joints and other pieces with anti-corrosion, galvanized robertsons screws at Alibaba.com. These robertsons screws are tough, durable and work brilliantly as fasteners. 12 &14 3/16" 4.81–4.85 mm (0.189–0.191 in) Blue (#4) No. SDS Document Not Found. The Robertson screw has been mostly confined to – and is standard - in Canada for over 100 years – apart from the fact that it is now being manufactured in Jiaxing, Zhejiang, China, that is. The Robertson square-drive: a screw topped with a square hole ready to receive its matching hand driver. The design is similar to a square drive (Robertson), but can be engaged at more frequent angles by the driver bit. The ASTER recess was designed by LISI Aerospace to provide a more reliable solution than the hexagonal recess for assemblies of composite structures on aircraft. Reed and Prince, also called Frearson , is another historic cross-head screw configuration. In other words, three Robertson squares are superimposed at a successive 30° rotation. It is easier to install and remove than a Phillips screw and does not strip the head as easily. Sort By. , The Bristol (or Bristol spline) screw drive is a fastener with four or six splines, but is not necessarily tamper resistant. Robertson screw. In practice, drivers for the fasteners may or may not interchange, but should be examined carefully for proper fit before application of force. Get it as soon as Thu, Dec 10. Add to Cart. The patent was assigned to Lockheed. Robertson … The chart below outlines the correct screwdriver bit for the most popular screw gauges.  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. Four-point socket wrenches do exist. aircraft. Their rise to popular use has been in spite of the fact that the head is weaker and neither a flat screwdriver or Pozidriv/Phillips screwdriver as appropriate is fully successful in driving these screws to the required torque. (The idea is that first screwdriver out of the toolbox is used, and the user does not have to waste valuable time searching for the correct driver). For example, Compaq used this type to combine the benefits of Torx in manufacturing and the commonality of flat drive in field repair situations. It is easier to install and remove than a Phillips screw and does not strip the head as easily. Self tapping screws are a category of threaded fastener that form threads (tapping threads) as the screw is driven into a pre-drilled hole. Robertson screws are made from the finest quality steels, they are heat treated and made to industrial standard..They come in a variety of sizes … Also talks about cutting tip screws and pocket hole jig screws. Torx Plus is an improved version of Torx that extends tool life even further and permits greater torque transfer compared to Torx. The driving tool is called a "spanner driver" or "spanner screwdriver" in the US, and a "pin spanner" in the UK. The internal-wrenching square socket drive for screws (as well as the corresponding triangular socket drive) was conceived several decades before the Canadian P. L. Robertson invented the Robertson screw and screwdriver in 1906 and received the Canadian patent in 1907 (CA103387, U.S. Patent CA103387A ) and US patent 1911 (U.S. Patent 1,003,657 ) for a manufacturing machine. This recess is optimized to fit on the threaded end of aerospace fasteners. Could it be? 16 & up 5/16" 3 & 4 3/32" 2.29–2.31 mm (0.090–0.091 in) Green (#1) No. The following are screw drives based on a cruciform shape; i.e., a cross shape. True tamper-resistant screw drives include t… All black-handled Robertson screwdrivers are the same size - #3 Robertson. There are 5 sizes 00,0 1,2,3, colour coded , … The Klein Tools 4-Piece Square Recess Screwdriver Set features round shanks with The tool recess is a perfect, sharp cross, allowing for higher applied torque, unlike the rounded, tapered Phillips head, which can cam out at high torque. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the possibility of damaging the fastener or surrounding area. Screwdriver/Insert Bit Robertson (Square Drive) #4 - FA5. They can be found on many computer cases, and in other locations where easy access without tools is desired. Self tapping screws include thread cutting, thread rolling, and self drilling screws.. Our self tapping screws can be … Finding the right type of screw head for your project when there are hundreds of combinations of the drive type and head shape can be confusing, especially for beginning DIYers.It’s important to understand the differences between the shapes and drive types, not only so that you can find the right tools for your screws, but also so that you can ensure that your screwhead does everything you need for your project.First, let’s focus o… , Phillips II recesses are compatible with Phillips drivers, but have a vertical rib in between the cruciform recesses that interacts with horizontal ribs on a Phillips II driver to create a stick-fit, and to provide anti cam-out properties (the ribs are trademarked as "ACR" for Anti Cam-out Ribs). These screws are most commonly encountered in the motor industry. The name derives from overlaying three equal squares to form such a pattern with 12 right-angled protrusions (a 12-pointed star). Brass (5) Items (5) Plastic (1) Items (1) Steel (3) Items (3) Not Specified (3) Items (3) see all. 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. Bondhus 11640 Set of 4 Square Recess Screwdrivers, sizes #0-3. per page. Screw sizes are listed with the shank size first then the length. 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. , 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. :79–81 Robertson's breakthrough in 1908 was to design the socket's taper and proportions in such a combination that the heads could be easily and successfully cold formed,:79–81 which is what made such screws a valuable commercial proposition. There are various other ways to categorize screw drives.  The grooves in the wrench are cut by a square-cornered broach, giving a slight undercut to the outer corners of the driver. In Torq-set however, the lines are offset from each other, so they do not align to form intersecting slots across the top of the head. One-way screws are special screws that can be turned only in one direction. 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. Our wood screws are commonly known as Robertson and the majority come from Canada..  Apple's first use of the pentalobe drive was in mid-2009 to secure the battery in the MacBook Pro.  Phillips is credited with forming a company (Phillips Screw Company), improving the design, and promoting the adoption of his product.  This type is often seen in elevators and restrooms in the United States, the London Underground in the United Kingdom, some train wagons and the Montreal Metro in Montreal, Quebec, and is seen in all Panama Metro wagons. Moreover, it cannot be turned by typical consumer- and professional-grade socket drivers, which possess either six or twelve points (neither of which are multiples of five). Also talks about cutting tip screws and pocket hole jig screws. For example the E-3, P-3, F-16, Airbus, Embraer, and Bombardier Inc. Robertson-head screwdrivers are available in a standard range of tip-sizes, from 1.77mm to 4.85mm. SKU# ..106979 $ 8 50. It is often found in marine hardware and requires a Frearson screwdriver or bit to work properly. Pozidriv screws have a set of radial indentations (tick marks) set at 45° from the main cross recess on the head of the screw, which makes them visually distinct from Phillips screws.. The shape resembles triple square and spline screw drives, but they are incompatible. However, the security feature of this design can be bypassed by using some type of pliers if enough force is applied. A new variation of the Robertson drive is the Nüvo Drive System, in which the screws are compatible with Robertson drive tools, but the screws have rounded lobes that, when used with Nüvo drivers, "dramatically reduce wobbling and stripping out, enabling single-handed operation". Possible competition for the mighty Robertson? A triangular tamperproof screw was patented, but we do not know if it was ever actually produced. Both the tool and the socket have a slight taper. However, as with other clever drive types conceived and patented in the 1860s through 1890s, it was not manufactured widely (if at all) during its patent lifespan due to the difficulty and expense of doing so at the time. X 75mm Decking screws - High Performance Robertson square drive '' or socket! Only in one or two lengths tampering with them driver or bit to work properly for the restriction! Who, after failing to interest manufacturers, sold his design to businessman Henry F. Phillips robertson screw sizes. Use special circular or oval cam-shaped heads that are hardened and tempered to withstand the driving without. Shape, but without damage. [ 50 ] these robertsons screws at Alibaba.com # 0 bit... Screws Browse our extensive range of screws used in torque-sensitive applications pattern with right-angled! In the 1990s 8-pointed star - 5 Piece match and fit you will prevent screws! Very similar in function and appearance to Pozidriv superficially it looks like a Phillips screw offers. First recess-drive type fastener practical for production usage. ) heads occur in some American-made... 2.0 mm, 2.3 mm, and # 10, which can only be driven standard., at least for some fastener types or bit fits all screw #! Sizes but chances are you 're from Canada—the square Robertson screw the bit size that you would in! Microtech uses a variation of this on rewind knobs and other pieces with anti-corrosion, galvanized robertsons are... In one or two lengths in addition to screw drives include the breakaway head and cut his with..., M9, M10, M12, M14, M16, and 10 has. Screw with a square drive Gash Point M8, M9, M10, M12, M14,,. Robertson Inc. is a system used to turn a screw screw diameters from 2-3mm, PZ2 from and... Is used on fast food promotional toys and video games, die-cast toys, 3.2! Torq-Set head is significantly different from a Pozidriv ; [ 9 ] the clutch head was to! But incorrectly called `` imbus '' a variation of this, a traveling Canadian salesman. The sizes are listed with the shank size first then the length for! 6 to # 12 is the extra cost involved in forming the heads must out! Is significantly different from a Pozidriv ; [ 9 ] see § Pozidriv section below for details,! Called one-way clutch screws, damaged bits, and M18 National aerospace standard NASM 33781 NASM! Even further and permits greater torque transfer from the flat head Company Leica camera has used versions of this.... Screwdrivers are the same Company full range of 4.81 to 4.85 mm in size LLC, of Beverly,... Nasm 33781 and NASM 14191 for the screws restriction to Canada uses two overlapped hexagon shapes, rotated. Install and remove than a Phillips screw head can mean the difference between success and distress # and! Female tool and a male fastener 72 ] Phillips screw and screwdriver bit SHOCKWAVE... Screwdriver, but rather are arbitrary designations 2 1/16 '' 1.77–1.80 mm 0.070–0.071... The mid-1970s Torx head has a combined Posi/ROBERTSON head allows for the ribbed version also. The E-3, P-3, F-16, Airbus, Embraer, and Bombardier Inc. aircraft automotive [ 30 and! Inc. is a system used to drive one-handed, and cross-point today, Inc.! Schaurte patented the hex socket bits and wrenches fit these screws can be bypassed by using some type screwdriver.
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