Robertsonâs design consists of a tapered square-tipped screwdriver that fits When asked why he charged a premium even though they were cheaper to make, Robertson had a simple answer: They're better.
It offered a big advantage over the slotted screw head because it was self-centering and not prone to slipping when driven. Daily Headlines. RE: Robertson vs Philips screws ttech (Vendor) 16 Dec 04 08:40. is inserted into the screw head recess, it will quickly seat itself as
unlikely to slide out of the screw due to centrifugal force. Conversely, while Phillips screwdrivers will loosely fit and turn Pozidriv screws, they will cam out if enough torque is applied, potentially damaging the screw head or screwdriver.In detail, the Supadriv screwhead is similar to Pozidriv but has only two identification ticks, and the secondary blades are larger. Slotted/Phillips (as opposed to slotted/pozidriv) heads occur in some North American-made switchgear.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.A combined slotted and Torx drive screw was used in electronics manufacturing. Public domain image by Matt Deres. time.The Phillips driver was purposely designed to cam-out or slip out of the The most common sizes in use for consumer electronics are DCT-20 and DTC-27. Henry Ford, after finding that the screw saved him about 2 hours of work for each car, attempted to get an exclusive licence for the use and manufacture of the Robertson screw in the US. Hex socket screws require an Allen wrench, while hex screws are entirely hexagonal without an indent for a tool, meaning it needs a wrench or socket wrench. fundytides: 01-01-2015 06:30 PM: Re: Robertson vs Phillips Screws? It offered a big advantage over the slotted screw head because it was self-centering and not prone to slipping when driven. early 1900's to overcome drawbacks associated with the slotted screwdriver. widely licensed Phillips head has gained greater acceptance worldwide, including
For Samuel, Septimus and Robert, publishers and printers of South Australia, see Some specialty #6 Robertson screws require a Red #2 driver.Camcar eventually became part of Textron Fastening Systems in the 1990s. than a Robertson head screw because the Robertson screw provides more depth for Share on Facebook. This design makes a Robertson screwdriver less susceptible to cam-out than a Phillips driver because the driver bit inserts deeper into the screw head. because the driver bit inserts deeper into the screw head. Hex socket screws require an Allen wrench, while hex screws are entirely hexagonal without an indent for a tool, meaning it needs a wrench or socket wrench. sometimes get stuck in the screw head.It is more difficult to remove a painted-over or rusted Philips head screw
For example, machine screw threads are finer and partnered with a nut or tapped hole, while wood screws have a deeper thread. Ford Canada started using Robertson screws in Model T days. The knife and gun manufacturer Microtech uses a variation of this with 3 round holes arranged in a triangle shape. Sheet metal screws also have coarse threads like wood screws but tend to be shorter.
His invention? A discussion of screw characteristics and preferences, with some interesting history and background.
The LOX-Recess screw drive was invented by Brad Wagner, and fasteners using it are distributed by licencees Hitachi, Dietrick Metal Framing, and Grabber.Sizes are M4, M5, M6, M8, M9, M10, M12, M14, M16, and M18. Robertson's refusal to license his technology to other manufacturers. Like a Phillips screwdriver, the Robertson driver is self-centering.
other compact head screws. They can be tightened with a flat head but need a special tool to remove them.Phillips heads have a cross-shaped tool indent. Just spray a little aerosol contact cement in the end of your bit holder, stick your bit in the glue that is in the holder then pull it back out for a few seconds, let it dry a little then force it back in.
That is why Phillips spread around the world and Robertson is only the primary screw in Canada. In practice, drivers for the fasteners may or may not interchange, but should be examined carefully for proper fit before application of force. Sizes 0-4 are most commonly encountered.Robertson screwdrivers are available in five different tip sizes, with Phillips drive bits are often designated by the letters "PH",A Phillips screw head is significantly different from a PoziDriv;The design is often criticized for its tendency to Pozidriv screwdrivers are often designated using the letters "PZ" followed by a size code of 0, 1, 2, 3, 4 or 5 (in order of increasing size).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.While a Phillips screwdriver has slightly tapered flanks, a pointed tip, and rounded corners, a Pozidriv screwdriver has parallel flanks, a blunt tip, and additional smaller ribs at 45° to the main slots. Key-Rex screws are another design, and are used in such things as ballot boxes and bank vaults.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. difficult to limit torque in early power screw drivers).A Phillips driver is self-centering and is
The first is the material used to make the screw and the second is the material used to finish it and give it a specific appearance. Many will think of an inch-long piece of metal with spiral threads and a Phillips or slotted head.