It is often found in marine hardware and requires a Frearson screwdriver or bit to work properly. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U. A hex screw drive uses six-sided fastener heads, and the fastener is known as a hex head cap screw. An External Torx version exists, where the screw head has the shape of a Torx screwdriver bit, and a Torx socket is used to drive it. Heads are usually identifiable by a single dot or an “X” to one side of the cross slot. Robertson invented the Robertson screw and screwdriver in and received patents in Canada and U.

Uploader: Gardanris
Date Added: 16 November 2017
File Size: 16.37 Mb
Operating Systems: Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X
Downloads: 45176
Price: Free* [*Free Regsitration Required]

Retrieved 28 February A hex screw drive uses six-sided fastener heads, and the torq set is known as a hex head cap screw. The socket-headed Robertson screws are self-centering, reduce cam outstop a power tool when set, and can be removed if painted over or old and rusty.

The tool recess is a perfect, sharp cross, allowing for higher torq set torque, unlike the rounded, tapered Phillips head, which can cam out at high torque. This type of bolt is commonly used with prison door locks, automobile ignition switchesand street signsto prevent torq set removal.

Torq-Set 1/4″ Hex Insert Bits | Brown Aviation & Aircraft Tools

Phillips Drive System Innovation in Fastener Technology Use this wizard to focus in on the specific high-performance torq set system that best suites your industry and challenges: AmazonGlobal Ship Orders Internationally. Torq set External Torx version exists, where the screw head has the shape of a Torx screwdriver bit, and a Torx socket is used to drive it.

Alexa Actionable Analytics for the Web. True tamper-resistant screw drives include the breakaway head and one-way screw drives. While Pozidriv torq set fit Phillips screws, they may slip or tear out the Phillips screw head. The spline drive was torq set of the obsolete, U.


List of screw drives

The design torq set adopted by some parts of the aerospace industry, led by Lockheed torq set the early s on the Lbut met with mixed results due to complaints of insert damage during installation. Free Shipping by Amazon.

Because the heads must stand out torq set the surface they attach to, they are rarely available in countersunk or flush seg. The most common of these is a combination of a slotted and Phillips headoften used in attaching knobs to furniture drawer fronts. Common in torq set 19th and early 20th centuries, when it was easier and cheaper to manufacture than most other drives, it is less common today although still easy to find because the external hex is now forq and allows better access for wrenching despite nearby obstructions.

Torq-Set® Bits

The following heads are categorized based on commonality, with some of the less-common drives being classified as “tamper-resistant”. Compared to an Allen drive, Bristol drives are less likely to strip for the same amount of torque; however, the Bristol torq set is not much more strip-resistant than a Torx drive. 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.

Phillips drive bits are often designated by the letters “PH”, [10] plus a size code, 00, 0, 1, 2, 3, or 4 in order of torq set size torq set the numerical bit size codes do not necessarily correspond to nominal screw size numbers.

It is designed to be toorq incompatible with many tools. Breakaway fasteners used in a non-security sft 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. The tool has six flat torq set at equal spacing; the sizes are determined by the diameter of torq set star points.


Conversely, while Phillips screwdrivers will loosely fit torq set turn Torq set screws, they will cam out if enough torque sdt torq set, potentially damaging the screw head or screwdriver. When Henry Ford tried out the Robertson screws, he found that they saved considerable time in Model T production, but when Robertson refused to license the screw design, Ford realized that the supply of screws would not be guaranteed and chose to limit their use in production to Ford’s Canadian division.

Torx Plus is an improved version of Torx that extends tool life even further and permits greater torque transfer compared to Torx.

TORQ-SET® Insert Bits – Tools – IRWIN TOOLS

In many countries it is commonly but incorrectly called “i m bus”. Drive todq are about equal thickness. Both the tool and the socket have torq set slight taper.

Linear broaching to cut corners into a drilled hole similar to the action of a mortising machine for woodworking has also torq set used less commonly over the decades. The screw heads are typically flanged, and may fit into standard Allen hex socket torq set screw counterbores molded or machined into parts to be fastened.

They are also known as “game bit screws”, due to their use on some video game consoles. Other informal names include pig nosedrilled head or twin torq set. There has long been a popular belief that this was torq set a deliberate feature of the design, for the purpose of assembling aluminum aircraft without overtightening the fasteners.