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Screws

46 bytes added, 09:41, 21 February 2018
→‎Screw Drives
Visit https://en.wikipedia.org/wiki/Screw#Screw_head_shapes for a comprehensive treatment of this topic.
== Screw Drives <ref>http://www.fastenersuperstore.com/fastener-guides/screws-drive-styles</ref>==
A screw drive is a pattern which is used to turn a screw. It allows torque to be applied to it usually by using a mating tool, such as a screwdriver, that is used to turn it. <br \>
==== Phillips drive ====
Phillips drives are among the most common type of screw drive. They were developed as one of the first alternatives to the slotted drivedrives.
[[File:Phillips2.jpg|frame|center|Image reproduced from [https://commons.wikimedia.org/wiki/File:Screwhead_Anaglyph.jpg here]]]
==== Slotted Drive ====
The slotted drive is , though the oldest drive , is still commonly used today. They are subject to slippage and provide less torque lesser torques than other drives and are subject to slippage.
[[File:Slotted2.png|thumb|center|200px|Image reproduced from [https://commons.wikimedia.org/wiki/File:Screw_Head_-_Slotted.svg here]]]
==== Socket Drive ====
Socket drive screws contain These drives have a hex shaped internal socket which is tightened or loosened using a . A hex key or allen wrenchis used to tighten or loosen it.
[[File:Socket2.png|thumb|center|200px|Image reproduced from [https://commons.wikimedia.org/wiki/File:Screw_Head_-_Hex_Socket.svg here]]]
==== Hex Drive ====
One This one is interesting. It is one of the few drives which is turned by using the outside of the head rather than the inside. Hex head screws are installed with a socket, usually connected to a ratcheting tool or a power driver.
[[File:Hex2.png|thumb|center|200px|Image reproduced from [https://pixabay.com/en/nut-bolt-black-silhouette-hexagon-309717/ here]]]
==== Robertson Drive ====
Square drives These have a square shaped socket which has a slight taper as it goes deeper tapers slightly with depth into the screw head. The Strong torque is provided by the four 90° angles provide strong torque and . They decrease the possibility of slippage.
[[File:Square2.png|thumb|center|200px|Image reproduced from [https://commons.wikimedia.org/wiki/File:Screw_f.svg here]]]
==== U Drive ====
A U drive screw is also Also known as a hammer drive screw. It , it is set in a properly sized pilot hole and . It is then driven into place with a hammer. The Quite interestingly, the threads of the this screw turn as it is driven, thereby creating the fastening action.
[[File:UDrive2.jpg|thumb|center|200px|Image reproduced from [http://maxpixel.freegreatpicture.com/Nail-Fixing-Hammer-Hammering-Metal-157381 here]]]
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