screw

A screw is a type of fastener, sometimes similar to a bolt (see Differentiation between bolt and screw below), typically made of metal, and characterized by a helical ridge, known as a male thread (external thread) or just thread. A screw is an inclined plane wrapped around a nail. Some screw threads are designed to mate with a complementary thread, known as a female thread (internal thread), often in the form of a nut or an object that has the internal thread formed into it. Other screw threads are designed to cut a helical groove in a softer material as the screw is inserted. The most common uses of screws are to hold objects together and to position objects.
A screw will usually have a head on one end that contains a specially formed shape that allows it to be turned, or driven, with a tool. Common tools for driving screws include screwdrivers and wrenches. The head is usually larger than the body of the screw, which keeps the screw from being driven deeper than the length of the screw and to provide a bearing surface. There are exceptions; for instance, carriage bolts have a domed head that is not designed to be driven; set screws often have a head smaller than the outer diameter of the screw; J-bolts have a J-shaped head which is not designed to be driven, but rather is usually sunk into concrete allowing it to be used as an anchor bolt. The cylindrical portion of the screw from the underside of the head to the tip is known as the shank; it may be fully threaded or partially threaded. The distance between each thread is called the "pitch".
The majority of screws are tightened by clockwise rotation, which is termed a right-hand thread; a common mnemonic device for remembering this when working with screws or bolts is "righty-tighty, lefty-loosey." Another rule is this: curl the fingers of your right hand around the screw with your thumb pointing is the direction you want the screw to go. If the screw is right-handed (most screws are) and you turn the screw in the direction of your fingers the screw will move in the direction of your thumb. Screws with left-hand threads are used in exceptional cases. For example, when the screw will be subject to counterclockwise torque (which would work to undo a right-hand thread), a left-hand-threaded screw would be an appropriate choice. The left side pedal of a bicycle has a left-hand thread.
More generally, screw may mean any helical device, such as a clamp, a micrometer, a ship's propeller or an Archimedes' screw water pump.

View More On Wikipedia.org
  1. LeeDicko

    Question ebay purchase issue...

    Hope this is the correct forum to post this on! I recently bought an Xbox Series S on eBay. When it arrived, the back of the console had a sticker covering where the screws are located stating 'Console Doctor'. A quick Google of this and it seems like it's a console repair website. The seller...
  2. D

    Question Screw size for Panasonic 50GT60 stand?

    I recently purchased a new TV to replace my lovely Panasonic 50GT60. It was mounted on my wall, but I saved the original stand. I taped the screws on the stand, but unfortunatley after a couple housecleaning jobs which included moving a lot of stuff around, the screws got lost. I don;t wanna...
  3. M

    Fixings to Plywood Wall

    Hi All, TV received, which I’m going to mount to the wall. The wall is a plywood wall about 12mm thick. I’ve got an additional piece of ply 16“ x 32“ which I’m going to screw to the Existing wall and also use No More Nails Adhesive. The supplied bolts to attach the TV mount to the wall are for...
  4. A

    LG C3 42" vesa screw size (length)

    I have just brought hoke my LG C3 42" and upgrade from my Samsung. I have a small TV stand so the legs are too far apart. Same issue I had with my Samsung. I was just going to remove the universal central stand from the old TV to the new one. First problem, vesa screws are too wide. A quick...
  5. E

    Will an Update Screw Up My Customisations and Channel List?

    My TV is offering to perform a software update. I've spent endless hours getting my sound, picture and other settings to the way I want them and tuning in satellite and terrestrial channels as well as ordering them. I've seen posts about people losing their settings, so is there any setting for...
  6. L

    How do you disassemble the SOC1000ma ? There was only one screw on the back of it I took it out and I still need to get the back off of it? Thanks

    How do you disassemble the SOC 1000ma ? There was only one screw on the back of it I took it out and I still not can’t get it apart , I have audio on my television but no video I bought a new cable to go to the audio video connection but it feels like it’s weird into the one box I want to take...
  7. R

    Tv screen

    Hello I'm new to here and after some advice from group my lg 70 tv not that old keeps showing green dots all across screen tried all cables and connections all ok and after some help
  8. JamieNewbie

    What's the correct mounting screw for Samsung UE40KU6020

    Hi all, Looking for some help this sunny Friday if you please. I have a 2016 Samsung UE40KU6020. 200 x 200 Vesa. Does anyone know the correct TV bracket mounting screws for this TV? My research suggest it might be a 20mm "M6" but I'm struggling to confirm it's definietly an M6 and not an M8...
  9. BigBee

    77" C2 wallmount screw size

    Hi. I currently have a 65" E7 wallmounted and am looking to replace it shortly with a 77" C2. Both the E7 and C2 are VESA 300x200, my question is does anyone know what the screw size is on the C2 for wallmounting? Would also be really helpful if anyone knows if the screw size is the same as the...
  10. G

    LG G2 77” VESA screw size

    Hi I’m hoping someone can help as I can’t find the answer online! I’ve purchased an LG G2 77” today and am trying to get ready for when it’s delivered next week. I won’t be using the supplied wall mount and am hoping I can use my existing mount (used for a 75” Samsung QN900A which is being...
  11. Steve N

    Coloured Screw Caps for number plates.

    I've just picked up my new car :) However, the number plate screws are just steel without plastic caps. I can see these are easy to buy and fit, But . . . . Can you get them where half the cap is black and the other half is yellow or white? Most of my screws seem to be right on the edge of the...
  12. mjeshurun

    Dyson V11 Absolute screw sizes

    Hi Friends, I own a Dyson V11 Absolute cordless vacuum cleaner. Lately, I've been having issues with the trigger button, which makes me suspect the trigger lever might be cracked. Does anyone know what torx screw drivers sizes will fit the V11? I don't currently own any torx screw drivers so I...
  13. marvi0

    Ps5 ssd screw striped and stuck!

    Hi guys. Tried to do my ssd upgrade today, and now faced with the dreaded striped screw. The first screw came off fine, but the one inside, is stuck and it won't budge. Checked online and this appears to be a common issue. What should I do. Should I just leave the stuck screw and buy something...
  14. A

    LG OLED C2 55” wall mount screw size

    I bought a LG OLED C2 55” and was wondering which screw size do I need to wall mount it? I know that it is a M6 but I don’t know the length. I have bought a Vogels THIN 405 wall mount and I think they come with M6-12 and M6-25 mm screws. I’m afraid that the 25 mm will damage the panel?
  15. Buhaj

    65 inch OLED screw holes measurement

    Can anyone tell me what is the distance between the lower edge of a 65" Sony OLED (A80J) and the lower screw holes? I am trying to see how I should plan a cable channel in the wall. Also, would I need to readjust a wall mount while switching to a different size TV of the same family if I want to...
  16. 8

    LG OLED65C16LA longest VESA screw length

    Can anyone who has wall mounted their LG OLED65C16LA advise what is the longest m6 screw l can use in the vesa mounting holes in the back of the tv please?
  17. skirpydoink

    hisense H65B7500UK screw size for stand?

    Hi just moved into a new house and cant hang the TV up on the wall yet. I have a hisense H65B7500UK and was going to put it on its stand but have lost the screws, anybody happen to know the screw sizes that would fit this stand? Thanks for any help 🤞
  18. chaz

    Screw Type Record Clamp ?

    I have one of the original Pro-Ject Xperience Turntables ( Not the Type II ) the thing is on mine it has a screw type Spindle I would like to know beside the one I have is there other record clampI can use beside the one I have already got as I would like a nicer looking one as I am buying a...
  19. V

    LG OLED C1 77" wall mount screw size?

    Which screws do I require for the C1 77" to wall mount? I understand the TV requires M6 screws, but which depth?
  20. D

    Support Foot attachment screw size ?

    Son and family have gone overseas, so we've inherited their LG 50UH635V. They had it wall-mounted, which we don't want - they gave us the support feet for it, but they've lost the attachment screws. I'm guessing that those are probably common to many of the larger LG TVs - can anyone confirm...
Back
Top Bottom