sell screw- Screws and Bolts-high quality screw

We sell screw, please feel free to contact us via sales@aicoer.com.cn

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we sell screw and export screw
Chipboard Screws, Double Countersunk/pozi Head, Full or Partial thread, C1018 or C1012 + Harden Finish: ZP, ZY

Screws and Bolts

A screw used as a threaded fastener consists of a cylindrical shaft, which in many cases tapers to a point at one end, and with a helical ridge or thread formed on it, and a head at the other end which can be rotated by some means. The thread is essentially an inclined plane wrapped around the shaft. The thread mates with a complementary helix in the material. The material may be manufactured with the mating helix using a tap, or the screw may create it when first driven in (a self-tapping screw). The head is specially shaped to allow a screwdriver or wrench (British English: spanner) to rotate the screw, driving it in or releasing it. The head is of larger diameter than the body of the screw and has no thread so that the screw can not be driven deeper than the length of the shaft, and to provide compression.

screws can normally be removed and reinserted without reducing their effectiveness. They have greater holding power than nails and permit disassembly and reuse.

The vast majority of screws are tightened by clockwise rotation; we speak of a right-hand thread. screws with left-hand threads are used in exceptional cases, when the screw is subject to anticlockwise forces that might undo a right-hand thread. Left-hand screws are used on rotating items such as the left-hand grinding wheel on a bench grinder or the left hand pedal on a bicycle (both looking towards the equipment) or hub nuts on the left side of some automobiles.

If you are interested in our screw, please feel free to contact us. Believe that we can offer you the best screw and price.