Other Screws

Short Description:

PRODUCT NAME.: SCREW
CORLOR: DUE TO ORDER
SIZE: DUE TO ORDER


Product Detail

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Introduction

A screw is a combination of simple machines: it is, an inclined plane wrapped around a central shaft, but the inclined plane (thread) also comes to a sharp edge around the outside, which acts as a wedge as it pushes into the fastened material, and the shaft and helix also form a wedge at the point. Some screw threads are designed to mate with a complementary thread, called a female thread (internal thread), often in the form of a nut object with an internal thread. 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 allows it to be turned 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. A carriage bolt has a domed head that is not designed to be driven. A set screw may have a head the same size or smaller than the outer diameter of the screws thread; a set screw without a head is sometimes called a grub screw. A J-bolt has a J-shaped head that is sunk into concrete to serve as an anchor bolt.

Details

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There are three steps in manufacturing a screw: heading, thread rolling, and coating. Screws are normally made from wire, which is supplied in large coils, or round bar stock for larger screws. The wire or rod is then cut to the proper length for the type of screw being made; this work piece is known as a blank. It is then cold headed, which is a cold working process. Heading produces the head of the screw. The shape of the die in the machine dictates what features are pressed into the screw head; for example a flat head screw uses a flat die. For more complicated shapes two heading processes are required to get all of the features into the screw head. This production method is used because heading has a very high production rate, and produces virtually no waste material. Slotted head screws require an extra step to cut the slot in the head; this is done on a slotting machine. These machines are essentially stripped down milling machines designed to process as many blanks as possible.

The blanks are then polished[citation needed] again prior to threading. The threads are usually produced via thread rolling; however, some are cut. The work piece is then tumble finished with wood and leather media to do final cleaning and polishing.For most screws, a coating, such as electroplating with zinc (galvanizing) or applying black oxide, is applied to prevent corrosion.

Our Service

1.Q: Are you trading company or manufacturer ?
   A: We are manufacturer and specializing in circuit breaker parts and components.

 

2.Q: How long is your delivery time?
   A: Normally 5-10 days if there are goods in stock. Or it will take 15-20 days. For customized    items, the delivery time depends.

 

3.Q: What is your terms of payment ?
   A: 30% T/T in advance ,and the balance before shipment.

 

4.Q : Can you make customized products or packing?
A: Yes.We can offer customized products and packing ways can be made according to customers requirement.

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