Screw and Metal Parts

Short Description:

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


Product Detail

Product Tags

Introduction

A screw is a fastener typically made of metal and characterized by a helical ridge, called a male thread (external thread). Screws  are used to fasten materials by the engagement of the screw thread with a similar female thread (internal thread) in a matching part.

Screws are often self-threading (also known as self-tapping) where the thread cuts into the material when the screw is turned, creating an internal thread that helps pull fastened materials together and prevents pull-out. There are many screws for a variety of materials; materials commonly fastened by screws include wood, sheet metal, and plastic.

Most screws are tightened by clockwise rotation, which is called a right-hand thread. Screws with a left-hand thread are used in exceptional cases, such as where screw will be subject to counterclockwise torque, which would tend to loosen a right-hand screw. For this reason, the left-side pedal of a bicycle has a left-hand thread.

Details

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: Can you offer mould making services?

A: We have made many mould for different customers for years.

 

2.Q: How about the guarantee period?

A: It varies according the different kinds of product. We can negotiate it before place an order.

 

3.Q: How about the scale of your factory?

   A: Our total area is 7200 square meter. We have 150 staffs, 20 sets of punch machines, 50 set of riveting machines, 80 sets of point welding machines and 10 sets of automation equipment.

 

4.Q: What is the cost for the customized mould? Will it be returned?

   A: The cost varies according to the products. And I can be returned depends on agreed terms.

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