What is a special screw?

For people who are not familiar with the screw industry, they look at the screw and think this is a standard screw. Or if he thinks the screw is used on the product he often USES, he thinks the screw is a standard piece. Actually not necessarily, because screw has standard, also have not standard screw. This depends on how the businessman chooses screw. So what is a special screw?

Standard parts are generally manufactured with reference to standards (such as JIS, DIN, ISO, GB, ANSI), and have standard head sizes, thread sizes, pitch sizes, and groove sizes. And special screw is not in the range of the standard.

For the Shi Shi Tong screw manufacturer,special screw are part of the deformation of the screw is greater than standard screws, there are rarely seen in the market is a part of the screw type, use the standard punch and die have been unable to produce, need to customize mould, punch to produce screws, such as part of this is the head of the screw is in accordance with the standard to production, but the valve stem is not in accordance with the standard size, and so on.

For example, according to the standard number DIN912, M5*20 is produced according to DIN912, the screws produced are standard screws, but if the screw specification is M5*320HM, the head is produced according to DIN912, but the screw rod is not produced according to standard. Screws of this length can generally be referred to as special screw.

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