Put the head of the screwdriver on the fire to bake it red, and then quickly put it on the screw, wait for about 5 seconds, so that it can be screwed out., on the screwdriver head. See if it meets national standards or customer requirements. Some parameters can be guaranteed by the production process without separate inspection.
The selection of the entire die of the punch should conform to the operating specifications, and the length of the entire fingerprint should be considered when cutting., the most important thing is the difference in the threaded part. Due to the different measurement units,CSK Phillips Head Deck Screws the representation methods of various threads are also different.
Thread rolling is to shape the whole fingerprint. The thermal solution is to increase the angle of the cargo and remove the stress. In the usual domestic sales business, the most frequently encountered standards are GB (National Standard) and DIN (German Standard). Both American and British threads are measured in inches.
Metric thread is based on MM (millimeter), and its cusp angle is 60 degrees. In addition, to indicate American screws, UNC and UNF are usually added after the British screws to distinguish between American coarse threads and American fine threads.
In addition to metric and American threads, there is also a BSW-imperial standard, whose threads are also in inches, commonly known as Wyeth threads. The outer diameter of the fingerprint is adjusted by the interval between the two files. The threads of GB, DIN, JIS, etc
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