Ốc vít tự hàn bằng thép không gỉ Chiều ngang với lớp phủ DIN 967

DIN 967 Stainless Steel SS 304 Cross recessed Pan Head Screws With Collar Self Tapping Metal Screws​
 

1. Description:
 
Cross recessed Pan Head Screws With Collar. 

From the outset Phillips pan head screws screw screws strand ordered into production industry manufacturers, certainly first detected screw wire diameter sizes, materials and testing screws, screw diameter is generally used calipers to measure the diameter size, whether self-closing ordered the same size. After these good detection is detected in the production process, the head of the screw from the fight started, determine the size of the head, head-to-edge, diagonal, cross groove depth, screw tolerance and so on. These are used to detect the caliper. All aspects of the testing while rubbing the teeth is the main thread that can pass only through regulation, regulation screw thread can not pass through, stopping only regulation. In the second plating is the measurement problem. Well after plating, it is not in line with environmental requirements, can not be too time required for salt spray. Tools environmental testing machine, salt spray test machine.

In short, cross recess Screws production and marketing process, the use of quality tools necessary to detect screw certainly have, and now you want to summarize summarized as follows: calipers, hardness tester, salt spray machine, environmental testing machine, and so on through regulation ended Wait.

What is the cross, it is the head of the screw is cross-shaped, the cross is a cross with a fine blanking, stamping made. For the material, phillips pan head screws are made of iron which is into carbon steel, stainless steel is also divided. There are three types of carbon steel, low carbon steel, middle carbon steel, high carbon steel. Stainless steel also has different type: stainless steel SUS201 stainless steel SUS304, stainless steel SUS316, stainless steel SUS404 and the like.

Usually it fingertips head, coarse teeth, hard wood screws, there are aluminum, plastics. A special self-tapping screws for metal threaded hole opening is called tapping.

Cross recessed pan head self-tapping screws are used for non-metal or soft metal, do not hit the hole and tapping low; self-tapping screws are pointed, so as to "self-tapping"; Ordinary screw heads are flat. The self-tapping screws is to drill hole without tap holes. The screws are different with general screws.

2. Specification