Why do long flat head machine screws must confirm these 2 points?

In some cases, when the technicians of the screw manufacturer produce the long flat head machine screws, they always tell the salesman that the screw of this length must be confirmed with the customer when contacting with the customer about the diameter of the screw rod and whether the closing line under the screw head is acceptable to the customer.

It is necessary to confirm the rod diameter and closing line of long flat head machine screws. The reason is that the diameter of the screw rod is directly related to the need for die opening. Believe that a lot of customers will want to do not need to open the mold production screw. One is to save the production cost, and the other is to save production time. Another reason is that the screw rod diameter will affect the freight.

Long length screws in production as long as there is a place of different sizes, the weight of the screw will have a great difference. For example, the long countersunk head machine screw with M5*255 is the same, with the same head diameter and thread diameter of 55mm, but some of the rod diameters are 4.25mm, and some of the rod diameters are 4.8mm. So the approximate difference in their weight is:

The diameter of the rod is 4.25mm, and the weight of 10,000 rods is about 348kg

The diameter of the rod is 4.8mm, and the weight of 10,000 pieces is about 424kg

Their rod diameters differ by the only 0.55mm, but when the number is the same as 10,000, their weights differ by 76kg. When the product is shipped by express, their delivery will be quite different.

The reason why we confirm whether the customer accepts the die closing line is that if we want to remove the die closing line, we need to add a procedure to remove the die closing line. Increasing the process also means increasing the cost of production.

Therefore, when the salesman communicates with the customer, it is necessary to confirm the rod diameter of the long flat head machine screws, as well as whether the customer can accept the closing line.