Stainless steel screws manufacturer Shi Tong Tong takes you to interpret the screw drawings

1. what is called tolerance?

A: Tolerance refers to the difference in the amount of variation that allows for part size and geometric parameters.  Stainless steel screws manufacturer Shi Tong Tong take this drawing as an example to take you to interpret the screw fastener drawings. such as length 31.7 mm, then its length tolerance is 0.2,-0.4, i.e. the length is between 31.3-31.9 mm, then it is line with customer requirements. The thread length is 7 mm, According to the drawing, its tolerance is ±0.2.

2. what is called basic size?

A: The basic size refers to the size given by the designer. such as the drawing provided by  stainless steel screws manufacturer Shi Shi Tong, screw size can be expressed as M1.6×31.7, head diameter 2.92, M1.6 and 31.7 and 2.92 are both basic dimensions.

3. what is the actual size?

Answer: The actual size is the size obtained after the actual measurement. Let’s take an example of the inspection letter from the stainless steel screws manufacturer. The measured dimensions in the inspection specifications are the actual dimensions we have here, the actual scale inch is within tolerance, then the product is qualified, usually we will use micrometer and caliper to measure.

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