Non-standard bolt analysis fastener tolerance

Non-standard bolt analysis fastener tolerance

According to the analysis of non-standard bolt related technical personnel, in order to make the parts interchangeable, the dimensions of the parts are required to be within a reasonable range, and thus the limit dimensions are stipulated. The actual size after manufacture should be within the specified maximum limit size and minimum limit size range. The amount of allowable size variation is called dimensional tolerance, or tolerance for short.

Standard tolerance: The value of standard tolerance IT is basically any tolerance listed in the standard to confirm the size of the tolerance zone. The standard tolerance is divided into 20 levels, namely: IT01, IT02, IT1 to IT18. IT stands for standard tolerance, and the number stands for tolerance level. IT01 has the smallest tolerance value and the highest precision; IT18 has the largest tolerance value and the lowest precision. (Guide: Tips on the use of screws and nuts)

Basic size: Design the given size.

Limit size: The two limit values u200bu200bof allowable size changes, which are determined based on the basic size.

Deviation: The algebraic difference of a certain actual size minus its basic size.

Limit deviation: Refers to the upper deviation and the lower deviation. The algebraic difference obtained by subtracting the basic size from the maximum limit size is the upper deviation; the algebraic difference obtained by subtracting the basic size from the minimum limit size is the lower deviation.

Dimension tolerance: allowable size variation. That is, the difference between the maximum limit size and the minimum limit size; it is also equal to the absolute value of the algebraic difference between the upper deviation and the lower deviation.

More related metal stamping processing industry news: