The GB spring washers are basically consistent with the inspection items specified by other national standard spring washers: 1) Dimensional inspection: For the inspection of the outer diameter size, the national standard and the British standard are not specified; for the thickness dimension inspection, since the American standard and the Japanese standard stipulate that the cross section of the spring washer is a thin inner trapezoid, the measurement position is specified in the width. In the middle; for the inspection of the height dimension, the American standard is not specified, and the Japanese standard only specifies a thickness approximately equal to twice. 2) Performance inspection: GB/T 94.1--2008 ((Elastic gasket technical condition spring washer) stipulates "heat treatment hardness for production process reference", that is to say: hardness value is not used as acceptance basis; other national standards The hardness is specified. The American standard does not require the elastic test. The spring washer inspection items in each country are as follows: Elevator Guide Shoe,Guide Shoe For Elevator,Elevator Car Guide Shoes,Elevator Door Guide Shoe MAURER TECHNOLOGIES CO., LTD. , https://www.maurer-elevator.com