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Comparison Of Performance Requirements For Spring Washers In China, Germany, The United States And Britain

- May 07, 2018 -

Comparison of performance requirements for spring washers in China, Germany, the United States and Britain.


1. China's spring washer performance standard GB/T 94.1


(1) hardness: 42 ~ 50HRC.


(2) elasticity: after the steel spring washer is loaded continuously for three times, the free height should be measured. It should be no less than 1.67 S.


(3) toughness: the steel spring washer is clamped on the bench vice, so that the 90o can not be broken.


2. German spring washer performance standard DIN267 T26


(1) hardness: 430 ~ 530HV.


(2) permanent deformation test: when the steel spring washer is pressed 2min, the free height should be measured, not less than DIN267 T26.


(3) permanent load test: separate 10 spring washers from 10 flat washers and wear them on the test bar. After pressing 48h, the washers must not be broken.


(4) torsion test: the steel spring washer is clamped on the bench vice, and the 90o can not be broken. Continue to load until the broken section, the section should be smooth.


(5) elastic test: when the steel spring washer is pressed 2min, release 20 m, and the remaining elasticity should comply with the regulations in DIN 267 T26.


3. American spring washer performance standard ASME B18.21.1


(1) hardness: 38 ~ 46HRC.


(2) elastic test: after pressing the steel spring washer, the free height should be measured, not less than 2/3 of the original height.


(3) torsion test: the steel spring washer is clamped on the bench vice, and the 90o can not be broken.


4. British spring washer performance standard BS 1802


(1) hardness: 42 ~ 50HRC.


(2) elasticity: loading the steel spring washer to make it completely flatten.  After measuring the height of tea, it should be no less than 1.66S. Then the load is continuously applied and released for 20 times, and its free height should not be further reduced.


In addition, galvanized spring washers should be treated immediately after plating. After plating, the gasket should be placed flat above 48h to see if there is any brittle fracture.


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