... :2008 certificate 5 years expreience in exporting Product: internal serrated washer 1. size: all sizes 2. material: carbon steel 3. standard ... for bearing and shaft, parallel pin (parallel key) , wave spring washer, E-ring (retaining ring), circlips, disc spring, wooduff key and ... meets Germany standard especially DIN471, DIN472, DIN983, DIN 988, DIN984, DIN2093, DIN5417,DIN6799, DIN6885, DIN6888.