DIN 127 A, Technical Specification And Weight Count Chart Of Spring Lock washers Type B - Plain Pattern Din 127.Table according to DIN 127: dimensions in mm. Size, For thread, d1 min. d1 max. d2 max. b, s, h min. h max. k, r, Weight kg /1000pcs. 3, M3, 3,1, 3,4, 6,2, 1,3 ± 0,1 . https://rsgfasteners.com/din-127b.html