Hexagon nut with collar DIN Burnished steel class 10

Hex nuts DIN 6331 are used on clamping applications which require frequent clamping and unclamping (m = 1,5 x d1). The collar of the nut eliminates the need for washers. The official standard sheet specifies the additional sizes M 27, M 42 and M 48. But M14 ist not forseen on the official standard sheet.