ITEM NAME:Diameter M10x1.5mm 304 Stainless Steel Serrated Hex Flange Nuts 12pcs G4Y7 Diameter M10x1.5mm 304 Stainless Steel Serrated Hex Flange Nuts 12pcs G4Y7 A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer. These nuts have serrations on the integrated washer giving it a "locking" characteristic. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface. Product Name: Hexagon Flange Nut; Fastener Type: Hex Threaded Flange Nut; Thread Diameter: M10 Screw diameter * Spacing M10 * 1.5mm Hexagon nut Outside diameter: 13.8mm Flange face diameter: 18.4mm Material: 304 stainless steel; color: silver Net weight: 125g; Package Contents: 12 x hex flange nut Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer. Fastener Type: Hex Threaded Flange Nut;. Material: 304 stainless steel;. These nuts have serrations on the integrated washer giving it a "locking" characteristic.