200x Qualfast M4X50 Skt Button Head Screw BZP (GR-10.9)
High Grade Alloy Steel to BS EN ISO 898/1 Grade 10.9. For high tensile applications. Maximum operating temperature (unplated): 300C. For materials that are too thin to countersink. Low head profile for a smooth finished appearance. Also suitable for non-critical loading requiring heat treated fasteners.