Bulte Plastics has a range of hex-head screws, in sizes M5, M6, M8, M10
and M12 and lengths from 6 to 130mm, with the washer moulded into the
fastener. The standard material is polyamide, though other materials are
available on request for medical and food industry applications,
including PP, PE and POM. The standard colour is natural, but Bulte says
it can provide these fasteners in a wide range of colours.