Fasteners need to be:

	Strong enough for the job that they have to do. Depending on the fixing requirements, fasteners generally work by clamping items together and by resisting sheer (sideways) loads.
	Correctly sized, including the right length, diameter and thread design.
	Compatible with all the materials that they come into contact with.
	Properly fitted, including preparation for positioning the fastening, and correctly tensioned.
	Non-corrosive so as not to cause failure or detract from the good looks.
	Well made without rough edges - if you can see them they need to be smooth, look good, and, if coloured, matched to the surrounds.
	Industry standard sizes so you can get an exact replacement if needed.
	If they are manufactured to WANZ Standards, they will carry the WANZ Component Supplier Mark and be guaranteed by the component supplier.

Specifications