The Pro-Bolt Cup Alloy Washer slides up the thread of a Parallel Allen Head Bolt and shrouds the head, leaving the head surface exposed. Designed to be used in conjunction with Pro-Bolt Push In Buttons or on their own. Material specification: 7075T73 Anodising: Chemically brightened and colour anodised to between 8 and 12 microns thick Weight: 60% lighter than stainless steel - 40% lighter than titanium. Corrosion: Resistant to saltwater, road film and mild acids. Application: Aluminium is suitable for use in all non-safety critical areas. Aluminium is not suitable for any stress area applications.Sizes are bolt thread diameter by washer height.
