This great assembly is perfect for application of asphalt panel roof systems,
particulary in corrosive environments and seaside installations.
304 Stainless steel is also recommended for longest life from galvanized
sheet metal roofing and siding. Standard washer dimensions- 9/16 O.D. by 1/8 thick.
Annular ring threads and large resilient EPDM washers combine to provide permanent
weathertight fastening.
stainless-fasteners.co.uk