This is a Dormer standard HSS countersink from their general-purpose cutting tools series, designed for creating conical seating surfaces in pre-drilled holes for countersunk fasteners. The 90° angle matches standard countersunk screw heads. Critical verification: confirm the 8.3mm head diameter matches your fastener specifications, as countersink sizing is application-critical.
This document confirms the above specification is available in
the ACG Industrial catalogue. Pricing and availability on request.
Forward to your procurement team to initiate an RFQ.