12.9 Black Oxide Coated Steel HoloKrome

Holo-Krome is a brand of high precision threaded fasteners manufactured in the USA, and are available with metric and UNC & UNF threads conforming to the relevant ISO and ASME/ANSI standards. These high tensile strength fasteners are made from alloy steel and finished with black oxide. Their class 3A threads offer greater clamping force, and the tightly controlled fillets beneath their heads increase their fatigue strength. Holo-Krome fasteners are very similar to the Unbrako brand of fasteners, and are suitable where close tolerances, safety and strength are required. Holo-Krome socket head cap screws are marked with a unique Holo-Code on the head, along with the diameter and pitch of the screw, simplifying identification and traceability for users.