M4 HoloKrome Socket Head Cap Screws in Black Oxide Class 12+ High Tensile Steel

Holo-Krome branded socket head cap screws, in alloy steel with a strength grade of 12.9, and finished with black oxide. Manufactured in the USA, Holo-Krome are high quality screws, similar to Unbrako, with precision 3A threads for greater clamping force. Designed for critical applications, Holo-Krome screws have a unique Holo-Code stamped in the head, along with the diameter and pitch of the screw, simplifying identification and traceability for users. Socket head cap screws are also known as an Allen screws or Allen bolts. A hex key (otherwise known as an Allen key or hex socket) is required to fit these fasteners. Conforming to ISO 4762 or DIN 912.