Black oxide countersunk hex socket bolt

Black oxide countersunk hex socket bolt is widely used in industrial assembly scenarios where flush mounting is required. The conical head design enables the fastener to sink into the workpiece surface to maintain flat appearance. Ningbo Gangtong Zheli Fasteners Co., Ltd. controls the whole production process from raw material inspection to finished product testing, ensuring stable mechanical performance of each batch of fasteners.

Product Performance Advantage

Manufactured with medium carbon alloy steel, the raw material meets international common industrial fastener standards. Strict tempering and quenching heat treatment improve tensile strength and fatigue resistance of the workpiece. Black oxide countersunk hex socket bolt receives black oxide finishing to offer mild anti-rust property for indoor working environments. Ningbo Gangtong Zheli Fasteners Co., Ltd. implements full-size sampling inspection before delivery to reduce defective rate.

Application Scope & Custom Support

This series of fasteners fits machinery equipment, precision molds and automation equipment assembly. Standard specifications maintain continuous stock supply. Buyers can choose multiple surface treatments including black oxide, zinc plating and stainless steel polishing according to service conditions. Custom dimensions are available to match non-standard assembly demands. Black oxide countersunk hex socket bolt can be matched with corresponding washers and nuts to complete fastening solutions.