M7 M12 A193 B7 Zinc Paint Coated 12 Point Flange Head Screw Torx Head Metal Bolt

Engineered for critical service in high-temperature and high-pressure environments, this 12-point flange bolt is manufactured from A193 Grade B7 alloy steel. This material is a chromium-molybdenum steel (typically 4140/4142) that is quenched and tempered to achieve a robust combination of high tensile strength and toughness. The zinc paint coating provides a durable, sacrificial barrier against corrosion, making it suitable for outdoor and industrial atmospheres. The 12-point flange head, combined with a Torx drive, offers exceptional torque transfer and positive engagement, virtually eliminating the risk of cam-out during installation. Available in M7 and M12 sizes, this bolt is a workhorse for demanding industrial applications.

The A193 B7 specification is the industry standard for high-temperature bolting in the petrochemical, power generation, and refining sectors. These bolts are commonly used to fasten flanges in piping systems, pressure vessels, valves, and turbine casings where elevated temperatures and pressures are constant. The zinc paint coating adds a layer of defense against corrosive elements often found in industrial environments. The 12-point flange head is ideal for applications with limited access, as the socket can engage the bolt from multiple positions. The Torx drive feature ensures that mechanics can apply the high torques required for proper gasket compression without damaging the fastener head.

The primary advantage is conformance to the A193 B7 material specification, a globally recognized standard for high-temperature bolting, guaranteeing performance and traceability. The zinc paint coating offers robust corrosion protection, significantly extending the service life of the fastener in harsh outdoor or industrial settings. The dual-drive feature (12-point external and Torx internal) provides ultimate installation flexibility; mechanics can use a standard 12-point socket or a Torx driver depending on tool availability and access. The integral flange ensures proper load distribution, protecting the surface of the flange or component being clamped.