A flange washer is a special type of washer with a wide outer diameter designed to distribute load more evenly across a bolted connection. They are commonly used when you need one or all of the following: even load distribution on soft materials or gasket surfaces, protection against nuts and bolts, improved sealing performance, vibration damping, and corrosion protection.

The right material depends on the environment, load, and temperature. Stainless steel is best for corrosion protection and is widely used in marine, chemical, and outdoor environments. Carbon steel is strong and economical, suitable for indoor industrial use or non-corrosive environments. High-temperature alloys such as Inconel are used for extreme temperatures or critical flange conditions.

Yes. When used correctly, flange washers can improve sealing performance by distributing bolt load evenly across the gasket, reducing the chance of uneven compression. They also limit vibration-related loosening that can lead to leaks over time.

Not always, but they are recommended for softer gasket surfaces or materials. Certain industries commonly require washers for safety and sealing reliability. Heavy hex bolts often perform better with washers to avoid nut and bolt embedment.

Choose your flange washer based on bolt diameter, outer diameter, and thickness. The washer must slide easily onto the bolt without excessive play. The outer diameter should be large enough to distribute the load effectively. For heavy loads, high pressure, or high torque, choose a thicker, hardened washer.