Mild Steel Zinc Flake

It depends on the joint. If the connection is blind and the fastener can only loosen in one direction, a single Wedge Washer is required. For a through-bolted joint where loosening could occur from either side, two Wedge Washers are required, one under the bolt head and one under the nut.

There is no single torque value suitable for every application. Material strength, friction, clamping length, and embedment all influence the final result. Because friction plays a major role in torque accuracy and clamp load consistency, lubrication is recommended where possible. Tightening torque and clamp load guidelines for Grade 5, 8, and 9 fasteners are provided in the Wedge Washer® brochure. Each critical bolted joint should be analyzed individually by a design engineer.

Wedge Washers are supplied as a pre-glued pair for correct first installation. The adhesive ensures correct orientation and has no technical function once installed. If removed, the washers separate into two pieces and must be reinstalled correctly, with the cam faces together and the serrated faces facing outward.

Tighten the joint to the specified torque, then mark a vertical line across the bolt head or nut, both washer halves, and the mating surface. Untighten the joint. If functioning correctly, the line on the mating surface remains aligned with the contacting washer half, while the line on the bolt head or nut separates. This confirms serration engagement and cam function.

Mild Steel Zinc Flake Wedge Washers are suitable for use with bolt grades up to Grade 9. They are used in general industrial applications where common grades of bolts such as 5, 8 and 9 are being used to make connections.

Complete dimension tables, tightening torque and clamp load guidelines for Grade 5, 8 and 9 fasteners, Junker Test performance data to DIN 25201, and installation guidance are all available in the Wedge Washer® catalog. Download the Wedge Washer® Catalog (PDF), or contact our engineering team for application-specific support.