Stainless Steel Grade – UNS S31254

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. When using stainless materials we always recommend using a lubricant to avoid thread galling. Tightening torque and clamp load guidelines for grades A2 and A4 fasteners are provided in the Wedge Washer® brochure. Each critical bolted joint should be analyzed individually by a design engineer.

254 SMO is the common name for UNS S31254 / 1.4547. It is used where extreme corrosion resistance is needed, especially in chloride-rich environments like seawater. With a pitting resistance equivalent number of PREN 45, it offers significantly higher pitting resistance than Grade 316L (PREN 27), making it suitable for marine equipment, desalination plants, offshore platforms, and chemical processing involving aggressive acids.

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.

Complete dimension tables, tightening torque and clamp load guidelines for grades A2 and A4 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.