STAUFF Safety Lock Washer (Type SI DIN 463 – Heavy Series)

Description

Operating Principle and Application

The STAUFF Safety Lock Washer (Type SI DIN 463 – Heavy Series) is a fundamental component in the hydraulic components and fluid contamination control sectors. Its primary technical function is to act as a locking device that prevents the accidental or vibration-induced loosening of hexagon head bolts, specifically those identified as Type AS. Installing this safety lock washer requires a precise mechanical action to ensure effective locking: the installer must bend the longer tab downwards towards the side of the clamp body, while the shorter tab must be bent upwards so that it rests against one of the flat faces of the hexagon bolt head. This two-tab system, compliant with DIN 463, creates a secure physical lock that maintains the tightening torque over time.

Construction Features and Standards

Designed for the most demanding applications, this washer belongs to the Heavy Series and is manufactured in strict compliance with DIN 3015, Part 2. Its geometric design is distinguished by two safety tabs, identifying it as Type SI in accordance with DIN 463. The product range covers a wide variety of sizes and is suitable for STAUFF Groups 3S to 12S, corresponding to DIN Groups 1 to 10. The precise inside diameters, indicated as ØD1, range from 10.5 mm for the smallest groups up to 31 mm for the largest clamp groups, ensuring precise compatibility with the respective Type AS bolts.

Material Specifications

To meet different environmental and mechanical resistance requirements, the STAUFF Safety Lock Washer (Type SI DIN 463 – Heavy Series) is supplied in two premium standard material versions. The first is identified by material code W3, indicating carbon steel with a zinc/nickel-plated surface treatment, ideal for preventing oxidation in conventional industrial applications. The second is identified by material code W5 and is manufactured from V4A stainless steel. Specifically, W5 corresponds to grades 1.4401 or 1.4571, equivalent to AISI 316 or AISI 316 Ti, providing superior corrosion resistance in aggressive environments. STAUFF also offers maximum flexibility, with alternative materials and different surface finishes available upon request for projects with specific requirements.

Summary Technical Table of the Main Features of the STAUFF Safety Lock Washer (Type SI DIN 463 – Heavy Series)

Product Codes