STAUFF Safety Locking Plate (Type SIP – Heavy Series)

Description

Operating Principle and Applications

The STAUFF Safety Locking Plate (Type SIP – Heavy Series) is an essential component in hydraulic systems, designed to operate in conjunction with Type AF Stacking Bolts. Its primary function is to prevent accidental loosening of bolts caused by vibrations, impacts or pressure fluctuations, which are common in demanding industrial and mobile applications. Used for the secure fastening of pipework, this plate ensures the structural stability of the hydraulic system in accordance with the most stringent European standards.

Construction Features and Standards

Manufactured in strict accordance with DIN 3015, Part 2, the STAUFF Safety Locking Plate covers a wide range of industrial sizes corresponding to STAUFF Groups 3S to 10S (DIN 1 to 8). Dimensions vary in overall length (L1) from 57 mm for Group 3S up to 317 mm for Group 10S, with structural thicknesses (S) reaching 25 mm for the most demanding ultra-high-pressure applications. The rectangular design with precise geometric interlocks (dimensions L2, B1, B2) ensures perfect accommodation and impeccable mechanical locking of the nut or AF bolt head, minimising the risks of wear and structural fatigue failure.

Materials and Surface Treatments

The technical versatility of the component is greatly enhanced by the wide range of available materials and surface treatments, carefully coded to meet different environmental and fluid requirements. The catalogue options include:

• Code W1: Carbon Steel, uncoated (standard finish for the North American market for size Groups 8S-10S).
• Code W2: Carbon Steel, phosphated (basic standard for most international configurations).
• Code W3: Zinc/Nickel-Plated Carbon Steel (standard for the North American market for Groups 3S-7S), designed for optimised surface corrosion resistance.
• Code W4: V2A Stainless Steel (1.4301/1.4305 – AISI 304/303), highly suitable for humid environments.
• Code W5: V4A Stainless Steel (1.4401/1.4571 – AISI 316/316 Ti), specifically designed for maximum protection against aggressive chemicals, solvents and demanding offshore marine applications.

Additional material variants and surface finishes are available upon specific request from the manufacturer, allowing maximum system customisation according to project parameters.

Dimensions and Technical Specifications

The wide dimensional range described allows adaptation to numerous system configurations and demanding working loads. Looking at the technical details, Group 3S has an L1 length of 57 mm and an L2 dimension of 13 mm, with a net thickness S of 8 mm. Group 4S increases in length to 70 mm while maintaining the same thickness. Intermediate groups such as 6S, with a length of 116 mm and width B1 of 45 mm (and an increased thickness of 10 mm), represent an optimum geometric choice for medium-load systems. Higher-capacity groups, such as 9S (L1 251 mm) and 10S (L1 317 mm, B1 120 mm), are specifically dimensioned to withstand extreme loads and thermal shocks, with S thicknesses of 15 mm and 25 mm respectively. Native design compatibility with AF stacking bolts makes assembly standardised and extremely secure over time.

Summary Technical Table of the Main Features of the STAUFF Safety Locking Plate (Type SIP – Heavy Series)

Product Codes