STAUFF Hexagon Head Bolt (Type AS – Twin Series)

Description

Operating Principle and Fastening Architecture

The STAUFF Hexagon Head Bolt (Type AS – Twin Series) is the structural fastening and preload component used in support systems for rigid pipes and hoses manufactured in accordance with DIN 3015, Part 3 (Twin Series). Its operating principle is based on the application of a calibrated tightening torque that ensures the correct compression of the clamp bodies around the hydraulic line, with the bolt positioned directly between the upper cover plate (Type GD) and the weld plate or lower supporting structure.

The integration of the Type AS bolt within the clamp assembly ensures the effective absorption of high-frequency vibrations, dynamic loads and pressure surges generated by high-pressure fluid flowing through industrial and mobile pipework, preventing accidental loosening or structural failure of the lines.

Construction Features, Materials and Surface Finishes

Manufactured in strict compliance with the international DIN 931, DIN 933 or ANSI/ASME B18.2.1 standards, the STAUFF Type AS Hexagon Head Bolt is engineered to provide maximum mechanical reliability under high static and dynamic loads. The component is available with two different thread types: standard ISO metric threads or Unified Coarse (UNC) threads, covering a wide range of design requirements in European and North American markets.

Depending on the severity of the installation environment and the required level of corrosion resistance, Type AS bolts are available in three material and surface-treatment configurations:

• Material Code W3: Zinc/nickel-plated carbon steel, ideal for standard indoor industrial applications or moderately aggressive environments.
• Material Code W4: V2A stainless steel (AISI 304 / AISI 303 – 1.4301 / 1.4305), suitable for outdoor environments or the food and process industries where a high level of protection against oxidation is required.
• Material Code W5: V4A stainless steel (AISI 316 / AISI 316 Ti – 1.4401 / 1.4571), specifically developed for marine, shipbuilding, offshore and chemical applications, providing maximum resistance to chemical agents and saline environments.

Industrial Applications and Fields of Use

Type AS fastening components for the STAUFF Twin Series, covering Groups 1D to 5D, are used across the most demanding sectors of mechanical engineering and fluid power systems. Main applications include:

• High- and ultra-high-pressure hydraulic systems in manufacturing and heavy industry.
• Construction machinery, agricultural machinery and industrial vehicles in mobile applications.
• Marine, shipbuilding and offshore applications using the W5 stainless steel version.
• Lubrication systems, hydraulic power units, filtration systems and fluid contamination control systems.
• Chemical, petrochemical and service-fluid processing systems.

Fluid Specifications and Environmental Compatibility

Although the bolt is an external mechanical fastening element and does not come into direct contact with the fluid inside the pipework, its integrity is essential for supporting lines carrying mineral hydraulic oils, synthetic fluids, water-oil emulsions, fuels or aggressive process fluids. Selecting the correct material code (W3, W4 or W5) helps prevent galvanic or contact corrosion and ensures maximum durability even in the presence of chemical vapours, salt spray, constant humidity or extreme temperature fluctuations.

Summary Technical Table of the Main Features of the STAUFF Hexagon Head Bolt (Type AS – Twin Series)

Product Codes