STAUFF Channel Rail Adaptor (Type CRA – Twin Series)

Description

Operating Principle and Application

The STAUFF Channel Rail Adaptor (Type CRA – Twin Series) is engineered to enable the secure, stable and highly reliable mounting of Twin Series pipe clamps, in strict accordance with the requirements of DIN 3015, Part 3. Developed for direct integration with various types of industrial Channel Rails, this mechanical component eliminates the need for welding or drilling on supporting structures. This ensures quick installation and allows easy adjustment or longitudinal repositioning of the pipe axis. It is important to note that the CRA-1-8/1D size variant extends its technical flexibility by also being certified for use with the Standard Series, fully covering STAUFF Groups 1 to 8.

Construction Features and Material Specifications

Designed to withstand demanding mechanical and environmental stresses, the adaptor is available in two main high-quality material variants (Material Code). The first option, identified by code W3, uses carbon steel treated with a special zinc/nickel-plated finish that provides an excellent protective barrier against corrosion in standard operating environments. For applications in chemically aggressive or marine environments, the W5 version is manufactured from V4A stainless steel, specifically grades 1.4401 and 1.4571 (equivalent to AISI 316 and 316 Ti specifications). The internal fastening system can be configured according to system requirements by choosing between ISO Metric thread (code M) or Unified Coarse Thread UNC (code U).

Dimensional Groups and Threads

The technical range systematically covers the various dimensional groups required by the hydraulic industry. The sizes are divided into three main interface categories: STAUFF Group 1D (corresponding to DIN Group 1), STAUFF Groups 2D to 3D (DIN Groups 2 to 3) and STAUFF Groups 4D to 5D (DIN Groups 4 to 5). Depending on the selected dimensional group, the available metric threads are M6 and M8, while the UNC variants include 1/4-20 UNC and 5/16-18 UNC. The construction tolerances and specific dimensions (such as spacer height H3, ranging from 20.5 mm to 23.5 mm) ensure exact positioning and correct preload of the clamp on the pipe.

Compatibility with Channel Rails

A key technical advantage of the STAUFF Channel Rail Adaptor (Type CRA – Twin Series) is its verified compatibility with a wide selection of standardised profiles available on the global market. Supported rails include the HALFEN series (models HM 41/41, HZA 41/22, HZM 41/41, HZM 41/22, HL 41/41, HL 41/B2), the HILTI family (from MQ-21 to MQ-72 including U and D variants), the extensive UNISTRUT range (P1000, P2000, P3003, P4000, P5000 and P5500 series, including T, V and VT versions) and proprietary STAUFF Cushion Clamp Series profiles (SCS-048 and SCS-120). To ensure secure fastening, the profile used must comply with strict dimensional requirements: retaining lip width between 6 and 7.5 mm, minimum internal height of 20 mm, minimum internal width of 22 mm and maximum external opening width of 28 mm.

Summary Technical Table of the Main Features of the STAUFF Channel Rail Adaptor (Type CRA – Twin Series)

Product Codes