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Temporary Fasteners

Temporary Fasteners (Clecos): A Solution for Pre-Assembly Challenges

Temporary fasteners, commonly known as clecos, provide an efficient and reliable solution for addressing pre-assembly challenges in various industries, particularly aerospace. Designed to streamline pre-assembly processes, these fasteners are a go-to choice for holding components securely in place before permanent assembly.

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Expertise in Aircraft Pre-Assembly

Our team of technical field experts possesses comprehensive knowledge and expertise in aircraft pre-assembly processes. Leveraging this expertise, we manufacture advanced solutions tailored to meet diverse pre-assembly needs, including:

  1. Simple Clamping: Ensures parts are held firmly together for accurate alignment during pre-assembly.

  2. Drilling Template Holding: Facilitates precise positioning of drilling templates and secure clamping of metal or composite sheets through the template.

  3. Sealant/Liquid Shim Squeeze-Out and Drying: Supports efficient application and drying of sealants and liquid shims, ensuring optimal bonding and sealing.

  4. Pre-Load Retaining: Maintains necessary pre-load forces during the assembly process to ensure component stability.

  5. Gap Measurement: Assists in accurately measuring and managing gaps to achieve precise tolerances.

 Clampberry temporary fasteners

To address specificpre-assembly challenges, we offer a range of high-performance temporary fasteners and clecos tailored for unique requirements, including:

  • Large Diameters: Ideal for securely clamping components with larger cross-sections.

  • Hard Tool Holding: Provides robust fastening solutions for heavy-duty tooling applications.

  • Wide Structure Thickness: Accommodates thicker material assemblies with ease.

  • Clamping Through Hard Tool Bushings: Designed for secure fastening in precision-guided setups involving hard tool bushings.

Tool Range for Adjustable Pre-Loads

Adjustable Pre-Loads: Enables fine-tuning of clamping forces to match specific assembly requirements.

Accessibility in Confined Areas: Designed for optimal performance even in restricted spaces, ensuring versatility across various assembly environments.

 Temporary fasteners application Temporary fasteners application 2

The range of CLAMPBERRY temporary fasteners or clecos are unique in the aerospace market. Built step by step to answer successive customer challenges, it represents today dozens of standards for various applications which can be declined in different diameters and grip ranges. Depending on the environment of the installation, on the structure to pre-assemble, on the tension to sustain, on the application to secure, we can provide the appropriate pre-assembly solution. The product range is wide but here are a few of our major technical concepts:

  • for small thickness sheets pre-assembly under low pre-load, our manually operated Series 1000 and 1100
  • for rubber sealant applications, our most common TF-26/-28/-41/-42/-44H series
  • for drilling template holding and further structure clamping:
    – our combination of TF-80 and TF-81 series for standard preassemblies,
    – our TF-355, TF-351 and TF-352 series for confined areas and restricted environments
  • for more complex and precise pre-assemblies, our CAL concept
  • for composite structures, our TF-CC, TF-CCG, TF-348CC, TF-350...
  • for automated pre-assemblies, our newly TF-CCTFR, TF-61 and related effector

temporary fasteners selection

If you don’t find the suitable TF system among the hundreds of solutions offered in this guide, you have a challenge we are interested in!
Our technical field experts have acquired a complete and thorough knowledge of aircraft pre-assembly. We have the right approach to help you specify your needs and can bring you the solution in a timely manner.

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SUMMARY OF TEMPORARY FASTENERS

Category Series Description
Structure Clamping TF-1000/1100, TF-20, TF-30M, TF-41M General-purpose temporary fasteners, manually operated, with easy installation.
Standard TF-30/32, TF-41, TF-42, TF-41CC/42CC, TF-49H Torque-controlled fasteners ensuring secure pre-assembly. Some series include hexagonal or cylindrical drives for efficiency.
Liquid Shim TF-R, TF-29 Special fasteners designed for resin applications, preventing adhesion of solidified resin for easy removal.
Low Profile TF-22/25, TF-26/27/28, TF-336CC, TF-348, TF-348CC, TF-351, TF-355, TF-372, TF-373, TF-391 Designed for applications with limited access. Some have non-protruding designs, narrow bodies, or enhanced gripper surfaces for better hole alignment.
Low Calibrated Preload TF-1000CCS, TF-41CC-XDAN, TF-44H Temporary fasteners with controlled preload for precise assembly requirements. Low preload versions available.
Special TF-353, TF-42CCF, TF-81, TF-83, TF-CC, TF-HCH, TF-MCCH4 Designed for specific use cases, such as countersunk jaws, high accuracy clamping, or blind hole applications.
Jig Holding TF-350, TF-352, TF-45G, TF-49GH, TF-80, TF-82, TF-CCHG Used in high-precision jig positioning and adjustments, often featuring small diameters for enhanced accuracy.
Automation TF-329CC, TF-624, TF-63, TF-632 Designed for robotic or automated installation, compatible with specialized tools and composite materials.
Clamps TF-PRA Used for structure clamping without holes. Provides mechanical clamping without the need for drilling.

Temporary Fastener Drivers

We offer all combinations of motor, power, and nose type to answer every accessibility or maintenance needs:

temporary fasteners selection

Features such as the temporary fastener locking system or the adjustable rotating speed for battery drivers enable the use of temporary fasteners in areas with strict marking constraints. All drivers can be calibrated in torque for precise control of preload values and pre-assembly processes.

temporary fasteners selection