Straub Mechanical Couplings

Solid Solutions for Joining and Repairing all Types of Pipe

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Fast, safe, and easy to install, Straub Mechanical Couplings from Hamilton Kent provide a watertight seal for installation or repair of all types and sizes of pipe. No welding is required, which means significant installation time savings and no fire watch needed on the job site. Straub couplings have far fewer bolts than flanged connections, which further reduces installation time and headaches. No special tools or pipe end preparation is needed. Sealing and anchoring functions are independent in Straub couplings, reducing stress on the components and resulting in flexible connections that can compensate for misalignment and angular deflection.


Straub mechanical couplings provide an engineered solution that can be designed to meet exact pipe ODs or provided as a standard size offering to meet application requirements.

Versatile and easy to install, Straub mechanical couplings are used to repair and join pipes throughout many industries, such as:

  • Wastewater conveyance
  • Power plant water transmission
  • Marine applications
  • Commercial and residential piping systems
  • Transportation (piping under bridges)
  • Fire protection systems


Straub pipe couplings will join virtually all plain plain-ended pipe, including pipe made from different materials. Straub couplings can accommodate pipe diameters up to 150” (3.82m) and larger. Advantages of joining pipe with Straub couplings include:

  • No welding, saving time and labor on sight (no fire watch needed)
  • Installs easily and quickly
  • Perfect for confined spaces
  • Suitable for all types of pipes –steel, stainless steel, ductile iron, concrete, HDPE, and PVC
  • Straub coupling housings and components are made from 316 stainless steel and are corrosion resistant
  • Performs under high liquid temperatures – up to 100°C (212° F) with standard EPDM gaskets
  • Noise dampening
  • Reusability

Straub Solutions

Straub offers solutions to common problems found when joining pipes, such as:

  • Angular deflection – use Straub couplings to join pipes that have an angular deflection between pipe ends
  • Axial movement – compensate for axial movement of pipes with Straub-Flex, Open-Flex, and Air-Flex couplings
  • Misalignment – connect two misaligned pipes up to 1% of the pipe’s outside diameter
  • Difference in pipe diameters – connect pipes that have different diameters

If your project requires pipe joining, don’t hesitate to contact us to find a long-lasting, watertight Straub solution.


Pipe Joining Couplings

Versatile, durable and easy to install, Straub mechanical couplings offer the ideal way to join pipes safely and economically. Straub couplings can be customized for special applications and used for joining pipe made from different materials.

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Pipe Repair Couplings

The broad range of applications and ability to join different pipe materials makes Straub couplings ideal for repairs of all types and sizes of pipes.

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Pipe Joint Testing

The HK Test Coupling by Straub makes it easy to joint test straight wall concrete pipe and manholes. This external joint testing tool can maintain up to 50 psi/345 kPa of external joint pressure.

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Marine Couplings

Straub Metal-Grip and Straub Grip-L is ideal for for marine use. Thoroughly tested and authorized by marine approval bodies internationally, Straub couplings are recognized by the marine industry as lightweight, space-saving, quick and easy to install.

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