Flex 1 48.3–168.3 mm
Flexible, non-restrained coupling for small diameters. Allows axial movement and up to 5° angular deflection.
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Straub Couplings
Straub® Couplings
Swiss-made mechanical couplings for fast, safe pipe connections across water, wastewater, mining, industrial and marine systems. Installed with a torque wrench – no hot work.
Why choose Straub
- Cold-work installation; no welding or flame
- Absorbs vibration, noise and angular deflection
- Works on multiple pipe materials and rough surfaces
- Low profile and lightweight for tight spaces
- IACS approvals available for marine projects
At-a-glance
- Sizes: 21.3 mm to 2032 mm (stocked)
- Working pressure: up to 67 bar (6,700 kPa) model-dependent
- Temperature: −30 °C to +100 °C (seal-dependent)
- Materials: 316L stainless steel housings; EPDM/NBR/FKM seals
Straub product range
Flex 2 172–2032 mm
Large-diameter flexible coupling with low-profile housing. External restraint required.
View Flex 2Flex 3 172–2032 mm
Heavy-duty flexible coupling for demanding sites; strong damping of vibration and shock.
View Flex 3Open Flex 1 48.3–168.3 mm
Split, wrap-around design for live-line repair on small pipes. No shutdown required.
View Open Flex 1Open Flex 2 172–2032 mm
Large-diameter split coupling for in-service repair of welds, pitting and short cracks.
View Open Flex 2Open Flex 3 172–2032 mm
Heavy-duty split coupling for critical infrastructure repairs with strong durability.
View Open Flex 3Grip L 21.3–609 mm
Axially restrained coupling with toothed anchoring ring; maintains electrical continuity on metal pipes.
View Grip LMetal Grip 26.9–406 mm
Ultimate pull-out resistance using hardened-tooth anchoring; for metal pipes only.
View Metal GripNeed something else (e.g. Step-Flex, Combi-Grip or specialty models)? Get in touch.
Applications
- Water treatment and distribution
- Wastewater and sewage
- Industrial process lines
- Mining and utilities
- Fire protection systems
- Shipbuilding and offshore
Technical overview
| Working pressure | Model-dependent, up to 67 bar (6,700 kPa) |
|---|---|
| Temperature range | −30 °C to +100 °C (seal-dependent) |
| Housing | 316L stainless steel (Flex 3 also available hot-dip galvanised) |
| Sealing | EPDM as standard; NBR and FKM available |
| Deflection | Up to 5° (model/size dependent) |
| Approvals | DIN 86128, ASTM 1476; IACS class approvals available |
| Design life | 25+ years with correct installation |
Non-restrained Flex/Open Flex models require external restraint/fixed points.
Request a quote
Pricing varies by diameter and specification. Contact our team for current pricing and availability.