HVAC Union End Metal Bellows
For axial compression with a BSP union swivel at both ends.

Union End Metal Bellows
FlexEJ union-end HVAC axial compression expansion joints come with a BSP union swivel at both ends complete with fibre washer and stainless steel convoluted bellows from DN15 (15mm) to DN50 (50mm):
Union End Metal Bellows
What is a Union End Metal Bellow?
BSP female unions for threaded connections and axial compression..
- Materials
Stainless steel 316 bellows with iron BSP unions. - Application
Heating water and most water services, not suitable for drinking water. - Rating
6 Barg @ 150°C. - Web Shop
Available online with next day delivery from our web shop.
Union End HVAC Metal Bellows
Size | Length | Pressure Rating | Movement | In Shop |
---|---|---|---|---|
DN012-½" | 181 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
DN020-¾" | 187 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
DN025-1" | 191 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
DN032-1¼" | 207 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
DN040-1½" | 215 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
DN050-2" | 229 | 6 Barg @ 150 ºC | Axial +0/-25 mm | Yes |
How to specify a metal expansion joint






Can't see what you want? Need help?
Call us. Or use Live Chat.
For instant advice. We can custom-design and engineer almost any expansion joint you need for delivery in the UK or worldwide. Call our expert team on +44 (0) 1384 881188. Or email us sales@flexej.co.uk
FlexEJ's Union End Metal Bellows
For use on threaded connections and axial compression
316 stainless steel bellows | Threaded female BSP |
Iron swivel unions | Rated 6 Barg @ 150°C |
Minimum length design | For axial compression |

Specifications
All sizes available from our web shop
For ratings and dimensions please see our catalogue or range tab above.
Got a quick question?
Use Live Chat. Or call us.
For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188
HVAC Union End Metal Bellows Product Comparison Chart
Is the HVAC Union End metal bellows the best option for your application? Two potential alternatives to consider:
WRAS approved WRAS approved bellows
Is this bellow approved for use in all UK public mains water supplies?
Potable water Potable water
Is this bellow approved for water systems used for drinking and food preparation?
Rating barg/°C Pressure & temperature
What is the required pressure rating (in barg) compared to temperature rating for this bellow?
Not sure what flange spec you need?
Use the FlexEJ Flange Finder to find out
FlexEJ stock a full range of specs and types for our bellows. Or call our expert team on +44 (0) 1384 881188.
Who can you talk to?
Try our sales and customer service team on 01384 881188
They don't bite. And they know what they're talking about. Call the team any time from 9am to 4pm weekdays or use LIVE CHAT if you would prefer a quick text answer. For more complex queries, send us any pro-forma documentation using the get a quote form below or email us sales@flexej.co.uk.
Can't quite find the right bellow?
Try the FlexEJ Bellows Finder
Or call our expert team on +44 (0) 1384 881188
Frequently Asked Questions
In addition, FlexEJ holds a large stock of the most popular sizes and types of Elaflex rubber bellows as well as our HVAC value bellows range.
Please visit our full FAQ page to see all our frequently asked questions.
Need a detailed quote?
Get A Quote. On us.
We will provide full technical details together with, pricing and shipping timescales. For more complex engineered quotes, preliminary sketches and calculations will be available.
Got a quick question?
Use Live Chat. Or call us.
For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188
Get A Quote
Please complete the short form here and we'll get back to you within 24hrs Monday to Friday (quicker if marked urgent).
Alternatively, you can also call our expert team directly on +44 (0) 1384 881 118 from 8:30AM to 4:30PM weekdays who will be only too pleased to talk through your requirements and technical queries over the phone.
Visitors are also welcome Monday to Friday although please get in touch beforehand to let us know you're coming.
Industry experience
FLEXEJ Ltd was formed in 2002 by two professional engineers who brought together an already highly respected design capability with business and commercial skills gained in large multinational companies.
- Our focus has always been on application and design – helping our customers find the best value solution.
- We have a strong engineering and manufacturing team with experience in petrochemicals, refining, nuclear, desalination though to HVAC.
- The team is also very familiar with meeting complex requirements for documentation, in process NDT and test on projects. We have supplied many large end-users such as EDF, Exxon, Shell, Reliance & QatarGas working with major contractors such as JGC, Foster Wheeler & Technip.
