Unassailable Fit & Forget Pressure Moulded Cable Systems for Hostile Environments

Subsea Expo Company of the Year Winner banner

Unblemished reliability record: over 20,000 installations with zero leaks

The Central Nervous System for Critical Infrastructure

SMI designs and manufactures ‘fit and forget’ cable systems that form the central nervous system of platforms operating in hostile environments, including naval ships, submarines, aircraft, offshore power generation and transport.

Dedication and experience

In addition to installations in aerospace, energy and transport infrastructure, we are the preferred supplier for through-hull penetrators and connectors to the British Royal Navy’s nuclear submarine and surface fleets. ISO 9001:2015 approved, SMI is the only company to continuously hold a Ministry of Defence Capability Approval Certificate for 27 years.

Unparalleled product performance is accompanied by a dedicated account management team, which work with customers from an early design stage to offer bespoke, precise, best of breed solutions. Fully supported by in-house design, engineering and QA teams, we provide timely delivery with ‘right first time, every time’ deployment.

SMI’s PlastEthUrm mouldings come with an industry leading 10 year warranty. With growing understanding of true through life costs, platform designers are drawing on our heritage of reliability to move away from a limited design life mentality, instead demanding 10 year warranties and a guarantee of performance over the long term. Rightly, manufacturers are being asked for assurance not rhetoric.



Bespoke, precise, right first time, every time… fit and forget!

What our customers say

We got the project completed and the system installed, the client is extremely happy with the result. Without the dedication and commitment of companies like SMI there is no way this would have been possible – we thank you again for that.

Quoceant Ltd

Your teams… have been easy to talk to and proactive and ready to work as a team with us. Overall I think SMI are possibly the best subcontractor or partner we work with.

Engineering and Technical Manager

To get from an initial request for quotation … through design change, approval, procurement, manufacture and delivery either on or ahead of schedule is remarkable.… to have an improved solution in such a relatively short period of time is greatly appreciated.

Sub Contract Manager
Atlas Elektronik

Babcock are now using this SMI document in shaping the expectation of other suppliers in best practice.

QA Manager
Babcock International Group

It has always been a pleasure to work with SMI who are a flagship for “SME” sized businesses in the UK. As an engineer what I appreciate most is the engineering support which is both timely and of excellent quality.

Hardware Architect

It has always been a pleasure to work with SMI who are a flagship for “SME” sized businesses in the UK. As an engineer what I appreciate most is the engineering support which is both timely and of excellent quality.

Account Manager

Please pass on my gratitude to the whole SMI team. You are all heroes. Saying that though as an ‘on-site hero’ myself I am aware of the extra mile we’ve had to go through during this challenging year.

Mechanical Engineer

We would like to thank SMI and the whole team for their continued support and high level of service.  The proactive approach by the team to switch around the manufacturing schedule … was greatly appreciated by BAES and helped alleviate some of the potential risks to the schedule.

Procurement Leader
BAE Systems Submarines

The standout is the agility that SMI bring to the project, supporting changes while achieving delivery.

Senior Project Manager
BAE Systems Submarines

I’m really impressed at the professional can do attitude… SMI delivering on this project is not a risk or concern I have at all.

Project Procurement Manager

I wanted to thank the team at SMI for pulling out all the stops and producing a new cable for us in record time. Thanks to the teams great work, we were able to maintain our schedule for deployment of turbine 2 at our MeyGen project.

Chief Executive Officer
Sustainable Alternative Energy