The ISG Group
Interconnect Solutions Group brings together seven specialist businesses operating across the UK, USA and Europe — each with deep expertise in their market, united by shared standards and a common commitment to technical excellence.
01
Rayfast UK
🇬🇧 Redditch, United Kingdom
Rayfast is the original Interconnect Solutions Group business, established in the early 1990s in Redditch, UK. For over three decades Rayfast has been supplying specialist heat shrink tubing, wire, cable and accessories to the most demanding industries in the world.
Operating from a purpose-built UK distribution facility, Rayfast holds millions of pounds of stock across its product range with same-day despatch capability. Its deep supplier relationships — particularly with the world's leading heat shrink manufacturers — give customers access to technical support and genuine, specification-compliant product.
02
Rayfast USA
🇺🇸 United States
Rayfast USA extends the Rayfast product range and technical expertise into North American markets, providing US-held stock and local technical support for aerospace, defence and industrial customers across the United States.
The US operation enables dual-source supply capability for transatlantic programmes, ensuring continuity of supply for customers operating across both UK and US markets — particularly important for defence programmes with domestic supply requirements.
03
Rayfast s.r.o.
🇨🇿 Czech Republic
Rayfast s.r.o. serves the Central and Eastern European market from the Czech Republic, providing local-language technical support and EU-held stock across the full Rayfast product range.
Positioned to serve German, Czech, Slovak and broader European customers, Rayfast s.r.o. provides the rapid, responsive service that the Rayfast group is known for — with the added benefit of local market knowledge and EU customs simplicity.
04
Sommer GmbH
🇩🇪 Germany
Sommer GmbH is a German specialist in precision cable and connector assemblies, serving demanding industrial, medical and automotive customers across Germany and continental Europe.
With deep engineering capability and strong relationships with European OEM customers, Sommer brings a level of technical precision and application-specific expertise that complements the broader ISG group's distribution strength. The business is particularly known for bespoke cable assembly work to tight specifications.
05
LJR Electronics
🇬🇧 United Kingdom
LJR Electronics is a UK connector specialist with broad stock coverage across circular, rectangular and PCB-mount connector families. The business has built a strong reputation for deep technical knowledge of MIL-SPEC and COTS connector selection.
LJR's strength lies in its ability to support complex connector requirements across defence and industrial programmes — from standard MIL-DTL-38999 connectors to specialist filtered and EMI-shielded variants. The team's application knowledge helps customers navigate complex connector specifications with confidence.
06
Cabletec
🇬🇧 United Kingdom
Cabletec is a UK-based cable and wire specialist serving a broad range of industrial, marine and rail customers. The business is known for its deep stock, fast response and technical knowledge of cable constructions and environmental ratings.
Cabletec's product range spans industrial power cable, marine-rated cable, instrumentation cable and specialist wire — all held in UK stock for rapid despatch. The team's practical knowledge of cable selection for challenging environments makes Cabletec a trusted partner for MRO and project procurement teams alike.
07
Astro Industries
🇬🇧 United Kingdom
Astro Industries is the ISG group's motorsport and high-performance specialist, supplying Formula 1, WEC, IndyCar and GT racing teams with ultra-lightweight wire, sealed connectors and fire-protection sleeving under race-day lead times.
In motorsport, every gram counts and lead times are measured in hours. Astro Industries has built its entire operation around these demands — holding specialist lightweight and high-performance interconnect products in stock, with a team that understands race programmes and responds accordingly.
Interconnect Solutions Group is a division of Diploma PLC, a FTSE 250 company specialising in the supply of specialised technical products and services across the life sciences, seals and controls sectors.
Diploma's model is built around high-quality, value-added distribution businesses operating in markets where technical knowledge and reliable supply chain management are critical differentiators. ISG businesses benefit from Diploma's financial strength and governance while retaining the specialist focus and agility that makes them valuable to their customers.
FTSE 250
London Stock Exchange
£2bn+
Annual Revenue
20+
Group Businesses
3
Core Sectors