The ISG Group
The Interconnect Solutions Group brings together nine specialist businesses across the UK, USA and Europe. Each operates independently in its own market, with its own customers and identity — held together by shared standards and a consistent approach to doing the job well.
01
Rayfast UK
🇬🇧 Swindon, United Kingdom
Rayfast traces its roots to the mid-1970s as a Raychem subsidiary, becoming an independent distributor in 1987. From its headquarters in Swindon, Rayfast has supplied specialist heat shrink tubing, wire, cable, accessories and more to the most demanding industries in the world for nearly four decades.
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.
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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, motorsport and industrial customers across the United States.
The US operation enables dual-source supply capability for transatlantic projects, ensuring continuity of supply for customers operating across both UK and US markets — particularly important for defence projects with domestic supply requirements. Rayfast USA also supports the North American motorsport industry, supplying the specialist wiring and interconnect products demanded by high-performance racing applications.
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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.
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Sommer GmbH
🇩🇪 Neuhausen, Germany
Founded in 1978 as a pure shrink tube dealer, Sommer GmbH has grown into a leading German distributor of shrink, cabling and connection technology. Based in Neuhausen near Stuttgart, Sommer became part of Diploma PLC in 1998 and is the ISG group's European distribution hub.
Sommer provides German-language technical support and locally held stock across heat shrink tubing, wire and cable, connector accessories and moulded parts — serving industrial, aerospace and automotive customers across Germany and continental Europe.
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LJR Electronics
🇺🇸 Miamisburg, Ohio, United States
Founded in 2013 and headquartered in Miamisburg, Ohio, LJR Electronics is a stocking distributor of industrial electrical connectors, connector accessories and braided sleeving — acquired by ISG in January 2022. The team brings over 50 years of combined experience in the Deutsch connector market.
LJR stocks Deutsch, Amphenol, Carlisle and Techflex product lines, with same-day US shipping and a focus on rapid, knowledgeable supply for truck & bus, marine, agriculture, emergency services and industrial customers across North America.
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Cabletec
🇬🇧 Weston-super-Mare, United Kingdom
Cabletec is the UK's leading manufacturer of EMI screening braids, earth bonding leads, copper braids, flexible busbars and power shunts — with over 30 years of expertise in metal braid manufacture. Based in Weston-super-Mare, the business serves defence, aerospace, motorsport and industrial customers worldwide.
In addition to its specialist braiding facility, Cabletec manufactures bespoke multicore cables and assemblies and stocks a broad range of high-performance wire and harness components — from rapid-response prototyping through to long-run programme supply.
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Astro Industries
🇺🇸 Dayton, Ohio, United States
Established in 1967, Astro Industries is a US specialist in military and commercial wire, cable, cable assemblies and accessories. Operating from a fully equipped plant in Dayton, Ohio, the company serves the military, aerospace, commercial and industrial sectors with an extensive product range and a reputation for fast, technically sound supply.
Astro holds significant stock of MIL-SPEC and commercial wire and cable products, with a sub-48-hour turnaround commitment and just-in-time inventory programmes. Value-added services include cut & strip, tinning, marking, kitting and twisted cabling.
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Filcon Electronic
🇩🇪 Taufkirchen, Germany
Founded in 1985 in Taufkirchen near Munich, Filcon Electronic GmbH has spent four decades building a reputation as one of Europe's foremost specialists in high-tech connector systems for safety-critical applications. Aerospace, defence and medical customers come to Filcon because they can't afford to get the connector selection wrong.
Filcon holds EN 9120 aerospace certification and ISO 9001 quality accreditation, supplying both standard and individually custom-engineered connector solutions to major aerospace, defence and industrial projects across Europe and beyond.
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Selwyn Electronics
🇬🇧 United Kingdom
Selwyn Electronics is a UK-based specialist in connectors, assemblies and interconnect solutions — the most recent addition to the ISG group. The team has deep experience in connector and assembly supply, with an established customer base and a focused, practical approach that fits well within ISG.
As part of ISG, Selwyn Electronics benefits from the group's scale, supplier network and shared technical resource — while retaining the specialist identity and direct customer relationships that define its offering. Full details are available at selwyn.co.uk.
View full profile →The Interconnect Solutions Group is a division of Diploma PLC, a FTSE 100 company specialising in the supply of specialised technical products and services across the life sciences, seals and controls sectors.
Diploma invests in specialist distribution businesses where deep technical knowledge and reliable supply set companies apart. ISG businesses get the backing and resource that comes with a major group, without losing the specialist focus and direct customer relationships that make them worth calling.
FTSE 100
London Stock Exchange
£1.7bn+
Annual Revenue
20+
Group Businesses
3
Core Sectors