Why Choose SGH for Injection Moulding?
22–650 tonne injection moulding capacity • In-house tool design and toolroom engineering • Class 8 cleanroom assembly capability • High-mix, low-volume manufacturing expertise • Approx. 1,000 SKUs manufactured annually • In-house EDM and CNC toolroom capability
Who we help
SGH works with organisations at different stages of their manufacturing journey.
Product Design & Development Teams
We collaborate at concept stage to translate CAD intent into manufacturable components, supporting geometry refinement, material selection and structured tooling strategy.
Engineering & Procurement Teams
We provide a stable UK-based manufacturing platform with in-house tooling, validation capability and supply chain integration designed to support repeatable production performance.
For more detailed technical guidance, explore our Technical Resource Centre or see our FAQs for specific answers.
Our Integrated Manufacturing Capabilities
Engineering-Led Manufacturing
Precision moulding performance is determined long before production begins.
Our Technical Resource Centre outlines how we approach:
- Design for Manufacture review
- Polymer behaviour and shrinkage
- Dimensional control and validation
- Tool lifecycle management
- High-mix production discipline
Why Us
Experience Combined with Continuous Evolution
Since 1978, SGH has supported a wide range of industries requiring consistent, repeatable plastics manufacturing.
That longevity reflects operational discipline, technical capability and the ability to adapt alongside customer requirements. Investment in digital traceability, solar generation and structured lifecycle tooling strategy ensures our manufacturing platform continues to evolve.
See the Services we offer.
47+
Years of Manufacturing
Experience
Manufacturing experience is not measured simply in years, but in the depth of engineering judgement developed over time. Across multiple industry cycles, material evolutions and production technologies, SGH has refined the practical understanding required to anticipate risk before it becomes cost.
That experience informs our approach to tooling strategy, validation planning and lifecycle management. It enables balanced decisions between speed, precision and commercial viability; particularly in technically demanding or high-variation production environments.
See the Industries we work with.
Our Partners
Brands & companies we work with.
SGH are proud to support industry-leading brands like JCB and Rockwell Automation — as well as countless innovative startups and growing businesses across the UK.
what we do for our clients
Client Case Studies
We support organisations ranging from innovative SMEs to global OEMs, delivering disciplined injection moulding partnerships built on long-term stability and consistent performance.
Beyond production, we collaborate directly with JCB’s UK design teams on polymer selection, structured Design for Manufacture review and tooling strategy. Our integrated warehousing solution supports weekly scheduled deliveries aligned to JCB’s JIT and Kanban systems, reducing internal overhead and protecting supply continuity.
SGH is ranked within the top 20 percentile of JCB’s global supplier performance assessments.
During a 2025 supplier assessment at our Bolton facility, Rockwell’s audit team reported zero recorded quality defects or claims across our supply history. As stated during the visit:“We have reviewed our records and there are no quality defects or claims on your record — not figuratively, but literally. You are our best performing supplier.”
Following this assessment, SGH was invited to Poland to discuss expanding the SKU portfolio in support of continued growth.Consistent audit performance and long-term relationships underpin our position as a trusted supplier to both national and multi-national organisations.
During the COVID-19 pandemic, we rapidly restructured production, implementing dedicated supply cells and transitioning to twin-shift operations to meet urgent demand increases. This ensured uninterrupted component supply to Oxylitre’s Manchester manufacturing facility during a period of exceptional national pressure.
Our long-standing partnership reflects operational agility combined with the stability required for regulated, healthcare-related supply chains.
For over 15 years, we have supplied precision injection moulded components integral to ThermaSkirt production, supporting product refinement, scaling and consistent supply. Our involvement has evolved alongside the product itself, ensuring manufacturability, stability and production efficiency as demand has grown.
The partnership reflects SGH’s ability to support innovative SMEs as they transition from early-stage development into sustained commercial manufacturing.
Frequently Asked Questions
Injection moulding typically achieves tolerances around ±0.1 mm for many engineering-grade applications, depending on material and tool design. Dimensional stability is controlled through structured DFM review, precision tooling and validation processes.
Explore: Dimensional Control & Tolerances
Yes. SGH operates an in-house toolroom supporting tool manufacture, modification and lifecycle servicing. Approximately 85% of tooling is fulfilled through our internal engineering capability.
Explore: Tool Design & Toolroom Engineering
We support structured tool validation and formal PPAP submissions where required, including dimensional reporting and documented process control.
Explore: Tool Validation & PPAP
Our injection moulding capacity ranges from 22 to 650 tonne clamp force, supporting both small precision components and larger industrial mouldings.
Explore: Injection Moulding Process
Yes. SGH manufactures approximately 1,000 active SKUs annually, operating within a disciplined high-mix environment supported by structured scheduling and tool lifecycle management.
Explore: Low Volume & High Mix Manufacturing
SGH operates a Class 8 cleanroom for controlled assembly and regulated manufacturing environments, supporting medical and technically demanding sectors.
Explore: Cleanroom Assembly & Controlled Environment Manufacturing
accreditations and associations
Quality Systems & Accreditation
