What tolerances can you achieve?

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.

Do you provide in-house tool design and maintenance?

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.

Do you support PPAP and validation requirements?

We support structured tool validation and formal PPAP submissions where required, including dimensional reporting and documented process control.

What machine sizes do you operate?

Our injection moulding capacity ranges from 22 to 650 tonne clamp force, supporting both small precision components and larger industrial mouldings.

Do you support low-volume or high-mix manufacturing?

Yes. SGH manufactures approximately 1,000 active SKUs annually, operating within a disciplined high-mix environment supported by structured scheduling and tool lifecycle management.

Do you operate a cleanroom facility?

SGH operates a Class 8 cleanroom for controlled assembly and regulated manufacturing environments, supporting medical and technically demanding sectors.

Plastic Injection Moulding & Tooling Services UK

From in-house tool design to precision injection moulding and cleanroom assembly, SGH delivers fully integrated plastic manufacturing services in the UK. We combine structured engineering review, high-mix production discipline and long-term lifecycle management to support both innovative SMEs and established OEMs.

SGH serves national and international clients over 5 sites in Bolton, Greater Manchester.

Discuss Your Project

01.

Injection Moulding Production Capability

SGH delivers precision plastic injection moulding from 22 to 650 tonne presses, supporting both low-volume programmes and complex high-mix production environments. Our UK-based manufacturing model combines process discipline, integrated tool lifecycle management and structured quality control to ensure consistent, scalable supply across technically demanding applications.

22–650 tonne injection moulding capacity
High-mix, low-volume and scalable production programmes
c1,000 active SKUs manufactured annually
Integrated in-house toolroom support
Structured preventative maintenance and tool lifecycle management
Batch traceability with Insight123 digital integration (2026 rollout)
Cleanroom-compatible production workflows
Large range of polymers moulded, many with recycled material options.

For detailed technical insight into our moulding methodology, dimensional control framework and high-mix manufacturing model, explore:

02.

In-House Tool Design & Toolroom Engineering

Unlike moulders reliant on third-party tooling providers, SGH operates a fully integrated in-house toolroom. We design, manufacture, validate and maintain injection mould tools under direct engineering control, ensuring faster iteration, tighter dimensional stability and long-term lifecycle performance.

Full in-house tool design and manufacture
New tool build and refurbishment capability
Preventative maintenance and structured servicing programmes
Tool modification, repair and dimensional correction
UK and overseas tooling strategy management
Lifecycle planning aligned to production volumes

For deeper technical detail on tooling architecture and lifecycle performance, explore:

Manufacturing Capability Applied to Your Sector

Our engineering, tooling and validation capabilities are tailored across construction, regulated medical, defence and industrial markets. Explore how our manufacturing model adapts to sector-specific compliance, risk and supply requirements.

Explore Industries We Support

03.

Design for Manufacture & Engineering Collaboration

Effective injection moulding begins long before production. At SGH, every project passes through structured Design for Manufacture review to ensure component geometry, material behaviour and tooling layout are optimised for reliable, repeatable production. Our engineering collaboration reduces risk, protects tooling investment and shortens validation cycles.

Structured DFM review prior to tool manufacture
Draft angle, wall thickness and flow path evaluation
Material selection guidance aligned to application requirements
Shrinkage and dimensional stability modelling
Gate location and cavity strategy optimisation
Direct collaboration with client design and procurement teams

A karting board with heating pipes running within it.

For detailed engineering insight into our DFM methodology and material behaviour modelling, explore:

Close-up of an engineer using CAD software for vertical farm design on a desktop computer.

04.

Validation, Quality Systems & Regulated Manufacturing

SGH operates under structured quality and validation frameworks designed to support technically demanding and regulated applications. From first-off tool trials and dimensional verification through to serial production and controlled assembly, our processes ensure repeatability, traceability and documented performance across the full manufacturing lifecycle.

ISO 9001 quality management system
ISO 14001 environmental management framework
PPAP and structured validation capability
First Article Inspection (FAI) and dimensional verification
Batch-level traceability with Insight123 digital integration (2026 rollout)
ISO Class 8 cleanroom assembly facility for controlled secondary operations
Structured material handling and regulated packaging workflows

For detailed insight into our validation methodology, ISO frameworks and cleanroom capability, explore:

05.

Supply Chain Integration & Environmental Governance

Reliable manufacturing extends beyond production. SGH integrates warehousing, scheduled call-off programmes and Just-In-Time delivery models with structured environmental governance to support stable, transparent supply partnerships. Our operational framework aligns production output, logistics coordination and energy efficiency with long-term customer requirements.

Dedicated stockholding and scheduled call-off programmes
JIT and Kanban-aligned delivery scheduling
Weekly structured drop shipments
International shipping coordination
Integrated production and dispatch traceability
SGH Client Portal providing batch-level visibility (H2 2026 rollout)
100kWp on-site solar generation supporting energy efficiency
ISO 14001 environmental governance and emerging Scope 3 reporting capability

Showing a warehouse with boxes on shelves and people talking.

For further detail on our logistics integration and sustainability framework, explore:

Why Choose SGH as Your Manufacturing Partner

SGH combines in-house tool engineering, high-mix injection moulding capability and structured operational governance within a single UK manufacturing platform. Our long-term partnerships with both global OEMs and innovative SMEs reflect disciplined execution, consistent quality performance and reliable supply continuity.

47+ years of precision plastics manufacturing heritage
Vertically integrated toolroom and moulding capability
c1,000 active SKUs produced annually
High-mix production discipline with structured lifecycle management
Proven audit performance within national and multi-national supply chains
ISO-governed systems aligned to regulated sector expectations
UK-based manufacturing footprint supporting stable, responsive supply

Discuss Your Manufacturing Requirements

If you are seeking a manufacturing partner that combines engineering rigour with operational stability, we welcome a structured technical discussion.

Discuss Your Project