ISO 9001:2015 UKAS-accredited
Part of a Group with a 75 year heritage
550 tonne capacity
Worldwide Delivery
UK manufactured - Oldbury
Plastic Injection Moulding
We mould precision components for OEMs who can’t afford a part out of tolerance. Our discipline comes from 75 years of gasket-making at parent group Stephens Gaskets – when modern injection moulding was added in 2011, the tolerance culture came with it. The result: a UK moulder that thinks like a precision engineer, not a volume shop.
- 550 tonne capacity – inherited from Stephens Gaskets, est. 1947.
- ISO 9001:2015 quality systems with documented process control and traceability.
- Full in-house toolmaking – steel and aluminium tools, designed and built on-site.
- 90+ engineering polymers – material consultation included on every project.
Supporting Services
Overmoulding
Two-shot and insert overmoulding for sealed assemblies, soft-grip components and multi-material housings.
Insert Moulding
Brass, stainless and threaded inserts moulded direct into the part – no secondary assembly, no fastener failure.
Low-Volume Production
Aluminium tooling and right-sized presses for runs from 500 to 50,000 parts. Bridge production while steel tools are built.
Sectors we supply
Tier 1 and Tier 2 supply for interior trim, under-bonnet components and structural clips. ISO 9001 quality systems backed by documented PPAP support.
Moulding for medical device housings, single-use consumables and laboratory components. Full material traceability and documented batch control under ISO 9001.
Enclosures, connector housings and structural components in ESD-safe and flame-retardant grades. Clean moulding for sensitive assemblies.
Technical components in nylon, acetal, PEEK and PPS for demanding mechanical environments – bushings, gears, manifolds, housings.
Retail-ready mouldings, branded components and durable consumer goods – from prototype tooling to full production.
Industrial plastic components for drainage, fixtures, fittings and building service systems.
Also supplying Lighting, R&D and Prototyping.
Tier 1 Automotive OEM – 500,000 parts a year at 0.0005″ tolerance
A Tier 1 Automotive OEM moved a precision interior component to Stephens after dimensional drift at a previous supplier.
We rebuilt the tool, validated against the customer’s dimensional plan, and have now shipped over 2 million parts across the past four years.
The tool runs continuously on our 250-tonne press, with a documented reject rate below 0.05% and on-time delivery sustained throughout.
Designed for procurement and engineering teams
Buyer’s checklist
How to specify an injection moulding partner – a procurement checklist
The 12 questions to ask before placing a tool. Tolerance, material handling, quality systems, capacity headroom.
Automotive sector
Automotive injection moulding – Tier 1 and Tier 2 supply explained
What Tier 1 and Tier 2 status means for tooling, quality and PPAP – and what a smaller specialist moulder brings to the supply chain.
Process decision
Overmoulding vs insert moulding – when to use which
A practical decision guide for design engineers specifying multi-material components.
FAQs
Plastic injection moulding is a manufacturing process that injects molten polymer into a precision-machined steel or aluminium tool to produce identical components at scale. We use it to deliver runs from 500 prototype parts to several million serial production parts a year, in over 90 engineering polymers.
We mould 90+ engineering and commodity polymers, including ABS, polypropylene, polycarbonate, nylon (PA6, PA66, glass-filled grades), acetal (Delrin, Hostaform), PEEK, PPS, TPE, TPU and EVA. Material consultation is included on every project - if you're not sure which grade fits your application, we'll specify it.
We support runs from prototype quantities upwards - from short-run aluminium tooling through to multi-million-part serial production on hardened steel tools.
We supply OEMs in automotive, medical, electronics, industrial engineering, consumer products and construction. Our quality systems are ISO 9001:2015 certified, UKAS-accredited.
Tooling lead time is specification-dependent - typically 2 to 8 weeks from sign-off. We confirm a delivery date at quotation stage.
Yes. We run aluminium tooling and right-sized presses (25-tonne upwards) specifically for low-volume work - production runs from 500 parts upwards, prototype tooling, and bridge production while steel tools are being built.
Yes. Stephens Plastic Mouldings is ISO 9001:2015 certified, UKAS-accredited. Our quality systems include documented process control, full material traceability and dimensional reporting on every tool trial.
We mould in Oldbury, West Midlands - central UK, 15 minutes from the M5/M6 interchange. We supply customers across the UK and into mainland Europe, with most UK shipments delivered within 48 hours.
Ready to discuss your project?
Send us your part drawing or specification and we’ll come back to you within one working day.
No automated responses – your enquiry goes directly to a moulding engineer who can answer technical questions on materials, tooling and tonne capacity.
If you’d rather talk first, call us.
Call 0121 544 5808 OR Email sales@stephensplasticmouldings.co.uk.