Assembly and Packaging Services

The injection mould assembly tasks that we complete on-site include bonding together components, applying oil or other substances and fitting O-rings. We can also take care of self-tapping screw assemblies, nut and bolt assemblies and packaging products into boxes or bags, with a heat seal or staple header card.

We have experience in ultrasonic welding and can give advice on the suitability of this. At every stage of the assembly process, we consistently check for quality and make sure that everything is running smoothly.


Colour matching, post machining and thread inserting

If you’d like to colour match parts, we can take care of it with a choice of options to suit your budget. Where threads are concerned its often cost restrictive to have these moulded into the products. We would assess the product design and make sure you get the most cost-effective components possible. We can create internal threads by tapping plastic parts rather than having a thread-removing device in the tooling. We can also source strong brass or stainless steel thread inserts, if you need something very strong. These would either be moulded during production or press-fitted afterwards.

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Explore the process

With over 50 years of experience in injection moulding, we’ve refined the process to produce cost-effective, quality parts at scale. Here’s how we do it.


Whatever you need, we’re here to make it.

Fill in the enquiry form and our friendly team will get back to you as soon as possible.

Get in touch


Moulding your future

We work with companies of all sizes, offering totally bespoke plastic injection moulding, toolmaking and rapid prototype services.

Whatever your need, we can custom make it exactly to your brief. We pride ourselves on our extensive technical expertise and we can explain all the manufacturing details along the way.

From designing a component to choosing materials and assembling tools so they’re ready for action, we provide a cost-effective, high-quality solution for designers and engineers looking to mass produce plastic parts and tools.

Leicestershire’s leading plastic injection moulding company


You don’t need to take our word for it. Here’s what our customers have to say.

  • We have worked with Ledwell for many years, always a great service!

    Charlotte Smith Avatar Charlotte Smith

    Great company! We have been working with Ledwell for many years and have always found them to be friendly and helpful. Matt and Shirley in particular provide an excellent service.

    Peter Smith Avatar Peter Smith

    Been here for years, something must be right.

    adie seare Avatar adie seare

    We are only a small customer to them but always feel valued, would not hesitate to recommend them.

    Andy McCaughan Avatar Andy McCaughan
  • Great injection moulding company! High-quality services and friendly and helpful staff. Highly recommended!

    Aditi Dharmesh Avatar Aditi Dharmesh

    Great people, true British manufacturing thoroughbred

    Peter Wilkinson Avatar Peter Wilkinson

    Great place to work with likeminded brilliant people.

    Benn Simms Avatar Benn Simms

    Great blokes on Goods in.

  • Manufacturers of High Quality Injection Moulded Plastic Products #InjectionMolding #Toolmakers #Moulders

    Balu Nandigam Avatar Balu Nandigam

    10/10 would go again

    72gaming 72gaming Avatar 72gaming 72gaming