Specialist sub-contract treatments

Delivering a truly complete manufacturing service means more than just precision machining. That’s why GW Martin works with a network of trusted, best-in-class suppliers to provide a full range of specialist treatments and finishes — so you don’t have to manage multiple partners.

Through our Approved Supplier Programme, we can coordinate every additional process your components require, ensuring they meet the same high standards as the parts we produce in-house.

Sub Contract Treatments3

Interested in joining our Approved Supplier Programme?

Services from our trusted partners

Our extensive network of NADCAP, CAA and ISO-approved suppliers allows us to offer:

Special finishing

  • Zinc, chrome, anodising and hard anodising
  • Cold chemical blackening
  • Painting and masking
  • Metal polishing and vacuum blasting

Heat treatment

  • Annealing
  • Normalising
  • Tempering
  • Stress relieving
  • Hardening (all types)

Metal finishing processes

  • Electroplating
  • Anodising
  • Painting
  • Phosphating
  • Passivation
  • Non-destructive testing (NDT)
  • Vacuum blasting

Other treatments

  • Plastic coating
  • Grinding
Sub Contract Treatments2

One supplier, total responsibility

By managing sub-contract treatments through our Approved Supplier Program, we help you save time, reduce costs and simplify your supply chain. You’ll have one trusted partner taking full responsibility for the finished product, while benefiting from specialist expertise in industries such as aerospace, automotive and defence.

Explore our other capabilities