Summitglow Ltd

About us

Summitglow Ltd – Heat Treatment Specialists is a family owned company which was established in 1983 to provide salt bath heat treatment to the then abundance of cutting tool manufacturers in the area.

Originally located on a small riverside site in Sheffield, the company moved to new purpose-built premises in 1990. Further expansion took place with the purchase of a local heat treatment company in Sheffield in 1991 and again in 1995 with the acquisition of a nitriding company and site. The Nitriding company and the site where we Nitride now was originally part of Firth Brown Ltd and Nitriding has taken place on that site since 1929, albeit that the furnaces we use now are much more advanced!

Summitglow Ltd continues to expand and steadily grow and as such takes advantage of both traditional and new technologies. The company employs approximately 25 people operating from two sites within Sheffield. Both sites are open 24 hours per day, 5 days a week.

We operate our own fleet of commercial vehicles and offer delivery and collection to many areas within a 150-mile radius.

While still offering a comprehensive salt bath facility (both in terms of through hardening and austempering) Summitglow Ltd has now grown to provide the following facilities:

  • Sealed Quench Furnaces – Hardening, Case Hardening & Carbo-Nitriding
  • Belt Furnaces – Hardening, Case Hardening & Carbo-Nitriding
  • Vacuum Furnaces – Hardening, Ageing
  • Gas Nitriding Furnaces – Up to four metres capacity
  • Nitro-Carburising Furnace
  • Hot Chemical Blacking
  • Sub-zero (Cyrogenic) treatments

Working in many industries we are BS EN ISO 9001:2015 registered and in many instances work to QS9000 standards.

We have comprehensive testing facilities available which include Rockwell, Brinell, Vickers, Micro Vickers and portable hardness testing facilities.

In addition, samples can be cut, ground and mounted for microscopic examination.