Established in 1860

In the years that followed, Herbert Buckley—succeeded by his daughter (a qualified metallurgist herself)—drove the company forward by investing in new technologies. Formerly known as Holt Brothers, and now part of the KTH Engineering Group as KTH Holts Ltd, the company is undergoing another period of rapid renewal and investment.

The modern day KTH Holts offers unmatched facilities and services. From the biggest Heat Treatment and Gas Carbonising Furnaces, to Vacuum Heat Treatment, PMI and Ferrite Testing, Straightening Services of Metal, Stainless Steel Hardening and Annealing to name just a few.

Whether you’re looking to enhance toughness, improve surface hardness, prevent oxidation, or minimally distort your material through heat treatment—our experts can support.

Our heat treatment solutions are certified for critical components within the Aerospace and Precision Engineering industries.

KTH Holts offer excellence, expertise and experience through accredited heat treatment services, which few others can achieve.

KTH Holts operate a wide variety of equipment types and sizes that provide our customers with an extensive range of processes and services to suit their needs.

The facilities we have, such as large furnaces heat treatment, precision-controlled heat treatment ovens and vertical heat treatment solutions, result in us being able to offer services to a comprehensive pool of diverse customers.

Each and every item that goes through our works receives the same technical consideration for its heat treatment needs and specifications. The optimum treatment is then designed for each customer’s order. We draw on our vast experience and the widest range of capabilities to offer optimum and cost effective solutions always making sure our quality standards are at the forefront of what we do.

The relationships we maintain and develop with our customers are the key to our success and longevity. Being part of the KTH Engineering Group now means we can devise comprehensive solutions for the better service of customers.

Quality is at the forefront of our business. We adhere to the same high-standard, quality processes in every job we complete. This is a testament to the longevity of our business, and why we continue to be industry leaders in the field of heat treatment.