All components used in our gearboxes are made with the very best European, Japanese and American equipment. The Swiss manufacturing plant and processes used to manufacture every HGT Precision Sequential Manual Gearbox include:

  • 3, 4 & 5 Axis horizontal and vertical machining centres
  • CNC gear grinding
  • Surface grinding
  • Deburring
  • 3 & 4 Axis CNC turning machines
  • Broaching & Slotting
  • Bore grinding
  • Micro polishing
  • CNC gear shaping
  • Wire cutting
  • Cylindrical grinding
  • Heat treatment


Precision Manufacturing of Motorsport Gearboxes

As you’d expect, the factories are ISO 9001- 2008 accredited, use Japanese quality systems like 5S, Kanban, Kaizen, have Lean Manufacturing and ERP systems to optimize and control drawings, documentation and workflow.

ISO creates efficiency and consistency in the manufacturing process.

We could have saved money and sand-cast our gearbox cases, but we chose CNC milling as we wanted the ultimate in strength and preciseness. Our gearbox casings start off as 60 kg blocks of billet 7075-T6 aluminium alloy. The robotic repeatability of the CNC machines allows us to reduce some of our tolerances down to just 5 microns. CNC milling creates a surface you cannot achieve with casting. There are no rough sand cast marks, no ridges and valleys, no pinholes, just a mirror smooth finish. 

Our race car transmissions contain only the highest quality precision components, controlled to finite tolerances, using only the highest grade of materials with documented monitored and controlled processes.

Our gear quality is DIN 5/DIN6. Gear profiles are ground on high technology gear grinding machines, with our gears having uniquely designed profiles for additional noise and heat reduction. Many other brands of race transmissions only have finished hobbed standard profile gears meaning their gear quality is around DIN 10-12. The lower the DIN number, the higher the accuracy of the gear and the better it performs in extreme conditions.

The Benefits of Diamond Ground Gears

Well, to begin with, diamond ground gear profiles have a smoother polished surface finish compared to finished hobbed gears, meaning less friction, so generate less heat. When we grind gears after heat treatment, we remove the distortions created by the heat treatment process maintaining much smaller tolerances for the gear tooth which allows them to run more accurately in the gearbox.

This vastly enhances contact and load of each individual tooth, which translates into the improved transmission of power, lower noise levels, less wear, lower running temperatures, and higher overall performance.