Skip to content Skip to main navigation Skip to search
HardLine - Hardening machines and hardening systems

HardLine: Heat treatment systems

HardLine is EFD Induction’s family of heat treatment systems for surface and through hardening, comprising a complete range of stationary systems for all types of workpieces requiring hardening, tempering and annealing.

Systems for every hardening job

  • For simple and complex geometries: HardLine includes vertical, horizontal centerless, rotary table, crankshaft and customized machines.
  • Comprehensive range: From small, manually loaded machines to large, automatic turnkey hardening plants complete with component handling, washing, straightening and tempering capabilities.
  • Versatile: Hardens gears, camshafts, drive shafts, crankshafts, torsion bars, couplings, rocker arms, rock drills, chains, suspension arms, clutches, brake discs, steering racks, CV joints, tulips, shock absorbers, inner and outer races, control rods, valves and output shafts.
  • Optimum results: At the heart of each HardLine machine is an EFD Induction Sinac heat generator, the industry’s most advanced induction frequency converter. These acclaimed converters help ensure optimum hardening results—day in and day out, year after year.
  • In-line integration: Includes a full range of hardening systems for in-line integration—which results in shorter lead-times. This key benefit is enhanced by minimal foot-prints, easy installation, user-friendly controls and clever design features for quick and easy set-up, changeovers, cleaning and maintenance.
  • High availability:  Choosing HardLine means choosing proven mechanical solutions and high availability. Modular sub-assemblies, along with the use of modules from proven suppliers, further ensure the reliability of our solutions.
  • Latest technical features: Your HardLine solution incorporates the very latest in induction science—ensuring you get the most efficient and reliable systems available.
  • Spares, services and training: With manufacturing plants, parts distribution systems and representatives in Asia, Europe and the Americas, EFD Induction can offer customized preventive maintenance programs as well as training programs, so your operators can make the most of your HardLine system.

Learn more

Induction heat treatment machines
HardLine - Industrial heat treatment systems

HardLine is EFD Induction’s family of heat treatment systems for surface- and through-hardening.

Download brochure
HardLine Horizontal heat treatment machines, HardLine Hybrid
HardLine Horizontal heat treatment machines

Introducing the HardLine Hybrid horizontal hardening machine. The world’s fastest and most flexible Horizontal hardening machine

Download brochure
HardLine Vertical heat treatment machines
HardLine Vertical heat treatment machines

HardLine vertical hardening systems are available in four machine types, each one designed for a range of workpiece sizes: VS, VM, VL, VXL.

Download Brochure
Energy management system
Energy management system

The Energy Management System is an option for your HardLine - heat treatment system. It is a professional way to minimize energy consumption.

Download brocure

All family products

HardLine Hybrid - Horizontal pusher and continous system
Horizontal systems Go to product
Vertical heat treatment systems
Vertical systems Go to product
Heat treatment systems - Rotary table
Rotary table systems Go to product
Crankshaft induction heat treatment systems
Crankshaft systems Go to product
Induction heat treatment systems
Custom engineered systems Go to product
HardeLine Energy Management System
Option: Energy management system Go to product


Crankshaft hardening - The benefits of induction heating

EFD Induction crankshaft hardening systems are a proven way to meet stringent specifications, while at the same time minimizing costs.

Induction hardening. What makes it so effective?

Learn about the potential and benefits of induction hardening.


A twin cabinet EFD Induction vertical hardening machine.

A twin cabinet EFD Induction vertical hardening machine for hardening of camshafts.

A double station EFD Induction vertical hardening machine hardening camshafts

A double station EFD Induction vertical hardening machine hardening camshafts.

Induction heating - hardening camshaft

Double hardening for double productivity. The quenching phase inside a single cabinet hardening machine with twin tailstocks and centers.

Induction heating - vertical hardening

An EFD Induction vertical hardening machine in action. The chuck connection behind the workpiece lets you use the same machine for either high or medium frequency hardening.

Induction heating - hardening large rings and gears

HardLine heat treatment solutions for hardening of large rings and gears