Metal Stitching

Metal stitching or metalocking is a method of repairing cracks in cast metals without the need for welding.

The Metalock Engineering Group has an excellent record with performing cast iron repairs using the cast iron stitching method. Using the metal stitching technique to fix metal cracks is the preferred solution as it is always a challenge to weld cast metals.

Cold Repairs on all Cracked or Broken Components

Cold Repairs on all cracked or broken components made from cast iron, cast steel or aluminium. Breakages usually occur because of overloading, accidents, equipment misuse or flaws in the casting.


Engine block repair using metal stitching
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Metal Stitching Repair Process

The illustration of the Metalock Repair System (Metalocking), shown below, is a basic repair to a flat surface.
Damage to more complex fractures and castings requires the Metalock Engineer to draw on his skills and knowledge in coping with both the difficulties of the component’s shape, its operation and its working environment.

This all has to be completed, often with a minimum downtime, frequently involving 24/7 working.

Some of the Advantages of the Metalock Process

  • Dampens and absorbs compression stresses
  • Provides a good ‘expansion joint’ for such castings as cylinder liners, diesel heads or any vessels subject to thermal stresses
  • Distributes the tension load away from fatigue points
  • Maintains alignment and original surfaces, since lack of heat produces no distortion
  • The vast majority of repairs can be done in situ, with little or no dismantling saving time and money

A trusted Technique Used to Repair Machines and Structures


Whilst the tried, tested and unique repair system is a repetitive operation, the application is as varied as the plant and machinery for which it is designed. This extends from ship’s engines to power presses and petro chemical installations to old structures and heritage buildings.

Over 70 years ago the Metalock Engineering Group developed special tools, jigs, fixtures and materials used in this simple but ingenious repair procedure and these tools enable the successful cold repair of all types of machines and in the restoration of heritage structures.

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