Locks are primarily used in industrial repairs although there are some automotive applications. Locks are used to add strength across a crack. They are used to stabilize the fracture site and to prevent expansion of the crack.
Special drill jigs are used to create a precision hole pattern in the casting. The locks are then driven into these patterns in a laminated fashion.
All of the LNS locks have an ability to pull the sides of the crack together. This is not done to close the crack but rather to prevent any spreading pressure from being applied to the repair site.
LNS locks are punched or wire EDM cut from aircraft quality 4130 steel plate. The locks are intended to be stacked or laminated to a depth of 80% of the thickness of the material being repaired. Bottom locks are thin and are stacked into the casting first. Surface locks are thicker and are intended to serve as a final "cap" on top of a stack of bottom locks. Surface locks are particularly useful when repairing uneven surfaces.
Use locks whenever the utmost strength is required. Always use the largest locks possible. Locks can NOT be bent around corners or curves. They must be installed flat. Use C Series pins on curves. It is often easiest to use L Series pins next to the locks and then continue the repair with C Series pins. The use of locks and CASTMASTERô pins will produce the strongest repair possible.
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