Straight Locks are The most widely used lock in the industry. Designs are virtually identical between all manufacturers with the exception of material, coatings, grease grooves and graphite plugs. Straight locks were designed to eliminate the thermal expansion problem, allowing the locks to move freely in one direction, while maintaining location on the opposite direction. Installing four locks will ensure the mold is always on center regardless of the temperature differential between the two mold halves. The basic design has a male and female component each having a few ten thousands clearance per side.                

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