Our standard N-series hollow metal door has many features that are add-ons with other manufacturers
N-Series
Each hollow metal door comes with the core of your choice-our standard polystyrene, or one of three others - honeycomb, fiberboard or urethane. Our 1 3/4 inch N-Series are flush, constructed of two face sheets of 16 gauge, 18 gauge or 20 gauge cold rolled steel, stretcher-leveled quality of flatness. The vertical edges of our steel doors come with neat hemmed edge seams mechanically interlocked for maximum structural integrity. All hinge reinforcements are 3/16 inch steel projection welded to the steel door edge at three points above and 3 points below the hinge mortise. The top hinge reinforcement extends to the top of the door and has three extra projection welds on the extended leg.
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