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Quick Verdict 40H is the series name; 45H is the model prefix stamped into the part number. NLS files every 45H lock under its BEST 40H series category, and 40H accessories such as the A44070 H rose and 40HVITH thumb-turn indicator are listed "for 40H Series." Order by the full 45H string, not by the series name. The string tells you function (0N passage, 7R classroom, 7W or 7D storeroom, CARD classroom deadlock), lever style (14H, 15H), finish (… Read more