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Norton Overhead Concealed Closers

Model B-FReversible handingSized spring (B-F)Old Style: Rectangle shaftNew Style: Square shaft (1/4", 1/2" high)Identified by letter on the end plug

Model 78Reversible handingSized spring (B/D, E/F)Square shaftIdentified by letters at mounting holes

Model 700HandedSized springOld Style: Double 'D' shaftNew Style: Square shaftIdentified by # stamped on closer

Model 750HandedSized spring (D-E)Corner mountIdentified by # at end of closer

Model 1601/1601BFNon handed1601: Adjustable 2-61601BF: Adjustable 1-6Common hole patternIdentified by # stamped at closer end

Model 75/7700Non handed7500: Adjustable spring7700: Sized springIdentified by # at end plug

Model 8000/8100Non handed8000: Sized spring8100: Adjustable spring (1-6)Identified by # at end of closer