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Humphrey Knock Cylinders HNSA are insert type cylinders that are designed for direct insertion into your finished product to become an unrecognizable, proprietary component of your equipment. 
Super short, super compact, and ultra light weight.  Knock cylinders minimize the size and weight of your finished product.  Highly versatile mounting:  The same cylinder adapts to panel, foot, and insert mounting. 
Unique threaded body design facilitates high precision mounting with center-line of piston rod.  Hex on nose provides mounting ease and rigidness.  Oil permeated bronze rod bushing provides long dependable cycle life.  No externally applied lubrication required.