Constant force extension springs from Stock Drive Products are designed for use in any application requiring a smooth and steady force for retracting or returning, such as in door and drawer closers, clamps, bands and clips. They are also used as magazine feed drives in vending machines and assembly line machinery.

Identified as the A 3X50 Neg'ator® series, they offer high stress and long deflection which offer significant advantages over conventional coiled springs when used in applications where low or zero gradient is desired, where limited space is a factor, where large extensions are required and where high initial force at initial deflection is desired. The springs feature widths from 3/16" to 2", made of 301 stainless steel and are provided with at least one punched hole in the free end for fastening purposes. The maximum recommended load per spring ranges from .23 lbs. to 40.9 lbs.

Complete technical specifications are contained in Catalog D790, available as a free download from SDP.

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