Prime Line Products H 3960 Universal Folding Crank Handle

Product Description

The PRIME LINE PRODUCTS H 3960 is a low-profile, folding crank handle designed for casement and awning windows. Constructed from diecast with a bronze-painted finish, it provides a durable, corrosion-resistant solution for window operation. The handle includes an aluminum insert that allows it to fit a variety of drive spline diameters, making it a universal replacement option without requiring an exact spline-size match. Installation relies on a standard set screw for secure fastening. This handle is typically installed by window glaziers, general contractors, and maintenance technicians handling residential or light commercial window service.

This crank handle is suited for casement and awning window applications where window blinds, shades, or other interior coverings are present. The folding arm design collapses the handle flush to the window frame when not in use, eliminating interference with hanging window coverings and reducing projection away from the frame. It is a practical replacement for worn, broken, or missing crank handles in both residential and light commercial settings where universal fitment across multiple spline sizes is required. Sold in a package quantity of 6 units.

Key Features

• Folding arm collapses to reduce projection and prevent interference with window blinds and coverings
• Aluminum insert enables universal fit across a variety of drive spline diameters
• Diecast construction with bronze-painted finish for durability and a finished appearance
• Includes set screw for secure attachment to the window operator shaft
• Low-profile design suits installations where clearance between the handle and window treatments is limited
• Packaged in quantities of 6 for multi-unit or service-call efficiency

Compatibility

Designed as a universal replacement crank handle for casement and awning window operators accepting a variety of drive spline diameters. The included aluminum insert accommodates multiple spline sizes, broadening fitment across window operator types.

Installation Notes

Installation is performed by window technicians, glaziers, or general maintenance personnel. Before replacing the handle, ensure the window sash is closed and latched to prevent unintended movement during service. Secure the handle onto the operator shaft using the provided set screw, and confirm the folding arm operates freely without obstruction. Do not overtighten the set screw beyond hand-snug plus a firm quarter-turn, as diecast material can crack under excessive fastener torque.