Dayton Lamina 9-1210-21 Die Spring Blue Medium-duty

Product Description

The DAYTON LAMINA 9-1210-21 is a medium-duty die spring designed for use in stamping dies, press tooling, and industrial mold assemblies. Built from chromium-vanadium steel, it features a D-shaped wire profile that provides consistent load performance and resistance to fatigue under repeated compression cycles. The spring has a 0.75-inch hole diameter, a 0.375-inch rod diameter, and a free length of 2.5 inches. Maximum deflection load reaches 163 pounds at 0.94 inches of maximum deflection, representing 37.50 percent of free length. Installation and setup are handled by tool and die makers, press technicians, and industrial maintenance professionals.

This spring is suited for medium-duty applications in stamping, forming, and progressive die tooling. The blue color coding identifies it as a medium-duty rating per ISO 10243, making it straightforward to sort and replace during die maintenance. Typical installations include stripper plates, pressure pads, and return mechanisms in hydraulic and mechanical press operations. Sold individually with a minimum order quantity of one.

Key Features

• Chromium-vanadium steel construction for fatigue resistance under cyclic loading
• D-shaped wire profile for consistent spring rate and stable seating
• 163 pounds maximum deflection load at 0.94 inches travel
• 37.50 percent maximum operating deflection of free length
• Blue color coding per ISO 10243 medium-duty classification
• Travel to solid load of 1.02 inches

Compatibility

Designed as an OEM-style replacement for medium-duty die spring applications requiring a 0.75-inch hole diameter, 0.375-inch rod diameter, and 2.5-inch free length per ISO 10243 dimensional standards.

Installation Notes

Die spring replacement should be performed by qualified tool and die technicians with the press de-energized and all stored energy released before disassembly. Inspect the mating rod and bore dimensions for wear before installing a replacement spring. Avoid exceeding the rated maximum deflection to prevent permanent set and premature failure. Consult applicable tooling drawings and ISO 10243 guidelines for correct spring selection and stack configuration.