Dayton Lamina 9-1212-21 Die Spring 3/4 in Blue Medium-duty

Product Description

The DAYTON LAMINA 9-1212-21 is a medium-duty die spring designed for use in metal stamping dies, punch press tooling, and similar industrial press applications. Built from chromium-vanadium steel, it features a D-shaped wire cross-section that increases contact surface area and improves load distribution compared to round-wire springs. Key ratings include a maximum deflection load of 158 pounds and a maximum deflection of 1.12 inches, with a travel-to-solid load of 1.22 inches. The blue color coding identifies this spring as medium-duty per ISO 10243 classification standards. Installation is performed by tool and die makers and industrial maintenance technicians.

This die spring fits tooling applications requiring a 3/4 inch hole diameter and 3/8 inch rod diameter with a 3 inch free length. It is suited for medium-cycle stamping and forming dies in automotive, fabrication, and general manufacturing environments. The maximum operating deflection is rated at 37.50 percent of free length, making it appropriate for applications requiring controlled, repeatable spring force within that deflection range. Compliance with ISO 10243, ISO 9001:2015, and NAAMS standards makes it a recognized fit for automotive supplier tooling programs.

Key Features

• Chromium-vanadium steel construction for fatigue resistance in cyclic press applications
• D-shaped wire profile improves load distribution and extends spring service life
• Maximum deflection load of 158 pounds at 1.12 inches deflection
• Blue color coding per ISO 10243 medium-duty classification
• Meets ISO 10243, ISO 9001:2015, and NAAMS standards for international and automotive tooling use
• Travel to solid load of 1.22 inches provides a defined compression limit

Compatibility

Designed as an OEM-style replacement or direct-fit component for stamping and forming die assemblies requiring a medium-duty die spring with a 3/4 inch hole diameter, 3/8 inch rod diameter, and 3 inch free length per ISO 10243 specifications.

Installation Notes

Die springs are installed and replaced by tool and die makers or qualified industrial maintenance personnel. Always de-energize and lock out the press before servicing any tooling components. Inspect the mating rod and bore dimensions for wear before installing a new spring, as oversized or undersized contact surfaces can cause premature failure. Do not compress the spring beyond its rated travel-to-solid load during setup or operation.