Dayton Lamina 9-4012-21 Die Spring Blue Medium-duty

Product Description

The DAYTON LAMINA 9-4012-21 is a medium-duty die spring designed for use in stamping dies, punch press tooling, and similar industrial tooling applications. It features a 2.5-inch hole diameter, a 1.5-inch rod diameter, and a 3-inch free length. Manufactured from chromium-vanadium steel, this spring delivers consistent force and fatigue resistance under repeated cycling. The blue color coding identifies it as a medium-duty spring per ISO 10243 standards. Maximum deflection load is 1,956 pounds, with a maximum deflection of 1.12 inches. Installation and maintenance are typically performed by toolroom machinists, die setters, or maintenance technicians working on stamping and forming equipment.

This die spring is suited for medium-duty tooling applications in stamping dies, molds, and progressive dies used in automotive, fabrication, and general manufacturing environments. Its D-shaped wire cross-section maximizes load capacity while maintaining a compact profile within the die set. The 37.5 percent maximum operating deflection rating and 1.22-inch travel to solid load specification make it appropriate for moderate-cycle applications where controlled spring force is required throughout the stroke.

Key Features

• Medium-duty load rating with a maximum deflection load of 1,956 pounds
• Chromium-vanadium steel construction for fatigue resistance and durability under cyclic loading
• D-shaped wire cross-section provides higher load capacity relative to round-wire springs of the same envelope
• Blue color coding per ISO 10243 for quick duty identification in the toolroom
• Maximum operating deflection of 37.5 percent of free length
• Meets ISO 10243, ISO 9001:2015, and NAAMS standards

Compatibility

Designed as an OEM-style replacement or direct-fit die spring for medium-duty stamping die and punch press tooling applications requiring a 2.5-inch hole diameter and 1.5-inch rod diameter with a 3-inch free length.

Installation Notes

Die spring replacement is typically performed by trained toolroom machinists or die setters. Always de-energize and lock out the press before servicing any die components. Inspect the spring seat and rod for wear or damage before installing the new spring. Do not exceed the maximum operating deflection of 37.5 percent, as over-compression accelerates fatigue failure and can result in spring breakage.