Dayton Lamina 9-1248-21 Die Spring 12 Inch Blue Medium-duty

Product Description

The DAYTON LAMINA 9-1248-21 is a medium-duty die spring built for use in stamping dies, punch presses, and metal fabrication tooling. It features a 3/4 inch hole diameter, a 3/8 inch rod diameter, and a 12 inch free length. Constructed from chromium-vanadium steel with a D-shaped wire profile, it delivers consistent force and fatigue resistance through repeated press cycles. The blue color coding identifies it as a medium-duty spring per ISO 10243 standards. Maximum deflection load is 156 pounds at 4.5 inches of deflection, making it well suited for applications requiring controlled, repeatable spring force within a compact die set.

This spring is intended for installation in metal stamping and forming die sets across industrial and automotive tooling environments. It fits standard die spring pockets where a 3/4 inch bore and 3/8 inch guide rod are used. The 12 inch free length suits deeper die assemblies or applications requiring extended travel before reaching solid height. Tool and die makers, press operators, and maintenance personnel working with progressive, compound, or forming dies are the primary installers of this component.

Key Features

• Medium-duty blue color code per ISO 10243 for quick identification and interchangeability
• Chromium-vanadium steel construction for high fatigue resistance under cyclic loading
• D-shaped wire profile for increased load capacity relative to round-wire springs of the same envelope
• Maximum deflection load of 156 pounds at 4.5 inches of travel
• Travel to solid load of 5.21 inches provides a clear margin before coil bind
• Compliant with ISO 10243, ISO 9001:2015, and NAAMS standards

Compatibility

Designed as an OEM-style replacement or direct-fit die spring for industrial stamping and forming die sets using a 3/4 inch bore pocket and a 3/8 inch guide rod, where a 12 inch free length medium-duty spring is specified.

Installation Notes

Die springs of this type are installed by tool and die makers or press maintenance technicians. Before servicing or replacing springs in a die set, de-energize the press and follow lockout/tagout procedures per applicable OSHA and facility safety standards. Never compress a die spring beyond its rated maximum operating deflection of 37.5 percent of free length, as overcompression accelerates fatigue and can cause premature failure. Inspect the guide rod and pocket bore for wear or misalignment before installation, as a loose fit or bent rod will reduce spring service life.