Dayton Lamina 9-1218-21 Die Spring Blue Medium Duty

Product Description

The DAYTON LAMINA 9-1218-21 is a medium-duty die spring designed for use in stamping dies, punch presses, and tooling fixtures. Built from chromium-vanadium steel with a D-shaped wire profile, it delivers consistent, repeatable force through press cycles. The spring features a 0.75 inch hole diameter and a 0.375 inch rod diameter, with a free length of 4.5 inches. Maximum deflection load reaches 158 pounds at 1.7 inches of travel, with a travel-to-solid dimension of 1.88 inches. The blue color coding indicates medium-duty load classification per ISO 10243. This spring is installed and maintained by tool-and-die technicians, machine builders, and maintenance mechanics working on metal forming equipment.

The 9-1218-21 is suited for medium-cycle tooling applications in automotive, metal fabrication, and industrial press environments. Its chromium-vanadium steel construction withstands the repetitive compression demands of die sets and stripper plates. The ISO 10243 color coding makes it straightforward to identify and source replacements during tooling changeouts. It also meets NAAMS standards, making it a direct fit for automotive die applications where standardized components are required.

Key Features

• Chromium-vanadium steel construction for fatigue resistance under cyclic loading
• D-shaped wire profile for positive rod alignment and reduced lateral movement
• 158 pound maximum deflection load at 1.7 inches of travel
• 37.5 percent maximum operating deflection rating
• Blue color coding per ISO 10243 medium-duty classification
• Meets ISO 9001:2015 and NAAMS standards for tooling interchangeability

Compatibility

Designed as an OEM-style replacement for medium-duty die spring applications in stamping and punch press tooling conforming to ISO 10243 and NAAMS dimensional standards.

Installation Notes

Die spring installation and replacement should be performed by qualified tool-and-die technicians or maintenance mechanics with the press locked out and de-energized per OSHA lockout/tagout procedures. Inspect the rod diameter and hole diameter clearances before installation to confirm proper fit and prevent spring buckling under load. Never compress a die spring beyond its rated maximum operating deflection percentage, as exceeding this limit accelerates fatigue failure. Replace springs in matched sets when possible to maintain balanced load distribution across the die set.