At Excel Spring & Stamping we specialize in high volume custom metal stampings. The project highlighted here represents a production run of over 5,000,000 to date. This stamped component was designed for use as an intake valve on an air compressor. These valves were stamped from Sandvik 7C27Mo2, a hardened and tempered martensitic stainless steel, which is alloyed with molybdenum.

The finished valve measures .483″ (±.003″) wide and .0080″( ±.0004″) thick. After the flapper valves were stamped, they were treated in our proprietary flapper valve finishing process. This finish gives the valve excellent fatigue strength, while maintaining the required flatness. Complete flatness of the flapper valve is critical to achieving compressor performance and service life.

Finally, the parts were stacked on a custom fixture, and the stacks carefully packed in cartons. At Excel Spring & Stamping, we have become well-known in the compressor industry for our high quality flapper valve stamping and finishing. For more information about this custom metal stamping project, see the table below, or contact us directly.


Stainless Steel Stamping Project Highlights

Product Name

Flapper Valve UMC Intake

Product Description

This stamped component is a flapper valve for an air compressor.

Capabilities Applied/Processes


Special Flapper Valve Finishing
Flatness Inspection
Special Packaging for Part Protection

Equipment Used to Manufacture Part

35 Ton Punch Press

Overall Part Dimensions

Width: 0.483″ ± 0.003
Thickness: 0.0080″ ± 0.0004

Tightest Tolerances

± 0.0004″
Angular: ± 0.5°

Material Used

Sandvik 7C27Mo2 Flapper Valve Steel (Strip Steel)

  • Hardened and Tempered Martensitic Stainless Steel Alloyed with Molyb denum
Material Finish
  • Special Flapper Valve Finishing
In process testing/inspection performed

Dimensional Inspection – 100% Flatness
Edge Radius

Industry for Use

Air Compressor

Delivery Location


Standards Met

Customer Specifications, 2D CAD Drawing