Actuator shaft with enhanced bushing surfaces for an EGR assembly


This actuator shaft for an EGR assembly was being made from a high cost, solid T-800 alloy. The expensive shaft failed from fractures induced in assembly and in-service. A more robust design was needed to resist damage and failure, while still retaining the benefits of the T-800 alloy: specifically high temperature wear and oxidation resistance, as well as low friction, anti-galling properties.


A more robust, durable design was created from a solid, 400 series stainless steel shaft, with HVOF coating of a T-800 alloy applied only in the 2 regions that required the special material properties. These 2 regions mate with high performance bushings.


Successful integration of long-life, heat resistant coating which eliminated the assembly damage problem and provided the required performance in-service at a lower overall cost. The new shaft with coating integrated into the bushing areas provides easy assembly and reliable performance in the demanding service environment.

Value Statement:

Precision Coatings helped improve the product design and continues provide reliable, FULL-SERVICE complete component supply and high volume production of 10,000-80,000 annually.


Product Description Emissions control actuator shaft with high temperature, wear resistant, low friction coating to prevent galling and oxidation.
Capabilities /Processes/Services
  • Design Engineering /Product Development
  • Complete Component Supply
  • HVOF Spray Coating
  • Machining of basic shaft
  • Centerless Grinding
  • High Volume Production
Coating Solution Benefits
  • High Temperature Oxidation Resistance
  • Abrasion Resistance
  • Wear Resistance
  • Anti-Galling
  • Low Friction
Temperature Rating 1300°F
Coating Color Gray/Silver
Estimated Part Weight 20 lbs
Industry for Use Diesel Engine Emissions Control
Quantity 10,000 – 80,000 per year
Delivery Time Ongoing to meet production demand
Standards Met Customer Defined Specifications