Nelson Heat Treating Co., Inc.

Case Hardened Fasteners, Bolts & Screws for the Construction & Automotive Industries

(Click on thumbnail to enlarge)

Fasteners, Bolts, Screws
Fasteners, Bolts, Screws


At Nelson Heat Treating Co., Inc. we have developed innovative methods for heat treating fasteners, which is a very important aspect of their manufacture. The challenge is to achieve reliable and consistent results on small parts, which we often process in large volumes. Because of our expertise in providing quality work at very reasonable rates, there are almost always fasteners, bolts, or screws in production at our shop at any given time.

Since they are typically manufactured from mild steels, we utilize a case hardening process for fastener products because mild steels are not normally hardenable due to the low carbon content. Our case hardening process involves diffusing carbon, nitrogen, or boron into the outer layer of the steel in a high temperature environment. We then heat treat the now chemically-altered surface layer to achieve the desired hardness. The stability of our process allows us to maintain a uniform depth on all surfaces, including features such as delicate threads. The end result is a fastener with improved wear resistance and fatigue strength. In addition to improving the mechanical properties, we preserve the fasteners dimensional integrity, even on micro-sized parts with diameters as small as 0.0009”.

Case hardening is very compatible to mass production, but we can just as easily manage small lots weighing just a few pounds. We have specialized micro hardness testing equipment to verify the mechanical properties of small fastener parts. If you are interested in learning more about case hardening or any of our heat treating methodologies, please contact us today.

Fasteners, Bolts & Screws Project Highlights

Project Name & Description
Fasteners, Bolts, Screws
Capabilities Applied/Processes
Heat Treatment
  • Case Hardening
Equipment Used to Manufacture Part
Dow Integral Quench
Overall Part Dimensions
Min Diameter: 0.00090"
Max Length: 4 ½"
Material Used
1006 to 1022 Carbon Steel
Industry for Use
Construction and Automotive
In Process Testing/Inspection Performed
Rockwell Hardness Testing
Tukon Micro Hardness Tester
1 lbs. to 10,000lbs
Delivery Location
Standards Met
Customer Specification

View Project Gallery