
Case Hardened vs. Through Hardened:
Case hardening is the process of hardening just the surface of the part, also commonly known as carburizing. In the case hardening process, the low carbon component is placed in a furnace which contains a carefully controlled carbon atmosphere. It remains there for a period of time so the carbon soaks into the parts surfaces to a predetermined depth. When the part is heat-treated, the high carbon surface layer becomes hard while the low carbon core remains comparatively soft.
Through Hardening is done where the iron mix contains a certain amount of carbon. Carbon dissolves in molten iron just as sugar would dissolve in coffee. In through hardening steel, there is a high level of carbon added to the iron mix. When the component is heat treated, it becomes hard all the way through from the surface to the core. This is why the term "through hardened" is used.
The Verdict:
Through hardened steel is a lot more brittle and can fracture under impact or shock loads while the case hardened steel has a softer core which drastically reduces the possibility of a fracture or breakage.
WHX82 Chain Dimensions

- Chain Size: WHX82
- Pitch (P): 3.075"
- Tensile Strength: 36,000 LBS
- Weight: 4.70 LBS/ FT
- Bushing Diameter (D): 1.00"
- Inside Width (L): 1.13"
- Sidebar Thickness (T): 0.25"
- Sidebar Height (H): 1.25"
- Pin Diameter (N): 0.56"
- Bearing Length (B): 2.25"
- Overall Width Cottered (W): 3.38"
Feature
- Extremely Durable and High Strength
- Case Hardened Pins
- Manufactured To American Standards
- Typically Supplied as Cottered Construction
- Heat-Treated Barrels and Side Bars
- Chain Size: WHX82
- Pitch (P): 3.075"
- Tensile Strength: 36,000 LBS
- Weight: 4.70 LBS/ FT
- Bushing Diameter (D): 1.00"
- Inside Width (L): 1.13"
- Sidebar Thickness (T): 0.25"
- Sidebar Height (H): 1.25"
- Pin Diameter (N): 0.56"
- Bearing Length (B): 2.25"
- Overall Width Cottered (W): 3.38"