Description
When your disc blades start looking more like smooth wheels than cutting tools, you know it’s time for replacements that’ll actually do some work. These worn blades just push residue around instead of cutting through it, leaving you with poor seedbed prep and frustrated neighbors wondering why your planter keeps getting hair-pinned with trash. This 20-inch notched disc blade from Osmundson brings aggressive cutting action back to your harrow, turning tough corn stalks and matted residue into properly sized pieces that’ll break down instead of causing you headaches come planting time.
What You’re Getting
- Each notch creates a scissor action that slices through tough stalks other blades just bend over – perfect for heavy residue conditions
- Boron 15B26 steel maintains the perfect hardness range – hard enough at 46-52 Rockwell to hold an edge through acres of tough tillage, but not so brittle it shatters when you clip that hidden field stone
- 9-gauge thickness (3.5mm) provides durability without being too heavy for your disc gang
- 1.88-inch concavity creates good soil flow and residue mixing action
- Single punch hole type fits standard 1-1/8 inch square axles – direct replacement for most disc harrows
Built for Real Farm Work
Your disc harrow needs to do more than just roll over crop residue – it needs to cut, size, and mix that material into the soil profile. These notched blades from Osmundson attack residue aggressively, making quick work of corn stalks, bean stubble, and cover crops. Whether you’re running a tandem disc, offset disc, or vertical till machine, this blade’s 20-inch diameter hits the sweet spot for most medium-duty tillage operations.
Made to Last
Osmundson doesn’t mess around with blade materials. This Boron 15B26 steel maintains the perfect hardness range and no fancy coatings here – just quality steel that works. The material handles temperature swings, moisture, and the constant abuse of rocks and debris without losing its edge prematurely. Most blades are shot when they’ve lost 3-4 inches, so at 20 inches starting diameter, you’ve got good life ahead if maintained properly.
Good to Know
When replacing blades, never mix worn and new on the same gang – the diameter difference creates uneven cutting that leaves mohawk strips. Field-proven wisdom: Notched blades excel in heavy residue but can be too aggressive in light soils or minimal trash conditions. Many operators run notched blades on front gangs for cutting, smooth on rear for finishing. When storing disc harrows, coat blade edges with used oil to prevent rust pitting that ruins cutting ability.
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