When your disc blades start looking more like worn coins than cutting tools, it’s time for replacements that’ll actually slice through soil and residue instead of just pushing everything around. This 18-inch smooth disc blade from Osmundson brings back that sharp cutting action your harrow needs to break up compacted ground and size residue properly for the next crop.
What You’re Getting
- 18-inch diameter with smooth edge for clean soil penetration and finishing work
- Boron 15B26 steel construction heat-treated to 46-52 Rockwell hardness for long blade life
- Standard 1.63-inch concavity provides good soil mixing without excessive draft
- Combo hole design fits both 1-inch square and 1-1/8-inch square axles on most disc harrows
- 9-gauge thickness (3.5mm) offers the right balance of durability and soil flow
Built for Real Farm Work
This blade fits a wide range of disc harrows used for primary and secondary tillage work. Whether you’re breaking up corn ground after harvest, working down wheat stubble, or preparing a smooth seedbed for spring planting, smooth blades like this one create the fine, uniform finish that notched blades can’t match. They’re especially effective in lighter soils and minimal residue conditions.
Made to Last
Osmundson builds these blades from high-carbon boron steel that’s heat-treated for maximum toughness and edge retention. The material cuts clean through roots and trash while resisting the kind of edge chipping and dulling that cheaper blades suffer from. You’ll get several seasons of good cutting action before needing replacements.
Good to Know
The combo hole design means this blade works on most standard disc harrows without modifications. When replacing blades, check your axle wear too—worn square axles let blades wobble and wear prematurely. Many operators replace smooth and notched blades in sets, running notched on front gangs for cutting and smooth on rear for finishing. Store your harrow with blade edges coated in used oil to prevent rust pitting.
