Coulter blades are the disc blades' quieter cousin. They mount on no-till planters, drills, and vertical tillage rigs — cutting a slot for the seed unit instead of turning over soil. Four common profiles cover most of the field.
Smooth coulter
Plain edge, no waves. Slices a clean vertical slot through residue and soil. Common on classic no-till planters — matches the pattern many John Deere and Case IH planters shipped with from the factory.
Best for: firm ground, moderate residue, planters where the row unit does the seedbed prep.
Wavy coulter
Broad, gentle waves around the edge. Cuts and lifts a wider band of soil than smooth, which gives the seed row a slight tilth boost. Not as aggressive as ripple.
Best for: firm ground with light residue where you want a bit of extra loose soil in the seed row.
Ripple coulter
Tight, sharp corrugations. More aggressive than wavy — fluffs a narrow band of soil ahead of the seed unit and handles more residue.
Best for: heavier residue, cool soils where you want a small tilth zone to warm faster.
Turbo coulter
Deeply-fluted, aggressive residue cutter. Sometimes called "13-wave" or "25-wave" depending on flute count. Chews residue in high-trash conditions where a smooth or wavy would skate.
Best for: vertical tillage rigs (Sunflower 6631, Great Plains Turbo-Till, Case IH TigerMate), heavy corn stalks, or first pass after CRP.
Wave count matters
You'll see coulters spec'd by wave count — 8-wave, 13-wave, 25-wave. More waves = smaller waves = more aggressive residue cutting. Match to your existing gang so all coulters run the same pattern.
Bolt pattern matters more
Coulters mount via bolt holes, not axles. Common bolt patterns:
- 4-hole — most Case IH, Krause, and older John Deere
- 5-hole — modern John Deere and Kinze planters
- 6-hole — some Yetter and Great Plains configurations
Bring the pattern (hole count + bolt-circle diameter) when you call — that's more important than the machine model.
Shop coulters
Browse our coulter blade collection. Filtered by diameter and pattern to make matching fast.