20" Smooth Disc Harrow Blades 1-1/8" x 1-1/4" Square Dual Punched 9 Gauge 3.5 MM P209118114

What It Is

This is a set of 20-inch smooth disc harrow blades, designed for use in tractor-mounted or pull-behind disc harrows used in soil preparation, tilling, and light landscaping. They are not lawn mower blades; the category is misleading.

Fitment & Compatibility

Before buying, verify these three measurements:

• Diameter: Must be exactly 20 inches (check your existing blade).
• Center hole: Square dual punched, 1-1/8" x 1-1/4". Measure your arbor or gang bolt; a mismatch will prevent mounting.
• Thickness: 9 gauge (3.5 mm). Confirm your disc gang spacing allows this thickness. This is an aftermarket part, not OEM-specific to any brand. It fits most standard 20-inch disc harrows with the correct square hole size. If your harrow uses round holes or different dimensions, this will not work.

Key Things to Know

• Quality: 9 gauge is standard for medium-duty use (light tillage, garden prep). Not for heavy-duty rocky soil—consider thicker 7 gauge for that.
• Installation: Moderate. You’ll need a wrench to remove and reinstall the gang bolt nut. No special tools required, but a torque wrench is recommended to spec (typically 150-200 ft-lbs, check your manual).
• Gotcha: Smooth blades are for finish work or light incorporation. They do not cut through sod or heavy residue like notched blades. If you need aggressive cutting, choose a notched design.
• Quantity: This listing is for a single blade. Check how many your harrow needs before ordering.

Should You Buy It

Buy if you need a replacement for a standard 20-inch smooth disc harrow blade with the exact square hole size and you’re doing light soil prep or seedbed finishing. Skip it if you need notched blades for heavy residue, a different hole size, or multiple blades—order accordingly.