8TEN LawnRAZOR Mower Blade Set for Craftsman John Deere 54 inch Deck GX21380 GY20679 GY20684 GY20686 (Medium Lift)

What It Is

This is a set of three medium-lift mower blades designed to replace OEM blades on 54-inch cutting decks for Craftsman and John Deere lawn tractors. They improve grass clipping lift and discharge, making them suitable for regular residential mowing on flat to moderately uneven terrain.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 54 inches—these blades will not fit smaller or larger decks. Check your mower model against OEM part numbers GX21380, GY20679, GY20684, or GY20686; these 8TEN blades are direct aftermarket replacements for those. Measure your blade length (should be ~18.5 inches) and center hole diameter (typically 7/8-inch) to ensure fit. This set works with most Craftsman and John Deere tractors from the 2000s onward that use those OEM numbers, but always verify your specific model’s compatibility list.

Key Things to Know

• Quality: Made from hardened steel with a protective coating; users report they stay sharp longer than some budget blades, but may need balancing out of the box.
• Installation: Moderate difficulty—requires a socket wrench and possibly a blade removal tool. Torque to manufacturer specs (usually 70–90 ft-lbs). Wear gloves; edges are sharp.
• Common gotcha: These are medium-lift blades, so they won’t provide the aggressive suction of high-lift blades for thick, wet grass. They’re best for dry, average-height lawns.
• Set includes: Three blades and three alignment washers; no hardware (bolts) included, so reuse your originals if they’re in good shape.

Should You Buy It

If you own a 54-inch Craftsman or John Deere mower and need a reliable, affordable blade set for routine residential mowing, this is a solid choice. It’s not ideal for commercial use or heavy-duty mulching, but it offers good value for the price and consistent performance on typical lawns.