20" - 21" Blades for Gravely Mowers

These Stens 20 - 20 1/2 inch Replacement Blades are for Gravely Mowers.

320-402 Blade.

320-402 Blade.

  • Toothed Blade
    (302-620)
    USD $21.33
    • Buy 2 for USD $19.21 each and save 10%
    • Buy 3 for USD $18.14 each and save 15%
  • Hi-Lift Toothed Blade
    (302-820)
    USD $30.81
  • Blade
    (305-730)
    USD $19.26
    • Buy 2 for USD $17.34 each and save 10%
    • Buy 3 for USD $16.38 each and save 15%
  • Hi-Lift Blade
    (315-792)
    USD $17.61

    Out of stock

  • Blade
    (320-402)
    USD $37.68
  • Blade
    (320-564)
    USD $14.20
  • Blade
    (340-117)
    USD $18.43
    • Buy 2 for USD $16.60 each and save 10%
    • Buy 3 for USD $15.67 each and save 15%
  • Toro Blade
    (355-036)
    USD $14.54
    • Buy 2 for USD $13.09 each and save 10%
    • Buy 3 for USD $12.37 each and save 15%
  • Heavy-Duty Blade
    (355-331)
    USD $17.68

Details

Rittenhouse carries the Stens Line of replacement blades for your Gravley Mowers. The table below will help determine which one you may need.

They are precision balanced and heat treated for durability.

We carry different types of blades to choose from including toothed blades, mulching blades and rolled air-lift blades.

Toothed and mulching blades achieve smaller clippings for quick decomposition and a more manicured look.

A rolled air-lift blade lifts grass blades up for a cleaner cut and propels grass clippings up to be sucked into a mower bag easily.

The Silver Streak HiLift Toothed blade are made 25% thicker than most other toothed blades and has 40% higher lift. They have more surface areas to cut grass and leaves and have more sharpening area resulting in longer blade life.

To measure your lawnmower blade:

  • Measure the blade diagonally from cutting tip to cutting tip. For mulching blades measure on the back to ensure straight lines.
  • Measure the width at the widest part of the blade.
  • Measure the center hole.
  • Measure the center to center distance between the outer holes.
  • Refer to our chart below to choose your blade accordingly.

Part # Replaces Gravely OEM Blade Type Length Center
Hole
Width Thickness Fits/Notes
302-620 025124 / 046999 / 08781800 /
08781851 / 08898900 / 08899100 /
089046 / 08904651 / 08979600 /
08979651 / 090812 / 09081200 /
46999 / 48864 / 89796 /
8979651
Toothed
Silver Streak
20 1/2" 5/8" 2 1/2" 0.203" Requires 3 for 60" deck
302-820 025124 / 046999 / 08781800 /
08781851 / 08898900 / 08899100 /
089046 / 08904651 / 08979600 /
08979651 / 090812 / 09081200 /
46999 / 48864 / 89796 /
8979651
Toothed
Silver Streak
20 1/2" 5/8" 3" 0.250" Requires 3 for 60" deck
305-730 0113700 / 01137000 / 01137051 /
01182400 / 0137051
Medium-Lift 20 1/2" 3/8" 2 3/4" 0.134" Pro 21SCH
315-792 025124 / 03253900 / 046999 /
048864 / 08781800 / 08781851 /
08898900 / 089046 / 08904651 /
08979600 / 08979651 / 090812 /
09081200 / 46999 / 48864 /
89796 / 8979651
Hi-Lift 20 1/2" 5/8" 2 1/2" 0.250" Pro 200 and 300 series;
Requires 3 for 60" deck
320-402 09246600 Hi-Lift 20 1/2" 5/8" 2 1/2" 0.250" 260Z;
Requires 3 for 60" deck
Features tungsten injected blade tip
320-564 025124 / 046999 / 08781800 /
08781851 / 08899000 / 089046 /
08904600 / 08904651 / 08979600 /
25124 / 46999 / 48864 / 89796 /
8979651
Hi-Lift 20 1/2" 5/8" 2" 0.250" Requires 2 for 40" deck, 3 for 60" deck
340-117 GDU10232 Notched
Air-Lift
21" 5/8" 2 1/2" 0.203" Requires 3 for 61" deck
355-036 025124 / 046999 / 08781800 /
08781851 / 08899100 / 089046 /
08904651 / 08979600 / 090812 /
09081200 / 46999 / 48864,
89796 / 8979651
Notched
Hi-Lift
20 1/2" 5/8" 2 1/2" 0.203" Requires 3 for 60" deck
355-331 025124 / 046999 / 08781800 /
08781851 / 08899100 / 089046 /
08904651 / 08979600 / 090812 /
09081200 / 46999 / 48864 /
89796 / 8979651
Notched
Hi-Lift
20 1/2" 5/8" 2 1/2" 0.250" Requires 3 for 60" deck

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