20.75" - 21" Blades for Exmark Mowers

These Stens 20.75 inch - 21 inch Replacement Blades are heat treated for durability and is for Exmark Mowers.

Stens 302-720 Silver Streak Toothed Blade.

Stens 302-720 Silver Streak Toothed Blade.

  • Hi-Lift Toothed Blade
    (302-720)
    USD $28.04
  • Mower Blade
    (345-203)
    USD $19.36
  • Toro Replacement Blade 21"
    (345-397)
    USD $21.21
  • Low-Lift Blade
    (345-429)
    USD $18.39
  • High Lift Blade
    (355-177)
    USD $18.42
  • Mulching Blade
    (355-185)
    USD $19.53
    • Buy 2 for USD $17.59 each and save 10%
    • Buy 3 for USD $16.61 each and save 15%

Details

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

Part # Replaces Exmark OEM Blade Type Length Center
Hole
Outer
Hole
Center/
Center
Width Thickness Fits/Notes
302-720 103-8244 / 103-8396 / 103-8396-S /
103-9629 / 103-9629-S / 109-6463 /
109-6463-S / 109-9393-S / 116-5499-S /
116-5499-S
Toothed
Silver Streak
20 3/4" 15/16" none none 3" 0.203" Requires 3 for 60" decks
345-203 1-42-1000 / 107-4276-03 Hi-Lift 20 7/8" 7/16" 3/8" 2 7/16" 2 7/8" 0.134" 21" Recycler w/out
blade saddle
345-397 107-4276 / 107-4276-03 / 42-1000 /
42-1000-03
Hi-Lift 21" 7/16" 3/8" 2 7/16" 2 7/8" 0.134" 21" rear baggers
345-429 108-3762-03P / 108-3762-S Rolled
Air-Lift
20 7/8" 7/16" 3/8" 2 1/2" 2 1/4" 0.149"
355-177 103-8244 / 103-8244-S / 103-8396 /
103-8396-S / 103-9269-S / 103-9629 /
109-6463 / 109-6463-S / 109-9393-S /
116-5499-S
Hi-Lift 20 3/4" 15/16" none none 3" 0.203" Lazer Z Triton deck;
Requires 3 for 60" deck
355-185 103-8107-S / 103-8107 / 109-5396-S Mulching 20 3/4" 15/16" none none 3" 0.203" Lazer Z Triton deck;
Requires 3 for 60" deck

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