133-8182-03 Toothed Mulching Blades 21 Inch Fit for Toro Recycler Lawn Boy Ex Mark Walk Behind Mower Replace 89914P 108-0954-03

What It Is

This is a set of OEM Toro toothed mulching blades, 21 inches long, designed for Toro Recycler, Lawn Boy, and Ex Mark walk-behind mowers. They replace OEM part numbers 89914P and 108-0954-03, and are meant for mulching grass clippings into fine particles that decompose quickly.

Fitment & Compatibility

Before buying, check three things: deck size must be 21 inches (blade length is measured end to end, not cutting path). Center hole is 7-point star (common on Toro Recycler models). OEM cross-reference – these replace 89914P and 108-0954-03, so confirm your current blade number matches. Models include Toro Recycler (e.g., 20332, 20333, 20339, 20340, 20353, 20370, 20371, 20378, 20379, 20380, 20381, 20382, 20384, 20385, 20386, 20387, 20388, 20389, 20390, 20391, 20392, 20393, 20394, 20395, 20396, 20397, 20398, 20399), Lawn Boy (e.g., 10301, 10302, 10303, 10304, 10305, 10306, 10307, 10308, 10309, 10310, 10311, 10312, 10313, 10314, 10315, 10316, 10317, 10318, 10319, 10320, 10321, 10322, 10323, 10324, 10325, 10326, 10327, 10328, 10329, 10330, 10331, 10332, 10333, 10334, 10335, 10336, 10337, 10338, 10339, 10340, 10341, 10342, 10343, 10344, 10345, 10346, 10347, 10348, 10349, 10350), and Ex Mark walk-behinds with 21-inch decks. Not compatible with most other brands (MTD, Craftsman, John Deere) without adapter.

Key Things to Know

• Mulching vs. bagging – These are toothed blades; they chop clippings finer than standard blades but may not lift as well for bagging. Best for leaving clippings on the lawn.
• Installation difficulty – Easy, but you’ll need a torque wrench (tighten to 55-70 ft-lbs). Use a blade removal tool to hold the blade; never use an impact driver on the bolt.
• Common gotcha – These blades are thicker than some aftermarket options, so check that your blade adapter (often a plastic disc) isn’t worn. A worn adapter can cause blade wobble.
• Balance – Always balance the blades after installation. Unbalanced blades vibrate, wear spindle bearings, and cut poorly. Use a simple blade bal