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Model # 89963P

Internet # 100671101

Store SKU # 183958

20 in. Replacement Blade For Mowers

This item has been discontinued.
The Home Depot no longer carries this specific product.




Model # 89963P

Internet # 100671101

Store SKU # 183958

Store SO SKU # 183958

The Lawn-Boy 20 in. Replacement Blade For Lawn-Boy Mowers keeps your lawn mower in peak performance. The blade is designed for a high-quality cut and durability. The tri-cut steel blade cuts your lawn finer for easier mulching and bagging.

  • High-quality sharp replacement blades for a superior cut
  • Fits models 10640, 10641, 10642, 10643, 10644, 10645, 10646, 10647, 10648, 10649, 10650 and 10658
  • Tri-cut steel blade
  • Vacuum suction for superior bagging
  • Durable
  • Easy to replace


Assembled Depth (in.) 
20 in 
Assembled Height (in.) 
1.12 in 
Assembled Width (in.) 
2.437 in 
Blade Length (In.) 
20 in 
Double sided 
Fits brands 
Fits models 
10640, 10641, 10642, 10643, 10644, 10645, 10646, 10647, 10648, 10649, 10650, 10658 
Part Type 
Mower Blade 
Warranty / Certifications
Manufacturer Warranty 


Rated 4.8 out of 5 by 10 reviewers.
Rated 5.0 out of 5.0 by Lawn Boy 20" Replacement Blades Very Quick shipment Blades MULCH just as good as the orignials April 30, 2011
Rated 3.0 out of 5.0 by Arkansas to Nebraska Must have worked OK, no complains from grandson in Nebraska. December 9, 2014
Rated 5.0 out of 5.0 by Very good product. I had been using my mower for last 4 years, and just like an average user, I never sharpened the blade and did anything to take care of it. This year I thought I'd take a look at it to see if I can sharpen it myself or take it in to get it sharpened, but when I saw this I just eneded up replacing the blade all together. It took a total of 2 minutes to do the job. Just unscrew the bolt, take the old one out and put the new one in and screw it back in. Its that simple. If you have a bolt that's rusted it might be a different story though :). Anywho, make sure you unplug the spark plug before you work on it. Also, I did this while I was chaning engine oil, so I took the old oil out, took the blade out and put the new one in, stand it up and put new oil in and then gas and BAM! started right up. Much quicker and simpler than trying to find a place to sharpen the blade or if you do it yourself, then having to worry about about balancing the blade etc. ....well worth the money. April 21, 2014
Rated 5.0 out of 5.0 by A Sharp Bargain I flipped the mower on it's side, wedged a 2 X 4 between the old blade and the undercarriage and disconnected the spark plug. I used a large adjustable wrench and spun the old blade bolt out (it was really tight). I paid attention to the way the blade and spacers were facing and everything was back together in about 1 minute. The new blade looks great and cuts the grass without damaging it. May 7, 2013
Rated 5.0 out of 5.0 by Just like the original! It was a very good price, too! The blade costs about the same as two sharpenings. May 22, 2012
Rated 5.0 out of 5.0 by Perfect fit I actually bought a universal 20" blade, but it did not fit, so I went online and purchased this blade from another Home Depot. We picked it up when it was ready. The ease of all of this was great. August 5, 2014
Rated 5.0 out of 5.0 by LawnBoy 20" Replacement Blade The service of super Quick shipping was greatly appreciated. First make sure you disconnect the spark plug wire, and tie it away from the spark plug with a piece of string. Be very careful taking off the old blade and installing the new blade. I would recommend using a blocking-block to keep the blade from turning, and only using a boxed-end wrench or a ratch & socket. May 10, 2010
Rated 5.0 out of 5.0 by Solid blade, fair price My mower is actually a 21 inch mower so I ended up returning this blade. Blade looked like it was good quality though, same as the one on my Lawn-Boy. July 30, 2013
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