Bolts for mounting lawn mower blades


Old 03-06-09, 06:45 PM
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Join Date: Jul 2003
Location: Montevallo, Alabama
Posts: 590
Bolts for mounting lawn mower blades

Is there a special hardness for lawn mower blade bolts? The bolts I'm using are 3/8" X 24.
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Old 03-06-09, 06:53 PM
Join Date: Mar 2009
Location: British Columbia
Posts: 111
A grade 5 bolt is fine, if the key shears the bolt can give. A grade 8 is overkill and dangerous, you don't want it to break and have the blade exit at high speed. You really don't.
Old 03-07-09, 12:17 PM
30yearTech's Avatar
Join Date: Oct 2006
Location: Central Texas
Posts: 1,176
All the manufacturers I am familiar with spec grade 5 or higher bolts for mounting mower blades, except mowers with blade brake clutches where a lower grade is acceptable. There is absolutely no problem or risk with using a higher grade (8) bolt for mounting the blade.

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