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Blade Arbor Hole Types
5 OR 7-POINT STAR Center holes may be 5 or 7-point star shaped.
SQUARE OR RECTANGLE The MTD built blades on many walk-behind lawn mowers have a “bow-tie” hole. In this case the Oregon replacement blade will have a rectangular center hole which will fit on the bow-tie pattern on the blade adapter.
5-POINT STAR
7-POINT STAR
BOW TIE
BOW TIE RECTANGULAR
RECTANGULAR
MTD BLADES The MTD built blades (Bolens, Cub Cadet, Troy-Bilt, White, Yard Machine and Yardman) may have a 6-point star. Oregon replacement blades will have a “Y” shaped center hole which will fit exactly on the 6-point star on the blade spindle.
The two sizes of the 6-point star:
If your blade spindle has a bolt and lock washer that holds the blade to the machine, you would use the 11/16" star or “Y” blade
6-POINT STAR
Y-CENTER HOLE
If your blade is secured with a large flange nut, then you would use the 5/8" star or “Y” blade.
6-POINT STAR "Y"-CENTER HOLE
DIAMOND Compatible with S-shape center hole
2025
TechnicalServices@OregonProducts.com 1.800.223.5168
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