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L-Cut: Counterclockwise rotating blade; cutting-edge is on opposite side of blade.
.030" 30˚ All OREGON® Blades are 30/30
Air Lift Side View Thickness Offset End View
BLADE ARBOR HOLE TYPES
5 or 7 Point Star Center holes may be 5 or 7 point star shaped.
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
5-point Star
7-point Star
Square or Rectangular 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.
If your blade is secured with a large flange nut then you would use the 5/8" star or “Y” blade
Bow-tie Rectangular Bow-tie / 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.
6-point Star
“Y” center hole
6-point star “Y” center hole OEP Blades - Overview 273