Oregon Tool® - 20-1/2" Lawn Mower Blade

Blade Width - Measure near the center of the blade.
Thickness - Measure near the center of the blade.
Blade Length - Measured diagonally from the corners of the blade
Center Hole Size - Many blades will have a round hole in the center of the blade and you will need to know its diameter. Blade Length 5 or 7 Point Star Center holes may be 5 or 7 point star shaped. 5 point star on blade7 point star on blade 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. Square or Rectangular hole on blade 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 for MTD blades 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. blade spindle with bolt and lock washer. If your blade is secured with a large flange nut then you would use the 5/8" star or 'Y' blade. blade spindle with large flange nut
OffSet - (Sometimes referred to as offset): If you set the blade on a table this is the distance the center of the blade is above the table top (if any) when the cutting edges are flat on the table
Air Lift - Air lift is the distance the lift panel rises above the cutting edge.

Fit Guide
Hustler: 927327, 927343, 927350, 927368, 927376, 927400, 927467, 927616, 927673, 928614CE, 928655CE, 928721, 928721CE, 929125, 929463, 929547, 929570CE, 929588CE, 929851, 929869, 929927, 929935, 929943, 929950, 930024, 930024CE, 930065, 930198, 930206, 930206US, 930214, 930222, 930222US, 930230, 930255, 930263, 930271, 930289, 930297, 930305, 930313, 930503, 930503US, 930511, 930522, 930529, 930529US, 930537, 930537US, 930545, 930560, 930578, 930586, 930594, 930651, 930669, 930677, 930685, 930693, 930701, 930719, 930727, 930875, 930875CE, 930883, 930891, 931006, 931048, 931055, 931055US, 931121US, 931139US, 931287CE, 931295CE, 931303, 931311, 931329, 931345, 931386, 931600CE, 931618CE, 931725, 931741, 931774, 931782, 931881, 931899, 931915, 931923, 931998US, 932004US, 932012, 932020, 932038, 932046, 932053, 932061, 932129, Super Z, Z

Replacement Guide
Bunton-Goodall: PL7441
Dixie Chopper: 30227-60, 30227-60E, 30227-60H, 30227-60T, 30227-60V, 30227-60X, A30227-60N
Dixon: 12421, 12451, 12508, 13368, 13869, 13870, 13921, 13922, 13956, 13957, 13958, 13960, 539119871, 9383
Hustler: 600901, 602771, 602771X, 603992, 603992X, 793794, 793794X, 793794Y, 793935, 793935X, 794214, 794214X, 794230, 794230X, 794230Y, 794685, 794685X
Jacobsen: 30227-60X
Stens: 315-511
Sunbelt: B1HS1005