Oregon Tool® - 21" 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
Bobcat: 226ES, 32038, 442212, 442233, 442237, 622100, 622102, 636400, 636406, 636406A, 642201, 642203, 642204, 642206, 642207, 642212A, 642219E, 642219F, 642221, 642222, 642223, 642223A, 642225, 642226, 642227, 642228, 642228A, 642230, 642230A, 642233, 642233A, 642233B, 642233E, 642233F, 642237A, 642237E, 642237F, 642238A, 642241B, 642241D, 642241E, 642241F, 642243E, 642245E, 642245F, 642246E, 642246F, 642249E, 642249F, 642293, 642293E, 642311F, 642404F, 655202, 656102, 736406A, 742212A, 742223A, 742223B, 742228A, 742233A, 742233B, 742241C, 922100, 922101, 922102, 934300, 935300, 936300, 936400, 936406, 936406A, 942203, 942204, 942206, 942207, 942208, 942209, 942212A, 942219E, 942219F, 942221, 942222, 942223, 942223A, 942224, 942224A, 942225, 942226, 942227, 942228, 942228A, 942230, 942230A, 942233A, 942233D, 942233E, 942233F, 942236, 942236D, 942237A, 942237D, 942237E, 942237F, 942238A, 942241A, 942241C, 942241D, 942241E, 942241F, 942243D, 942243E, 942245E, 942245F, 942246E, 942246F, 942249E, 942249F, 942252F, 942253F, 942254F, 942255F, 942256F, 942257F, 942293, 942293E, 942302F, 942302G, 942302H, 942311F, 942311G, 942311H, 942314G, 942316G, 942316H, 942316J, 942404F, 942404G, 942405F, 942405G, 942407H, 942407J, 942409J, 942502G, 942502J, 942504G, 942504J, 942505G, 942507G, 942507J, 942509G, 942509J, 942510G, 942510J, 942512G, 942512J, 942514G, 942514J, 942515G, 942515J, 942521H, 942521J, 942523H, 942523J, 942526J, 942533, 942602, 942612, 942704J, 942707J, 954800, 955201, 955202, 955217, 956017, 956101, 956102, FM-48S, FM-61S, FM-74S, FR691V, Fastcut, M21-4BZ, M21-4BZ2C, M21-4BZIC, M21-4SPZ, M21-4SPZIC, M21-5BZIC, Predator Pro, Procut, T-1861, T-1861K, XM3652, XM3654, XM4852, XM4854, XM4883, XM5482, XM5483, XM6180, XM6181, XSPB511, XT3100, ZT200, ZT219, ZT220, ZT223, ZT225, ZT226, ZT227, ZT228, ZT231
Encore: Prowler
Jacobsen: 2260ES, JZT2230, JZT2250, Procut Z, ZT231
John Deere: 661R QuikTrak
Spartan: RT, SRT
Steiner: ZTM 200 Series
Wright Stander: Sport X, Stander X

Replacement Guide
Bobcat: 112111-03, 112243-03, 2722453-03, 2722543-03, 42180B, 72039B, WM142180B
Encore: 823006
Jacobsen: 112111-03, 112243-03
John Deere: TCU34281, TCU35394
Laser: 91162
Mowmore: BC21B
PLP: 114-160
Prime Line: 7-04521
Rotary: 3402
Spartan: 438-0002-00
Steiner: 112111-03
Stens: 310-086
Sunbelt: B1BC1206
Wright Stander: 71440007, 71440010