Replacement rotary hoe blades for Howard Rotavator machines, available in Standard, Speed, and Long Shank profiles. The correct blade is identified by measuring the A dimension (radius from blade centre to blade tip) and B dimension (blade width at the fitting flange), plus the bolt hole diameter (1/2" or 5/8"). Blades are sold individually and boxed in lots of 20.

1/2" bolt hole blades

• B4001/B4002 - Standard, A=173mm, B=142mm, 8mm thick
• B8001/B8002 - Speed, A=205mm, B=130mm, 7mm thick

5/8" bolt hole blades

• B7001/B7002 - Standard, A=175mm, B=140mm, 8mm thick
• B9001/B9002 - Speed, A=210mm, B=145mm, 8mm thick
• B9003/B9004 - Long Shank, A=195mm, B=137mm, 8mm thick

Fitting bolts

• B2466 - 1 1/2" x 1/2", Grade 8, pack of 10
• B2467 - 1 3/4" x 5/8", Grade 8, pack of 10

Standard blades are general-purpose; Speed blades have a longer radius for higher surface speed at the blade tip, increasing cutting aggressiveness. Long Shank blades give additional depth penetration. Odd numbers are left-hand, even numbers are right-hand - rotary hoes require both in matched pairs. Grade 8 bolts are required for blade fitting.