Toro 21199HD partsSerial 407000000–412999999

This is the rental TimeMaster — Toro titles its parts pages "TimeMaster 30in Lawn Mower (Home Depot Rental)" — and the blade is what changes across it. Toro lists the 15.4 Inch Atomic Blade kit, 20120P, for the three ranges up to 406999999. From 407000000 it lists the 15.4 Inch Hi-Lift Replacement Blade Kit, 20122P, and it does so for both of the remaining ranges.

**These are not the same blade under two numbers.** Neither product page carries a "Replaces Product" line in either direction, so Toro states no relationship between them at all. Its own names for them differ in kind rather than revision: KIT-BLADE, TIMEMASTER, 30IN against HI-LIFT REPL BLADE KIT TIMEMASTER.

What the two pages do and do not say is worth setting out, because it is less than you would expect. Both blades are 15.4 inch and both cost the same. The Atomic page adds that it "will help produce a crisp quality cut" and that the kit includes two blades; the Hi-Lift page says neither of those things, and carries only Toro's standard wording. **Nowhere does Toro say what a hi-lift blade does that an atomic one does not**, and we are not going to supply that ourselves. What we can tell you is that Toro changed which blade it lists at this serial, and not that one superseded the other, because Toro does not say that.

The same serial carries a second change that does look like a supersession, and it is worth knowing because it corroborates the boundary rather than because you would buy it here: the engine oil listed alongside goes from 117-0066 to 138-6053 at exactly 407000000, and asking either number's product URL serves 138-6053 above the line "Replaces Product 117-0066". Two changes at one serial, one of them a supersession Toro states.

All five listings Toro publishes for this model have been opened, and the two either side of this boundary are consecutive.

All five of Toro’s parts listings for model 21199HD were opened, following the serial-range selector on the listings themselves, and their accessory lists compared within the part categories this site records. The pages carry further items we hold no record for — engine oils, striping kits and a replacement frame and bag kit — and those move across the ranges too; they are described here and not recorded, because this site holds no category for them. Parts present in one listing and absent from another are recorded as unknown rather than incompatible.

The common mistake: Buying the blade that fits a 21199 because this machine is also a TimeMaster. It is the rental unit, it has its own model number, and past 407000000 Toro lists a different kind of blade for it.