Quick Answer: Robot mower blades are brand-locked consumables, and the replacement interval is not quoted in the same unit by any two manufacturers. Husqvarna says Automower main-disc blades last 3–6 weeks; Segway says replace Navimow blades every 80 working hours; Mammotion says flip Luba/Yuka blades at ~50 hours and replace at ~150; Worx says flip or change Landroid blades about monthly on a daily cutting schedule. Blade count per change is three for Husqvarna, Worx and Navimow — but eight for Mammotion Luba and Yuka, which run two cutting discs. Always replace the whole set at once and fit new screws with them: Husqvarna warns that reused screws can let blades come loose during operation.
Blades are the only part of a robot mower you will buy more than once, and they are cheap — a genuine 12-blade Worx Landroid kit lists at $34.99 on Worx’s own store. The expensive mistake is not the price of the blades, it is buying the wrong ones, running them too long, or mixing a new blade onto a disc with two worn ones. This guide covers what actually fits, what each manufacturer really says about intervals, and where the OEM-versus-aftermarket line sits.
Robot mower blades, by the numbers
- 3–6 weeks — Husqvarna’s stated main-disc blade life. Husqvarna’s own Automower service guidance puts main cutting-disc blade life at three to six weeks under normal conditions, while the separate EdgeCut disc blades last 9–12 weeks because they only engage during edge-cutting passes. If you own an EdgeCut model, you are maintaining two blade sets on two different clocks.
- 80 working hours — Segway’s Navimow interval. Segway recommends replacing the blades on the Navimow i, X3 and X4 series every 80 working hours, and points owners to the app’s runtime counter rather than a calendar date. For a heavily scheduled mower that can arrive in under a month.
- 50 hours to flip, 150 hours to replace — Mammotion’s Endurance blades. Mammotion’s guidance for its stainless-steel Endurance blades on the Luba and Yuka series is to flip the blades at around 50 hours of use and replace them at around 150. The flip step effectively doubles the service life of a set, and it is the step most owners never perform.
- 12 blades and 12 screws for $34.99 — the Worx Landroid kit. Worx sells the WA0190 kit with twelve 1-inch double-edged blades plus twelve installation screws for $34.99, listed for the WG794, WR140 (Landroid M) and WR150 (Landroid L). Because a Landroid carries only three blades at a time, that single kit covers four full blade changes.
- 8 blades per change — the Mammotion exception. Luba and Yuka mowers use two cutting discs and eight blades, not three, so every service consumes nearly three times as many blades as a Husqvarna or Navimow change. Mammotion and third parties therefore sell them in 24-, 36- and 40-piece packs.
Blade fitment and intervals by brand
| Brand / series | Blades on the mower | Manufacturer interval | Typical kit size | Screws included? |
|---|---|---|---|---|
| Husqvarna Automower (main disc) | 3 pivoting | 3–6 weeks | Multi-blade kits with screws | Yes — and Husqvarna says always fit new ones |
| Husqvarna Automower (EdgeCut disc) | Separate edge blades | 9–12 weeks | Sold separately from main-disc blades | Yes |
| Worx Landroid (WG794 / WR140 / WR150) | 3 double-edged | Flip or change ~monthly if cutting daily | WA0190: 12 blades, $34.99 | Yes — 12 screws |
| Segway Navimow i / X3 / X4 | 3 | Every 80 working hours | Sets of 3, sold in multi-packs | Yes |
| Mammotion Luba / Luba 2 AWD | 8 (two discs) | Flip at ~50 h, replace at ~150 h | 8, 24, 36 or 40-piece | Varies by seller |
| Mammotion Yuka / Yuka mini | 8 | Flip at ~50 h, replace at ~150 h | 24-piece sets common | Varies by seller |
The practical read: if you own a three-blade mower, one 12-blade kit is a season. If you own a Luba or a Yuka, buy the 24-piece set — a single 8-blade set is one change, and you will be back within weeks.
Husqvarna Automower Replacement Blades & Screws
- Husqvarna's official position is unambiguous: always use original Husqvarna blades and screws.
- Fit new screws with every blade change — reused screws can let blades work loose.
- EdgeCut models need a second, separate blade set on a 9–12 week clock.
Blade changes are a ten-minute job you will do several times a season, flat on your back over an upturned mower — start a free Audible trial and put a chapter on while you work through the set.
Worx Landroid WA0190 Blade Kit — 12 Blades + 12 Screws
- Double-edged blades: flip them once before discarding, doubling the set's life.
- Ships with a matching screw for every blade — one blade per screw, per Worx.
- Landroid carries three blades at a time, so 12 blades covers a full season for most lawns.
Mammotion Luba & Yuka Endurance Blades — 24-Piece Set
- Sized for the two-disc Luba and Yuka cutting system — a 24-piece set is three changes, not eight.
- Check the mounting hole: some Luba-compatible sets use a double-hole pattern.
- Buy per generation — Luba 2 AWD, Luba AWD and Yuka listings are not interchangeable by default.
Segway Navimow Replacement Blade Sets
- Segway quotes the interval in working hours, not weeks — read it off the app's runtime counter.
- Same three-blade layout across the i series, X3 and X4; confirm your exact model on the listing.
- Cheap enough to keep two sets on the shelf so a dull disc never delays a mow.
The three rules that matter more than which blades you buy
1. Replace the entire set, every time. Husqvarna explicitly warns against mixing different blade types or combining new and old blades, because it unbalances the cutting disc. A disc spinning with one fresh blade and two worn ones is measurably heavier on one side, and that imbalance is absorbed by the cutting-motor bearing every second the mower runs. Never replace “just the damaged one.”
2. Fit new screws. This is the step almost everyone skips, and it is the one Husqvarna calls out by name: replace the screws each time you change blades, because reusing screws may lead to blades coming loose during operation. Husqvarna also specifies one blade per screw. A blade released at cutting speed is the single genuine safety hazard in robot mowing — and the fix costs cents.
3. Track hours, not weeks. Three of the four biggest brands now define blade life in working hours (Segway’s 80, Mammotion’s 50/150), and every one of these mowers reports runtime in its app. A mower doing a quarter-acre daily accumulates hours three times faster than one running twice a week on the same schedule page, so a calendar reminder will always be wrong for someone.
OEM versus aftermarket: where the line actually is
Third-party blades for Mammotion, Husqvarna and Worx mowers are everywhere, often at a third of the OEM price and in larger packs — 36-piece and 40-piece titanium-coated sets for the Luba and Yuka series are among the best-selling robot-mower parts on Amazon.
The honest assessment: the failure mode people fear (soft steel dulling instantly) is rarely what goes wrong. What goes wrong is fitment and consistency. A blade that is 0.2 mm thicker than spec sits differently against the disc; a set with variable stamping weight vibrates; a screw with a slightly different head fouls the pivot. Those are manufacturing-tolerance problems, not material problems, and they vary by seller rather than by “OEM versus not.”
So: Husqvarna’s guidance to use only original blades and screws is the safe default, and on an $1,899 Automower 415X the OEM premium is trivial insurance. On a Luba burning eight blades per change, the economics genuinely favour a well-reviewed third-party multi-pack — but buy one brand, one pack, and change the complete set at once. Mixing sellers across a disc is the worst of both worlds.
What this guide deliberately leaves out
This is a parts-and-fitment guide. It does not cover the rest of the maintenance routine — cleaning the chassis and disc, battery care, firmware updates, or winter storage — because those run on their own schedules. For the complete seasonal checklist and the running-cost breakdown, see our robot lawn mower maintenance guide.
It also does not rank mowers. If you are still choosing a machine, blade count is a legitimate tiebreaker most buyers never consider: an eight-blade mower costs roughly 2.7× as much per blade change as a three-blade one. Start with our best robot lawn mower rankings, or the brand deep-dives for Husqvarna Automower, Mammotion, Segway Navimow and Worx Landroid. If you are weighing the total cost of ownership rather than the sticker price, our robot lawn mower cost breakdown puts blades in context against the battery and electricity.
The bottom line
Buy blades by your exact model number, buy them in the largest pack that matches your blade count, and change the complete set with fresh screws on the interval your manufacturer actually publishes — 3–6 weeks for a Husqvarna main disc, 80 working hours for a Navimow, ~150 hours for a Mammotion Luba after a flip at 50. Blades are the cheapest part of owning a robot mower and the one with the most direct effect on how the lawn looks. A dull set does not stop the mower; it just quietly gives you a worse lawn and a shorter battery runtime until someone notices the grass tips have gone white.