The best scarifier blades, compared.
Top pick: Bluemars BM-GP1003 Best value: OTOTEC HO195W – Score 86 from 4.3 and 43 reviews at about £15.99, 45 springs for named Parkside models. Updated October 2026.
A scarifier blade is the part that combs moss and thatch from a lawn. In the UK you buy one when the old piece is finished, or when you want one or two passes a year without a second machine. The spare is a knife roller for a named scarifier, a pack of spring tines for a fan drum, or a flat bar bolted under a rotary mower in place of the mowing blade. Judge it by working width, the centre hole or shaft, the side holes or pulley bore, and whether it is a knife or a spring. A bar only nearly the right length hits the deck. A spring that is too long snaps. Springs comb moss and stay off the soil. Knives cut shallow slits for thatch. Check the carton for adaptors, bearings and the stated spring count. Isolate the host before you fit it. The first pass stays at the highest setting. Depth sits on the host, not on the spare. What to measure is in the [scarifier blade buying guide](/hub/lawn-and-garden-equipment/scarifier-blade/sub/scarifier-blade-buying-guide).
A scarifier blade is the part that combs moss and thatch from a lawn. In the UK you buy one when the old piece is finished, or when you want one or two passes a year without a second machine.
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Personal buying guide
Question 1 of 2
What are you fitting it to?
The Bluemars listing is a 2.3 kg metal roller with steel tines at £39.99, named only for the BM-GP1003 2-in-1 electric scarifier, which the title describes as 2000 W. The amazon.co.uk line is 5.0 from five ratings, and the two reviews in the file are positive and do not describe a fault. That sample is too small to lead the category, so the comparison score is held at 74 rather than left at a perfect 100. Working width, blade count and centre bore are not stated. The bullets say it fits at the end of the bearing and is simple to replace, and they do not say the job is tool-free or prove that both a knife drum and an aerator drum are in the box. If your chassis is that Bluemars model and the old roller is finished, this is the only listing here that names it. On any other machine the five stars do not travel.
Pros
Cons
Best for: You already own a Bluemars BM-GP1003 and the roller is worn or missing.
Less suitable: Any other host, or a choice made from the 5.0 line alone.
Specifications
Common questions
Which machine is this roller for?
The listing says the Bluemars BM-GP1003 2-in-1 aerator scarifier, described as 2000 W in the title. It is not a rotary-mower bar.
How does the listing say you fit it?
The bullets say it is simple to replace and fits in at the end of the bearing. They do not say the job is tool-free.
What do the reviews say is wrong with it?
The two reviews in the raw are positive and do not describe a fault. The listing shows 5.0 out of 5 from 5 ratings.
The Einhell 3420021 is an 18-blade alloy-steel roller at £37.95 and 2.7 kg, listed for the petrol scarifier GC-SC 2240 P with a 40 cm working width and a ball-bearing drum. Across 187 amazon.co.uk ratings the line is 4.5, the largest count here that belongs to one named machine rather than a shared Oregon set. The listing says you change it with a hexagonal socket wrench and that you should wear gloves, and reviews that matched the shaft cite about 15 minutes. The same reviews report a pulley bore about 1 mm small, a shaft or bearing seat that differs, a shallow keyway, or a roller about 1.5 cm short, even when the type number looked right. Einhell’s accessory page calls this roller stainless steel while the amazon listing says alloy steel, so the metal word is not settled. The carton is given as 51 × 20 × 20 cm and the listed area as up to 1,200 m². It leads this comparison on named-model evidence when the machine really is a GC-SC 2240 P, and you stop if the pulley will not slide on. A 40 cm roller for a different Einhell model is a different part number.
Pros
Cons
Best for: Your scarifier is the Einhell GC-SC 2240 P and the old 40 cm roller is blunt, bent, or gone.
Less suitable: Another Einhell width, a rotary mower, or a Parkside spring drum.
Specifications
Common questions
Which scarifier is this roller for?
The listing says the Einhell petrol scarifier GC-SC 2240 P, with 18 steel blades and a 40 cm working width.
How do you change it?
The listing says you use a hexagonal socket wrench and that you should wear gloves. Reviews that matched the shaft cite about 15 minutes.
Why do some reviews say it does not fit?
Reviews report a pulley bore about 1 mm small, a shaft or bearing seat that differs, a shallow keyway, or a roller about 1.5 cm short, even when the type number matched.
The OTOTEC pack is 45 stainless springs at £15.99 and 170 g, with 1.6 mm wire and a 12 mm coil inner diameter, named for Parkside PLV 1500 A1, B1, C1 and C2 and for PLVA 40-Li A1 and B1. A fan drum usually takes 44, so the count includes one spare. Across 43 amazon.co.uk ratings the line is 4.3. The listing says you loosen the nut and replace the springs without removing the bearings, and that this takes a few minutes. Free length is not printed, and reviews say the springs were too long for a PLV 1500 B1. Bending them shorter means the length was wrong. This is a spring refill, so it will not bolt under a rotary mower and it is not a knife roller. At the bottom of the price band, with a named host and a usable review count, it is the best value in this set when the plate on your machine matches those Parkside models.
Pros
Cons
Best for: You own one of the named Parkside scarifiers and the old springs are bent or missing.
Less suitable: An Einhell knife roller, a mower conversion bar, or a Parkside variant the listing does not name.
Specifications
Common questions
Which scarifiers are named?
Parkside PLV 1500 A1, B1, C1 and C2, plus PLVA 40-Li A1 and B1. This is a spring set, not a mower bar.
What size are the springs?
The listing says wire diameter 1.6 mm and coil inner diameter 12 mm. Free length is not given. Reviews say they were too long for a PLV 1500 B1.
How are they changed?
The listing says you loosen the nut and replace the springs without removing the bearings, and that this takes a few minutes.
The Oregon 690-521-0 is a 51 cm alloy-steel bar at £37.02 and 566 g, sold with fittings, washers and push-on tines for petrol mowers. The amazon.co.uk line is 4.2 from 1,289 ratings, and that review text is the same family set as the 16 in listing, so the count is not a separate trial of this width. Reviews name decks that fitted with the washers, and others that needed grinding or struck the housing. One review reports damage to a Hayter Harrier 41. Oregon’s own page for this 20 in part says it does not fit Honda models, and the amazon listing does not carry that sentence, so “most petrol mowers” is not a Honda yes. Reviews also say the moss does not lift into the grass box the way a mowing blade does. You refit the normal blade or rake afterwards. It is the clearer 51 cm kit here when the deck is that wide and the hub matches the washers.
Pros
Cons
Best for: You have a petrol rotary around 51 cm, the hub matches the washers, and you are ready to rake what the box does not catch.
Less suitable: A Honda, on the maker’s own line for this width, a deck that already sits close to the bar, or a scarifier that needs a knife roller.
Specifications
Common questions
What does the box include?
The listing says one 20 in (51 cm) blade, plus fittings, washers and push-on tines, so a petrol mower can be used to pull moss and thatch.
Will it fit every petrol mower?
The listing says most petrol mowers. Reviews name several that fitted with the washers, and others that needed grinding or that struck the deck. One review reports damage to a Hayter Harrier 41.
Does it collect the moss?
Reviews say it does not lift debris into the grass box the way a mowing blade does. People refit the normal blade or rake afterwards.
The Oregon 690-617-0 is the 16 in alloy-steel bar at £36.49 and 720 g, with fittings, washers and push-on tines, and the listing marks the host as petrol. It prints the same 4.2 from 1,289 ratings as the 51 cm ASIN, including comments about other widths, so those stars are not a clean vote for 16 in alone. Oregon’s UK page for this width titles it as fitting Honda, Stihl, Kawasaki and more, with a 1 in centre, and that Honda line belongs on this bar rather than on the 20 in part. The amazon text still says most petrol mowers of the clamshell dethatcher-bagger type and does not repeat that model list. Printed cutting-height fields of 16 in and 0.15 in are copied as they appear, and they are not a scarifying depth. Spin the bar by hand under the deck before the first pass, because a wrong hub hits the housing on a 16 in bar as well. Open this kit when your petrol deck is about 16 in and you have read the maker’s Honda line beside the amazon title.
Pros
Cons
Best for: You have a 16 in petrol rotary, you can check the hub, and you will read Oregon’s Honda note for this width next to the amazon title.
Less suitable: A 51 cm deck, an electric mower the listing does not cover, or a scarifier that needs its own roller.
Specifications
Common questions
How wide is this Oregon bar?
The listing cutting width is 16 in, model 690-617-0. The 51 cm version is a different ASIN.
What power does the listing assume?
The listing describes a universal blade for most petrol mowers and marks the power source as petrol.
Why is the review count the same as the 51 cm Oregon?
This listing prints 4.2 out of 5 from 1,289 ratings, and the review text in the saved listing is the same family set as the 51 cm ASIN, including comments about other widths.
This perfektGarten bar is 405 mm long and 3.2 mm thick at £22.90, with a 32 mm centre hole, adaptors for 19, 16 and 10 mm, and four springs. Side holes are 43 mm by 13 mm, with inner spacing of 28 mm and outer spacing of 114 mm. The amazon.co.uk line is 4.1 from 74 ratings. The bullets say petrol and electric mowers, a technical field also says petrol, and no model is named. A UK review needed the locking slots ground to fit, which is a modification. Material and weight are not stated. The printed bores are why it is more usable than the Redpart, whose hub is blank, when your centre is one of those sizes and the deck has room for 405 mm. The 410 mm bars from the same brand use a 21 mm centre, so the two patterns are separate parts.
Pros
Cons
Best for: Your rotary centre is 32, 19, 16 or 10 mm and the deck will take a 405 mm bar without grinding.
Less suitable: An 18 mm or 21 mm hub, or a mower you would have to modify.
Specifications
Common questions
Which bolt sizes do the adaptors cover?
The listing gives a 32 mm centre hole plus adaptors for 19, 16 and 10 mm. Side holes are 43 mm by 13 mm.
Can it go on an electric mower?
The bullets say petrol and electric lawnmowers. The technical field also says petrol. No model is named, and a UK review needed the locking slots ground to fit.
How thick is the bar?
The listing says 405 mm long and 3.2 mm thick, sold with 4 springs.
The Redpart Z8390 is a 16 in moss bar at £19.99, listed at 750 g with dimensions of 40.5 × 0.5 × 6 cm. Across 22 amazon.co.uk ratings the line is 3.9, a small and mixed sample for a conversion bar. The title says it suits most 16 in rotary mowers, but the technical block does not state a centre bore, side-hole spacing, or a material. One review says it missed a Honda because the blade shape was different, and another says the box had no instructions for mounting or for the tubes. You are buying a width claim at the low end of this set, rather than a measured hub. Check the old bar’s holes against the part in your hand before you take the mowing blade off. If the listing never named your mower, a mismatch is usually the wrong part.
Pros
Cons
Best for: You have already measured a 16 in rotary bar and you can check the hub against the part when it arrives.
Less suitable: You need a stated bore, a Honda-shaped hub, or a knife roller for a scarifier.
Specifications
Common questions
Which mowers does the listing say this fits?
The title says it fits most 16 in rotary lawnmowers. No model list is in the technical details. A review says it did not fit a Honda because the blade shape was different.
Does the listing include fitting instructions?
No instruction sheet is listed. One reviewer said there were no instructions for mounting or for fitting the tubes.
What size and weight are printed?
The listing gives 40.5 × 0.5 × 6 cm and 750 g. The title calls it a 16 in blade. Material and centre bore are not stated.
This second 410 mm perfektGarten bar is £16.45, also 3.5 mm thick, with the same 21 mm centre and adaptors for 18, 16 and 10 mm. The title says four hardened springs. Across 26 amazon.co.uk ratings the line is 3.8. A review says it did not fit an Einhell electric mower of 47 cm: the length matched and the width did not, and the power field on the listing says fuel powered. A review with a 24 mm hub said it did not fit, which sits outside the adaptor set. Another review received two springs and no fixing screws. Material and weight are not stated. The price is low for a 410 mm bar with the holes printed, which is why it stays in the set, but the box-count complaint and the electric miss keep it behind the Parkside spring pack on value. Order it when the hub is 21, 18, 16 or 10 mm on a petrol deck that has room, and count the springs before you fit them.
Pros
Cons
Best for: You have a petrol mower of 41 cm or larger, the hub is 21, 18, 16 or 10 mm, and you will count the springs on arrival.
Less suitable: A 24 mm hub, a 47 cm electric Einhell, or a 32 mm centre.
Specifications
Common questions
Will it fit a 47 cm electric mower?
The bullets say 41 cm and larger. A review says it did not fit an Einhell electric mower of 47 cm: the length matched and the width did not. The power field says fuel powered.
Which hub sizes are covered?
Centre hole 21 mm, with adaptors for 18, 16 and 10 mm. A review with a 24 mm hub said it did not fit.
Are four springs always in the box?
The title says four hardened springs. One review says only two arrived and there were no fixing screws.
The dearer perfektGarten 410 mm bar is £26.30, 3.5 mm thick alloy steel, with a 21 mm centre, adaptors for 18, 16 and 10 mm, and four hardened double springs. The listing claims mowers of 41 cm and larger, and the country of origin is given as Poland. Only six amazon.co.uk ratings sit behind a 3.5 star line. One review says the tines bent, hit the deck on the highest setting, and a claw broke off. Another says one spring arrived bent by about 2 cm, while a short review says it works perfectly. The page says assembly is not required, yet the title still includes four springs to fit, and no steps are printed. It is worth opening only if you want the double springs and you have already measured a 21, 18, 16 or 10 mm hub on a deck with clearance. On a tight deck, that review found the highest setting was still too low.
Pros
Cons
Best for: You measured a 21, 18, 16 or 10 mm hub on a deck of 41 cm or more, and you want double springs with room under the housing.
Less suitable: A tight deck, a 32 mm centre, or a purchase made on the star line.
Specifications
Common questions
Which mower width does the listing claim?
It says lawnmowers with a cutting width of 41 cm and larger, and bolts of 10, 16 or 18 mm. The centre hole is 21 mm with adaptors for 18, 16 and 10 mm.
What went wrong in the reviews?
One review says the tines bent, hit the deck on the highest setting, and a claw broke off. Another says one spring was bent by about 2 cm. A short review says it works perfectly. The listing shows 3.5 out of 5 from 6 ratings.
Is assembly required?
The listing field says assembly is not required. The title still includes four springs to fit. No fitting steps are printed.
Scores on this page are the figures already stored for each amazon.co.uk listing on 22 October 2026. A star rating is mapped as stars times 20, so 4.5 becomes 90. The Bluemars 5.0 from five ratings is held at 74 because the sample is small and the working width is not stated. The two Oregon rows share one 1,289-rating family, so both stay at 84 rather than treating that count as a separate test of each width. The highest score is the top pick. The best value is the named spring refill at the lowest captured price, not a mower bar. Nine listings stayed in: six mower conversion bars, two scarifier rollers and one spring refill. This is not a laboratory test. No torque and no lifespan were measured.
Amazon.co.uk listing score
100%The published score is the amazon.co.uk star rating multiplied by 20, with two stored exceptions. A 4.5 star line starts at 90. A 5.0 from five ratings is held at 74 because the sample is small and the working width is not stated. The two Oregon rows share one 1,289-rating family, so both stay at 84. The scoring note gives no separate percentages, so this listing score is the whole comparison. Width, hub, element and price stay in the table and the written assessment. The top pick is the highest of those stored scores. The best value is the lowest captured price among parts that name the host and still carry a usable review count.
Name the host, measure the old part, then match knife, spring or mower bar to the lawn. A near miss on length hits the deck or snaps a spring. This page does not treat a conversion bar as a certified scarifier.
A scarifier blade is the part that combs moss and thatch from a lawn. It is not the machine. In the UK the spare is a knife roller for a named scarifier, a pack of spring tines for an electric fan drum, or a flat steel bar bolted under a rotary mower in place of the mowing blade. You buy it when the old part is finished, or when you want one or two passes a year without a second machine. A roller for one scarifier does not fit under a rotary mower. A spring pack is not a knife roller.
A mowing blade and a brush-cutter blade are different parts. A scarifier spare is a knife roller, a spring pack, or a bar that replaces the mowing blade for a moss pass. Matching the search phrase is not the same as matching the host.
Working width is only one figure. You still need the centre hole or the adaptors, the side holes, or the shaft and pulley bore. A bar that is only nearly the right length hits the deck. A spring that is too long snaps.
The first pass stays at the highest setting, then one notch at a time. Depth is on the host, not on the spare. A conversion bar usually does not fill the grass box, so plan to refit the mowing blade or rake afterwards.
The host decides the part before any width does. A knife roller belongs to one named scarifier, with its own shaft and bearings, and it does not bolt under a rotary mower. A spring refill is coils for an electric fan drum. Fit is wire diameter, coil diameter and free length. A mower conversion bar replaces the mowing blade. A cylinder-mower cartridge is a different fitting, and a brush-cutter blade from the same search is the wrong object. Measure the old part rather than the title.
Match the element to the lawn, then to the first pass. Springs comb moss and should stay off the soil. Knives cut shallow slits for thatch. A 2-in-1 scarifier uses different drums, so a title that bundles a scarifier drum and an aerator does not prove both pieces are in the box. A conversion bar rakes moss. It usually does not fill the grass box. You refit the mowing blade or rake afterwards. Isolate the host before you fit the spare.
Three typical situations, each with a recommendation from this comparison.
You already own the Einhell petrol scarifier GC-SC 2240 P and the 40 cm roller is blunt, bent or gone. The Einhell 3420021 is the top pick at about £37.95: 18 blades, a ball-bearing drum, 2.7 kg, and 4.5 from 187 reviews. Reviews that matched the shaft cite about 15 minutes, and others report a pulley, shaft, keyway or length that does not match. Stop if the pulley will not slide on. Another Einhell width is a different part.
You own a rotary mower, the lawn is mossy rather than deep in thatch, and you will scarify once or twice a year if the bar actually fits. The perfektGarten 405 mm bar is about £22.90, with a 32 mm centre and adaptors for 19, 16 and 10 mm, four springs, and 4.1 from 74 reviews. A UK review ground the locking slots to make it fit. If your hub is not one of those sizes, this is the wrong bar. A conversion bar usually does not fill the grass box.
You scarify as paid work or you hire machines out, so PUWER 1998, guards and training sit on top of the domestic fitting steps. A householder is outside PUWER. This shelf does not replace a named spare for the machine you run. If that machine is the GC-SC 2240 P, the Einhell 3420021 is the roller that names it. If the bearings are seized, or the guards are missing, stop and use someone who does that work.
The top pick is the Einhell 3420021 at about £37.95. The stored score is 90, from 4.5 and 187 amazon.co.uk reviews, on an 18-blade roller named for the GC-SC 2240 P with a 40 cm width. Reviews still describe pulley, shaft, keyway and length mismatches, so you stop if the pulley will not slide on. The best value is the OTOTEC HO195W at about £15.99. The score is 86, from 4.3 and 43 reviews. It is 45 stainless springs for named Parkside models, with 1.6 mm wire and a 12 mm coil. Free length is not printed, and reviews say the springs were too long on a PLV 1500 B1. It is a spring refill, not a mower bar. Neither result is a laboratory test.
OTOTEC HO195W
Score 86 from 4.3 and 43 reviews at about £15.99, 45 springs for named Parkside models.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Buying notes from the sources below, checked for this page on 22 October 2026. Prices, stars and review counts are from the amazon.co.uk captures of that date.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Links use the tag pcuk26-21. The scores follow the listing rules above. They are not a lab test, and they do not promise the cheapest price.
