The Complete PowerSmart Lawn Mower Blade Breakdown and Fit Guide

Best for: Standard 21-inch PowerSmart gas mower owners

Pros

• Genuine OEM replacement
• Balanced 3-in-1 cutting profile
• Durable 3.5mm steel build

Cons

• Only fits listed 21-inch gas models
• Hole measurements not specified

The PowerSmart 21 in. Replacement Mower Blade is an official factory replacement part manufactured by Amerisun Inc. under model number PowerSmart 303071739. Designed for 21-inch gasoline-powered lawn mowers, this blade directly fits the DB8721P, DV8621C2, DV8621P2, and DV8621S2 walk-behind units. Crafted from durable black steel, the component has an overall length of 508 mm (20 inches), a width of 57 mm (2.24 inches), and a plate thickness of 3.5 mm (1/8 inch), with a weight of 1.7 pounds. The listing specifies manual operation on gas models and notes that the blade executes 3-in-1 mowing duties, supporting mulching, bagging, and side discharge setups.

In standard mowing routines, this blade creates finer grass clippings, helping reduce clumping across turf and allowing rear collection bags to hold more material between emptying cycles. Homeowners operating one of the supported 21-inch gas models will find this factory part provides an effortless replacement. Much like choosing an alternative lawn mower blade troy bilt setups require, matching deck size is critical. However, the listing does not specify the center mounting hole diameter or side hole center distances for this model, and users managing DB8621 or 22-inch decks must turn to the alternative options listed below.

Best for: PowerSmart PS76821 walk-behind mower operators

Pros

• Replaces equipment part 303240638
• Stout 4.1mm tempered construction
• Full 530mm reach for 21-inch decks

Cons

• Fits single specific machine series
• Requires 12.2mm center spindle

Best for: PowerSmart V8621S and DV8621S bagger setups

Pros

• High-lift curve for bagging efficiency
• Heat-treated 45 HRC carbon steel
• Direct replacement for part 202270012

Cons

• Not engineered for fine mulching
• Restricted to 15mm center spindles

The perfektGarten 53 CM 21″ lawnmower blade is an aftermarket replacement part manufactured under model number 078 to replace PowerSmart part 202270012. Built exclusively for PowerSmart V8621S and DV8621S walk-behind mowers, this blade measures 530 mm (20.87 inches) in length, 50 mm (1.97 inches) in width, and 3.5 mm in plate thickness. The mounting structure features a 15 mm central hole diameter (ZB) alongside side holes (AL) measuring 15 mm and 12 by 18 mm, spaced 60 mm apart center-to-center (AB). The blade is produced from certified carbon-containing steel that has been quenched and tempered to a 45 HRC hardness rating.

The lifting profile of this blade is contoured with a pronounced rear bend designed to throw grass clippings forcefully into the collection bag until it is completely filled. It is also tailored for clean ejection through side discharge chutes, making it a reliable solution for operators dealing with fast-growing turf. This high-lift configuration suits property owners who routinely bag or side-discharge their clippings on V8621S chassis. However, because it lacks dedicated mulching teeth and relies on a large 15 mm center hole with 60 mm pin spacing, it gives way to other models when operators require fine mulching or use 12.2 mm spindle shafts.

Best for: PowerSmart DB8621C and DB8621P mower operators

Pros

• Direct replacement for part 303071037
• Rigid 3.7mm heat-treated steel
• Triple-action mulching and bagging geometry

Cons

• Center hole limited to 12.2mm spindles
• Cannot fit 22-inch mower decks

The perfektGarten 51 CM lawnmower mulching blade carries item model number 206 and acts as a direct replacement for the PowerSmart 303071037 blade. Designed specifically for PowerSmart DB8621C and DB8621P models, this blade measures 510 mm (20.08 inches) in total length, 56 mm in width, and 3.7 mm in thickness. The mounting pattern consists of a 12.2 mm central hole (ZB) and side holes (AL) measuring 9.5 by 12.5 mm set at a 62 mm center-to-center distance (AB). It is manufactured from certified carbon-containing steel hardened to 45 HRC, which the manufacturer notes guarantees at least three seasons of life alongside deformation resistance.

This blade operates with a full 3-in-1 cutting system, allowing users to alternate between catching clippings, side throwing, and in-deck mulching. The increased 3.7 mm plate thickness provides extra rigidity when working through thick turf or uneven terrain. While battery-powered lawn tools like a greenworks 16 inch lawn mower blade rely on lighter steel to preserve motor runtime, this gas-oriented replacement leverages solid steel mass to maintain momentum. It serves as an exact PowerSmart mower blade replacement for DB8621 owners, though it will not provide sufficient cutting width for larger 22-inch mower decks.

Best for: PSM9422SR and DB-series 22-inch mower owners

Pros

• Heavy-duty 4.2mm hardened steel
• Replaces factory number 303070862
• Wide 560mm cutting coverage

Cons

• Restricted to 22-inch mower decks
• Requires 62mm side-pin spacing

Best for: PowerSmart 22-inch broad deck mower users

Pros

• Substantial 4.2mm plate thickness
• Wide 560mm cutting span
• Direct substitute for part 303070862

Cons

• Restricted to 22-inch mower decks

The perfektGarten 56 CM 22″ lawnmower mulching blade is designated under item model number 208 and replaces PowerSmart original part 303070862. This blade is engineered for wide-deck PowerSmart machines, listing compatibility with PSM2022, PSM2322SR, DB9422SR, PSM9422SR, DB8622SR, and DB2322SR walk-behind mowers. Key measurements include an overall length of 560 mm (22.05 inches), a width of 57 mm, and a substantial 4.2 mm plate thickness. Spindle mounting is accommodated through a 12.2 mm central hole (ZB) and dual side holes (AL) measuring 9.5 by 12.5 mm separated by 62 mm (AB).

Engineered for high-volume yard maintenance, this PowerSmart 22 inch mower blade provides 3-in-1 functionality across mulching, bagging, and side discharge workflows. Its heavy 4.2 mm carbon steel construction is heat-treated to 45 HRC to withstand accidental stone strikes without bending or warping out of balance. Property owners with expansive lawns powered by 22-inch PowerSmart engines will appreciate the increased rotational reach and robust mulch circulation. However, because of its 560 mm span, it cannot physically fit into 21-inch mower decks, where smaller 508 mm or 530 mm alternatives must be selected instead.

This entry for the perfektGarten 56 CM 22″ lawnmower mulching blade shares model number 208 and replaces the factory PowerSmart 303070862 blade. The listing features prominent compatibility for PowerSmart PSM9422SR, DB8622SR, and DB2322SR models, while also supporting PSM2022, PSM2322SR, and DB9422SR units. Built from heat-treated carbon-alloy steel quenched to 45 HRC, the blade spans 560 mm in length, 57 mm in width, and 4.2 mm in thickness. Its hub connection relies on a 12.2 mm central hole (ZB) and side holes (AL) of 9.5 by 12.5 mm set at a 62 mm center-to-center distance (AB).

Just as equipment specialists emphasize precise spindle balance when mounting a milwaukee lawn mower blade, maintaining exact hole spacing on PowerSmart shafts prevents harmful motor vibration. The 3-in-1 blade profile handles collection, side chute evacuation, and nutrient-rich mulching with consistent stability. Operators maintaining larger residential turf with 22-inch self-propelled models will benefit from its heavy-gauge steel. When evaluating which PowerSmart lawn mower blade to buy for wide decks, this listing provides a heavy-duty option, but gives way to narrower models if your mower housing measures 21 inches.

The perfektGarten 53 CM 21″ lawnmower mulching blade carries manufacturer part number 207 and acts as the direct replacement for PowerSmart 303240638 mulching blade hardware. Tailored specifically for the PowerSmart PS76821 lawn mower, this blade features a length of 530 mm (20.87 inches), a width of 56 mm, and a reinforced 4.1 mm plate thickness. Mounting holes include a 12.2 mm central opening (ZB) flanked by 9.5 by 12.5 mm side holes (AL) spaced 62 mm apart (AB). Manufactured from certified carbon-containing steel treated to 45 HRC, it is built to resist deformation over at least three seasons of active lawn care.

Designed around 3-in-1 capability, this blade supports throwing, catching, and mulching operations within the PS76821 deck. Its 4.1 mm thickness provides noticeably more rigidity than basic 3.5 mm factory blades, ensuring clean cuts through overgrown, moisture-heavy grass. Turf care enthusiasts who prefer finely diced mulch over bagging will appreciate the balance of mulching efficiency and deck ventilation this profile delivers. However, because its mounting dimensions and length are tuned specifically to the PS76821 chassis, owners of other 21-inch or 22-inch PowerSmart models must choose an alternative blade tailored to their specific spindle pattern.