Simplicity Mower Blade Replacement by Number

Simplicity mower blades are matched by the stamped part number and confirmed with deck width, centre-hole type and lift, because Simplicity decks follow the AYP/Snapper spindle pattern used across several North American lawn brands. A replacement made to match the original specifications seats and cuts without relying on a "Simplicity-only" part.

What blade numbers do Simplicity mowers use?

Simplicity blades carry the brand's own part number, but the underlying profile follows the AYP/Snapper pattern, so the same deck geometry shows up under related labels. Common widths run on 168-series blades for 42-inch decks and wider high-lift profiles for 48- to 52-inch decks. The number opens the lookup; the physical blade confirms the fit.

Simplicity deck width	Typical profile	Cross-referenced AYP pattern	Also fits
42"	Mulching	422719 family	AYP, Husqvarna, Craftsman
42"–46"	Notched high lift	405380 family	AYP, Husqvarna
48"	Mulching	173920 family	AYP, Husqvarna

These profiles list Simplicity among their fitment brands, so they are the reference points for the deck widths Simplicity tractors most often run. We are an independent manufacturer and not an authorised Simplicity dealer, so none are our own house numbers.

Are Simplicity blades a proprietary design?

Simplicity blades are not a fully proprietary design, because the brand's decks share the AYP/Snapper spindle and centre-hole pattern with several other names. That shared geometry is why one stamped number can fit more than one label on a given deck width. Matching by number plus measured dimensions reaches the right profile without chasing a part marked "Simplicity" alone.

This matters when a deck is older or the stamping is worn. A Simplicity rider from one year may use the same 42-inch mulching blade as an AYP or Husqvarna tractor of the same width. Our OEM matching guide explains how to read a worn stamping into a confirmed fit.

How do I match a Simplicity blade by number?

Match a Simplicity blade by pairing the stamped number with four measured facts — overall length, centre-hole type, thickness and lift — because deck width alone does not fix the geometry. The number selects the candidate; the four measurements confirm it.

Measure the old blade tip to tip, note whether the centre hole is round, star or multi-point, caliper the thickness, and confirm which way the blade turns. With those four facts plus deck width, a supplier can name the right profile even when the digits are illegible. Our blade measuring guide shows exactly what to record before you write to a supplier.

Which blade type suits a Simplicity deck?

A mulching or high-lift blade suits most Simplicity decks, because the lighter spindle loads and moderate ground speeds of a garden tractor favour a profile that lifts clippings into the chute. Mulching blades trade some lift for fine recutting, so pick by what you do with the clippings.

Blade type	Suited to	Trade-off on a Simplicity deck
Mulching	Recycling leaves and fine clippings	Needs slower ground speed
High lift	Bagging, tall or wet grass	Can throw clippings harder than needed
Notched high lift	Bagging plus durability on grit	Heavier; slightly more draw

The 422719 mulching blade and 405380 notched high lift cover the common 42–46-inch Simplicity widths, while the 173920 mulching blade serves the 48-inch decks. Browse the model index for stock shapes across every width we cut.

What steel and hardness should a Simplicity-fit blade use?

A Simplicity-fit replacement should be cut from 40Mn manganese steel and hardened to a 45–50 HRC band, which holds the edge through grit yet resists cracking on hidden stone. That balance, not a single high number, is what keeps a deck blade working through a long season.

We run production in Guangde, Anhui, where the plant has made blades since 2008 and now employs more than 800 people with a daily capacity of 50,000 pieces. The same heat-treat control that decides working life is detailed on our quality page, which is the part of production that most affects how a blade performs under real mowing load.

Can I order custom Simplicity-fit blades made to a sample?

You can order custom Simplicity-fit blades made to a supplied sample or drawing, and the minimum run is normally 300 pieces per profile. Share the old blade or its part number and we will confirm fitment, profile and run size before any cutting begins.

Blades we supply are made to match the original specifications of the part number you send, cut from 40Mn steel and held in the 45–50 HRC band we run across the catalogue. The 300-piece minimum covers the setup and heat-treat run for a made-to-sample blade. Send your part number or a photo of the old blade to start, or see the model index for stock shapes.

Frequently Asked Questions

Are your Simplicity-fit blades original Simplicity parts?

We are an independent manufacturer and not an authorised Simplicity dealer, so our blades are not original factory parts. They are made to match the original specifications of the part number you send, cut from 40Mn steel and held in the 45–50 HRC band we run across the catalogue.

How do I find the part number on a Simplicity blade?

Look for a stamped number near the centre hole on the top face of the old blade, because that is where AYP-family and contract manufacturers usually place the identifier. If the stamping is worn, measure length, centre hole, thickness and lift, then match those four facts to a Simplicity-fit profile instead of relying on the digits alone.

Can I use a universal blade on a Simplicity deck?

A true universal blade rarely fits a Simplicity spindle correctly, because the centre hole, length and lift must match the AYP/Snapper deck geometry exactly. Always match the four measured dimensions to a Simplicity-fit profile instead of assuming a generic blade will seat and balance safely.

What is the minimum order for custom Simplicity-fit blades?

The minimum order is 300 pieces per blade profile, which covers the setup and heat-treat run for a made-to-sample blade. Custom steel such as SK5 can be quoted, and mixed profiles can be combined across a single production window to reach the minimum.

How often should I replace Simplicity mower blades?

Replace Simplicity blades when the cutting edge shows nicks deeper than a coin, when the ends are worn past the original width, or when you see cracks near the centre hole. Garden tractors typically need a fresh blade each season, with mid-season sharpening in between rather than waiting for failure.