Blades per deck: why deck width does not give blade length

Short answer

A deck's width does not tell you its blade length or its blade count. Oregon lists 17-1/16 inch blades used three per 48-inch cut, and 25-inch blades used two per 48-inch cut on other decks. Find your own deck's blade record by part number, then match length, hole and count.

Picks that fitAll picks and how to choose

MTD Genuine Parts 490‑110‑M143 2‑in‑1 blade set for 54 in decks, set of 3Check price on Amazon
Oregon 98‑152 17‑1/4 in high-lift blades for 50 in MTD and Cub Cadet decks, pack of 3Check price on Amazon

Same width, different blades

The nominal deck width is the cut width the maker names the deck by. It is a label, not a blade spec. Two Oregon records show why:

Oregon's 92-105 mulching blade is 17-1/16 inches long with a 7-point star center hole, and Oregon says it takes three blades for a 48-inch cut.^[1]
Oregon's 91-544 is a 25-inch low-lift blade, used two per 48-inch cut and three per 72-inch cut.^[2]

Both are 48-inch decks. One takes three short blades and the other two long ones. Blades overlap and spindles sit at different spacings, so dividing the deck width by the number of blades gives a number that matches neither. Do not do it.

Sets by deck

Some aftermarket sets are sold by deck. Oregon sells 42TGR1HL2 as a set of two for 42-inch Toro/Exmark riding mower decks, and 50TGR1HL3 as a set of three for 50-inch Toro/Exmark zero-turn decks.^[3] Those counts are for those Toro and Exmark decks only. They do not set the count for every 42-inch or 50-inch deck.

Is a listing one blade or a set?

Read the count on every listing.

Toro's 115-5059-03 is a single 17.5-inch replacement blade for select TimeCutters built in 2011 and later.^[4]
Toro's 79016P page names a pack in its title but says in its text that the blade is sold individually.^[5] Check the quantity at purchase.

A blade set that covers one 42-inch deck may not cover yours, and a "set" can hold a single blade. Craftsman's 42-inch CMXGZAM110108, for example, contains one blade.^[6] Our 42-inch blade set guide compares the counts.

Deck construction changes parts

The way a deck is built also matters. Husqvarna's fit chart classifies baggers and mulch kits by deck size and by deck style: Stamped, Fabricated, Clear Cut and LRV.^[7] Cub Cadet's manual for its 50/54-inch double bagger says 54-inch fabricated decks take the discharge chute directly, while 50 and 54-inch stamped decks need a chute adapter first.^[8] See the 54-inch deck page.

Left-hand and right-hand blades

Some decks use blades made for opposite cut directions. Oregon's catalog records an L-cut flag for each blade,^[9] and its online catalog filters by left- or right-hand cut.^[3] There is no brand-wide rule for which direction a deck uses. Match each spindle position to your deck's own record.

Examples at a glance

Deck example	Blades	Blade length	Source
48 in cut (Oregon 92-105 applications)	3	17-1/16 in	Oregon^[1]
48 in cut (Oregon 91-544 applications)	2	25 in	Oregon^[2]
72 in cut (Oregon 91-544 applications)	3	25 in	Oregon^[2]
42 in Toro/Exmark riding deck (42TGR1HL2)	2	not in our record	Oregon^[3]
50 in Toro/Exmark zero-turn deck (50TGR1HL3)	3	not in our record	Oregon^[3]

Use the deck size blade finder to see the records we hold for each deck size, then confirm against your own parts list.

Approved two-blade sets for 42-inch decks

Picks that fit2 products

Cub Cadet 490-110-C202, set of 2 S-shape blades, for Cub Cadet lawn tractors and RZT mowers with 42 in decks.

Blades per deck and blade length