Center hole
S-shape mower blade hole: Cub Cadet and Craftsman 42-inch sets
Cub Cadet's 490-110-C202 and Craftsman's CMXGZAM110191 42-inch sets use an S-shape hole; Craftsman says it stops the blade going on upside down.
Also listed as S-shaped hole, S hole
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Short answer
Cub Cadet's 490-110-C202 42-inch set holds two blades with an S-shape center hole for Cub Cadet lawn tractors and RZT mowers with 42-inch decks. Craftsman's CMXGZAM110191 two-blade ultra high-lift set also uses an S-shaped hole, which Craftsman says means the blades cannot be installed upside down.
Key facts
- How to recognize it
- A center hole shaped like the letter S rather than a circle, star or bow tie.[1][2]
- How to measure or name it
- Named by shape (S-shape) on the maker's packaging and page; no size is given.[1][2]
- What it mounts to
- Not confirmedNeither maker states what the S-shape hole mounts to.
- How catalogs name it
- Cub Cadet: "S-shape center hole". Craftsman: "S-shaped center hole pattern".[2][1]
- Blades made with it
- Cub Cadet 490-110-C202: 42-inch Xtreme mulching set, two blades. Craftsman CMXGZAM110191: 42-inch ultra high-lift bagging set, two blades.[2][1]
- Mowers and decks that use it
- Cub Cadet: lawn tractors and RZT mowers with 42-inch decks (490-110-C202). Craftsman: Craftsman mowers that use part 742P05177 / 742-05177 (CMXGZAM110191).[2][1]
- Common mix-ups
- Craftsman's other 42-inch sets use 5-point and 6-point star holes, so a 42-inch label does not tell you the hole. Craftsman says the S-shape prevents upside-down installation; that is a reason not to swap hole types.[1][3][4]
- Not confirmed
- Not confirmedBlade lengths, hole size, what it mounts to and full model lists.
Watch out for
- Never drill, grind or file a center hole to fit, and never fit a blade whose hole does not match your spindle or adapter.
- The S-shape is there so the blade goes on one way only, per Craftsman. Never force a blade on.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
42-inch two-blade set (Cub Cadet)
Cub Cadet 490‑110‑C202 Xtreme mulching blade set for 42 in decks, set of 2Choose set 490-110-C202, two blades.
Cub Cadet states an S-shape center hole; for Cub Cadet lawn tractors and RZT mowers with 42-inch decks.
This page describes a hole shape. It is not a fit list: use the blade's part number and your mower's model.
Questions
Why do some blades have an S-shaped hole?
Craftsman says the S-shaped center hole on its CMXGZAM110191 set ensures proper installation, so the blades cannot be installed upside down.[1]
Which Cub Cadet blades have an S-shape hole?
Cub Cadet's 490-110-C202 42-inch Xtreme mulching set, two blades, for Cub Cadet lawn tractors and RZT mowers with 42-inch decks.[2]