5101755S Lawn Mower Blades Replacement for Ferris Scag Bad Boy 61 Inch Deck Lawn Mower Blades 5020842 5101755 20842S 5020842S 596-347 481712 A48111 481708 91-626 Length 21"- 3 Pack

What It Is

This is a 3-pack of 21-inch replacement blades designed for 61-inch zero-turn mower decks. They fit Ferris, Scag, and Bad Boy mowers, offering a direct aftermarket alternative to multiple OEM blade part numbers.

Fitment & Compatibility

Before buying, confirm your deck is exactly 61 inches (three 21-inch blades). These replace OEM numbers including 5101755, 5020842, 20842S, 5020842S, 596-347, 481712, A48111, 481708, and 91-626. They fit many Ferris IS series, Scag Turf Tiger/Wildcat, and Bad Boy Outlaw/ZT models. Measure your existing blade length and center hole diameter—these have a 5/8” center hole and 1” diameter blade-mounting holes. Check your spindle bolt thread size (typically 5/8”-18 or 3/8”-24) to ensure the blade’s center hole matches.

Key Things to Know

• Quality: Made of heat-treated steel with a hardened edge. Expect similar durability to OEM, but inspect for balance—some aftermarket blades may need minor balancing before installation.
• Installation: Moderate difficulty. Use a blade removal tool and torque wrench (70-90 ft-lbs recommended). Always lift the deck, disconnect the spark plug, and block the blade securely.
• Gotchas: These are straight blades, not high-lift or mulching. If you need aggressive grass discharge or fine mulching, look for a different design. Also, verify your spindle spindle height—some Ferris decks require a specific blade thickness (typically 0.188” or 0.203”).
• Pack: You get three blades—enough for a full deck replacement. No hardware included; reuse your original bolts and washers.

Should You Buy It

If you need a budget-friendly, direct replacement for a 61-inch Ferris, Scag, or Bad Boy zero-turn deck and you’re comfortable with basic blade installation, this is a solid choice. It’s not for mulching decks or mowers with non-standard spindle configurations. For the price, it offers good value compared to OEM, but double-check your deck’s blade thickness requirement before ordering.