720-04061 Lawn Mower Seat Knob Replacement Part for MTD, Troy-Bilt, Yard Man, Arnold, Remington, Yard Machines, Craftsman, Columbia, Murray, Robomow, Replaces Knob Part Regulate Bolt (4 Pack)

What It Is

This 4-pack of replacement seat knobs (part 720-04061) secures the mower seat to the adjustment bracket, allowing you to loosen, slide, and lock the seat position without tools. Designed for riding mowers and tractors, it replaces the factory plastic knob that often strips or breaks from repeated use.

Fitment & Compatibility

Before buying, measure the threaded stud: this knob uses a 5/16"-18 thread, about 1/2" long. Check your mower’s model number (stamped on the frame or under the seat) for part 720-04061 or equivalent OEM numbers (e.g., 720-04061A, 732-04061). Fits most MTD, Troy-Bilt, Yard Man, Arnold, Remington, Yard Machines, Craftsman, Columbia, Murray, and Robomow models with a single-bolt seat adjustment—typically 2000s–2010s tractors. If your seat uses a lever or different thread pitch (e.g., 1/4"-20), this won’t work. Aftermarket; not genuine OEM, but matches OEM specs.

Key Things to Know

• Quality: Sturdy nylon/plastic construction with metal insert for the threads; holds up better than stock soft plastic knobs. Four-pack gives you spares.
• Installation: Tool-free—just unscrew the old knob, hand-tighten the new one onto the seat bracket bolt. Takes 30 seconds.
• Common gotcha: The knob may be slightly larger than the original, so check clearance if your seat sits tight against a fender or fuel tank.
• Durability: Not metal, so avoid overtightening—hand-tight is enough. Over-torquing can strip the plastic.

Should You Buy It

If your mower seat knob is cracked, stripped, or missing, this is a cheap, direct fix. Best for owners of MTD-family riding mowers (Troy-Bilt, Craftsman, Yard Machines) needing a quick, tool-free seat adjustment. Skip if your seat uses a different thread or a lever-style lock.