720-05381 Seat 3 Prong Knob Replacement Compatible with Cub Cadet Z560 Z54 Z42 ZT1 ZT2 Z5800 Z5650 Zero Turn Mowers, 5/16-18 Seat Adjustment Hand Knob, Black, 1 Pack

What It Is

This is a replacement 5/16-18 threaded hand knob for adjusting the seat position on specific Cub Cadet zero-turn mowers. It secures the seat to the slide rail, letting you lock the seat at your desired fore/aft position without tools.

Fitment & Compatibility

Before buying, confirm your mower model and seat slide hardware. This knob fits Cub Cadet Z560, Z54, Z42, ZT1, ZT2, Z5800, and Z5650 zero-turn mowers. The thread size is 5/16-18 (coarse thread). Measure the diameter and thread pitch of your existing knob’s stud—if it’s 5/16-18, this will work. Also check that the knob’s head diameter (approx. 1.5”) clears any seat frame or bracket obstructions. It is not listed as OEM Cub Cadet; it’s a direct aftermarket replacement.

Key Things to Know

• Installation – Hand-tighten only; no tools needed. Over-tightening can strip the plastic threads or damage the seat slide.
• Quality – Black plastic knob with molded threads. It’s serviceable but may feel less durable than OEM metal inserts. Handle with care when tightening.
• Gotcha – If your original knob has a metal insert or a different thread (e.g., 1/4-20), this won’t fit. Double-check your existing knob’s thread before ordering.
• Common Issue – Some users report the knob loosens over time from vibration. Periodically check and re-tighten.

Should You Buy It

Buy this if you need a simple, low-cost replacement for a broken or missing seat adjustment knob on a compatible Cub Cadet zero-turn mower and are comfortable with a plastic aftermarket part. Skip it if you prefer OEM metal hardware or have a non-listed model—verify fitment first.