eXmark Radius X 52" Zero-Turn Blade Bolt Torque
The blade bolt torque on the eXmark Radius X 52" Zero-Turn is 50–60 ft-lb (68–81 N·m). Exmark Radius Operator's Manual 4505-549 Rev. A (E/S/X-Series, 48"/52"/60"), Torque Requirements table (p.17): "Blade Mounting Bolt (lubricate with anti-seize) 50-60 ft-lb (68-81 N-m)"; Check Mower Blades (p.57): "Place wrench on the top spindle nut then torque the blade bolts to 50-60 ft-lb (68-81 N-m)." Copper-based anti-seize on the threads per the manual. The 130–160 ft-lb figure nearby in the table is the blade drive SHEAVE nut, not the blade bolt. Socket and thread size are not stated.
What's the exact spec for the eXmark Radius X 52" Zero-Turn?
Torque: 50–60 ft-lb (68–81 N·m). Threadlocker: Exmark manuals call for anti-seize on the blade bolt, not threadlocker. Exmark Radius Operator's Manual 4505-549 Rev. A (E/S/X-Series, 48"/52"/60"), Torque Requirements table (p.17): "Blade Mounting Bolt (lubricate with anti-seize) 50-60 ft-lb (68-81 N-m)"; Check Mower Blades (p.57): "Place wrench on the top spindle nut then torque the blade bolts to 50-60 ft-lb (68-81 N-m)." Copper-based anti-seize on the threads per the manual. The 130–160 ft-lb figure nearby in the table is the blade drive SHEAVE nut, not the blade bolt. Socket and thread size are not stated.
Step-by-step eXmark Radius X 52" Zero-Turn blade-bolt reinstall
1) Disconnect the spark plug and engage the parking brake. 2) Block the blade with a 2×4 wedged against the deck shell — never your hand. 3) Use a 1/2" drive breaker bar with an impact socket sized to the blade bolt to break the bolt loose. 4) Clean threads with brake cleaner and inspect the bolt for stretch. 5) Apply copper-based anti-seize to the bolt threads before reinstalling, as the manual instructs. 6) Torque to 50–60 ft-lb (68–81 N·m) in one smooth pull with a calibrated torque wrench. 7) Re-check after the first hour of cutting.
Common eXmark Radius X 52" Zero-Turn blade-bolt mistakes
Over-torque past spec stretches the bolt past yield — it will not hold the next reinstall. Under-torque lets the blade walk loose at full RPM, which destroys the spindle key and balance. Using a 12-point socket on a rusted bolt rounds the head; always use 6-point. Exmark's procedure: "Apply lubricant to threads of blade bolt to prevent seizing. Copper-based anti-seize preferable... Install blade bolt finger tight. Place wrench on the top spindle nut then torque the blade bolts to 50-60 ft-lb." Do not confuse with the 160–185 ft-lb Cutter Housing Spindle Nut row.
What socket fits the eXmark Radius X 52" Zero-Turn blade bolt?
A 6-point impact socket sized to the blade bolt — the manual doesn’t state an exact size, so confirm it against the bolt head before buying one on a 1/2" drive breaker bar. A 12-point socket can be used in a pinch on a clean, sharp-edged bolt head — never on a rusted bolt.
Related lookups
- All eXmark Blade Bolt Torque Specs
- All Mower Brand Blade Specs
- Wrench & Socket Size Finder
- eXmark Lazer Z X 60" Commercial Zero-Turn (50–60 ft-lb (68–81 N·m))
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