Gravely Mower Blade Bolt Torque Specs

Gravely commercial Pro-Turn and Pro-Stance Z-turns use a 15/16" blade bolt; the residential ZT-XL line drops to 5/8". Both call for blue threadlocker.

What torque should I use on a Gravely blade bolt?

Gravely blade bolt torque is typically 90–110 ft-lb on a 15/16" socket with 5/8"-18 UNF thread. Threadlocker: Blue Loctite 242 required. Always confirm the exact figure for your specific model — deck design, blade thickness, and spindle stack-up move the spec by 10–20 ft-lb between models in the same brand line.

Gravely ZT-XL 52 (Residential Zero-Turn) blade bolt torque

85–95 ft-lb on a 5/8" socket, 7/16"-20 UNF thread. Apply Loctite. Cup washer cup-side toward bolt head.

Gravely Pro-Turn 260 (Commercial Zero-Turn) blade bolt torque

100–110 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Stepped washer stack — cup first, flat second, then bolt.

Pro tip for Gravely blade service

Gravely Pro-Turn 600 series uses a unique stepped washer stack — the order matters: cup-washer first, flat washer second, then bolt. Reversing them loses preload within an hour of mowing.

Step-by-step Gravely blade-bolt reinstall

Disconnect the spark plug, engage parking brake, tip the mower (carb-side up). Block the blade with a 2×4 — never your hand. Use a 1/2" drive breaker bar with a 6-point socket. Clean threads with brake cleaner. Apply Blue Loctite 242 required. Torque in one smooth pull with a calibrated torque wrench. Re-check after first hour of cutting.

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