John Deere Mower Blade Bolt Torque Specs
John Deere lawn tractors (D, E, S, X series) use a 5/8" blade bolt with the famous M115495 torque-to-yield bolt; ZTrak commercial Z-turns use a 15/16" stepped bolt with mandatory threadlocker.
What torque should I use on a John Deere blade bolt?
John Deere blade bolt torque is typically 40–55 ft-lb on a 15/16" socket with 5/8"-18 UNF thread. Threadlocker: Blue Loctite required on ZTrak and X300/X500 series. 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.
John Deere D130 (22HP, 42" Deck) blade bolt torque
40–45 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Twin-blade deck. Bolt M115495 is torque-to-yield — replace it, do not reuse.
John Deere Z355E (ZTrak, 48" Deck) blade bolt torque
50–55 ft-lb on a 15/16" socket, 5/8"-18 UNF thread. Apply Loctite 242. Replace bolt every cut season.
Pro tip for John Deere blade service
The John Deere blade bolt (M115495 / M83472) is officially single-use on the X500/X700 series — the manual says replace it every blade change, $4 each, never reuse.
Step-by-step John Deere 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 required on ZTrak and X300/X500 series. Torque in one smooth pull with a calibrated torque wrench. Re-check after first hour of cutting.
Related lookups
- All Mower Blade Bolt Torque Specs
- Briggs & Stratton Blade Bolt Torque
- Walk-Behind Mower Blade Bolt Torque
- John Deere D130 (22HP, 42" Deck) (40–45 ft-lb)
- John Deere Z355E (ZTrak, 48" Deck) (50–55 ft-lb)
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