John Deere X350 Select Series (42A Deck) Blade Bolt Torque
The blade bolt torque on the John Deere X350 Select Series (42A Deck) is 50 lb-ft (68 N·m). Blade CAP SCREW on 42A/48A/54A decks. Manual OMM174378 (X350/X354/X370/X380/X384/X390/X394), "Servicing Mower Blades": "42A, 48A, and 54A Mowers... install cap screw onto spindle shaft. Block mower blade with a piece of wood to prevent spinning and tighten cap screw to specification. Cap Screw — Torque: 68 N·m (50 lb·ft)." The 42M mulching deck uses a NUT instead: "Nut (42M) — Torque: 88 N·m (65 lb·ft)." Screw size is not stated.
What's the exact spec for the John Deere X350 Select Series (42A Deck)?
Torque: 50 lb-ft (68 N·m). Threadlocker: Not called for in the Deere operator's manuals cited below. Blade CAP SCREW on 42A/48A/54A decks. Manual OMM174378 (X350/X354/X370/X380/X384/X390/X394), "Servicing Mower Blades": "42A, 48A, and 54A Mowers... install cap screw onto spindle shaft. Block mower blade with a piece of wood to prevent spinning and tighten cap screw to specification. Cap Screw — Torque: 68 N·m (50 lb·ft)." The 42M mulching deck uses a NUT instead: "Nut (42M) — Torque: 88 N·m (65 lb·ft)." Screw size is not stated.
Step-by-step John Deere X350 Select Series (42A Deck) 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) Reinstall with no threadlocker. 6) Torque to 50 lb-ft (68 N·m) in one smooth pull with a calibrated torque wrench. 7) Re-check after the first hour of cutting.
Common John Deere X350 Select Series (42A Deck) 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. Deere lists two different fasteners across its lines — a blade NUT at 65 lb-ft (100 Series) and a blade BOLT/cap screw at 50 lb-ft (ZTrak, X300 42A/48A/54A) — so check which your deck has before setting the wrench. Install the washer cupped side toward the blade.
What socket fits the John Deere X350 Select Series (42A Deck) 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 John Deere Blade Bolt Torque Specs
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- Wrench & Socket Size Finder
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- John Deere Z355E (ZTrak, 48" Deck) (50 lb-ft (68 N·m))
- John Deere X300 Select Series (38"/42" Edge Xtra Deck) (65 lb-ft (88 N·m))
- John Deere S100 (100 Series Lawn Tractor) (65 lb-ft (88 N·m))
- John Deere S120 (100 Series Lawn Tractor) (65 lb-ft (88 N·m))
- John Deere E120 (E100 Series Lawn Tractor) (65 lb-ft (88 N·m))
- John Deere Z335E (ZTrak, 42A Deck) (50 lb-ft (68 N·m))
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