Description
Overview:
The Flywheel Nut for Husqvarna petrol machines is a metal fastener used to secure the flywheel to the crankshaft, helping to maintain correct alignment and dependable ignition timing under engine vibration. Identified by OEM No. 503 22 04-01 (MPN: 503220401), it offers a precise fit on specified Husqvarna equipment such as the 353 and 359 chainsaws. It is suitable for replacing worn, rounded, or missing nuts during routine servicing or engine rebuilds. The robust construction supports long service life in demanding conditions faced by professional users and domestic operators. Designed to be installed with standard hand tools, it is a straightforward, model-specific replacement that restores secure clamping of the flywheel and contributes to smooth starting and reliable operation.
Key Features:
- OEM-referenced part (503 22 04-01 / 503220401) for accurate identification and fit
- Durable metal construction for reliable clamping under vibration
- Precise, model-specific fit for the Husqvarna machines listed
- Helps maintain flywheel position and stable ignition timing
- Standard hex profile for easy installation and removal with common tools
- Suitable replacement when the original nut is damaged, stripped, or lost
- Supports dependable chainsaw and power tool performance in professional and DIY use
Typical Applications:
Used when refitting or replacing the flywheel during maintenance, crankshaft or key inspections, ignition repairs, or full engine rebuilds. Ideal after flywheel removal for servicing, when the original nut shows wear, or whenever secure flywheel retention is required to ensure consistent starting and running.
Also known as:
Flywheel retaining nut, flywheel fastener, crankshaft flywheel nut, engine flywheel nut, chainsaw flywheel fixing nut, retaining fastener.
Fits Models:
135, 135E, 140E, 225 L, 225 LD, 225L, 225LD, 225R, 225RD, 225RJ, 227 L, 227 LD, 227L, 227LD, 227R, 227RD, 227RJ, 232R, 235FR, 235R, 235RII, 240RBD, 240RJ, 268, 340, 340E, 343F, 343FR, 343R, 345, 345E, 345FR, 345FX, 345FXT, 345R, 345RX, 346XP, 350, 351, 353, 355FRM, 355FX, 355FXT, 355RX, 356BF, 356BT, 357XP, 359, 371K, 372XP, 375K, 435, 435E, 435EII, 435II, 440E, 440EII, 440II, 445, 445E, 445EII, 445II, 450, 450E, 450EII, 455, 455 Rancher, 455 Rancher II, 455E, 455E Rancher II, 455ERancherII, 460, 461, 465 Rancher II, 465RancherII, 545, 545 Mark II, 545F, 545FR, 545FX, 545FXAT, 545FXT, 545FXTAT, 545G Mark II, 545RX, 545RXT, 545RXTAT, 55, 55 Rancher, 550XP, 550XP Mark II, 550XPG, 550XPG Mark II, 555FRM, 555FX, 555FXT, 555RXT, 556, 560XP, 560XPG, 562XP, 562XPG, 565, 570, 570II, 572XP, 572XPG, 576XP, 576XP AutoTune, 576XPAutoTune, 590BFS, 590BTS, 592 XP, 592XP, 61, Automower 435X AWD, Automower 435XAWD, Automower 535 AWD, Automower 535AWD, K3600 MkII, K3600MkII, K650 Cut-n-Break, K6500 Ring, K6500Ring, K650Cut-n-Break, K7000 Ring, K7000Ring, K960 Ring, K960Ring, K970 Ring, K970 Ring III, K970Ring, K970RingIII, T540XP, T540XPII
Alternate Part Numbers:
503 22 04-01, 503220401
Product Specifications
| L&S Part No. | 503 22 04 01 |
|---|---|
| Manufacturer | Husqvarna |
| OEM No. | 503220401 |
| Unit of Sale | 1 |
| Applications | 135, 135E, 140E, 225 L, 225 LD, 225L, 225LD, 225R, 225RD, 225RJ, 227 L, 227 LD, 227L, 227LD, 227R, 227RD, 227RJ, 232R, 235FR, 235R, 235RII, 240RBD, 240RJ, 268, 340, 340E, 343F, 343FR, 343R, 345, 345E, 345FR, 345FX, 345FXT, 345R, 345RX, 346XP, 350, 351, 353, 355FRM, 355FX, 355FXT, 355RX, 356BF, 356BT, 357XP, 359, 371K, 372XP, 375K, 435, 435E, 435EII, 435II, 440E, 440EII, 440II, 445, 445E, 445EII, 445II, 450, 450E, 450EII, 455, 455 Rancher, 455 Rancher II, 455E, 455E Rancher II, 455ERancherII, 460, 461, 465 Rancher II, 465RancherII, 545, 545 Mark II, 545F, 545FR, 545FX, 545FXAT, 545FXT, 545FXTAT, 545G Mark II, 545RX, 545RXT, 545RXTAT, 55, 55 Rancher, 550XP, 550XP Mark II, 550XPG, 550XPG Mark II, 555FRM, 555FX, 555FXT, 555RXT, 556, 560XP, 560XPG, 562XP, 562XPG, 565, 570, 570II, 572XP, 572XPG, 576XP, 576XP AutoTune, 576XPAutoTune, 590BFS, 590BTS, 592 XP, 592XP, 61, Automower 435X AWD, Automower 435XAWD, Automower 535 AWD, Automower 535AWD, K3600 MkII, K3600MkII, K650 Cut-n-Break, K6500 Ring, K6500Ring, K650Cut-n-Break, K7000 Ring, K7000Ring, K960 Ring, K960Ring, K970 Ring, K970 Ring III, K970Ring, K970RingIII, T540XP, T540XPII |
| Machine Type | Chainsaws, Brushcutters, Disc Cutters, Lawn Tractors |
| Fits Brands | Husqvarna |
| Fits Models | 340 | 135 | K3600 MkII | K650 Cut-n-Break | K6500 RING | K960 Ring | K970 Ring | 135E | 140E | 268 | 340E | 345 | 345E | 346XP | 350 | 351 | 353 | 357XP | 359 | 372XP | 435 | 435E | 435EII | 435II | 440E | 440EII | 440II | 445 | 445E | 445EII | 445II | 450 | 450EII | 455E | 455E RANCHER II | 455 RANCHER | 455 RANCHER II | 460 | 461 | 465 RANCHER II | 545 | 55 | 55 RANCHER | 550XP, 550XPG | 556 | 560XP, 560XPG | 562XP, 562XPG | 565 | 570 | 570II | 572XP, 572XPG | 576XP | 61 | T540XP | T540XPII | 371K | 225R | 225RD | 225RJ | 227RD | 227R | 227RJ | 232R | 235FR | 235R | 235RII | 240RBD | 240RJ | 343F | 343FR | 343R | 345FR | 345FX | 345FXT | 345R | 345RX | 355FRM | 355FX | 355FXT | 355RX | 356BF | 356BT | 545FR | 545FX | 545FXAT | 545RX | 545RXT | 545RXTAT | 555FRM | 555FX | 555FXT | 555RXT | 545FXT | 545FXTAT | 225 L | 225 LD | 227 L | 227 LD | 592 XP | 550XP Mark II | K7000 Ring | Automower 435X AWD | Automower 535 AWD | 545 Mark II | 545G Mark II | 550XPG Mark II | 576XP AutoTune | K970 Ring III | 375K | 590BFS | 590BTS | 545F |
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