Description
Overview:
The Screw-Active Exhaust is a replacement exhaust fixing screw for Husqvarna two-stroke machines, used to secure the muffler/exhaust assembly to the engine. It is a robust steel fastener with a protective finish suited to the heat, vibration, and corrosive conditions around small engine exhausts. By keeping the silencer firmly seated, it supports performance, noise control, and safe operation. Designed to match the original specification for a correct fit, it is suitable for a wide range of Husqvarna brushcutters, trimmers, and backpack blowers, including the 124R and 125R. Ideal for routine maintenance or repairs where an exhaust screw is missing, worn, or stripped. Manufacturer reference: 503 20 02 45 (503200245).
Key Features:
- Secure hold for exhaust components under high vibration
- Heat- and corrosion-resistant finish for longer service life
- Precise thread and head profile for consistent, repeatable tightening
- Matches original specification for alignment and sealing of the muffler
- Straightforward to fit with standard workshop tools
- Helps prevent exhaust leaks, loss of power, and excess noise
- Suitable for replacing damaged or fatigued fasteners during servicing
- Wide model coverage across Husqvarna brushcutters, trimmers, and blowers
Typical Applications:
Used when refitting a muffler after servicing, replacing a missing or damaged exhaust fastener, resolving exhaust leaks, or securing the silencer following vibration-related loosening. Suitable for routine maintenance on professional and domestic Husqvarna brushcutters, line trimmers, and backpack blowers working in gardening, landscaping, grounds maintenance, forestry, and site clearance.
Also known as:
Muffler bolt, silencer screw, exhaust mounting screw, exhaust retaining screw, muffler fastener, silencer fixing bolt, exhaust attachment screw.
Fits Models:
122R, 124R, 125R, 128R, 129R, 130BTs, 135R, 150BF, 150BT, 170BF, 170BT, 180BF, 180BT, 240, 241R, 241RJ, 245, 323C, 323L, 323LD, 323R, 323RII, 324RX, 325LXT, 325RDX, 325RX, 325RXT, 326AI25, 326C, 326CX, 326L, 326LDx, 326Lx, 326RX, 327RX, 333R, 335FR, 335R, 335RX, 336FR, 336FRD, 336RK, 343F, 343FR, 343FRM, 343R, 345FR, 345FX, 345FXT, 345R, 345RX, 350BF, 350BT, 355FRM, 355FX, 355FXT, 355RX, 356BF, 356BT, 360BT, 370BFS, 370BTS, 380BFS, 380BTS, 520iRX, 524R, 530BT, 535LS, 535RJ, 535RX, 535RXT, 536LiR, 536LiRX, 545F, 545FR, 545FX, 545FXAT, 545FXT, 545FXTAT, 545RX, 545RXT, 545RXTAT, 555FRM, 555FX, 555FXT, 555RXT, 560BFS, 560BTS, 570BFS, 570BTS, 580BFS, 580BTS
Alternate Part Numbers:
503 20 02-45, 503200245
Product Specifications
| L&S Part No. | 503 20 02 45 |
|---|---|
| Manufacturer | Husqvarna |
| OEM No. | 503200245 |
| Unit of Sale | 1 |
| Applications | 122R, 124R, 125R, 128R, 129R, 130BTs, 135R, 150BF, 150BT, 170BF, 170BT, 180BF, 180BT, 240, 241R, 241RJ, 245, 323 C, 323 L, 323 LD, 323C, 323L, 323LD, 323R, 323RII, 324RX, 325 LXT, 325LXT, 325RDX, 325RX, 325RXT, 326 AI 25, 326 C, 326 CX, 326 L, 326 LDx, 326 Lx, 326AI25, 326C, 326CX, 326L, 326LDx, 326Lx, 326RX, 327RX, 333R, 335FR, 335R, 335RX, 336FR, 336FRD, 336RK, 343F, 343FR, 343FRM, 343R, 345FR, 345FX, 345FXT, 345R, 345RX, 350BF, 350BT, 355FRM, 355FX, 355FXT, 355RX, 356BF, 356BT, 360BT, 370BFS, 370BTS, 380BFS, 380BTS, 520iRX, 524R, 530BT, 535LS, 535RJ, 535RX, 535RXT, 536LiR, 536LiRX, 545F, 545FR, 545FX, 545FXAT, 545FXT, 545FXTAT, 545RX, 545RXT, 545RXTAT, 555FRM, 555FX, 555FXT, 555RXT, 560BFS, 560BTS, 570BFS, 570BTS, 580BFS, 580BTS |
| Machine Type | Brushcutters |
| Fits Brands | Husqvarna |
| Fits Models | 124R | 125R | 128R | 129R | 135R | 240 | 241R | 241RJ | 245 | 323R | 323RII | 324RX | 325RDX | 325RX | 325RXT | 326RX | 327RX | 333R | 335FR | 335R | 335RX | 336FR | 336FRD, 336RK | 343F | 343FR | 343R | 345FR | 345FX | 345FXT | 345R | 345RX | 355FRM | 355FX | 355FXT | 355RX | 130BTs | 150BF | 150BT | 170BF | 170BT | 180BF | 180BT | 350BT | 356BF | 360BT | 370BFS | 370BTS | 380BFS | 380BTS | 530BT | 560BFS | 560BTS | 570BFS | 570BTS | 580BFS | 580BTS | 356BT | 524R | 535LS | 535RJ | 535RX | 535RXT | 536LiR | 536LiRX | 545FR | 545FX | 545FXAT | 545RX | 545RXT | 545RXTAT | 555FRM | 555FX | 555FXT | 555RXT | 545FXT | 545FXTAT | 323 C | 323 L | 323 LD | 325 LXT | 326 C | 326 CX | 326 L | 326 LDx | 326 Lx | 326 AI 25 | 536LiR | 536LiRX | 520iRX | 350BF | 545F | 343FRM | 122R |
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