Description
Overview:
This Genuine Husqvarna retaining nut is a small but critical fastener used to secure cutting attachments and related hardware on Husqvarna brushcutters. Built from durable steel with a corrosion‐resistant finish, it is designed to stay tight under vibration, helping your machine run safely and reliably. It suits a wide range of petrol and battery models, including the Husqvarna 124R and 125R. As a direct replacement, it matches the original specification for fit and function on compatible gearboxes and shafts. OEM No. 503 85 63‐01 and MPN 503856301 ensure you are fitting the correct part. Choose this genuine component when servicing heads, blades, and guards to maintain proper clamping force and extend the life of surrounding parts.
Key Features:
- Genuine Husqvarna part for assured compatibility and performance (OEM 503 85 63‐01; MPN 503856301)
- Self‐locking design resists loosening from vibration during heavy use
- Tough steel construction with protective finish for long service life
- Precise fit on matching Husqvarna brushcutter drive assemblies and gearboxes
- Helps maintain correct torque and clamping on blades and trimmer heads
- Straightforward to install and remove using standard hand tools
- Suitable for routine maintenance and complete attachment replacement
- Supports safe operation by keeping rotating parts securely fastened
- Widely used across legacy and current Husqvarna brushcutter ranges
- Reliable choice for professional, commercial, and domestic users
Typical Applications:
Securing metal brush blades, grass blades, and trimmer heads to the output shaft or gearbox. Used when fitting or replacing cutting attachments, spacers, and guards on Husqvarna brushcutters. Ideal during routine servicing, after impact events, or when restoring machines to original specification.
Also known as:
Nyloc nut, self‐locking nut, retaining nut, blade nut, arbor nut, spindle nut, fixing nut, fastening nut, LH nut (check specification for your machine).
Fits Models:
122R, 122RJ, 124R, 125R, 125RJ, 128LX, 128R, 128RJ, 129DJX, 129R, 129RJ, 133R, 223 L, 223 R, 223L, 223R, 224 L, 224L, 226R, 226RJ, 227R, 232L, 232R, 233R, 233RJ, 235FR, 235R, 235RII, 240RJ, 322L, 323 C, 323 E, 323 Ex, 323 L, 323 LD, 323C, 323E, 323EX, 323L, 323LD, 323R, 323RII, 323RJ, 323RJX, 324 L, 324 LDx, 324 LX, 324L, 324LDx, 324LX, 324RX, 325 LDx, 325 LXT, 325 Lx, 325CX, 325E X-Series, 325L, 325LDx, 325LXT, 325Lx, 325R, 325RDX, 325RJX, 325RX, 325RXT, 325iL, 325iR, 325iRJ, 326 C, 326 CX, 326 EX, 326 L, 326 LDx, 326 LS, 326 Lx, 326C, 326CX, 326E X-Series, 326EX, 326L, 326L X-Series, 326LDx, 326LS, 326Lx, 326R X-Series, 326RJX, 326RX, 327 LDx, 327 LS, 327 Lx, 327LDx, 327LS, 327Lx, 327RDX, 327RJX, 327RX, 520iLX, 520iRX, 524 L, 524 LK, 524L, 524LK, 524R, 525 LS Mark II, 525 LST Mark II, 525L, 525LK, 525LS, 525LS Mark II, 525LST, 525LST Mark II, 525RJD, 525RJX, 525RK, 525RS, 525RX, 525RX Mark II, 525RXT, 525RXT Mark II, 525RXTMarkII, 525iLK, 525iLST, 525iLXT, 525iRXT, 533RS, 535 LK, 535LK, 536 LiLX, 536LiLX, 536LiRX, BBC250PW, BC2125, BC2126, BC2128, BC2228, BCA850, BCZ260L, BCZ300L, BTR250PL, CC2126, CC2128, CSA850, GC2123, GC2125, GC2125C, GC2126C, GC2128C, GC2225, GC2225C, GR2026, GR2032, GR2036, GT2125, TA1100, TA850
Alternate Part Numbers:
537 35 35 02, 967 18 59 01, 967 68 93 01, 952 71 57 59, 537 04 85 04, 537 04 85 02, 967 14 69 01, 967 18 60 01, 967 68 92 01, 966 76 32 05, 537 04 85 01, 537 35 35 01, 967 30 17 02, 952 71 57 62, 952 71 57 64, 952 71 57 58, 967 30 08 01, 967 62 28 01, 952 71 57 52, 952 71 57 54, 537 04 85 03, 952 71 57 63, 967 19 33 01, 967 19 34 01, 545 10 34 35
Product Specifications
| L&S Part No. | 503 85 63 01 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 503856301 |
| Unit of Sale | 1 |
| Applications | 122R, 122RJ, 124R, 125R, 125RJ, 128LX, 128R, 128RJ, 129DJX, 129R, 129RJ, 133R, 223 L, 223 R, 223L, 223R, 224 L, 224L, 226R, 226RJ, 227R, 232L, 232R, 233R, 233RJ, 235FR, 235R, 235RII, 240RJ, 322L, 323 C, 323 E, 323 Ex, 323 L, 323 LD, 323C, 323E, 323EX, 323L, 323LD, 323R, 323RII, 323RJ, 323RJX, 324 L, 324 LDx, 324 LX, 324L, 324LDx, 324LX, 324RX, 325 LDx, 325 LXT, 325 Lx, 325CX, 325E X-Series, 325L, 325LDx, 325LXT, 325Lx, 325R, 325RDX, 325RJX, 325RX, 325RXT, 325iL, 325iR, 325iRJ, 326 C, 326 CX, 326 EX, 326 L, 326 LDx, 326 LS, 326 Lx, 326C, 326CX, 326E X-Series, 326EX, 326L, 326L X-Series, 326LDx, 326LS, 326Lx, 326R X-Series, 326RJX, 326RX, 327 LDx, 327 LS, 327 Lx, 327LDx, 327LS, 327Lx, 327RDX, 327RJX, 327RX, 520iLX, 520iRX, 524 L, 524 LK, 524L, 524LK, 524R, 525 LS Mark II, 525 LST Mark II, 525L, 525LK, 525LS, 525LS Mark II, 525LST, 525LST Mark II, 525RJD, 525RJX, 525RK, 525RS, 525RX, 525RX Mark II, 525RXT, 525RXT Mark II, 525RXTMarkII, 525iLK, 525iLST, 525iLXT, 525iRXT, 533RS, 535 LK, 535LK, 536 LiLX, 536LiLX, 536LiRX, BBC250PW, BC2125, BC2126, BC2128, BC2228, BCA850, BCZ260L, BCZ300L, BTR250PL, CC2126, CC2128, CSA850, GC2123, GC2125, GC2125C, GC2126C, GC2128C, GC2225, GC2225C, GR2026, GR2032, GR2036, GT2125, TA1100, TA850 |
| Machine Type | Brushcutters |
| Fits Brands | Husqvarna |
| Fits Models | 124R | 125R | 125RJ | 128R | 128RJ | 129R | 129RJ | 133R | 223 L | 223 R | 226R | 226RJ | 227R | 232R | 233R | 235RII | 240RJ | 323R | 323RII | 323RJ | 323RJX | 324RX | 325R | 325RDX | 325RJX | 325RX | 325RXT | 326RJX | 326RX | 327RDX | 327RJX | 327RX | 524R | 525L | 525LK | 525LS | 525LST | 525RJD | 525RJX | 525RK | 525RS | 525RX | 525RXT | 533RS | 536LiRX | 223 L | 224 L | 323 C | 323 E | 323 Ex | 323 L | 323 LD | 324 L | 324 LDx | 324 LX | 325 LDx | 325 Lx | 325 LXT | 326 C | 326 CX | 326 EX | 326 L | 326 LDx | 326 LS | 326 Lx | 327 LDx | 327 LS | 327 Lx | 524 L | 524 LK | 535 LK | 536 LiLX | 325iR | 325iRJ | 525iRXT | 536LiRX | 325iL | 520iLX | 520iRX | 525iLK | 525iLXT | 525iLST | 525 LS Mark II | 525 LST Mark II | 525RX Mark II | 525RXT Mark II | 122R | 122RJ | 128LX |
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