Description
Overview:
The Spline Screw IS-M5x20-12.9 is a genuine Stihl fastener used to secure critical components on professional chainsaws and cut-off saws. Made from high‐tensile alloy steel to strength class 12.9, it is designed to withstand high loads and vibration without loosening. The metric size M5 x 20 (5 mm diameter x 20 mm length) suits precise assemblies where a compact, strong fixing is required. Its internal spline drive allows positive engagement for reliable tightening and removal, helping protect threads and components. Suitable for demanding service on tools such as the MS651 and MS661, this OEM screw matches the original specification for consistent fit, torque, and performance. Stihl MPN: 90223991020.
Key Features:
- Genuine Stihl part for consistent fit and performance
- High‐tensile alloy steel, grade 12.9, for maximum strength and fatigue resistance
- M5 x 20 (5 mm x 20 mm) sizing for compact, precise assemblies
- Internal spline drive for secure torque transfer and reduced cam‐out
- Engineered for high‐vibration environments typical of chainsaws and cut-off saws
- Durable finish to help resist wear during installation and service
- Precision thread for repeatable torque and secure clamp load
- Direct replacement for OEM part number 90223991020
- Supports safe operation by maintaining component alignment and integrity
- Suitable for routine maintenance or like‐for‐like replacement
Typical Applications:
Used to fasten engine shrouds, handle frames, covers, and other assemblies on Stihl professional machines. Ideal wherever a strong M5 fixing is required in high‐vibration, high‐load areas, helping prevent loosening and preserving alignment. Common in servicing chainsaws on site or in the workshop, and for maintaining cut‐off saws used in construction and landscaping.
Also known as:
Internal spline screw, spline-drive screw, high‐tensile bolt, cap screw, machine screw, M5 x 20 fixing, IS screw, OEM fixing.
Fits Models:
MS 362, MS 362 C, MS 400 C, MS 500 i, MS 651, MS 661, MS 661 C, MS 881, TS 480 i, TS 500 i, TSA 300
Alternate Part Numbers:
9022-399-1020, 90223991020
Product Specifications
| L&S Part No. | 9022 399 1020 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 90223991020 |
| Unit of Sale | 1 |
| Applications | MS 362, MS 362 C, MS 400 C, MS 500 i, MS 651, MS 661, MS 661 C, MS 881, MS362, MS362C, MS400C, MS500i, MS651, MS661, MS661C, MS881, TS 480 i, TS 500 i, TS480i, TS500i, TSA 300, TSA300 |
| Machine Type | Chainsaws, Disc Cutters |
| Fits Brands | Stihl |
| Fits Models | MS362, MS362C | TS480i, TS500i | MS651 | MS661, MS661C | MS500i | MS400C | MS881 | TSA300 |
