STIHL Spline Screw IS-M5x20-12.9 – High-Tensile OEM Fastener (9022 399 1020)

This genuine STIHL Spline Screw IS-M5x20-12.9 (OEM No. 9022 399 1020) is a high-strength fastener engineered for securing critical components on professional chainsaws and cut-off saws. Manufactured from high-tensile alloy steel to strength class 12.9, it is designed to withstand heavy loads and continuous vibration in demanding environments.

With a metric M5 x 20 size, this screw provides a precise and compact fixing solution for assemblies requiring maximum strength and reliability. The internal spline drive ensures secure tool engagement, reducing cam-out and enabling accurate torque application during installation and servicing.

Key Features

• Genuine STIHL OEM part for precise fit and performance
• OEM part number 9022 399 1020 (also 9022-399-1020)
• High-tensile alloy steel construction – strength class 12.9
• M5 x 20 mm size for compact, high-strength assemblies
• Internal spline drive for secure torque transfer
• Designed for high-vibration and high-load environments
• Durable finish for wear resistance during repeated servicing
• Precision threads for consistent tightening and clamp load

Designed for High-Load Fastening

This spline screw is engineered to maintain secure assemblies under extreme conditions, helping prevent loosening and ensuring consistent alignment of critical components during operation.

Durable OEM Construction

Manufactured to STIHL’s exact specifications, the screw offers exceptional strength, fatigue resistance and durability, making it ideal for professional-grade machinery.

Compatibility and Application

This fastener is used across a range of STIHL professional chainsaws and cut-off saws. It is commonly replaced during servicing or repairs where a high-strength M5 fixing is required.

Technical Specifications

Compatible Models

Fits STIHL models including:

MS 362, MS 362 C, MS 400 C, MS 500i, MS 651, MS 661, MS 661 C, MS 881, TS 480i, TS 500i, TSA 300.

Ideal For

• Professional chainsaw and cut-off saw maintenance
• Replacing high-strength fasteners in critical assemblies
• Securing engine covers, housings and structural components
• Workshop servicing and field repairs
• Maintaining safe and reliable machine operation

Best For

The STIHL Spline Screw IS-M5x20-12.9 is best for professional users who require a high-strength, OEM fastener for critical, high-load applications.

Why Choose the STIHL Spline Screw IS-M5x20-12.9?

Choosing a genuine STIHL high-tensile fastener ensures correct fit, strength and durability. It is essential for maintaining the integrity, safety and performance of professional-grade equipment.

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