STIHL Collar Nut M14 x 1.5 LH

The STIHL Collar Nut M14 x 1.5 with left-hand thread is a genuine STIHL replacement fastener designed to securely retain cutting attachments on compatible STIHL brushcutters and clearing saws. Built from durable steel with a protective finish, this flanged collar nut is engineered to deliver dependable clamping force while resisting loosening under the high-speed rotation and vibration associated with professional vegetation cutting equipment.

Designed for use on rotating shaft assemblies, the left-hand thread matches the direction of rotation to help maintain secure attachment retention during use. Ideal for routine servicing, blade changes or replacing worn or missing hardware, this genuine STIHL collar nut helps restore safe, correct and reliable attachment mounting on compatible FS series machines.

Key Features

• Genuine STIHL collar nut for brushcutters and clearing saws
• M14 x 1.5 left-hand thread for correct OEM fitment
• Designed to secure cutting attachments to the gearbox output shaft
• Durable steel construction for long service life
• Protective finish for improved durability
• Collar / flanged face helps spread clamping load evenly
• Helps reduce marking of hubs and mounting components
• Left-hand thread helps resist loosening in service
• Hex profile for easy installation with a standard spanner
• Direct replacement for worn, damaged or missing original nut

Designed for Secure Cutting Attachment Retention

The STIHL Collar Nut M14 x 1.5 LH is designed to keep metal blades and compatible cutting attachments securely fixed to the machine during use. Its left-hand thread is specifically matched to the rotational forces generated during operation, helping maintain reliable retention under vibration and load.

Durable Construction for Professional Use

Manufactured from robust steel, this genuine STIHL blade retaining nut is designed to withstand the repeated stress and mechanical demand of professional brushcutting and clearing saw applications. The integrated collar face also helps distribute clamping pressure more evenly across the mounted components for a more stable and protective fit.

Compatibility and Application

This STIHL left-hand collar nut is typically used to secure blades or mowing heads to the gearbox spindle during blade changes, routine servicing and repair work. Also commonly referred to as a left-hand hex nut, blade retaining nut, flanged nut or arbor nut, it is a key replacement fastener for maintaining correct assembly and safe machine operation.

Technical Specifications

Compatible Models

Fits selected STIHL brushcutter and clearing saw models including:

FS 360, FS 360 C, FS 410 C, FS 420, FS 420 L, FS 490 C, FS 500, FS 510 C, FS 550, FS 550 L, FS 560 C.

Ideal For

• Securing brushcutter blades and cutting attachments
• Routine servicing and maintenance
• Replacing lost or worn attachment nuts
• Professional landscaping and grounds maintenance
• Forestry clearing and site preparation work

Best For

The STIHL Collar Nut M14 x 1.5 LH is best for users maintaining compatible STIHL brushcutters and clearing saws who need a genuine OEM fastener for safe and reliable cutting attachment retention.

Why Choose STIHL Collar Nut M14 x 1.5 LH?

Using a genuine STIHL collar nut helps ensure the correct thread, clamping force and secure fit required for high-speed cutting applications. It is a small but essential OEM part for maintaining safe operation and protecting the attachment system on your STIHL machine.

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