Products Description
FS450 Brush Cutter Trimmer Head Nut – M12 x 1.5mm Left-Hand Thread
Essential Fastening Component for STIHL FS450 & Compatible Brushcutters
The M12 x 1.5mm trimmer head nut is a critical fastening component used to secure cutting attachments on the STIHL FS450 and a wide range of compatible brushcutters. Featuring a left-hand thread (counterclockwise to tighten), this nut is designed to self-tighten during operation, preventing the cutting head or blade from loosening while in use. Available as a genuine STIHL OEM part or high-quality aftermarket alternative, this nut is essential for maintaining secure cutting attachment mounting and operator safety.
Technical Profiles & Materials
Precision M12 x 1.5mm Left-Hand Thread – The M12 x 1.5mm specification is the standard thread size for the FS450 and compatible brushcutter output shafts. The left-hand thread design ensures the nut self-tightens during operation, preventing the cutting attachment from loosening while in use. The mounting nut must be screwed on counterclockwise and tightened firmly with the shaft blocked .
OEM-Spec Replacement Fitment – Replaces STIHL OEM part number 4119 642 7600, confirmed for FS450 and compatible models. Available as genuine STIHL OEM parts or quality aftermarket alternatives .
Wide Model Compatibility – Confirmed compatible with an extensive range of STIHL brushcutters, including:
FS Series: FS160, FS180, FS220, FS240, FS280, FS300, FS310, FS350, FS360, FS400, FS410, FS450, FS460, FS480, FS490
Additional Models: FS220K, FS280K, FS450K, FS450KZ, FS450L, FS450Z, FS460C, FS461C
Durable Metal Construction – Manufactured from high-quality metal (stainless steel or alloy steel) with a hexagonal shape for secure fastening and long service life under demanding cutting conditions . Available in single units or multi-packs (e.g., 5-piece or 10-piece sets) for workshop and fleet maintenance .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Thread Size | M12 x 1.5mm |
| 2 | Thread Direction | Left-hand thread (counterclockwise to tighten) |
| 3 | OEM Part Number | 4119 642 7600 |
| 4 | Compatible Models | FS160, FS180, FS220, FS240, FS280, FS300, FS310, FS350, FS360, FS400, FS410, FS450, FS460, FS480, FS490, and variants |
| 5 | Material | Metal / Stainless Steel |
| 6 | Fastener Type | Hexagonal nut |
| 7 | Compatible Systems | STIHL AutoCut 46-2 (OEM 4003 710 2115, 4003 710 2189) |
| 8 | Installation | Counterclockwise tightening, shaft must be blocked |
| 9 | Unit of Sale | Single piece or multi-packs (5-piece, 10-piece) |
Products Application
Cutting Attachment Replacement
Direct replacement when the original mounting nut becomes worn, stripped, or lost. The nut secures the thrust washer (convex side up) and rider plate when mounting cutting attachments. The mounting nut is screwed on counterclockwise and tightened firmly with the shaft blocked .
Trimmer Head Installation
For AutoCut 46-2 trimmer head mounting, the M12 x 1.5mm left-hand thread nut is used to secure the head to the output shaft. The thread specification is confirmed for FS220, FS280, FS290, FS300, FS310, FS350, FS360, FS400, FS410, FS450, FS460, FS480, and FS490 models .
Metal Blade Mounting
When mounting metal cutting blades, the M12 x 1.5mm nut is used with the thrust washer and rider plate. The collar on the cutting attachment must locate in the mounting hole, and the thrust washer must be fitted with the convex side facing up .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
Trusted Partnership Power
YOUR PROFESSIONAL ONE-STOP SOURCE
FOR 10000+ OUALITY PARTS
Verified Factory Excellence
BACKED BY 200+ TRUSTED FACTORY PARTNERS
Production process
Quality control
Expo experience
Customer Reviews
FAQ
Q: How do I confirm this nut fits my FS450 brushcutter?
A:Check your machine model number on the identification plate. This nut is confirmed compatible with STIHL FS450 and a wide range of FS series models listed above. The OEM part number is 4119 642 7600. For AutoCut 46-2 compatibility, the OEM reference is 4003 710 2115 or 4003 710 2189 .
Q: What is the correct tightening direction for the FS450 mounting nut?
A: The nut has a left-hand thread. It should be screwed on counterclockwise with the shaft blocked. The STIHL FS450 manual specifies to block the shaft, screw the mounting nut counterclockwise onto the shaft, and tighten it firmly. If the mounting nut has become too loose, fit a new one .
Q: Is this nut compatible with the AutoCut 46-2 trimmer head?
A: Yes. The AutoCut 46-2 trimmer head uses an M12 x 1.5mm left-hand threaded mount, making this nut compatible with the AutoCut 46-2 system. The trimmer head is compatible with FS220, FS280, FS290, FS300, FS310, FS350, FS360, FS400, FS410, FS450, FS460, FS480, and FS490 models .
Hot Tags: brush cutter fs450 trimmer head nut m12x1.5mm, China brush cutter fs450 trimmer head nut m12x1.5mm suppliers
