Products Description
Brush Cutter Gear Box Nut M10 x 1.25 – Left-Hand Thread Fastener
High-Strength Lock Nut for Brushcutter Cutting Attachments
This M10 x 1.25 nut is a critical fastening component designed to secure trimmer heads, grass blades, and other cutting attachments to the gearbox output shaft of brushcutters and trimmers. Featuring a left-hand thread that tightens counterclockwise, the nut is engineered to self-tighten during operation, preventing the cutting attachment from loosening under vibration and rotational forces . Manufactured from high-quality, wear-resistant metal, this nut ensures a secure, safe, and vibration-free connection for efficient grass and weed cutting.
Technical Profiles & Materials
Self-Locking Left-Hand Thread Design – The M10 x 1.25 left-hand thread (LH) is the industry standard for brushcutter gearbox output shafts . During operation, the counterclockwise rotation naturally tightens the nut, effectively preventing it from working loose due to vibration. This self-tightening action is a crucial safety feature that ensures the cutting attachment remains securely fixed, even at high speeds and under heavy loads.
Durable Metal Construction – Manufactured from premium-grade metal (often brass, steel, or hardened alloy) with a corrosion-resistant finish . This material ensures high hardness, strength, and long service life, even when exposed to fuel, oil, moisture, and abrasive grass and soil particles. The robust construction is designed to withstand the high-vibration, high-stress environment of professional brushcutter operation.
Precision M10 x 1.25 Thread Specification – The nut features a metric M10 thread with a fine 1.25mm pitch, which provides a secure, precise fit on compatible gearbox output shafts . The flange design creates a stable clamping surface that distributes pressure evenly across the cutting attachment, reducing the risk of warping or damage.
Universal Compatibility – Confirmed compatible with a wide range of brushcutters and trimmers featuring M10 x 1.25 left-hand thread gearbox outputs . Suitable for Chinese petrol brushcutters with 43–52cc engines and many other makes, including Alpina, Efco, Oleo-Mac, Stihl, Husqvarna, and Echo . The universal design ensures a perfect fit with original components .
Easy Installation – Simple replacement for old or damaged blade nuts using basic hand tools, typically a socket spanner or adjustable wrench . No special tools are required, making it a convenient accessory for both professionals and DIY users.
Versatile Application – Ideal for various brushcutter and trimmer accessories including trimmer heads, grass blades, shredder attachments, and other cutting tools . The nut is also suitable for lawnmowers and other garden machinery with M10 x 1.25 LH threads .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Thread Size | M10 x 1.25 mm |
| 2 | Thread Direction | Left-Hand (counterclockwise to tighten) |
| 3 | Nut Type | Self-locking / Flanged nut |
| 4 | Material | High-quality metal (brass/steel/hardened alloy) |
| 5 | Dimensions (Typical) | 22mm x 11mm / 0.87 x 0.43 inches |
| 6 | Approx. Weight | 17g / 0.6 oz |
| 7 | Finish | Corrosion-resistant satin or brass finish |
| 8 | Compatibility | Universal fit for M10 x 1.25 LH brushcutter gearboxes |
| 9 | Unit of Sale | 1 piece or multi-packs (2, 5, 8, 10 pieces) |
Products Application
Cutting Attachment Replacement
Direct replacement when installing new trimmer heads, grass blades, or brushcutter accessories. The left-hand thread design ensures the nut remains securely fastened during operation, preventing dangerous detachment of the cutting attachment . Replace the nut if it shows signs of wear, damage, or stripping to maintain safe and secure attachment mounting.
Workshop & Maintenance Service
For repair centers and professional landscapers servicing brushcutters, this nut is a standard replacement component for gearbox output shaft applications . The practical multi-packs allow workshops to keep spare nuts on hand, reducing downtime during repairs and routine maintenance .
Universal Compatibility
Suitable for most brushcutters and trimmers with M10 x 1.25 left-hand thread gearboxes. Compatible with Chinese 43–52cc models and many other brands including Alpina, Efco, Oleo-Mac, Stihl, Husqvarna, and Echo . The universal design ensures a perfect fit with original components and provides a cost-effective alternative to OEM parts .
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.
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FAQ
Q: How do I confirm this nut fits my brushcutter?
A:Check your brushcutter's gearbox output shaft thread size (M10 x 1.25) and direction (left-hand thread). This nut is compatible with most brushcutters and trimmers featuring this specification . Universal compatibility ensures a perfect fit with original components .
Q: What is the correct tightening direction for this nut?
A: The nut has a left-hand thread – turn counterclockwise to tighten . This design ensures the nut self-tightens during counterclockwise rotation, preventing loosening from vibration . To install, simply thread the nut onto the output shaft and tighten securely.
Q: Is this nut suitable for 43–52cc Chinese brushcutters?
A: Yes, this nut is confirmed compatible with Chinese petrol brushcutters with 43–52cc engines . It is also suitable for many other makes including Alpina, Efco, and Oleo-Mac models .
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