Products Description
404-7 Sprocket Rim
High-Torque Rim Sprocket for .404" Pitch Chains
This 404-7 rim sprocket is a specialized drive component for high-displacement chainsaws. It is engineered with a .404" chain pitch and features 7 teeth. This specific configuration is chosen for the immense torque it provides, making it ideal for heavy-duty felling and milling applications found on professional powerheads . Designed as part of a two-piece system, this rim sprocket works with a splined clutch drum, allowing for easier and more cost-effective maintenance compared to one-piece spur sprockets .
Technical Profiles & Materials
Optimized for Torque – The 7-tooth design is engineered to provide maximum lugging torque, enabling professional saws to power through oversized timber and large logs with .404" pitch chains .
Two-Piece System – Utilizes a "floating rim" design that slides onto a splined clutch drum. This allows the rim to be replaced as a standalone component, saving cost and reducing waste .
Standard Spline Compatibility – Precision-engineered for standard 7-spline (SD7) clutch drums, which are commonly found on the largest professional saw platforms .
Industrial-Grade Durability – Constructed from high-strength, hardened steel to withstand the extreme heat, stress, and shock loads encountered in professional and industrial logging operations .
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Chain Pitch | .404" |
| 2 | Tooth Count | 7 |
| 3 | Spline Type | Standard 7 Spline (SD7) |
| 4 | Rim Style | Floating / Replaceable Rim |
| 5 | Outer Diameter (Approx.) | 38.7 mm |
| 6 | Inner Diameter (Approx.) | 22.5 mm |
| 7 | Thickness (Approx.) | 7.85 mm |
| 8 | Material | Hardened Steel |
Products Application
Heavy-Duty Felling
The 404-7 rim is the go-to sprocket for felling oversized timber in professional forestry, where the high-torque 7-tooth gear reduces chain speed but increases cutting force . Its floating rim design ensures the heavy .404" chain stays aligned with the bar groove for maximum efficiency .
Alaskan Sawmilling & Milling
Essential for milling operations where a .404" pitch chain is required to handle the constant load and abrasive conditions of cutting logs into lumber. The system's durability helps maintain consistent tension and power transfer during these extended cuts .
Classic Saw Restoration
A direct replacement for aging 070 and 090 series saws, allowing these classic powerhouses to operate with reliable modern drive components while preserving the saw's original character .
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: What is the advantage of a rim sprocket over a spur sprocket?
A:A rim sprocket is a two-piece system. The rim itself is replaceable, meaning you can change the worn sprocket without replacing the entire clutch drum, saving time and money. The floating design also helps the chain align better with the bar groove, reducing wear .
Q: How do I confirm this rim fits my chainsaw?
A: First, verify that your chain uses a .404" pitch. Next, check your existing clutch drum to ensure it uses a standard 7-spline (SD7) system. The spline is the part of the drum the rim slides onto. This 404-7 rim is designed for this common type of clutch drum .
Q: When should I replace my rim sprocket?
A: A rim sprocket should typically be replaced after the service life of two chains . Look for visible wear on the sprocket teeth. Worn teeth will be sharp, hooked, or reduced in size, which will damage a new chain and reduce cutting performance .
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