Products Description
ECHO SRM4605 Clutch Assembly | Heavy-Duty Centrifugal Clutch for ECHO Commercial Brush Cutters & Clearing Saws
Dual-Shoe Friction Clutch with High-Tensile Return Spring & Bonded Wear-Resistant Lining for SRM-4605, SRM-420ES, SRM-410ESU, PAS-4605, and Compatible Multi-Tool Powerheads
ECHO Chain saw SRM4605 Clutch
This centrifugal clutch assembly is engineered for the ECHO SRM4605 - a 45.6 cc commercial-grade brush cutter powerhead widely deployed in landscaping, municipal vegetation control, and forestry undergrowth management. The clutch engages automatically as engine RPM rises: the two C-shaped steel shoes expand outward against centrifugal spring tension, pressing the bonded friction lining against the clutch drum to transmit power to the cutting head.
Constructed with hardened alloy steel shoes and a heavy-duty coiled return spring, the assembly is designed for the sustained high-RPM duty cycles of professional clearing work - not intermittent homeowner trimming. The spring calibration ensures smooth engagement at factory-specified RPM, preventing the grab-and-stall or slip-and-burn that generic aftermarket clutches cause. Compatible across the ECHO SRM-410, SRM-420, SRM-4605, and PAS multi-tool series sharing the same clutch drum diameter and shoe profile.
Technical Profiles & Materials
Centrifugal Engagement: At idle, the return spring holds the shoes retracted - no power reaches the cutting head. As RPM climbs past the engagement threshold (~2,800–3,200 RPM), centrifugal force overcomes spring tension and the shoes press into the clutch drum. This automatic coupling means the operator doesn't manage a manual clutch lever; the cutting head stops when engine speed drops to idle and engages smoothly as throttle opens.
Bonded Friction Lining : Each shoe carries a high-friction, heat-resistant composite lining bonded to its outer arc. The material is formulated for dry engagement - no oil bath - and withstands the surface temperatures generated during prolonged full-throttle operation without glazing or delamination. A glazed lining slips; a delaminated one fragments. This lining compound maintains consistent friction coefficient across the clutch's service temperature range.
Technical Specifications
| ITEM | DETAILS |
| Type | Centrifugal Clutch Assembly - Dual Shoe |
| Application | ECHO SRM4605 / SRM-420ES / SRM-410ESU / PAS-4605 brush cutters & multi-tool powerheads, 45.6 cc 2-stroke engines / ECHO SRM4605 / SRM-420ES / SRM-410ESU / PAS-4605 |
| Code | 3501038 |
| Material | Hardened alloy steel shoes, bonded friction lining, high-tensile spring steel coil |
| Details explanation | 2-shoe centrifugal type. Engagement: ~2,800–3,200 RPM. Spring-calibrated OEM-spec. Direct bolt-on replacement. |
| Brand Name | SeaSummer |
| Operating Temp | −20 ~ +300 °C (lining surface) |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
ECHO Brush Cutters & Clearing Saws
Direct fit for the SRM4605 (45.6 cc) - one of ECHO's most widely used commercial brush cutter powerheads - as well as the SRM-420ES and SRM-410ESU models sharing the same clutch architecture. These machines drive nylon trimmer heads, steel blades, and clearing saw attachments for grass, brush, saplings, and light forestry clearance. The clutch must handle the inertial shock of a steel blade striking hidden obstacles - the hardened shoe steel prevents fracture and maintains concentricity after impact.
ECHO PAS Multi-Tool
Systems
The PAS (Pro Attachment Series) powerheads - PAS-4605, PAS-410, PAS-420 - use a modular shaft-coupling system to drive interchangeable attachments: string trimmers, hedge trimmers, pole pruners, edgers, cultivators, and blowers. A single powerhead with a reliable clutch services the entire attachment fleet. For municipal crews, golf course maintenance teams, and rental operators running PAS systems, stocking one clutch SKU keeps the whole attachment ecosystem operational.
Compatible Aftermarket Applications
The same clutch form factor fits a range of 40–50 cc displacement brush cutters and clearing saws sharing ECHO's dual-shoe drum interface dimensions. For independent repair shops and equipment dealers servicing mixed-brand 2-stroke outdoor power equipment, this clutch covers multiple machine generations with a single inventory item - reducing shelf complexity while maintaining OEM-calibrated engagement performance.
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
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FAQ
Q: Are you an impartial industrial components dealer or a direct China water pump factors factory?
A:We are a direct, ISO9001-certified engineering water pump components manufacturing facility and precision fluid-control factor manufacture exporter primarily based in China. We function our personal cleanroom injection molding bays, computerized ultrasonic welding arrays, computerized hydraulic stress check stations, and clean-room packaging lines, passing direct-factory wholesale price financial savings straight to your element procurement margins.
Q: Can your manufacturing unit furnish full certification forms for food-contact or consuming water compliance?
A: Yes, absolutely. For food, beverage, or scientific applications, our manufacturing unit makes use of one hundred percent virgin, un-recycled polypropylene resins accompanied by means of fabric traceability certificates. We mechanically furnish B2B purchasers with complete FDA compliance documentation, NSF-grade compound declarations, and RoHS/REACH chemical protection screening sheets to make certain clean clearance thru worldwide customs.
Q: Do you provide customization picks for distinctly corrosive fluids like sturdy acids or ozone?
A: Yes, we are a thoroughly succesful OEM/ODM supplier. For aggressive chemical or ozone environments, we can improve the 12x26.5mm valve configuration in our factory: substituting the general PP housing with top class PVDF (Fluoropolymer) and changing any steel springs with Hastelloy or whole springless gravity-ball architecture, making sure final chemical resistance.
Q: How do we impervious a pattern batch to execute computerized lifecycle and burst-pressure testing?
A: We relatively inspire complete laboratory contrast earlier than logging mass grant agreements. We can ship a pattern lot of 5-10 gadgets of our inventory 12x26.5mm take a look at valves for assessment (setup costs and DHL/FedEx air freight apply). Once the factors pass by your inner lifecycle verification and a formal wholesale quantity manufacturing contract or container run is locked in, the sampling charges are a hundred percent credited returned to your industrial balance.
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