{"product_id":"srm225-string-trimmer-head-for-speed-feed","title":"SRM-225 String Trimmer Head - Fits Echo SRM-225, SRM-230, SRM-210, SRM-2100","description":"\u003ch2\u003eSRM-225 String Trimmer Head\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-Second \"Easy-Load\" Technology:\u003c\/strong\u003e The patented Speed-Feed 400 design allows you to reload the entire head with trimmer line in under 30 seconds without disassembling the housing or removing the spool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Line Bump Feed:\u003c\/strong\u003e Engineered for professional-grade reliability, providing instant line advancement with a light tap on the ground while the engine is at full throttle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced High-RPM Design:\u003c\/strong\u003e Factory-balanced to reduce centrifugal vibration, which minimizes wear on the gear head bearings and significantly reduces operator hand fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Metal Eyelets:\u003c\/strong\u003e Features high-durability metal line exits that resist friction-induced heat, preventing the nylon line from \"welding\" to the head during heavy trimming.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Impact Polymer Housing:\u003c\/strong\u003e Manufactured from specialized glass-reinforced nylon to withstand high-velocity impacts with rocks, curbs, and fence posts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho:\u003c\/strong\u003e 99944200907, 99944200908\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShindaiwa:\u003c\/strong\u003e 78890-21001, 28820-08001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther:\u003c\/strong\u003e X047000490, X047000491\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis \"400\" series head is the primary replacement for most professional-grade straight-shaft trimmers. Key compatible models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho SRM Series:\u003c\/strong\u003e SRM-210, SRM-225, SRM-225i, SRM-230, SRM-2100, SRM-2110, SRM-265, SRM-266.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho PAS Series (Pro Attachment):\u003c\/strong\u003e PAS-210, PAS-211, PAS-225, PAS-230, PAS-260.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShindaiwa T-Series:\u003c\/strong\u003e T195S, T220, T222, T230, T231, T242, T242X.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnical Fitment:\u003c\/strong\u003e Designed for straight-shaft trimmers utilizing the \u003cstrong\u003eM10 x 1.25 LHF\u003c\/strong\u003e (Left Hand Female) arbor thread.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorn-Through Bump Cap:\u003c\/strong\u003e The center knob has ground down from pavement contact to the point where the internal spring is exposed or it no longer triggers the line release.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCracked Outer Shell:\u003c\/strong\u003e Visible stress fractures in the black housing, which can cause the head to shatter or become dangerously unbalanced at high RPMs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoading Mechanism Jam:\u003c\/strong\u003e The internal eyelets no longer align with the arrows, or the twisting mechanism has become seized with dried sap and debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequent Line Snapping:\u003c\/strong\u003e The metal eyelets are missing or deeply grooved, causing the trimmer line to snap off inside the head repeatedly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcessive Vibration:\u003c\/strong\u003e The head has become structurally unsound or unevenly worn, putting undue stress on the gear head and drive shaft.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeft-Hand Threads:\u003c\/strong\u003e This head is \u003cstrong\u003eLeft-Hand Threaded\u003c\/strong\u003e. To install, turn the head \u003cstrong\u003eCounter-Clockwise\u003c\/strong\u003e onto the gear head shaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock the Shaft:\u003c\/strong\u003e Insert a small hex key or the factory locking pin into the gear head hole to hold the shaft stationary while you spin the old head off and the new one on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Loading Arrow:\u003c\/strong\u003e To reload, rotate the top knob until the arrows on the knob align perfectly with the metal eyelets. Push your line straight through the head until it is even on both sides, then twist the knob to wind.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Diameter:\u003c\/strong\u003e For the SRM-225, \u003cstrong\u003e0.095\" line\u003c\/strong\u003e provides the best balance of durability and cutting power without over-stressing the engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoak Your Line:\u003c\/strong\u003e To extend the life of your trimmer line, soak it in water for 24 hours. Hydrated nylon is much more flexible and significantly less likely to snap at the eyelet during heavy use.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45371210072253,"sku":"AZ00426119","price":16.74,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00471138_1.jpg?v=1757320340","url":"https:\/\/bluestarspartstrend.com\/products\/srm225-string-trimmer-head-for-speed-feed","provider":"BlueStars Parts","version":"1.0","type":"link"}