{"product_id":"srm225-string-trimmer-head-2pack","title":"SRM-225 String Trimmer Head - Fits Echo SRM-225, SRM-210, SRM-2100, SRM-200 - 2 Pack Ver. 2","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\u003eHigh-Capacity Dual-Line Spool:\u003c\/strong\u003e Specifically engineered to hold up to 20 feet of 0.095\" diameter line, providing extended run times for both residential landscaping and heavy-duty brush clearing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Bump-Feed Advancement:\u003c\/strong\u003e Features a balanced internal mechanism that ensures reliable line advancement with a light tap on the ground, minimizing line welding and jams even at high RPMs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpact-Resistant Structural Polymer:\u003c\/strong\u003e Manufactured from specialized glass-reinforced nylon to withstand high-velocity contact with rocks, curbs, and fence posts while maintaining structural integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Vibration Balanced Design:\u003c\/strong\u003e Centrifugally balanced to reduce engine and shaft vibration, leading to less operator hand fatigue and a longer lifespan for your trimmer's gear head bearings.\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 Speed Feed 400:\u003c\/strong\u003e 99944200907, 99944200907B, 99944200902, 99944200900\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis \"400\" series head is the standard professional choice for Echo and Shindaiwa 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-225, SRM-225i, SRM-210, SRM-2100, SRM-200, SRM-230, SRM-250, SRM-265, SRM-266.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho PAS Series:\u003c\/strong\u003e PAS-210, PAS-211, PAS-225, PAS-230, PAS-265, PAS-266.\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 Specification:\u003c\/strong\u003e Fits all straight-shaft models 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 Surface:\u003c\/strong\u003e The center knob has ground down from pavement contact to the point where the internal spring is visible or the line no longer advances correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCracked Outer Shell:\u003c\/strong\u003e Visible stress fractures or missing chunks 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 Failure:\u003c\/strong\u003e The internal eyelets no longer align with the loading arrows, or the twisting mechanism has become seized with dried sap and dirt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Eyelet Damage:\u003c\/strong\u003e The line exits are missing or have developed deep grooves, 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 is no longer balanced due to uneven wear, putting undue stress on the gear head and the trimmer's motor.\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 Remember, this head is \u003cstrong\u003eLeft-Hand Threaded\u003c\/strong\u003e. To tighten it onto the trimmer, you must turn the head \u003cstrong\u003eCounter-Clockwise\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock the Gear Head:\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 through the head until it is even on both sides, then twist the knob to wind.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Line 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":45371209810109,"sku":"AZ00287955","price":30.78,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00123225_1_12a23d0d-4e40-41a7-924d-a78eedf57f64.jpg?v=1762246294","url":"https:\/\/bluestarsparts.com\/products\/srm225-string-trimmer-head-2pack","provider":"BlueStars Parts","version":"1.0","type":"link"}