{"product_id":"18v-21v-brushless-control-board-switch-for-dayi-2106-wrench","title":"18V 21V Brushless Control Board \u0026 Switch for Dayi 2106 Wrench","description":"\u003ch2\u003e18V\/21V Brushless Control Board \u0026amp; Switch — Compatible with Dayi 2106 Electric Wrench\u003c\/h2\u003e\n\u003cp\u003eKeep your Dayi 2106 brushless electric wrench running at peak performance with this direct-replacement control board and speed-control switch set. Each unit is tested before shipment to ensure reliable operation straight out of the box. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect-Fit Compatibility:\u003c\/strong\u003e Designed specifically for the Dayi 2106 brushless electric wrench (also functions as a general brushless sensorless angle grinder \/ polishing machine drive board).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Support:\u003c\/strong\u003e Operates on 18V (5S lithium pack, fully charged to 21V), 300W power output. Compatible with battery packs labelled 48V, 68V, 88V, 98V, or 128VF — these are all 18V-actual (5S2P \/ 5S3P lithium cells).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Board Size:\u003c\/strong\u003e 5.23 × 6.30 cm — a precise drop-in form factor for quick installation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePre-Tested Before Sale:\u003c\/strong\u003e Every board is functionally verified before packaging for your peace of mind.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eABS Construction:\u003c\/strong\u003e Durable housing material to withstand workshop conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eConnect all wires first.\u003c\/li\u003e\n  \u003cli\u003eFix the motor securely in position.\u003c\/li\u003e\n  \u003cli\u003eInstall the housing\/case and tighten all screws.\u003c\/li\u003e\n  \u003cli\u003eConfirm the square drive shaft rotates freely without binding.\u003c\/li\u003e\n  \u003cli\u003eConnect the power supply.\u003c\/li\u003e\n  \u003cli\u003ePress down the speed-control switch — ensure no loose components remain inside the shell before powering on to avoid buzzing alarms or board damage.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Brushless Control Board\u003c\/li\u003e\n  \u003cli\u003e1 × Speed-Control Switch\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18V (fully charged: 21V)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e300W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.23 × 6.30 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDayi 2106 Brushless Electric Wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Screen colour calibration and lighting conditions may cause slight colour differences between product images and the actual item.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which electric wrench models is this brushless control board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This brushless control board is specifically designed for the Dayi 2106 brushless electric wrench. It also works as a general-purpose sensorless brushless drive board for angle grinders and polishing machines running on an 18V (5S lithium) power system.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What battery voltage does this control board require?\u003c\/h4\u003e\n\u003cp\u003eA: The board operates on an actual 18V supply (5-cell series lithium pack, fully charged to 21V). Battery packs labelled 48V, 68V, 88V, 98V, or 128VF are all 18V-actual designs (5S2P or 5S3P configurations) and are fully compatible.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the control board tested before shipping?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Every control board and switch set is individually tested and verified to be in working order before it is packaged and shipped, ensuring you receive a fully functional replacement part.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What should I do to avoid damaging the new control board during installation?\u003c\/h4\u003e\n\u003cp\u003eA: Follow the installation sequence carefully: connect all wires → secure the motor → fit and close the housing → tighten all screws → confirm the drive shaft spins freely → then connect power and press the speed switch. Never power on the board while components are loose inside the shell, as this can cause alarm faults or board damage.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which electric wrench models is this brushless control board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This brushless control board is specifically designed for the Dayi 2106 brushless electric wrench. It also works as a general-purpose sensorless brushless drive board for angle grinders and polishing machines running on an 18V (5S lithium) power system.\"}}, {\"@type\": \"Question\", \"name\": \"What battery voltage does this control board require?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board operates on an actual 18V supply (5-cell series lithium pack, fully charged to 21V). 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