{"product_id":"id-hq-series-armature-dw4120-4-5-angle-grinder-spare-part-makita-type-30385","title":"ID HQ SERIES ARMATURE [DW4120] [4.5\"] ANGLE GRINDER SPARE PART [Makita Type] - 30385","description":"\u003ch2\u003eRestore Full Power — The Precision Armature That Keeps Your Angle Grinder Running at Peak Performance\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eID HQ Series Armature for the DW4120 4.5\" Angle Grinder\u003c\/strong\u003e is a precision-engineered \u003cstrong\u003epower tool spare part\u003c\/strong\u003e designed as a direct replacement for \u003cstrong\u003eMakita-type angle grinder armatures\u003c\/strong\u003e. Featuring a \u003cstrong\u003ehigh-grade magnetic core\u003c\/strong\u003e, precision-wound copper coils, and a \u003cstrong\u003emachined commutator\u003c\/strong\u003e, this \u003cstrong\u003eangle grinder armature\u003c\/strong\u003e restores full motor performance and extends the working life of your tool. Identified by part reference \u003cstrong\u003e30385\u003c\/strong\u003e, it is the trusted choice for \u003cstrong\u003epower tool repair\u003c\/strong\u003e, maintenance workshops, and professional service technicians.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 24px 0;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 40%; text-align: left; padding: 10px 14px; background-color: #000000; font-size: 1em; color: #ffffff; border: 1px solid #e0e0e0;\"\u003eKey Features\u003c\/th\u003e\n\u003cth style=\"width: 40%; text-align: left; padding: 10px 14px; background-color: #000000; font-size: 1em; color: #ffffff; border: 1px solid #e0e0e0;\"\u003ePerfect For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 40%; vertical-align: top; text-align: left; padding: 10px 14px; border: 1px solid #e0e0e0;\"\u003e\n\u003cul style=\"margin: 0; padding-left: 18px;\"\u003e\n\u003cli\u003eDirect \u003cstrong\u003eMakita-type replacement armature\u003c\/strong\u003e for DW4120 4.5\" angle grinders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-performance magnetic core\u003c\/strong\u003e for efficient energy conversion and sustained power output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision copper winding\u003c\/strong\u003e ensures minimal resistance and reduced heat generation during operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined commutator\u003c\/strong\u003e for smooth brush contact and extended service intervals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable construction\u003c\/strong\u003e built to withstand heavy-duty grinding, cutting, and sanding cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 40%; vertical-align: top; text-align: left; padding: 10px 14px; border: 1px solid #e0e0e0;\"\u003e\n\u003cul style=\"margin: 0; padding-left: 18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower tool repair workshops\u003c\/strong\u003e servicing angle grinders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional technicians\u003c\/strong\u003e performing motor overhauls on Makita-type grinders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIY users\u003c\/strong\u003e seeking a cost-effective repair over full tool replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance teams\u003c\/strong\u003e in construction, fabrication, and metalworking industries\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMakita-Type Direct Fit (Part Ref: 30385):\u003c\/strong\u003e Engineered as a drop-in replacement for the \u003cstrong\u003eDW4120 4.5\" angle grinder\u003c\/strong\u003e, this armature matches the original OEM dimensions, shaft diameter, and commutator segment count — eliminating guesswork and reducing installation time for technicians and experienced DIY users alike.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Grade Magnetic Core Construction:\u003c\/strong\u003e The \u003cstrong\u003elaminated silicon steel core\u003c\/strong\u003e minimises eddy current losses, ensuring that electrical energy is efficiently converted into rotational mechanical energy. This results in stronger torque delivery, reduced motor temperature, and a noticeably more responsive grinder during demanding cutting and grinding tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Copper Winding for Thermal Stability:\u003c\/strong\u003e Each armature is wound with \u003cstrong\u003ehigh-conductivity copper wire\u003c\/strong\u003e, carefully layered to optimise current flow and distribute heat evenly across the winding. This reduces the risk of \u003cstrong\u003einsulation breakdown\u003c\/strong\u003e and premature failure, especially under sustained heavy-load operation common in metalworking and masonry applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined Commutator for Consistent Brush Contact:\u003c\/strong\u003e The \u003cstrong\u003eprecision-turned commutator\u003c\/strong\u003e provides a smooth, uniform surface for carbon brush contact, reducing arcing, brush wear, and electrical noise. A well-machined commutator is critical to the longevity of the entire motor assembly and helps maintain steady RPM under variable load conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHQ Series Build Quality — Engineered for Durability:\u003c\/strong\u003e Part of the \u003cstrong\u003eID HQ (High Quality) Series\u003c\/strong\u003e, this armature undergoes stricter manufacturing tolerances than standard aftermarket parts. The result is a spare component that performs closer to OEM specification, offering repairers and end users a reliable, long-lasting solution rather than a short-term fix.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis armature spare part is supplied as a tested replacement component and is compatible with \u003cstrong\u003eMakita-type 4.5\" angle grinder motors\u003c\/strong\u003e of the DW4120 configuration. It is packaged to prevent transit damage and arrives ready for installation by a competent technician or experienced user.\u003c\/p\u003e\n\u003c!-- CSS Styles for the FAQ Section --\u003e\n\u003cstyle\u003e\n.faq-section-styled {\n  font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n  margin-top: 40px;\n}\n.faq-section-styled h2 {\n  font-size: 2em;\n  font-weight: 700;\n  color: #1C2228;\n  border-bottom: 2px solid #F4F4F4;\n  padding-bottom: 15px;\n  margin-bottom: 30px;\n}\n.faq-section-styled details {\n  background-color: #f9f9f9;\n  border: 1px solid #e9e9e9;\n  border-radius: 8px;\n  margin-bottom: 15px;\n  overflow: hidden;\n}\n.faq-section-styled summary {\n  display: flex;\n  justify-content: space-between;\n  align-items: center;\n  padding: 20px;\n  font-weight: 600;\n  font-size: 1.1em;\n  color: #1C2228;\n  cursor: pointer;\n  list-style: none;\n}\n.faq-section-styled summary::-webkit-details-marker {\n  display: none;\n}\n.faq-section-styled .question-title {\n  display: flex;\n  align-items: center;\n}\n.faq-section-styled .question-title::before {\n  content: '\\25B6';\n  margin-right: 15px;\n  font-size: 0.8em;\n  color: #1C2228;\n}\n.faq-section-styled summary::after {\n  content: '+';\n  font-size: 1.8em;\n  font-weight: 300;\n  color: #1C2228;\n  transition: transform 0.2s ease-in-out;\n}\n.faq-section-styled details[open] summary::after {\n  transform: rotate(45deg);\n}\n.faq-section-styled .faq-answer-content {\n  background-color: #FFFFFF;\n  padding: 20px 20px 20px 55px;\n  border-top: 1px solid #e9e9e9;\n}\n.faq-section-styled .faq-answer-content p {\n  margin: 0;\n  font-size: 1em;\n  line-height: 1.7;\n  color: #2E2E2E;\n  text-align: left;\n}\n.faq-section-styled .faq-answer-content p strong {\n    color: #1C2228;\n}\n\u003c\/style\u003e\n\u003cdiv class=\"faq-section-styled\"\u003e\n\u003ch2\u003eGeneral Purchase \u0026amp; Comparison Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eIs this armature compatible with my angle grinder?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eThis armature is specifically designed for \u003cstrong\u003eMakita-type 4.5\" angle grinders\u003c\/strong\u003e of the \u003cstrong\u003eDW4120 configuration\u003c\/strong\u003e and is listed under part reference \u003cstrong\u003e30385\u003c\/strong\u003e. If your grinder shares this motor configuration, this is a direct-fit replacement. We recommend verifying your tool's model number and existing armature part number before purchasing to ensure full compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eHow does the ID HQ Series compare to a standard aftermarket armature?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eID HQ (High Quality) Series\u003c\/strong\u003e is manufactured to tighter tolerances than standard aftermarket spare parts. This means better dimensional accuracy, higher-grade copper winding, and a more precisely machined commutator — all of which translate to longer service life, more stable RPM under load, and a repair that holds up to professional use rather than needing replacement again in short order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eIs it more cost-effective to replace the armature or buy a new angle grinder?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eIn most cases, replacing the \u003cstrong\u003earmature spare part\u003c\/strong\u003e is significantly more economical than purchasing a new grinder, particularly for quality tools. The armature is one of the most common failure points in an angle grinder's motor, and a precision replacement from the \u003cstrong\u003eID HQ Series\u003c\/strong\u003e restores full performance at a fraction of the cost of a new unit — making it the preferred choice for workshops, tradespeople, and repair-minded users.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003ch2\u003eProduct-Specific and Usage Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhat does an armature do in an angle grinder?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eThe \u003cstrong\u003earmature\u003c\/strong\u003e is the rotating core of the angle grinder's electric motor. It consists of a \u003cstrong\u003elaminated magnetic core\u003c\/strong\u003e, \u003cstrong\u003ecopper windings\u003c\/strong\u003e, and a \u003cstrong\u003ecommutator\u003c\/strong\u003e. When electrical current passes through the windings, it interacts with the stator's magnetic field to generate rotation — converting electrical energy into the \u003cstrong\u003emechanical energy\u003c\/strong\u003e that drives the grinder's disc. A worn or burnt armature results in loss of power, excessive sparking, or complete motor failure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eCan I install this armature myself, or do I need a technician?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eArmature replacement requires \u003cstrong\u003edisassembly of the angle grinder motor housing\u003c\/strong\u003e, careful handling of the brush assembly, and correct reassembly to ensure safe operation. Experienced DIY users with familiarity in power tool repair can complete this task, but for best results — and to ensure the tool operates safely — we recommend installation by a \u003cstrong\u003equalified power tool repair technician\u003c\/strong\u003e. Always disconnect the tool from power before beginning any repair work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhat are the signs that my angle grinder armature needs replacing?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eCommon symptoms of a \u003cstrong\u003efailing or burnt armature\u003c\/strong\u003e include: a noticeable reduction in motor power or speed, excessive sparking from the brush area, a burning smell during operation, the tool failing to start despite a working power supply, or visible charring\/discolouration on the commutator segments. If your grinder displays any of these signs, the armature should be inspected and replaced as necessary to prevent further motor damage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003ch2\u003eProblem\/Solution-Oriented Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eMy angle grinder has lost power and sparks excessively — will a new armature fix this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003e\u003cstrong\u003eExcessive sparking and power loss\u003c\/strong\u003e are among the most common indicators of armature failure, often caused by worn commutator segments, shorted windings, or damaged insulation. In many cases, replacing the armature with a quality unit like this \u003cstrong\u003eID HQ Series DW4120 armature (Part Ref: 30385)\u003c\/strong\u003e will fully restore motor performance. However, it is also advisable to inspect the \u003cstrong\u003ecarbon brushes and stator\u003c\/strong\u003e at the same time, as prolonged running with a faulty armature can cause secondary wear to these components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eThe replacement armature I fitted previously failed quickly — what could cause this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003ePremature failure of a replacement armature is usually caused by one of the following: fitting a \u003cstrong\u003elow-quality aftermarket part\u003c\/strong\u003e with substandard winding or commutator finish; failing to replace \u003cstrong\u003eworn carbon brushes\u003c\/strong\u003e at the same time (worn brushes create uneven contact and accelerate commutator damage); or an underlying electrical fault such as a \u003cstrong\u003eshorted stator\u003c\/strong\u003e that continues to damage new armatures. The \u003cstrong\u003eID HQ Series\u003c\/strong\u003e addresses the quality aspect — but always pair a new armature with fresh brushes and a stator inspection for a complete, lasting repair.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eI can't find the exact part number for my grinder — how do I confirm this is the right armature?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eTo confirm compatibility, cross-reference the \u003cstrong\u003epart reference number 30385\u003c\/strong\u003e with your existing armature's label or your tool's service manual. Key physical checks include: \u003cstrong\u003eshaft diameter, overall armature length, commutator diameter, and number of commutator segments\u003c\/strong\u003e. If you are uncertain, please contact our team with your grinder's model number and we will help confirm whether this \u003cstrong\u003eDW4120 Makita-type armature\u003c\/strong\u003e is the correct fit before you purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Ideal Power Tools","offers":[{"title":"Default Title","offer_id":49792102695127,"sku":"30385","price":20.0,"currency_code":"AED","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/1962\/5687\/files\/IDHQSERIESARMATURE_DW4120_4.5INCH_ANGLEGRINDERSPAREPART_MakitaType_-30385.jpg?v=1789480300","url":"https:\/\/www.idealpowertools.com\/products\/id-hq-series-armature-dw4120-4-5-angle-grinder-spare-part-makita-type-30385","provider":"Ideal Power Tools","version":"1.0","type":"link"}