{"product_id":"ideal-armature-hq-series-gsh388-rotary-hammer-drill-spare-part-generic-bosch-type-26678","title":"ID HQ SERIES ARMATURE [GSH388] ROTARY HAMMER DRILL SPARE PART [Bosch Type] - 26678","description":"\u003c!-- ============================================================ --\u003e\u003c!-- PRODUCT DESCRIPTION: IDEAL ARMATURE HQ SERIES [GSH388] --\u003e\n\u003ch2 class=\"ideal-tagline\"\u003eEngineered to Perform. Built to Last. Restore Your Rotary Hammer to Full Power.\u003c\/h2\u003e\n\u003c!-- ============================================================ --\u003e\n\u003cstyle\u003e\n.ideal-pd {\nfont-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\ncolor: #2E2E2E;\nline-height: 1.7;\nfont-size: 1em;\n}\n.ideal-pd p { margin: 0 0 16px 0; }\n.ideal-pd h2 {\nfont-size: 1.6em;\nfont-weight: 700;\ncolor: #1C2228;\nmargin: 32px 0 16px 0;\nborder-bottom: 2px solid #F4F4F4;\npadding-bottom: 10px;\n}\n.ideal-pd h3 {\nfont-size: 1.15em;\nfont-weight: 700;\ncolor: #1C2228;\nmargin: 24px 0 10px 0;\n}\n.ideal-pd ul {\nmargin: 0 0 16px 0;\npadding-left: 20px;\n}\n.ideal-pd ul li { margin-bottom: 8px; }\n\n\/* ---- Feature Table ---- *\/\n.ideal-feature-table {\nwidth: 100%;\nborder-collapse: collapse;\nmargin: 20px 0 28px 0;\n}\n.ideal-feature-table th {\nbackground-color: #1C2228;\ncolor: #FFFFFF;\npadding: 12px 16px;\nfont-size: 1em;\nfont-weight: 700;\nwidth: 40%;\ntext-align: left;\nvertical-align: middle;\n}\n.ideal-feature-table th:last-child { width: 40%; }\n.ideal-feature-table td {\npadding: 10px 16px;\nborder: 1px solid #e9e9e9;\nvertical-align: top;\ntext-align: left;\nwidth: 40%;\n}\n.ideal-feature-table td:last-child { width: 40%; }\n.ideal-feature-table tr:nth-child(even) td { background-color: #f9f9f9; }\n\n\/* ---- Specs List ---- *\/\n.ideal-specs-list {\nmargin: 0 0 16px 0;\npadding-left: 20px;\n}\n.ideal-specs-list li { margin-bottom: 10px; }\n\n\/* ---- Tagline ---- *\/\n.ideal-tagline {\nfont-size: 1.6em;\nfont-weight: 700;\ncolor: #1C2228;\nmargin: 32px 0 16px 0;\nborder-bottom: 2px solid #F4F4F4;\npadding-bottom: 10px;\n}\n\n\/* ---- Certificates \u0026 Components Paragraph ---- *\/\n.ideal-cert-para {\nbackground-color: #f9f9f9;\nborder-left: 4px solid #1C2228;\npadding: 14px 18px;\nborder-radius: 4px;\nmargin: 16px 0 28px 0;\nfont-size: 0.97em;\ncolor: #2E2E2E;\n}\n\u003c\/style\u003e\n\u003cdiv class=\"ideal-pd\"\u003e\n\u003c!-- ===== SHORT DESCRIPTION ===== --\u003e\n\u003cp\u003eThe \u003cstrong\u003eIdeal Armature HQ Series [GSH388]\u003c\/strong\u003e is a \u003cstrong\u003ehigh-performance, generic replacement armature\u003c\/strong\u003e engineered to the \u003cstrong\u003eBosch GSH388 specification\u003c\/strong\u003e (Part No. 26678). Built with \u003cstrong\u003e100% pure copper windings\u003c\/strong\u003e and a \u003cstrong\u003eprecision multi-segment commutator\u003c\/strong\u003e, this \u003cstrong\u003eheavy-duty spare part\u003c\/strong\u003e restores full power and efficiency to your \u003cstrong\u003erotary hammer drill,\u003c\/strong\u003e delivering \u003cstrong\u003eindustrial-grade longevity\u003c\/strong\u003e at a fraction of OEM cost. Ideal for \u003cstrong\u003eprofessional repair technicians\u003c\/strong\u003e and \u003cstrong\u003eworkshop maintenance teams\u003c\/strong\u003e who demand reliable, cost-effective \u003cstrong\u003epower tool restoration\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c!-- ===== FEATURE TABLE ===== --\u003e\n\u003ctable class=\"ideal-feature-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eKey Features\u003c\/th\u003e\n\u003cth\u003ePerfect For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e100% Copper Windings\u003c\/strong\u003e — High-purity copper ensures maximum electrical conductivity and superior heat resistance under heavy-duty cycles\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eProfessional Power Tool Repair\u003c\/strong\u003e — Ideal for technicians servicing Bosch GSH388-type rotary hammer drills in workshops and on-site\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003ePrecision Multi-Segment Commutator\u003c\/strong\u003e — Engineered for smooth current transfer from carbon brushes, minimising sparking and brush wear\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eIndustrial Maintenance Programs\u003c\/strong\u003e — Perfect for facilities running scheduled preventive maintenance on heavy-duty drilling equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eResin-Coated, Laced Windings\u003c\/strong\u003e — Reinforced winding structure withstands the extreme centrifugal forces generated by professional-grade motors\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eCost-Effective Tool Restoration\u003c\/strong\u003e — A smart alternative to full tool replacement, extending the service life of existing equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eHeavy-Duty Magnetic Core\u003c\/strong\u003e — Precision-engineered magnetic core ensures efficient energy conversion from electrical to mechanical output\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eConstruction \u0026amp; Demolition Sites\u003c\/strong\u003e — Suited for environments where rotary hammer drills are subjected to continuous, high-load operation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eDrop-In Bosch-Type Compatibility\u003c\/strong\u003e — Manufactured to Bosch GSH388 dimensions (Part No. 26678) for a direct, hassle-free fitment\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eSpare Parts Stockists \u0026amp; Distributors\u003c\/strong\u003e — An essential stock item for power tool spare parts retailers serving the professional trades market\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- ===== TAGLINE + DETAILED SPECS ===== --\u003e\n\u003cul class=\"ideal-specs-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBosch GSH388 Direct-Fit Compatibility (Part No. 26678):\u003c\/strong\u003e This armature is manufactured to the precise dimensional and electrical specifications of the Bosch GSH388 rotary hammer drill, ensuring a \u003cstrong\u003edirect drop-in replacement\u003c\/strong\u003e with no modifications required. The shaft diameter, overall length, commutator segment count, and winding resistance are all matched to OEM tolerances, guaranteeing correct fitment and immediate operational readiness upon installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% High-Purity Copper Winding Construction:\u003c\/strong\u003e Unlike armatures wound with aluminium or copper-clad wire, the HQ Series uses \u003cstrong\u003esolid, high-purity copper conductors\u003c\/strong\u003e throughout the winding stack. Copper's superior electrical conductivity (approximately 59.6 × 10? S\/m) means lower resistive losses, less heat generation at equivalent load, and a significantly extended thermal lifespan — critical in the sustained, high-current draw environment of a rotary hammer motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Multi-Segment Copper Commutator with Minimal Runout:\u003c\/strong\u003e The commutator is machined from solid copper bar stock and features multiple segments with tight inter-segment insulation. This design ensures \u003cstrong\u003econsistent, low-resistance contact\u003c\/strong\u003e with the carbon brushes across the full rotation cycle, dramatically reducing electrical arcing, brush wear, and the associated carbon fouling that degrades motor performance over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResin-Impregnated and Laced Winding Structure for Centrifugal Stability:\u003c\/strong\u003e At the high RPM levels generated by professional rotary hammer motors, centrifugal forces place enormous stress on winding conductors. The HQ Series armature addresses this with a \u003cstrong\u003edual-protection system\u003c\/strong\u003e: the windings are first mechanically laced with high-tensile thread to lock conductors in place, then the entire assembly is vacuum-impregnated with a high-temperature thermosetting resin. This creates a rigid, monolithic winding block that resists vibration, moisture ingress, and thermal cycling fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Rotor Assembly for Vibration-Free Operation:\u003c\/strong\u003e Each armature in the HQ Series undergoes \u003cstrong\u003edynamic balancing\u003c\/strong\u003e of the rotor assembly. An unbalanced armature introduces destructive vibration into the tool's bearing set and gearbox, accelerating wear across multiple components simultaneously. By ensuring the rotating mass is correctly balanced, this armature protects the wider drivetrain and delivers the smooth, controlled power delivery that professional users depend on for precision drilling and chiselling work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial-Grade Laminated Core for Reduced Eddy Current Loss:\u003c\/strong\u003e The magnetic core is constructed from a stack of thin, electrically insulated silicon-steel laminations rather than a solid iron core. This \u003cstrong\u003elaminated architecture\u003c\/strong\u003e dramatically reduces eddy current losses — parasitic electrical currents induced within the core by the alternating magnetic field — converting more of the input electrical energy into useful mechanical torque and generating significantly less waste heat during operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ===== CERTIFICATES \u0026 COMPONENTS PARAGRAPH ===== --\u003e\n\u003c\/div\u003e\n\u003c!-- end .ideal-pd --\u003e\u003c!-- ============================================================ --\u003e\u003c!-- FAQ SECTION --\u003e\u003c!-- ============================================================ --\u003e\u003c!-- CSS Styles for the FAQ Section --\u003e\n\u003cstyle\u003e\n.faq-section-styled {\nfont-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\nmargin-top: 40px;\n}\n.faq-section-styled h2 {\nfont-size: 2em;\nfont-weight: 700;\ncolor: #1C2228;\nborder-bottom: 2px solid #F4F4F4;\npadding-bottom: 15px;\nmargin-bottom: 30px;\n}\n.faq-section-styled details {\nbackground-color: #f9f9f9;\nborder: 1px solid #e9e9e9;\nborder-radius: 8px;\nmargin-bottom: 15px;\noverflow: hidden;\n}\n.faq-section-styled summary {\ndisplay: flex;\njustify-content: space-between;\nalign-items: center;\npadding: 20px;\nfont-weight: 600;\nfont-size: 1.1em;\ncolor: #1C2228;\ncursor: pointer;\nlist-style: none;\n}\n.faq-section-styled summary::-webkit-details-marker {\ndisplay: none;\n}\n.faq-section-styled .question-title {\ndisplay: flex;\nalign-items: center;\n}\n.faq-section-styled .question-title::before {\ncontent: '\\25B6';\nmargin-right: 15px;\nfont-size: 0.8em;\ncolor: #1C2228;\n}\n.faq-section-styled summary::after {\ncontent: '+';\nfont-size: 1.8em;\nfont-weight: 300;\ncolor: #1C2228;\ntransition: transform 0.2s ease-in-out;\n}\n.faq-section-styled details[open] summary::after {\ntransform: rotate(45deg);\n}\n.faq-section-styled .faq-answer-content {\nbackground-color: #FFFFFF;\npadding: 20px 20px 20px 55px;\nborder-top: 1px solid #e9e9e9;\n}\n.faq-section-styled .faq-answer-content p {\nmargin: 0;\nfont-size: 1em;\nline-height: 1.7;\ncolor: #2E2E2E;\ntext-align: left;\n}\n.faq-section-styled .faq-answer-content p strong {\ncolor: #1C2228;\n}\n\u003c\/style\u003e\n\u003cdiv class=\"faq-section-styled\"\u003e\n\u003c!-- ===== SECTION 1: GENERAL PURCHASE \u0026 COMPARISON QUERIES ===== --\u003e\n\u003ch2\u003eGeneral Purchase \u0026amp; Comparison Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eIs this a genuine Bosch armature or a generic replacement?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ehigh-quality generic (aftermarket) replacement armature\u003c\/strong\u003e, not an original Bosch OEM part. It is engineered to the \u003cstrong\u003eBosch GSH388 specification\u003c\/strong\u003e (compatible with Part No. 26678) and manufactured to match OEM dimensions, winding resistance, and commutator geometry. The \u003cstrong\u003eIdeal HQ Series\u003c\/strong\u003e is designed to deliver equivalent or better performance than the original in terms of conductivity and durability, at a significantly more accessible price point — making it the preferred choice for professional repair workshops and cost-conscious maintenance teams.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhich specific Bosch rotary hammer models is this armature compatible with?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eThis armature is designed as a \u003cstrong\u003edirect replacement for Bosch GSH388-type rotary hammer drills\u003c\/strong\u003e, corresponding to \u003cstrong\u003eBosch spare part number 26678\u003c\/strong\u003e. If you are unsure whether your specific model is compatible, we recommend cross-referencing your tool's model number and the existing armature's part number before purchasing. You can also contact our team with your tool's model plate details and we will confirm compatibility for you.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhy should I choose an aftermarket armature over an OEM part?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eAftermarket armatures from the \u003cstrong\u003eIdeal HQ Series\u003c\/strong\u003e offer a compelling value proposition for professional users. The \u003cstrong\u003e100% copper winding construction\u003c\/strong\u003e and \u003cstrong\u003eresin-impregnated, laced winding structure\u003c\/strong\u003e are features that match or exceed the build quality of many OEM components. The primary advantage is \u003cstrong\u003ecost efficiency\u003c\/strong\u003e — you can restore a professional-grade rotary hammer to full working condition at a fraction of the cost of an OEM part or a tool replacement, without compromising on performance or longevity when the repair is carried out correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- ===== SECTION 2: PRODUCT-SPECIFIC AND USAGE QUERIES ===== --\u003e\n\u003ch2\u003eProduct-Specific and Usage Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhat is included in the package and what tools do I need for installation?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eEach order includes \u003cstrong\u003eone (1) complete HQ Series armature unit\u003c\/strong\u003e, comprising the fully wound and resin-impregnated rotor, the machined multi-segment copper commutator, and the precision-ground output shaft — everything needed for a direct installation. Installation requires standard power tool disassembly tools (typically a set of Torx and Phillips screwdrivers, snap-ring pliers, and a soft-faced mallet). \u003cstrong\u003eWe strongly recommend that armature replacement be carried out by a qualified power tool repair technician\u003c\/strong\u003e to ensure correct fitment and safe operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eWhy are 100% copper windings important in an armature?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003e\u003cstrong\u003eCopper is the benchmark conductor for electric motor windings\u003c\/strong\u003e due to its exceptional electrical conductivity — significantly higher than aluminium alternatives. In a rotary hammer armature, this translates directly to \u003cstrong\u003elower resistive losses\u003c\/strong\u003e, meaning more of the electrical energy drawn from the mains is converted into useful rotational torque rather than waste heat. This keeps the motor running cooler during sustained heavy-duty use, which is the single most important factor in determining the \u003cstrong\u003elong-term lifespan of the armature\u003c\/strong\u003e and the carbon brushes that contact it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eHow do I know if my rotary hammer's armature needs replacing?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eCommon symptoms of a failing armature in a rotary hammer drill include: \u003cstrong\u003esignificant loss of power or torque\u003c\/strong\u003e that cannot be attributed to worn carbon brushes; \u003cstrong\u003eexcessive sparking\u003c\/strong\u003e visible at the brush contact area during operation; a \u003cstrong\u003eburning smell\u003c\/strong\u003e emanating from the motor housing; the tool \u003cstrong\u003erunning intermittently or cutting out\u003c\/strong\u003e under load; or the motor \u003cstrong\u003efailing to start\u003c\/strong\u003e despite the brushes and power supply being confirmed as functional. If you observe any of these signs, a visual and electrical inspection of the armature — including a commutator continuity check — is the recommended next diagnostic step.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- ===== SECTION 3: PROBLEM\/SOLUTION-ORIENTED QUERIES ===== --\u003e\n\u003ch2\u003eProblem\/Solution-Oriented Queries\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eMy rotary hammer is producing excessive sparking — will replacing the armature fix this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eExcessive sparking at the brush contact zone is one of the most common indicators of \u003cstrong\u003ecommutator wear or damage\u003c\/strong\u003e. Over time, the commutator segments can become grooved, pitted, or contaminated with carbon deposits, preventing the brushes from making clean, consistent contact. The \u003cstrong\u003eIdeal HQ Series armature features a precision-machined, multi-segment copper commutator\u003c\/strong\u003e designed for smooth, low-resistance brush contact — directly addressing this root cause. However, it is also advisable to \u003cstrong\u003ereplace the carbon brushes simultaneously\u003c\/strong\u003e, as worn brushes on a new commutator will accelerate wear on the fresh surface. If sparking persists after replacement, the issue may lie with the field coil or power supply.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eMy rotary hammer is overheating during use — can a new armature resolve this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eOverheating in a rotary hammer motor is frequently caused by \u003cstrong\u003eincreased winding resistance due to partial winding failure or insulation breakdown\u003c\/strong\u003e in the armature. A degraded armature draws more current to produce the same output, generating excess heat in the process. Replacing it with the \u003cstrong\u003eIdeal HQ Series armature — with its high-purity copper windings and resin-impregnated insulation system\u003c\/strong\u003e — restores the motor to its correct electrical resistance profile, reducing current draw and heat generation. Additionally, ensure the tool's \u003cstrong\u003eventilation slots are clear of dust and debris\u003c\/strong\u003e, as blocked airflow is a common contributing factor to overheating independent of armature condition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cspan class=\"question-title\"\u003eThe tool runs but has lost significant power — is the armature likely the cause?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"faq-answer-content\"\u003e\n\u003cp\u003eA noticeable reduction in power output — where the tool runs but feels sluggish or struggles under load — can have several causes, but a \u003cstrong\u003epartially failed armature is a primary suspect\u003c\/strong\u003e. If one or more winding groups have developed an open circuit or a short to the core, the motor will continue to run on the remaining healthy windings but with \u003cstrong\u003ereduced torque and efficiency\u003c\/strong\u003e. Before replacing the armature, it is worth first ruling out \u003cstrong\u003eworn carbon brushes\u003c\/strong\u003e (a simpler and cheaper fix) and a \u003cstrong\u003efaulty field coil\u003c\/strong\u003e. If brushes are within service life and the field coil tests correctly, replacing the armature with the \u003cstrong\u003eIdeal HQ Series [GSH388]\u003c\/strong\u003e is the logical next step to restore full performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- end .faq-section-styled --\u003e","brand":"Ideal Power Tools","offers":[{"title":"Default Title","offer_id":46346331881687,"sku":"26678","price":40.0,"currency_code":"AED","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0714\/1962\/5687\/files\/MediumARMATUREProductIMG_8652b55d-06d9-4cd7-91be-0637423c672f.jpg?v=1756547351","url":"https:\/\/www.idealpowertools.com\/products\/ideal-armature-hq-series-gsh388-rotary-hammer-drill-spare-part-generic-bosch-type-26678","provider":"Ideal Power Tools","version":"1.0","type":"link"}