{"product_id":"antminer-s21-plus-hydro-thermal-grease-stencil-stainless-hashboard-repair","title":"Antminer S21+ Hydro Thermal Grease Stencil – Stainless Steel with Positioning Frame","description":"\u003ch2\u003eAntminer S21+ (Plus) Hydro Thermal Grease Stencil – Stainless Steel Hashboard Application Tool with Black Positioning Frame\u003c\/h2\u003e\n\u003cp\u003eThis is a custom-designed \u003cstrong\u003ethermal grease stencil\u003c\/strong\u003e for the \u003cstrong\u003eAntminer S21+ (Plus) Hydro\u003c\/strong\u003e miner. Made from \u003cstrong\u003ehigh-hardness stainless steel\u003c\/strong\u003e and equipped with a \u003cstrong\u003ehigh-strength black positioning frame\u003c\/strong\u003e, the stencil aligns precisely on the S21+ Hydro hashboard so every ASIC chip receives an even, controlled bead of thermal grease in a single pass. It solves the chronic pain points of repair-bench grease application — \u003cstrong\u003euneven coverage, smearing onto neighbouring components, and chip-by-chip thickness variance\u003c\/strong\u003e — and is built for \u003cstrong\u003ehigh-volume mining farm refurbishment\u003c\/strong\u003e, hashboard chip replacement and water-cooling system maintenance.\u003c\/p\u003e\n\u003ch3\u003eWhy a Dedicated S21+ Hydro Stencil Beats Manual Application\u003c\/h3\u003e\n\u003cp\u003eManual grease application onto a hydro hashboard is the single biggest cause of post-repair temperature spikes: too thick on one chip, too thin on the next, smears that bridge to neighbouring components. The S21+ Hydro stencil enforces a uniform thermal interface across the entire chip array in a single squeegee pull, producing a flat, repeatable joint between the ASIC tops and the water-cooling plate. The result: \u003cstrong\u003ebetter heat transfer to the cooling loop, lower chip junction temperatures and a hash rate that holds at spec\u003c\/strong\u003e instead of throttling under thermal stress.\u003c\/p\u003e\n\u003ch3\u003eStainless Steel + Black Positioning Frame\u003c\/h3\u003e\n\u003cp\u003eThe stencil itself is made from \u003cstrong\u003ehigh-hardness stainless steel\u003c\/strong\u003e — corrosion-resistant against coolant residue and isopropyl-alcohol cleanups, and \u003cstrong\u003enot easily deformed\u003c\/strong\u003e by repeated handling or wash cycles. Aperture geometry stays sharp run after run, so the bead profile on chip number 200 looks exactly like the bead on chip number 1. The \u003cstrong\u003ehigh-strength black positioning frame\u003c\/strong\u003e is the real time-saver on a busy bench: it indexes the stencil onto the hashboard in seconds, locks it against shifting during the squeegee pull, and is forgiving enough that a junior technician can be productive on day one without ruining a board.\u003c\/p\u003e\n\u003ch3\u003eWhen to Use This Stencil\u003c\/h3\u003e\n\u003cp\u003eThree situations call for it on an S21+ Hydro: \u003cstrong\u003e(1) ASIC chip replacement\u003c\/strong\u003e on the hashboard after a failed unit is swapped out, \u003cstrong\u003e(2) water-cooling system maintenance\u003c\/strong\u003e when the cooling plate is removed for inspection, gasket service or coolant-line repair, and \u003cstrong\u003e(3) heat-dissipation optimisation\u003c\/strong\u003e when a unit is running hot from pump-out, dry-out or migration of the original grease layer. In all three, a fresh, uniform grease layer is what restores the original temperature delta and lets the miner hold its target hash rate.\u003c\/p\u003e\n\u003ch3\u003eApplication Workflow\u003c\/h3\u003e\n\u003cp\u003ePower off the miner and depressurise the cooling loop before disassembly. Strip the existing thermal compound from the hashboard chip tops and the water-cooling plate contact surface using isopropanol and a lint-free wipe. Lower the stencil's positioning frame onto the hashboard so the apertures register cleanly with the chip array, dispense your thermal grease across the surface, and pull in one steady motion with a flat scraper or squeegee. Lift the stencil straight up — do not slide — to leave even gel deposits on every chip. Lower the water-cooling plate straight down onto the chips and clamp at the recommended torque. Re-pressurise the loop, check for leaks, and only then re-energise.\u003c\/p\u003e\n\u003ch3\u003eImportant Notes — Compatibility, Storage \u0026amp; TIM Choice\u003c\/h3\u003e\n\u003cp\u003eThis stencil is \u003cstrong\u003ecompatible only with the Antminer S21+ (Plus) Hydro\u003c\/strong\u003e — the chip-pattern and water-plate footprint differ from the air-cooled S21+, the S21 Hydro and the S21 XP Hydro, so do not attempt to use it on those models. For best results, pair the stencil with a \u003cstrong\u003ehigh-conductivity thermal grease (≥6 W\/m·K is the standard recommendation for dense ASIC hashboards)\u003c\/strong\u003e; an 8 W\/mK silicone gel is the recommended class for this hashboard density. The stencil is a precision tool: \u003cstrong\u003ehandle without bending, store flat in a dry, dust-free environment\u003c\/strong\u003e, and clean residual gel off after every session to keep aperture geometry sharp.\u003c\/p\u003e\n\u003ch4\u003eAntminer S21+ Hydro Thermal Grease Stencil Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 6px 12px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eProduct\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eThermal Grease Stencil – Antminer S21+ Hydro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eMaterial (Stencil)\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eHigh-hardness stainless steel, corrosion-resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003ePositioning Frame\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eHigh-strength black frame — anti-shift, fast install\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCompatibility\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eAntminer S21+ (Plus) Hydro \u003cstrong\u003eonly\u003c\/strong\u003e — not for air-cooled S21+, S21 Hydro or S21 XP Hydro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eEven thermal grease deposit on hashboard ASIC chip array prior to water-cooling plate fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRecommended TIM\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eThermal grease ≥6 W\/m·K (8 W\/mK silicone gel preferred for hydro density)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eReusability\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eYes — opening precision maintained after repeated use; wash and dry between sessions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eUse Cases\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eHashboard chip replacement, water-cooling system maintenance, heat-dissipation optimisation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eTarget Users\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eRepair shops, mining farm bench technicians, hashboard refurbishment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eStorage\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eDry, dust-free, lay flat — avoid bending or sharp scratches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"text-align: left; padding: 6px 12px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eRelated Antminer S21+ Hydro Parts \u0026amp; Thermal Tools\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/bitmain-bm1370bc-asic-chip-antminer-s21pro-s21xp-s21hydro\"\u003eBM1370BC ASIC Chip – S21 Pro \/ S21 XP \/ S21+ \/ S21 Hydro\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-s21-hydro-miner-water-cooling-heatsink-plate-upgrade-miner-efficiency\"\u003eAntminer S21 Hydro Water Cooling Heatsink Plate\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/dowsil-8w-blue-thermal-gel-1kg-asic-miner-hashboards\"\u003eDOWSIL TC-3080 8W\/mK Blue Thermal Gel 1kg – Recommended TIM\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/antminer-s21-hydro-thermal-grease-fixture-precision-silicone-application-tool\"\u003eAntminer S21 Hydro Thermal Grease Fixture – Sister Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRefurbishing a fleet of S21+ Hydro miners? \u003ca href=\"mailto:contact@lys-sz.com\"\u003eContact us at contact@lys-sz.com\u003c\/a\u003e for stencil sets, positioning-frame spares and bulk thermal-grease pricing. Worldwide shipping from our Shenzhen warehouse.\u003c\/p\u003e","brand":"LYS Shenzhen","offers":[{"title":"Default Title","offer_id":45497795510451,"sku":null,"price":49.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/6710\/4179\/files\/antminer-s21-plus-hydro-thermal-grease-stencil-with-frame-front.webp?v=1778300592","url":"https:\/\/lys-sz.com\/products\/antminer-s21-plus-hydro-thermal-grease-stencil-stainless-hashboard-repair","provider":"LYS Shenzhen","version":"1.0","type":"link"}