{"product_id":"gt2-pulley-20t-16t-aluminum-5mm-635mm-8mm-bore-10mm-timing-belt","title":"20T\/16T GT2 Gear 5mm\/6.35mm\/8mm Pulley Aluminum for 3D Printer 10mm Timing Belt","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGT2 Aluminum Timing Pulley — Precision Motion Control for 3D Printers \u0026amp; CNC Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your 3D printer or CNC router loses positional accuracy, the culprit is often a worn or mismatched timing pulley. Makers, engineers, and desktop fabricators who demand repeatable, backlash-free motion need a pulley that holds tight tolerances across thousands of cycles. These GT2 aluminum timing pulleys are designed for exactly that use case — drop-in replacements or new-build components that keep your motion system running true.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, offering a lightweight yet rigid body that resists deformation under belt tension. Available in 20-tooth (20T) and 16-tooth (16T) configurations, with bore options of 5mm, 6.35mm (1\/4 inch), and 8mm to match common stepper motor shaft diameters. The pulley width is sized for standard 10mm GT2 timing belts, with an outer diameter typically in the 15–17mm range depending on tooth count.\u003c\/p\u003e\n\u003cp\u003eTypical applications include Cartesian and CoreXY 3D printer X\/Y axis drives, CNC router gantry systems requiring precise belt-driven positioning, and lightweight robotics or automation rigs where stepper motor torque must be translated cleanly to linear motion via GT2 belt and pulley systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard 10mm-wide GT2 open or closed timing belts. Bore sizes 5mm, 6.35mm, and 8mm suit most NEMA 17 and NEMA 23 stepper motor shafts. Verify your motor shaft diameter before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These GT2 Aluminum Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003e20T \u0026amp; 16T Options\u003c\/strong\u003e\n\u003cp\u003eChoose 20-tooth for standard GT2 drive ratios or 16-tooth for higher resolution and finer micro-stepping — both machined to GT2 tooth profile spec for accurate belt engagement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eThree Bore Sizes\u003c\/strong\u003e\n\u003cp\u003eAvailable in 5mm, 6.35mm (1\/4\"), and 8mm bore diameters to fit the most common stepper motor shaft sizes used in desktop 3D printers and CNC machines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🪶\u003c\/div\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum body keeps rotating mass low, reducing inertia for faster acceleration and deceleration — critical for high-speed 3D printing and responsive CNC moves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e10mm Belt Width Compatibility\u003c\/strong\u003e\n\u003cp\u003eDesigned specifically for 10mm-wide GT2 timing belts, the most widely used belt width in desktop motion systems. No adapters or spacers required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eSet Screw Retention\u003c\/strong\u003e\n\u003cp\u003eIncludes set screw(s) for secure shaft clamping, preventing slippage under load and maintaining positional accuracy during extended print or cutting sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eMulti-Pack Value Options\u003c\/strong\u003e\n\u003cp\u003eAvailable as 1pc, 2pcs, or 5pcs per order — stock up for multi-axis builds, spare parts inventory, or workshop kits without overpaying for single-unit pricing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — GT2 Aluminum Timing Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e16T or 20T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eGT2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5mm \/ 6.35mm \/ 8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange\u003c\/th\u003e\n\u003ctd\u003eFlanged (standard GT2 pulley profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRetention\u003c\/th\u003e\n\u003ctd\u003eSet screw(s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eGT2 (2mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural aluminum \/ anodized (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1pc \/ 2pcs \/ 5pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between 20T and 16T pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio and linear resolution. A 20-tooth GT2 pulley moves the belt 40mm per motor revolution (20 teeth × 2mm pitch), while a 16-tooth pulley moves 32mm per revolution. Fewer teeth = finer resolution per step, which can improve print detail or CNC accuracy at the cost of slightly lower top speed. Most standard 3D printer builds use 20T; choose 16T if you want higher positional resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I choose for my stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your stepper motor's output shaft diameter before ordering. NEMA 17 motors typically have a 5mm shaft. Some NEMA 17 and most NEMA 23 motors use 6.35mm (1\/4\") or 8mm shafts. If you are unsure, check your motor's datasheet or use a caliper to measure the shaft directly. A bore that is too large will not clamp securely even with the set screw tightened.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley fit my existing GT2 timing belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these pulleys are machined to the GT2 tooth profile (2mm pitch) and are designed for 10mm-wide GT2 belts, which is the standard width used in most Cartesian and CoreXY 3D printers. If your belt is a different width (e.g., 6mm), this pulley will not be the correct fit. Always confirm your belt width before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum pulley under continuous belt tension?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy provides a good balance of strength and low weight for typical desktop 3D printer and light CNC applications. Under normal GT2 belt tension (typically 5–15N for desktop systems), aluminum pulleys perform reliably over extended use. For heavy-duty industrial applications with very high belt tension, a steel pulley may be more appropriate. For the vast majority of maker and desktop fabrication use cases, aluminum is the standard and preferred choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For standard 3D printing and CNC workshop use, this is more than sufficient. If your application involves exposure to moisture, cutting fluids, or harsh chemicals, consider applying a light protective coating or selecting an anodized variant where available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley in a CoreXY or H-bot printer build?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. GT2 20T pulleys are the most common choice for CoreXY and H-bot motion systems. The 10mm belt width variant is compatible with the belt routing used in popular open-source printer designs. Ensure you also have the correct idler pulleys (smooth bore, no teeth) for the non-driven belt path — this listing covers the driven (toothed) pulleys only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many pulleys do I need for a typical 3D printer?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA standard Cartesian printer (e.g., Ender-style) uses 2 driven pulleys — one per axis (X and Y). A CoreXY printer typically uses 2 driven pulleys on the two motors. Ordering the 2pcs pack covers a single printer build; the 5pcs pack is ideal if you are building multiple machines or want spares on hand for maintenance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Tooth count, Bore size, and QTY above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20T \/ 5mm \/ 1pc","offer_id":52445103128850,"sku":"HLS597-0","price":12.24,"currency_code":"USD","in_stock":true},{"title":"20T \/ 5mm \/ 2pcs","offer_id":52445103161618,"sku":"HLS597-1","price":20.94,"currency_code":"USD","in_stock":true},{"title":"20T \/ 5mm \/ 5pcs","offer_id":52445103194386,"sku":"HLS597-2","price":46.84,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6.35mm \/ 1pc","offer_id":52445103227154,"sku":"HLS597-3","price":12.24,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6.35mm \/ 2pcs","offer_id":52445103259922,"sku":"HLS597-4","price":20.94,"currency_code":"USD","in_stock":true},{"title":"20T \/ 6.35mm \/ 5pcs","offer_id":52445103292690,"sku":"HLS597-5","price":46.84,"currency_code":"USD","in_stock":true},{"title":"20T \/ 8mm \/ 1pc","offer_id":52445103325458,"sku":"HLS597-6","price":12.24,"currency_code":"USD","in_stock":true},{"title":"20T \/ 8mm \/ 2pcs","offer_id":52445103358226,"sku":"HLS597-7","price":20.94,"currency_code":"USD","in_stock":true},{"title":"20T \/ 8mm \/ 5pcs","offer_id":52445103390994,"sku":"HLS597-8","price":46.84,"currency_code":"USD","in_stock":true},{"title":"16T \/ 5mm \/ 1pc","offer_id":52445103423762,"sku":"HLS597-9","price":12.24,"currency_code":"USD","in_stock":true},{"title":"16T \/ 5mm \/ 2pcs","offer_id":52445103456530,"sku":"HLS597-10","price":20.94,"currency_code":"USD","in_stock":true},{"title":"16T \/ 5mm \/ 5pcs","offer_id":52445103489298,"sku":"HLS597-11","price":46.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_28acbc1d-21f7-4cc9-bd7b-d5f5d8fa3634.jpg?v=1783571987","url":"https:\/\/homediyer.com\/products\/gt2-pulley-20t-16t-aluminum-5mm-635mm-8mm-bore-10mm-timing-belt","provider":"HomeDIYer","version":"1.0","type":"link"}