{"product_id":"gt2-timing-belt-pulley-20-teeth-5mm-8mm-bore-cnc-3d-printer","title":"GT2 Timing Belt Drive Pulley 20 Teeth Double-Headed Bore 5 mm 8 mm for CNC 3D","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGT2 Timing Belt Drive Pulley — Precise Motion Control for CNC \u0026amp; 3D Printers\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned pulley throws off your print layers or ruins a CNC cut, the root cause is almost always a poorly machined drive gear. Makers, engineers, and desktop fabricators who depend on repeatable motion need a GT2 pulley that holds its bore tolerance and tooth profile run after run.\u003c\/p\u003e\n\u003cp\u003eThis GT2 timing belt drive pulley features 20 teeth and a double-headed (flanged) design to keep the belt tracking straight. Available with a 5 mm or 8 mm bore to match the most common stepper motor shaft sizes. The pulley body is typically machined from aluminum alloy with a smooth anodized or natural finish, keeping rotating mass low while maintaining dimensional accuracy. Tooth pitch is the standard GT2 2 mm, compatible with 6 mm wide GT2 belts.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: replacing worn drive pulleys on Ender, Prusa, or Voron 3D printers; upgrading the X\/Y axis on DIY CNC routers and laser engravers; and building custom belt-driven linear motion systems where consistent tooth engagement is critical for positional accuracy.\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 GT2 2 mm pitch belts, 6 mm belt width — fits standard stepper motor shafts of 5 mm or 8 mm diameter. Suitable for Ender 3\/5, CR-10, Prusa i3 MK series, Voron, and most open-frame CNC\/laser platforms.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GT2 Timing Belt Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003e20-Tooth GT2 Profile\u003c\/strong\u003e\n\u003cp\u003eStandard 2 mm pitch tooth geometry delivers smooth, low-backlash power transmission and is interchangeable with GT2 belts across all major 3D printer and CNC platforms.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eDual Bore Options — 5 mm \u0026amp; 8 mm\u003c\/strong\u003e\n\u003cp\u003eChoose the bore that matches your stepper shaft. Both sizes are precision-bored to maintain concentricity and minimize runout during high-speed operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eDouble-Headed Flanged Design\u003c\/strong\u003e\n\u003cp\u003eRaised flanges on both sides of the pulley keep the GT2 belt centered on the tooth face, preventing lateral drift that causes layer shifts or missed steps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪶\u003c\/span\u003e \u003cstrong\u003eLightweight Aluminum Alloy Body\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum construction keeps rotational inertia low, allowing stepper motors to accelerate and decelerate quickly without losing steps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eSet Screw Shaft Lock\u003c\/strong\u003e\n\u003cp\u003eIncludes a set screw for secure shaft attachment. Tighten against the flat of the motor shaft for a slip-free connection that stays put under continuous use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eFlexible Pack Sizes — 1 to 20 PCS\u003c\/strong\u003e\n\u003cp\u003eOrder a single replacement or stock up with a multi-pack for builds, repairs, or workshop inventory. All pieces in a pack are matched to the same bore size and tooth count.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — GT2 Timing Belt Drive Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e20 Teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003eGT2 — 2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 mm or 8 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eDouble-Headed (Flanged)\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\u003eShaft Lock\u003c\/th\u003e\n\u003ctd\u003eSet Screw\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\u003eHub Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Size\u003c\/th\u003e\n\u003ctd\u003e1 \/ 5 \/ 10 \/ 15 \/ 20 PCS\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\u003eHow do I choose between the 5 mm and 8 mm bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bore to your stepper motor's output shaft diameter. Most NEMA 17 motors used in 3D printers have a 5 mm shaft. NEMA 23 motors commonly used in CNC routers typically have an 8 mm shaft. Check your motor's datasheet or measure the shaft with calipers before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley work with my GT2 belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — this pulley is machined to the GT2 2 mm pitch standard and is compatible with any GT2 belt that is 6 mm wide. It fits belts used on Ender 3, Ender 5, CR-10, Prusa i3 MK2\/MK3, Voron, and most open-source CNC and laser engraver designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does double-headed or flanged mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA double-headed pulley has raised flanges on both sides of the tooth face. These flanges prevent the belt from walking sideways off the pulley during operation, which is a common cause of layer shifts in 3D printers and positional errors in CNC machines. It is the recommended design for any open-loop belt drive system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set screw connection? Will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWhen properly tightened against the flat of the motor shaft using the correct hex key, the set screw provides a secure, slip-resistant connection suitable for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in typical 3D printing and light CNC applications. For best results, apply a small amount of thread-locking compound to the set screw threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the aluminum body resistant to corrosion?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy naturally forms a thin oxide layer that provides good resistance to moisture and mild environmental exposure. For indoor workshop or enclosed printer use, no additional treatment is needed. If used in a humid environment, a light coating of machine oil on the bore and hub area is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley to replace a worn one on my existing printer or CNC machine?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Select the bore size that matches your current motor shaft, loosen the existing set screw, slide out the old pulley, and install the new one. Re-tension your belt after installation and run a test print or dry-run to confirm alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I order a single piece or a multi-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIf you are replacing a single failed pulley, the 1 PCS option is sufficient. For a full printer or CNC build with multiple belt axes, the 5 or 10 PCS pack offers better value. Workshop owners and repair technicians often choose the 15 or 20 PCS pack to keep spares on hand for quick turnaround.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Teeth \/ Bore \/ Amount above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20 Teeth \/ 5 mm \/ 1 PCS","offer_id":52444363555090,"sku":"GYJLTBJT01771x1","price":2.04,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 8 mm \/ 1 PCS","offer_id":52444363587858,"sku":"GYJLTBJT01772x1","price":2.69,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 5 mm \/ 5 PCS","offer_id":52444363620626,"sku":"GYJLTBJT01771x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 8 mm \/ 5 PCS","offer_id":52444363653394,"sku":"GYJLTBJT01772x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 5 mm \/ 10 PCS","offer_id":52444363686162,"sku":"GYJLTBJT01771x10","price":12.13,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 8 mm \/ 10 PCS","offer_id":52444363718930,"sku":"GYJLTBJT01772x10","price":12.13,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 5 mm \/ 15 PCS","offer_id":52444363751698,"sku":"GYJLTBJT01771x15","price":17.75,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 8 mm \/ 15 PCS","offer_id":52444363784466,"sku":"GYJLTBJT01772x15","price":17.75,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 5 mm \/ 20 PCS","offer_id":52444363817234,"sku":"GYJLTBJT01771x20","price":23.35,"currency_code":"USD","in_stock":true},{"title":"20 Teeth \/ 8 mm \/ 20 PCS","offer_id":52444363850002,"sku":"GYJLTBJT01772x20","price":23.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture4of6_8e53b9d9-d74d-4ca2-a432-f091544e6e66.jpg?v=1783401540","url":"https:\/\/homediyer.com\/products\/gt2-timing-belt-pulley-20-teeth-5mm-8mm-bore-cnc-3d-printer","provider":"HomeDIYer","version":"1.0","type":"link"}