{"product_id":"gt2-aluminum-timing-belt-pulley-16-20-30-40t-6mm","title":"GT2 16\/20\/30\/40T Width 6mm Aluminum Timing Belt Pulley 5\/6.35\/8mm For 3D Printer","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGT2 Aluminum Timing Belt Pulley — Precise Motion Control for 3D Printers \u0026amp; CNC Machines\u003c\/h2\u003e\n\u003cp\u003eWhen your 3D printer skips steps or your CNC axis drifts, the culprit is often a worn or mismatched pulley. Engineers, makers, and repair technicians who demand repeatable, backlash-free motion need a pulley that holds its geometry under continuous load — and that's exactly what these GT2 aluminum timing belt pulleys are built for.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, delivering a lightweight yet rigid body that resists deformation under belt tension. The GT2 tooth profile (2mm pitch) mates cleanly with standard GT2 belts. Available in 16, 20, 30, and 40 tooth counts with a fixed 6mm belt width, bore diameters range from 3.17mm (~0.125 in) up to 12mm (~0.47 in) to suit a wide variety of motor shaft sizes. Heights vary by variant, typically 14–16mm for flanged versions.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include FDM 3D printer X\/Y axis drives (GT2 belt-driven Cartesian and CoreXY systems), desktop CNC router feed axes, and lightweight robotics joint actuators where a low-profile GT2 timing pulley replacement is needed without re-engineering the belt path.\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 GT2 open-loop and closed-loop timing belts with 6mm width and 2mm pitch. Verify your motor shaft diameter before ordering — bore options include 3.17mm, 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, and 12mm.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GT2 Aluminum Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eGT2 2mm Pitch Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eEngineered to the GT2 standard for zero-backlash engagement with GT2 timing belts, maintaining positional accuracy across thousands of cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪶\u003c\/span\u003e \u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum body keeps rotating mass low — critical for high-acceleration 3D printer axes — while providing the rigidity needed to resist belt-induced flex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eMultiple Tooth Counts: 16 \/ 20 \/ 30 \/ 36 \/ 40T\u003c\/strong\u003e\n\u003cp\u003eSelect the tooth count that matches your existing drive ratio. More teeth increase belt contact and reduce tooth load; fewer teeth tighten the drive ratio for faster axis travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Bore Range: 3.17mm – 12mm\u003c\/strong\u003e\n\u003cp\u003eCovers the most common stepper motor shaft diameters used in desktop 3D printers and CNC machines, including NEMA 17 (5mm), NEMA 23 (6.35mm \/ 8mm), and metric variants.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSingle or 5-Pack Packing Options\u003c\/strong\u003e\n\u003cp\u003eOrder one for a quick replacement or a 5-pack for a full machine build or spare parts inventory — both options available for every tooth\/bore combination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e \u003cstrong\u003e6mm Belt Width — Industry-Standard Fit\u003c\/strong\u003e\n\u003cp\u003eThe 6mm belt width is the dominant standard in desktop motion systems. These pulleys drop straight into existing belt paths without spacers or modifications.\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 Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eGT2 (2mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e16 \/ 20 \/ 30 \/ 36 \/ 40 (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e3.17 \/ 4 \/ 5 \/ 6 \/ 6.35 \/ 7 \/ 8 \/ 10 \/ 12mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Height\u003c\/th\u003e\n\u003ctd\u003eSee variant options (typically 14–16mm for flanged variants)\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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural machined aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eIncluded (M3, hex socket)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange\u003c\/th\u003e\n\u003ctd\u003eFlanged (belt-retaining rim on both sides)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pc or 5 pcs (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\u003eWhich tooth count should I choose for my 3D printer?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMost Cartesian and CoreXY 3D printers use 20-tooth GT2 pulleys on the motor shafts as the standard drive ratio. If you are replacing a worn pulley, match the tooth count of the original. If you are redesigning your drive system, a 20T pulley paired with a 2mm pitch belt gives approximately 40mm of belt travel per motor revolution — a common baseline for tuning steps\/mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I measure my motor shaft to select the correct bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUse a digital caliper to measure the shaft diameter at the point where the pulley will sit. NEMA 17 steppers typically have a 5mm shaft; NEMA 23 steppers commonly use 6.35mm (1\/4 inch) or 8mm shafts. If your shaft has a D-cut flat, measure across the round portion. The set screw will clamp onto the flat for a secure, non-slip fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with GT2 closed-loop belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The GT2 2mm pitch tooth profile on these pulleys is compatible with both open-loop GT2 timing belts and GT2 closed-loop belts, provided the belt width is 6mm. Do not use these pulleys with GT3 or HTD belts, as the tooth profiles are not interchangeable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill aluminum pulleys wear out faster than steel ones?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIn typical 3D printer and light CNC applications, aluminum pulleys offer a practical service life measured in thousands of operating hours. Aluminum is softer than steel, so pairing with a fiberglass-reinforced GT2 belt (rather than a plain rubber belt) reduces tooth wear. For heavy-duty industrial applications with continuous high-tension loads, a steel pulley may be more appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys come with set screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, an M3 hex socket set screw is included with each pulley. Tighten it against the motor shaft flat (D-cut) using a 1.5mm hex key. Apply a small amount of thread-locking compound if the pulley will be subject to vibration or frequent direction reversals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a 20T pulley on one axis and a 30T pulley on another?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, but you will need to recalibrate the steps\/mm for each axis independently in your firmware (e.g., Marlin, Klipper). A 30T pulley moves 60mm of belt per revolution versus 40mm for a 20T pulley at the same pitch, so the axes will have different motion ratios. This is intentional in some machine designs to achieve different speed or torque characteristics per axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the flanged and non-flanged variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll variants in this listing are flanged — they have a raised rim on both sides of the tooth section that keeps the GT2 belt centered on the pulley and prevents it from walking off during operation. This is the standard configuration for 3D printer and CNC drive pulleys. Non-flanged pulleys are typically used as idlers, not drive pulleys.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Number of Teeth, Bore Height, and Width \u0026amp; Packing Quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"30 \/ 5mm Bore \/ 6mm \u0026 1","offer_id":52444196667666,"sku":"KFCBJT00001x1","price":3.63,"currency_code":"USD","in_stock":true},{"title":"30 \/ 5mm Bore \/ 6mm \u0026 5","offer_id":52444196700434,"sku":"KFCBJT00001x5","price":11.66,"currency_code":"USD","in_stock":true},{"title":"40 \/ 12mm Bore \/ 6mm \u0026 1","offer_id":52444196733202,"sku":"KFCBJT00002x1","price":3.98,"currency_code":"USD","in_stock":true},{"title":"40 \/ 12mm Bore \/ 6mm \u0026 5","offer_id":52444196765970,"sku":"KFCBJT00002x5","price":13.53,"currency_code":"USD","in_stock":true},{"title":"40 \/ 6.35mm Bore \/ 6mm \u0026 1","offer_id":52444196798738,"sku":"KFCBJT00003x1","price":3.98,"currency_code":"USD","in_stock":true},{"title":"40 \/ 6.35mm Bore \/ 6mm \u0026 5","offer_id":52444196831506,"sku":"KFCBJT00003x5","price":13.53,"currency_code":"USD","in_stock":true},{"title":"20 \/ 7mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444196864274,"sku":"KFCBJT00004x1","price":1.75,"currency_code":"USD","in_stock":true},{"title":"20 \/ 7mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444196897042,"sku":"KFCBJT00004x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 6.35 Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444196929810,"sku":"KFCBJT00005x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 6.35 Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444196962578,"sku":"KFCBJT00005x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 4mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444196995346,"sku":"KFCBJT00007x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 4mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444197028114,"sku":"KFCBJT00007x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 3.17mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444197060882,"sku":"KFCBJT00008x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 3.17mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444197093650,"sku":"KFCBJT00008x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 6mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444197126418,"sku":"KFCBJT00009x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 6mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444197159186,"sku":"KFCBJT00009x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 5mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444197191954,"sku":"KFCBJT00010x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 5mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444197224722,"sku":"KFCBJT00010x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"16 \/ 6mm Bore 14mm Height \/ 6mm \u0026 1","offer_id":52444197257490,"sku":"KFCBJT00014x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"16 \/ 6mm Bore 14mm Height \/ 6mm \u0026 5","offer_id":52444197290258,"sku":"KFCBJT00014x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"20 \/ 8mm Bore 16mm Height \/ 6mm \u0026 1","offer_id":52444197323026,"sku":"KFCBJT00018x1","price":2.99,"currency_code":"USD","in_stock":true},{"title":"20 \/ 8mm Bore 16mm Height \/ 6mm \u0026 5","offer_id":52444197355794,"sku":"KFCBJT00018x5","price":7.06,"currency_code":"USD","in_stock":true},{"title":"36 \/ 5mm Bore \/ 6mm \u0026 1","offer_id":52444197388562,"sku":"KFCBJT00019x1","price":3.81,"currency_code":"USD","in_stock":true},{"title":"36 \/ 5mm Bore \/ 6mm \u0026 5","offer_id":52444197421330,"sku":"KFCBJT00019x5","price":12.72,"currency_code":"USD","in_stock":true},{"title":"30 \/ 8mm Bore \/ 6mm \u0026 1","offer_id":52444197454098,"sku":"KFCBJT00020x1","price":3.63,"currency_code":"USD","in_stock":true},{"title":"30 \/ 8mm Bore \/ 6mm \u0026 5","offer_id":52444197486866,"sku":"KFCBJT00020x5","price":11.83,"currency_code":"USD","in_stock":true},{"title":"36 \/ 8mm Bore \/ 6mm \u0026 1","offer_id":52444197519634,"sku":"KFCBJT00021x1","price":3.81,"currency_code":"USD","in_stock":true},{"title":"36 \/ 8mm Bore \/ 6mm \u0026 5","offer_id":52444197552402,"sku":"KFCBJT00021x5","price":12.54,"currency_code":"USD","in_stock":true},{"title":"40 \/ 10mm Bore \/ 6mm \u0026 1","offer_id":52444197585170,"sku":"KFCBJT00022x1","price":3.98,"currency_code":"USD","in_stock":true},{"title":"40 \/ 10mm Bore \/ 6mm \u0026 5","offer_id":52444197617938,"sku":"KFCBJT00022x5","price":13.53,"currency_code":"USD","in_stock":true},{"title":"40 \/ 8mm Bore \/ 6mm \u0026 1","offer_id":52444197650706,"sku":"KFCBJT00023x1","price":3.98,"currency_code":"USD","in_stock":true},{"title":"40 \/ 8mm Bore \/ 6mm \u0026 5","offer_id":52444197683474,"sku":"KFCBJT00023x5","price":13.53,"currency_code":"USD","in_stock":true},{"title":"40 \/ 5mm Bore \/ 6mm \u0026 1","offer_id":52444197716242,"sku":"KFCBJT00024x1","price":3.98,"currency_code":"USD","in_stock":true},{"title":"40 \/ 5mm Bore \/ 6mm \u0026 5","offer_id":52444197749010,"sku":"KFCBJT00024x5","price":13.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of7_bea40b36-59ba-408a-8093-0277ec6a145c.jpg?v=1783337639","url":"https:\/\/homediyer.com\/products\/gt2-aluminum-timing-belt-pulley-16-20-30-40t-6mm","provider":"HomeDIYer","version":"1.0","type":"link"}