{"product_id":"htd-3m-timing-belt-pulley-step-bore-4-25mm-20-120t-15mm-aluminum","title":"HTD 3M Timing Belt Pulley w\/ Step Bore 4 ~ 25mm 20-120T For 15mm Wide Aluminum","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD 3M Timing Belt Pulley — Step Bore Aluminum Drive Wheel for Precise Motion Control\u003c\/h2\u003e\n\u003cp\u003eSourcing an HTD 3M timing belt pulley that fits your exact shaft size without custom machining is a recurring challenge for 3D printer builders, CNC hobbyists, and automation engineers. This aluminum HTD 3M timing belt pulley with step bore covers bore diameters from 4 mm to 25 mm and tooth counts from 20T to 120T, giving you a direct drop-in solution for the most common 3M belt drive configurations.\u003c\/p\u003e\n\u003cp\u003eEach pulley is CNC-machined from aluminum alloy. The step-bore design provides a pre-machined bore that accepts shafts from 4 mm (0.16 in) to 25 mm (0.98 in) across the variant range. Tooth counts span 20T through 120T, and all variants are sized for 15 mm (0.59 in) wide HTD 3M belts. The HTD 3M pitch (3 mm, rounded tooth profile) delivers smooth, low-noise power transmission with minimal backlash.\u003c\/p\u003e\n\u003cp\u003eTypical applications include X\/Y axis drives in FDM 3D printers and laser cutters, stepper motor output pulleys in CNC routers and pick-and-place machines, and compact robotic joint drives where an aluminum HTD 3M pulley with a wide bore selection is required to match varied motor shaft diameters.\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 HTD 3M timing belts, 15 mm belt width. Confirm your shaft bore diameter and tooth count before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These HTD 3M 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\u003eAluminum Alloy Body\u003c\/strong\u003e\u003cbr\u003eLightweight aluminum construction keeps rotating inertia low, which is critical for responsive acceleration in 3D printer and CNC axis drives.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eStep Bore: 4–25 mm Range\u003c\/strong\u003e\u003cbr\u003ePre-machined step bore accommodates shaft diameters from 4 mm (0.16 in) to 25 mm (0.98 in), covering stepper motor shafts, servo shafts, and custom idler axles without additional machining.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e20T to 120T Tooth Count Options\u003c\/strong\u003e\u003cbr\u003eWide tooth count range lets you set the exact gear ratio and pitch diameter your drive requires — from compact 20T pulleys for tight spaces to large 120T wheels for high-reduction drives.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eHTD 3M Pitch Profile\u003c\/strong\u003e\u003cbr\u003eThe 3 mm pitch rounded tooth form provides positive engagement with HTD 3M belts, reducing slip and noise compared to trapezoidal tooth profiles at equivalent loads.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003e15 mm Belt Width Compatibility\u003c\/strong\u003e\u003cbr\u003eAll variants are sized for 15 mm wide HTD 3M belts, the most common width for desktop CNC and 3D printer drive systems.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eCNC-Machined for Consistent Fit\u003c\/strong\u003e\u003cbr\u003eMachined tooth profile and bore tolerances ensure repeatable fit on standard motor shafts and correct mesh with HTD 3M belts, minimizing vibration and positional error.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD 3M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003eHTD 3M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e20T – 120T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplicable Belt Width\u003c\/th\u003e\n\u003ctd\u003e15 mm\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\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eStep bore (pre-machined)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined\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 select the correct bore diameter for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or idler shaft diameter with a caliper. Choose the bore option that matches your shaft exactly. The step-bore design is pre-machined — no further boring is required. Available bores range from 4 mm to 25 mm across the variant range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tooth count should I choose?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTooth count determines the pitch diameter and the drive ratio between your motor and driven axis. A smaller tooth count (e.g., 20T) gives a smaller pulley diameter and higher belt speed per motor revolution. A larger tooth count (e.g., 120T) gives a larger diameter and is typically used on the driven side for speed reduction. Match your tooth count to your drive geometry and desired ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 or T3 belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This pulley is designed for the HTD 3M tooth profile (3 mm pitch, rounded tooth form). It is not interchangeable with GT2 (2 mm pitch) or T3 (trapezoidal 3 mm pitch) belts. Using a mismatched belt profile will result in poor engagement, noise, and accelerated wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs aluminum strong enough for CNC and 3D printer drives?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy is well-suited for the torque and speed levels typical of desktop CNC routers, 3D printers, and light automation equipment. For sustained high-torque or shock-load industrial applications, contact us to confirm suitability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley corrode in humid workshop environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe aluminum alloy body develops a natural oxide layer that provides moderate corrosion resistance in typical indoor workshop conditions. For prolonged exposure to moisture or chemicals, a light protective coating is recommended. The pulley is not rated for immersion or outdoor salt-spray environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley with a 10 mm or 20 mm wide belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll variants in this listing are sized for 15 mm wide HTD 3M belts. Using a narrower or wider belt will cause the belt to sit incorrectly on the pulley face, leading to tracking problems and reduced load capacity. If you need a different belt width, contact us to confirm availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between HTD 3M and standard 3M pitch pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHTD (High Torque Drive) 3M pulleys use a rounded tooth profile designed to reduce stress concentration and improve load distribution compared to trapezoidal (MXL, T-series) profiles at the same pitch. This results in smoother operation and longer belt life under moderate loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Models \u0026amp; Number of Teeth and Bore above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M - 20T \/ 4 mm \/ 15 mm","offer_id":52444129296658,"sku":"FAS067939x1","price":13.5,"currency_code":"USD","in_stock":true},{"title":"3M - 20T \/ 5 mm \/ 15 mm","offer_id":52444129329426,"sku":"FAS067940x1","price":12.08,"currency_code":"USD","in_stock":true},{"title":"3M - 20T \/ 6 mm \/ 15 mm","offer_id":52444129362194,"sku":"FAS067941x1","price":12.08,"currency_code":"USD","in_stock":true},{"title":"3M - 20T \/ 6.35 mm \/ 15 mm","offer_id":52444129394962,"sku":"FAS067942x1","price":12.08,"currency_code":"USD","in_stock":true},{"title":"3M - 20T \/ 7 mm \/ 15 mm","offer_id":52444129427730,"sku":"FAS067943x1","price":12.08,"currency_code":"USD","in_stock":true},{"title":"3M - 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