{"product_id":"3m-timing-belt-pulley-20t-40t-synchronous-drive-bore-5-15mm","title":"3M Timing Belt Tooth 20T-40T Synchronous Drive Pulley Width 11\/16mm Bore 5-15mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Synchronous Drive Pulley — Precision Motion for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned pulley derails your CNC router, 3D printer, or robotic arm mid-run, the cost is more than downtime — it's lost accuracy and wasted material. Engineers, makers, and automation builders who demand repeatable, zero-backlash motion need a synchronous drive pulley that locks onto the shaft and stays there. These 3M timing belt pulleys are engineered for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy and features a 3M tooth profile (3 mm pitch) compatible with standard 3M timing belts. Available in five tooth counts — 20T, 25T, 30T, 35T, and 40T — with bore diameters ranging from 5 mm (~0.197 in) to 15 mm (~0.591 in). Slot widths of 11 mm (~0.433 in) and 16 mm (~0.630 in) accommodate both narrow and wide belt configurations. BF-type pulleys include a flange on both sides for lateral belt retention; K-type pulleys feature a single-side flange for applications requiring belt removal without disassembly.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y axis drives where consistent tooth engagement prevents positioning drift, desktop 3D printer extruder and motion systems requiring lightweight yet rigid pulleys, and small-scale conveyor or pick-and-place automation where bore-to-shaft fit is critical. Long-tail applications include DIY laser cutter belt drive upgrades, servo motor coupling in educational robotics kits, and replacement pulleys for open-source motion platforms.\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 Designed for standard 3M pitch timing belts (3 mm tooth pitch). Verify your belt width matches the selected slot width (11 mm or 16 mm). Bore diameter must match your motor or drive shaft diameter. BF-type: dual flange. K-type: single flange.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M Timing Belt Synchronous Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e3M Tooth Profile\u003c\/strong\u003e\n\u003cp\u003e3 mm pitch tooth geometry ensures positive engagement with 3M timing belts, eliminating slip under load for accurate linear and rotary motion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003eFive options — 20T, 25T, 30T, 35T, 40T — let you dial in the exact gear ratio and pitch diameter your drive system requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e \u003cstrong\u003eBroad Bore Selection\u003c\/strong\u003e\n\u003cp\u003eBore diameters from 5 mm to 15 mm (including 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm, 12.7 mm, 14 mm) cover NEMA stepper shafts, servo shafts, and custom drive rods.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e↔️\u003c\/span\u003e \u003cstrong\u003eDual Slot Width Options\u003c\/strong\u003e\n\u003cp\u003e11 mm and 16 mm slot widths accommodate both standard and wide 3M belt configurations, giving you flexibility across different machine builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eBF-Type \u0026amp; K-Type Flanges\u003c\/strong\u003e\n\u003cp\u003eBF-type dual flanges keep the belt centered under dynamic loads; K-type single flange allows lateral belt removal without full disassembly — choose based on your maintenance workflow.\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 alloy body delivers a low-inertia, corrosion-resistant pulley that withstands continuous duty cycles in workshop and light industrial environments.\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 — 3M Synchronous Drive Pulleys\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003e3M (3 mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e20T \/ 25T \/ 30T \/ 35T \/ 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSlot Width Options\u003c\/th\u003e\n\u003ctd\u003e11 mm \/ 16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (dual flange) \/ K-type (single flange)\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSet Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e11 mm or 16 mm (match to slot width selected)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC, 3D printers, robotics, automation, conveyor drives\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 20T, 25T, 30T, 35T, and 40T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eTooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. Fewer teeth (20T) give a smaller diameter and higher belt speed per shaft revolution; more teeth (40T) increase pitch diameter and reduce belt tension for a given torque. Match the tooth count to your required linear speed, torque, and available shaft center distance. If you are replacing an existing pulley, count the teeth on the original.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between BF-type and K-type flanges?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-type pulleys have flanges on both sides of the belt groove. This keeps the belt centered and prevents it from walking off under lateral forces — ideal for high-speed or long-run applications. K-type pulleys have a flange on one side only, which allows the belt to be slid off laterally without removing the pulley from the shaft, making belt replacement faster in confined spaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\nWhich bore diameter should I select for a NEMA 17 stepper motor?\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, ensure the set screw engages the flat. For NEMA 23 motors, the shaft is typically 6.35 mm (1\/4 inch) — select the 6.35 mm bore variant accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these pulleys fit 3M timing belts from other brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The 3M tooth profile is an industry-standard specification. These pulleys are compatible with any 3M pitch timing belt (3 mm tooth pitch) regardless of brand, provided the belt width matches the slot width you select (11 mm or 16 mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys suitable for continuous-duty or high-cycle applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy construction provides a good strength-to-weight ratio and adequate fatigue resistance for typical CNC, 3D printing, and light automation duty cycles. For very high-load or high-temperature industrial environments, contact us to confirm suitability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I secure the pulley to the shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys use a set screw (grub screw) to clamp onto the shaft. Ensure the bore diameter matches your shaft exactly for a secure fit. For D-cut shafts, align the set screw with the flat. For round shafts, apply a small amount of thread-locking compound to the set screw for added security under vibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use an 11 mm slot pulley with a 16 mm wide belt, or vice versa?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. The slot width must match the belt width. Using a belt wider than the slot will cause the belt to ride on the flanges and wear prematurely. Using a belt narrower than the slot may allow lateral movement and reduce power transmission efficiency. Always match slot width to belt width.\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 Tooth, Bore Dia., and Slot Width \u0026amp; Type above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"3M 20T \/ 5mm \/ 11mm \u0026 BF-type","offer_id":52444021817618,"sku":"CHERRY064553x1","price":11.94,"currency_code":"USD","in_stock":true},{"title":"3M 20T \/ 6mm \/ 11mm \u0026 BF-type","offer_id":52444021850386,"sku":"CHERRY064554x1","price":11.94,"currency_code":"USD","in_stock":true},{"title":"3M 20T \/ 6mm \/ 11mm \u0026 K-type","offer_id":52444021883154,"sku":"CHERRY064555x1","price":14.44,"currency_code":"USD","in_stock":true},{"title":"3M 20T \/ 8mm \/ 11mm \u0026 K-type","offer_id":52444021915922,"sku":"CHERRY064556x1","price":14.44,"currency_code":"USD","in_stock":true},{"title":"3M 20T \/ 10mm \/ 11mm \u0026 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