{"product_id":"htd-5m-46t-75t-timing-belt-pulleys-pitch-5mm-bf-type-bore-5mm-20mm-width-21mm","title":"HTD-5M 46T-75T Timing Belt Pulleys Pitch 5mm BF-type Bore 5mm-20mm Width 21mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD-5M Timing Belt Pulleys — Precision BF-Type Bore for CNC \u0026amp; Automation Drives\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned pulley stalls your CNC router, 3D printer, or robotic axis mid-job, the cost is more than downtime — it's ruined workpieces and lost confidence in your build. Engineers, makers, and machine builders who demand repeatable, slip-free motion need HTD-5M timing belt pulleys they can spec once and forget. These BF-type pulleys are engineered for exactly that: a secure, concentric fit on your shaft with zero belt-skip under load.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a hard-anodized finish, featuring an HTD (High Torque Drive) 5mm pitch tooth profile. The BF-type bore design includes a through-bore with a set-screw flat, allowing firm shaft clamping without a keyway. Available tooth counts span 46T, 48T, 50T, 60T, 72T, and 75T; bore options range from 5 mm (0.20 in) to 28 mm (1.10 in); belt-contact width is a fixed 21 mm (0.83 in).\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router X\/Y\/Z axis drives requiring low-backlash synchronous motion, delta-style 3D printer effector carriages where consistent belt tension is critical, and custom robotics or conveyor automation projects where a compact, lightweight pulley reduces rotational inertia on servo-driven joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatible with:\u003c\/strong\u003e HTD 5M timing belts (5mm pitch) — confirm belt width ≥ 21mm for full tooth engagement.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These HTD-5M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eBF-Type Bore with Set-Screw Flat\u003c\/strong\u003e\n\u003cp\u003eThrough-bore with a machined flat and set-screw tapped hole locks the pulley firmly to the shaft — no keyway required, no rotational slip.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eHTD 5mm Pitch Tooth Profile\u003c\/strong\u003e\n\u003cp\u003eRounded HTD tooth geometry distributes belt load across a larger contact area than trapezoidal profiles, reducing tooth shear stress at higher torques.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Tooth-Count Selection (46T – 75T)\u003c\/strong\u003e\n\u003cp\u003eSix tooth counts let you dial in the exact drive ratio your axis or mechanism needs without resorting to custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eBroad Bore Range (5 mm – 28 mm)\u003c\/strong\u003e\n\u003cp\u003eFits common motor and shaft diameters from 5 mm stepper shafts up to 28 mm servo output shafts, covering most CNC and robotics applications.\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\u003eLightweight aluminum body keeps rotational inertia low for responsive acceleration, while the anodized surface resists wear and corrosion in workshop environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eFixed 21 mm Belt-Contact Width\u003c\/strong\u003e\n\u003cp\u003eStandardized 21 mm (0.83 in) width ensures compatibility with widely available 15 mm and 20 mm wide HTD 5M belts when used with appropriate flanges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD-5M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e5 mm (HTD profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eHTD (High Torque Drive), rounded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Tooth Counts\u003c\/th\u003e\n\u003ctd\u003e46T, 48T, 50T, 60T, 72T, 75T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (through-bore with set-screw flat)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 28 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt-Contact Width\u003c\/th\u003e\n\u003ctd\u003e21 mm (0.83 in)\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\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eAnodized\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\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\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 the right tooth count (46T, 48T, 50T, 60T, 72T, or 75T)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven pulley's tooth count by the driving pulley's tooth count to get the ratio. For example, pairing a 20T motor pulley with a 60T axis pulley gives a 3:1 reduction. Choose a larger tooth count for more torque and slower speed; a smaller count for higher speed and less torque. Also verify that the resulting pulley outer diameter fits within your frame clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my stepper or servo motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bore to your shaft diameter exactly. Common stepper motor shafts are 5 mm or 6.35 mm (1\/4 in); NEMA 23 steppers typically use 6.35 mm or 8 mm; servo motors vary from 8 mm to 25 mm+. Measure your shaft with calipers before ordering. The BF-type bore includes a set-screw flat, so the shaft must have a matching flat or you should file one to prevent rotation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley work with my existing HTD 5M timing belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these pulleys are designed for standard HTD 5M belts (5 mm pitch, rounded tooth profile). Ensure your belt width is compatible with the 21 mm pulley width; belts of 15 mm or 20 mm width are commonly used with this pulley size. Do not use with MXL, T5, GT2, or other non-HTD 5M profiles, as tooth geometry differs and will cause skipping or accelerated wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the set-screw clamping — will it hold under high torque?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe BF-type bore uses a set screw bearing against a flat on the shaft, which provides reliable clamping for typical CNC and robotics loads. For very high-torque applications (e.g., heavy gantry axes or industrial conveyors), consider using thread-locking compound on the set screw and verifying torque limits against your motor's rated output. A keyway-style pulley may be more appropriate for sustained high-torque industrial duty cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs the aluminum construction corrosion-resistant enough for workshop use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized aluminum finish provides good resistance to oxidation, light moisture, and common workshop lubricants. It is suitable for indoor CNC, 3D printing, and robotics environments. Avoid prolonged exposure to salt spray, strong acids, or alkaline cutting fluids, which can degrade the anodized layer over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley on both the motor shaft and the idler\/driven shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The BF-type bore design works on any shaft of the matching diameter, whether it is a motor output shaft, a lead screw coupling, or a driven axis shaft. Just ensure the bore size matches each shaft and that both pulleys are aligned in the same plane to prevent belt tracking issues and premature wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between HTD and GT2 pulleys — can I mix them?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHTD (High Torque Drive) and GT2\/GT3 are different tooth profiles and are not interchangeable. HTD has a semicircular tooth root designed for high-torque power transmission; GT2\/GT3 uses a modified curvilinear profile optimized for low-backlash positioning. Mixing pulleys and belts of different profiles will cause poor meshing, skipping, and rapid wear. Always match pulley and belt profiles exactly.\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 and Bore size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"5M-46T \/ 5mm \/ 1Pcs","offer_id":52445689872658,"sku":"FXL5M46TC21D5BFx1","price":19.79,"currency_code":"USD","in_stock":true},{"title":"5M-46T \/ 6mm \/ 1Pcs","offer_id":52445689905426,"sku":"FXL5M46TC21D6BFx1","price":19.79,"currency_code":"USD","in_stock":true},{"title":"5M-46T \/ 8mm \/ 1Pcs","offer_id":52445689938194,"sku":"FXL5M46TC21D8BFx1","price":20.6,"currency_code":"USD","in_stock":true},{"title":"5M-46T \/ 10mm \/ 1Pcs","offer_id":52445689970962,"sku":"FXL5M46TC21D10BFx1","price":20.52,"currency_code":"USD","in_stock":true},{"title":"5M-46T \/ 12mm \/ 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