{"product_id":"htd5m-timing-belt-pulley-15-25-teeth-clamping-bore-cnc-stepper-motor","title":"HTD5M Timing Belt Pulley 15 16 18 20 25 Teeth Clamping Bore for CNC-Step Motor","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHTD5M Timing Belt Pulley — Precision Clamping Bore for CNC \u0026amp; Stepper Motor Drives\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a loose or mismatched pulley bore. Engineers, makers, and automation builders who demand repeatable motion need a pulley that locks firmly onto the shaft and stays there. This HTD5M timing belt pulley is designed for exactly that — a clamping-style bore that grips the shaft mechanically, eliminating set-screw slippage under load.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy and features the HTD5M tooth profile (5 mm pitch, rounded tooth form) compatible with standard HTD5M synchronous belts. Available in 15, 16, 18, 20, and 25 tooth counts, belt widths of 15 mm (~0.59 in) and 20 mm (~0.79 in), and bore diameters ranging from 5 mm to 20 mm (~0.20–0.79 in). Two flange shapes are offered: BF (with flanges) and K (keyway-style clamping hub).\u003c\/p\u003e\n\u003cp\u003eTypical applications include DIY CNC milling machines requiring precise X\/Y axis synchronization, FDM 3D printer extruder and motion systems, laser engraver gantry drives, and light-duty conveyor or indexing table builds where a 5 mm pitch HTD belt drive is specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with standard \u003cstrong\u003eHTD5M synchronous belts\u003c\/strong\u003e — 15 mm and 20 mm widths. Verify shaft diameter matches your selected bore before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These HTD5M Timing Belt Pulleys\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eClamping Bore Design\u003c\/strong\u003e — Mechanical clamping hub (BF or K style) grips the shaft without relying solely on set screws, reducing slippage under dynamic loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eHTD5M Tooth Profile\u003c\/strong\u003e — 5 mm pitch rounded tooth form provides smooth, low-noise power transmission and positive engagement with HTD5M belts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Selection\u003c\/strong\u003e — 15, 16, 18, 20, and 25 tooth options across 15 mm and 20 mm belt widths; bore sizes from 5 mm to 20 mm to suit most stepper and servo motor shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid material keeps rotational inertia low, supporting faster acceleration in CNC and 3D printer motion systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003ePrecision Machined Teeth\u003c\/strong\u003e — Consistent tooth geometry across the full circumference ensures even belt tension and minimizes backlash in closed-loop or open-loop positioning systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eDual Flange Styles\u003c\/strong\u003e — BF (flanged) keeps the belt tracked laterally; K (keyway hub) suits applications requiring a keyed shaft interface for higher torque transmission.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — HTD5M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Profile\u003c\/th\u003e\n\u003ctd\u003eHTD5M (5 mm pitch, rounded tooth)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count Options\u003c\/th\u003e\n\u003ctd\u003e15 \/ 16 \/ 18 \/ 20 \/ 25 teeth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e15 mm (~0.59 in) \/ 20 mm (~0.79 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter Range\u003c\/th\u003e\n\u003ctd\u003e5 mm – 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlange \/ Hub Style\u003c\/th\u003e\n\u003ctd\u003eBF (flanged) or K (keyway clamping hub)\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 anodized \/ machined surface\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 Clamping Method\u003c\/th\u003e\n\u003ctd\u003eMechanical clamping bore (split-hub or keyway)\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 for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pulley's pitch diameter and, combined with your motor shaft speed, sets the linear belt speed. For CNC and 3D printer motion systems, 20-tooth pulleys are a common starting point as they balance speed and torque. Fewer teeth (15–16) give more torque at lower speed; more teeth (25) increase speed at a given RPM. Match the tooth count on both the drive and driven pulleys to achieve your desired gear ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between BF and K flange styles?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF (flanged) pulleys have raised flanges on both sides of the tooth face that keep the belt from walking off laterally — useful when belt alignment cannot be guaranteed mechanically. K-style pulleys feature a keyway clamping hub designed for keyed shafts, providing a more positive torque connection suitable for higher-load applications. Choose BF for most open-loop 3D printer and light CNC builds; choose K when your motor shaft has a keyway and you need maximum torque transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore diameter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. Common stepper motor shaft sizes are 5 mm, 6 mm, 6.35 mm (1\/4 in), and 8 mm. Select the bore that matches your shaft exactly — the clamping bore design allows a secure fit without requiring a perfectly tight interference fit, but the bore must not be larger than the shaft. If your shaft is between listed sizes, contact us to confirm availability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 or MXL belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. This pulley uses the HTD5M tooth profile (5 mm pitch, rounded\/curvilinear tooth form), which is not interchangeable with GT2 (2 mm pitch) or MXL (0.08 in pitch) belts. Always pair HTD5M pulleys with HTD5M belts of the matching width (15 mm or 20 mm). Using a mismatched belt profile will cause skipping and accelerated wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the clamping bore — will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe clamping bore (split-hub or keyway style) provides a mechanical grip on the shaft that is significantly more secure than a single set screw alone. For typical CNC router and 3D printer stepper motor torques (generally under 1 Nm for NEMA 17, up to ~3 Nm for NEMA 23), the clamping hub holds reliably when the clamping bolt is tightened to the recommended torque. For very high-torque or shock-load applications, the K-style keyway variant is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the aluminum pulley corrode or wear quickly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy has natural corrosion resistance suitable for indoor workshop and machine environments. The anodized or machined surface finish provides additional protection against oxidation. For outdoor or high-humidity environments, periodic inspection is recommended. The tooth surface hardness is adequate for use with rubber or polyurethane HTD5M belts under normal operating loads; abrasive environments may accelerate tooth wear over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley with a NEMA 17 or NEMA 23 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. NEMA 17 stepper motors typically have a 5 mm shaft — select the 5 mm bore variant. NEMA 23 motors commonly use 6.35 mm (1\/4 in) or 8 mm shafts — select the matching bore. Always verify your specific motor's shaft diameter in its datasheet before ordering, as shaft sizes can vary between manufacturers even within the same NEMA frame size.\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, Belt Width, and Bore Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"15 Teeth \u0026 BF \/ 15mm \/ 5mm \u0026 1 pcs","offer_id":52444773220626,"sku":"WSS064625x1","price":10.24,"currency_code":"USD","in_stock":true},{"title":"15 Teeth \u0026 BF \/ 15mm \/ 6mm \u0026 1 pcs","offer_id":52444773253394,"sku":"WSS064626x1","price":10.24,"currency_code":"USD","in_stock":true},{"title":"15 Teeth \u0026 BF \/ 15mm \/ 6.35mm \u0026 1 pcs","offer_id":52444773286162,"sku":"WSS064627x1","price":10.24,"currency_code":"USD","in_stock":true},{"title":"15 Teeth \u0026 BF \/ 20mm \/ 5mm \u0026 1 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