{"product_id":"gt2-timing-belt-pulley-40-44t-bf-type-bore-5-15mm","title":"GT2 Pulley 40~44 Teeth Timing Belt Pulley BF-type Bore=5~15mm Tooth width=7 mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eGT2 Timing Belt Pulley 40–44 Teeth — Reliable BF-Type Drive for Precision Motion Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your 3D printer skips steps, your CNC router loses position, or your robotics drive train slips under load, the culprit is often a poorly fitted pulley. Engineers, makers, and machine builders who demand repeatable, slip-free motion need a GT2 timing belt pulley that fits their shaft exactly — not one that requires shimming or loctite to stay put. These GT2 BF-type pulleys are designed for builders who refuse to compromise on dimensional accuracy.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy and features the GT2 tooth profile (2 mm pitch) with a 7 mm tooth width, available in 40T, 42T, and 44T tooth counts. Bore diameters range from 5 mm to 15 mm (approximately 0.197 in to 0.591 in), with optional keyway widths of 3 mm, 4 mm, or 5 mm for positive shaft locking. The BF-type flange design keeps the belt tracking true under lateral load.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include GT2 belt-driven 3D printer axes (X\/Y gantry replacement pulleys), CNC router spindle drive systems requiring 40–44 tooth reduction ratios, and custom robotics or automation rigs where a keyed shaft connection eliminates rotational slip during high-torque reversals.\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 2GT \/ GT2 timing belts (2 mm pitch, 6 mm or 7 mm width). Verify bore diameter and keyway width against your shaft spec before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These GT2 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\u003e40T \/ 42T \/ 44T Tooth Options\u003c\/strong\u003e\n\u003cp\u003eThree tooth counts let you dial in the exact drive ratio your motion system needs — from compact 40T for tight belt runs to 44T for smoother low-speed torque delivery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eBF-Type Flanged Design\u003c\/strong\u003e\n\u003cp\u003eDual flanges on both sides of the tooth profile keep the GT2 belt centered and prevent lateral walk-off, even during rapid direction changes on 3D printer gantries.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Bore Range: 5–15 mm\u003c\/strong\u003e\n\u003cp\u003eNine bore diameter options (5, 6, 6.35, 8, 10, 12, 12.7, 14, 15 mm) cover NEMA stepper shafts, servo motor shafts, and standard metric\/imperial rod diameters in one product line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e \u003cstrong\u003eOptional Keyway for Positive Locking\u003c\/strong\u003e\n\u003cp\u003eSelect 3 mm, 4 mm, or 5 mm keyway variants to mechanically lock the pulley to a keyed shaft — eliminating rotational slip under high-torque or reversing loads without relying on set screws alone.\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 yet rigid aluminum alloy body keeps rotational inertia low for fast acceleration on CNC and 3D printer axes while resisting deformation under belt tension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSingle or Twin-Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1-piece or 2-piece packs so you can stock exactly what your build requires — whether replacing a single worn pulley or outfitting a dual-axis gantry in one order.\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\u003eTooth Profile\u003c\/th\u003e\n\u003ctd\u003eGT2 (2 mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Width\u003c\/th\u003e\n\u003ctd\u003e7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e40T \/ 42T \/ 44T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (flanged both sides)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 6.35 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Width\u003c\/th\u003e\n\u003ctd\u003eWithout keyway \/ 3 mm \/ 4 mm \/ 5 mm (see variant options)\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\u003eCompatible Belt\u003c\/th\u003e\n\u003ctd\u003e2GT \/ GT2 timing belt, 6–7 mm width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1 pc or 2 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\u003eHow do I choose between 40T, 42T, and 44T?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio when paired with a pinion pulley. A 40T pulley gives a slightly higher belt speed for the same motor RPM, while 44T provides more torque multiplication. For most GT2 3D printer X\/Y axes, 20T pinion + 40T driven pulley is common. If you are replacing an existing pulley, match the tooth count exactly to maintain your steps-per-mm calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore diameter should I select for a NEMA 17 stepper motor shaft?\u003c\/summary\u003e\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 option. If your motor has a D-cut or flat on the shaft, the without-keyway variant with a set screw is typically sufficient. For a fully keyed shaft, check your motor's keyway spec before selecting a keyway width.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway, or will a set screw hold the pulley securely?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor light-duty or low-torque applications such as 3D printer belt drives, a set screw on a D-shaft or smooth shaft is usually adequate. For CNC routers, robotics, or any application with frequent direction reversals or high torque, a keyed connection (3 mm, 4 mm, or 5 mm keyway) provides a positive mechanical lock that prevents rotational slip even if the set screw loosens over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with standard GT2 belts sold separately?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These pulleys are designed for the GT2 \/ 2GT tooth profile with a 2 mm pitch. They are compatible with standard open-loop GT2 timing belts and closed-loop GT2 belts in 6 mm or 7 mm width. The 7 mm tooth width on this pulley accommodates both belt widths without overhang issues.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the BF-type and the standard (no-flange) pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-type pulleys have flanges on both sides of the tooth section. These flanges act as guides that keep the timing belt from sliding off laterally during operation. This is especially important on long belt runs, high-speed axes, or any setup where the belt is not perfectly aligned. If your application has precise belt alignment and short belt spans, a no-flange pulley may work, but BF-type is the safer choice for most builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley for a CNC router or laser cutter drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The 40–44 tooth range and aluminum alloy construction make these pulleys suitable for CNC router and laser cutter belt-drive axes. For CNC applications with higher belt tension, we recommend selecting a keyway variant to ensure the pulley does not slip on the motor shaft under cutting loads. Confirm the bore diameter matches your motor or drive shaft before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the 6.35 mm and 12.7 mm bore options for imperial shafts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. 6.35 mm is equivalent to 1\/4 inch and 12.7 mm is equivalent to 1\/2 inch. These bore sizes are included specifically for builders using imperial-dimensioned shafts common in North American CNC and robotics hardware. All other bore options (5, 6, 8, 10, 12, 14, 15 mm) are standard metric sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Model \/ Bore Diameter \/ Keyway width \u0026amp; Qty above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"2GT * 40T \/ 5 mm \/ without keyway \u0026 1","offer_id":52444803760402,"sku":"WXB2GT40TC7D5BFx1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"2GT * 40T \/ 5 mm \/ without keyway \u0026 2","offer_id":52444803793170,"sku":"WXB2GT40TC7D5BFx2","price":13.4,"currency_code":"USD","in_stock":true},{"title":"2GT * 40T \/ 6.35 mm \/ without keyway \u0026 1","offer_id":52444803825938,"sku":"WXB2GT40TC7D6.35BFx1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"2GT * 40T \/ 6.35 mm \/ without keyway \u0026 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