{"product_id":"3m-bf-type-timing-belt-pulley-40t-60t-belt-width-15mm-bore-6-25mm","title":"3M BF-Type Timing Belt Pulley 40T-60T Applicable Belt Width:15mm Bore:6mm~25mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M BF-Type Timing Belt Pulley — Precision Motion Control for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or automation rig demands repeatable, slip-free motion, the wrong pulley becomes the weakest link in your drive train. Engineers and makers who need a reliable 3M BF-type timing belt pulley with a wide bore selection can stop searching — this series covers 40T, 48T, 50T, and 60T tooth counts with bore diameters from 6 mm to 25 mm (approximately 0.24 in to 0.98 in), all matched to a 15 mm (0.59 in) belt width.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a natural or anodized finish and features the BF-type flange profile that keeps the belt tracking true under load. The 3M pitch (3 mm \/ 0.118 in tooth spacing) is a widely adopted standard for light-to-medium duty synchronous drives. Bore options include plain round bores (6–25 mm) and keyway bores (e.g., 8×3×1.4 mm, 10×4×1.8 mm, 12×5×2.3 mm, 14×5×2.3 mm, 19×6×2.8 mm) for positive shaft engagement without set-screw slip.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include desktop CNC router X\/Y axis drives, delta-style 3D printer effector carriages, pick-and-place machine linear stages, and small conveyor synchronization systems — anywhere a compact, low-backlash 3M timing pulley is required for a stepper or servo motor shaft.\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 3M pitch (3 mm) synchronous timing belts with 15 mm width — BF-type (flanged) profile. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 3M BF-Type Timing Belt Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🦷\u003c\/div\u003e\n\u003cstrong\u003eFour Tooth-Count Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 40T, 48T, 50T, and 60T to let you dial in the exact gear ratio your drive system needs without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eWide Bore Range: 6–25 mm\u003c\/strong\u003e\n\u003cp\u003ePlain round bores from 6 mm to 25 mm (0.24–0.98 in) plus keyway variants cover the most common stepper and servo motor shaft sizes used in CNC and robotics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cstrong\u003eBF-Type Flanged Profile\u003c\/strong\u003e\n\u003cp\u003eThe dual-flange design keeps the 15 mm belt centered on the pulley under lateral loads, reducing belt walk and extending belt service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003e3M Pitch — Synchronous Drive Standard\u003c\/strong\u003e\n\u003cp\u003e3 mm tooth pitch delivers low-backlash, slip-free power transmission suitable for position-critical CNC axes, 3D printer carriages, and automation stages.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔑\u003c\/div\u003e\n\u003cstrong\u003eKeyway Bore Options Available\u003c\/strong\u003e\n\u003cp\u003eSelect keyway bore variants (e.g., 8×3×1.4 mm, 12×5×2.3 mm, 19×6×2.8 mm) for positive shaft locking — ideal where set-screw-only retention is insufficient under reversing loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eLightweight aluminum alloy body keeps rotational inertia low for fast acceleration and deceleration cycles in servo-driven motion control applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M BF-Type Timing Belt Pulley\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003e3M (3 mm pitch) synchronous timing belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Profile\u003c\/th\u003e\n\u003ctd\u003eBF-type (flanged)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e40T \/ 48T \/ 50T \/ 60T (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 (0.59 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e6 mm – 25 mm (0.24 – 0.98 in); see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Width\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\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 (40T, 48T, 50T, or 60T)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your drive ratio. Pair a smaller pulley on the motor shaft with a larger pulley on the driven shaft to reduce speed and multiply torque, or use equal tooth counts for a 1:1 ratio. For example, a 40T motor pulley paired with a 60T driven pulley gives a 1.5:1 reduction. Calculate your required ratio first, then select the tooth count combination that fits within your frame geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore diameter should I select for my stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor shaft diameter with a caliper. Common NEMA 17 stepper shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm (1\/4 in) or 8 mm; NEMA 34 shafts are often 12.7 mm or 14 mm. Select the bore that matches your shaft exactly — a loose bore causes runout and positioning errors. If your shaft has a keyway, choose the matching keyway bore variant (e.g., 8×3×1.4 mm for an 8 mm keyed shaft).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a plain bore and a keyway bore?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA plain bore relies on one or two set screws to grip the shaft. This works well for light, unidirectional loads. A keyway bore uses a machined slot that mates with a key on the shaft, providing positive mechanical engagement. Keyway bores are recommended for reversing loads, high-torque applications, or anywhere shaft slip would cause positioning errors — such as CNC router axes or servo-driven conveyors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys compatible with any 3M timing belt, or only specific brands?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are machined to the standard 3M pitch (3 mm tooth spacing) and 15 mm belt width profile, making them compatible with any 3M synchronous timing belt of the same width from any manufacturer — including open-ended and closed-loop belts. Always verify the belt width matches the 15 mm pulley face before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are aluminum timing pulleys — can they handle my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives typical of desktop CNC machines, 3D printers, pick-and-place systems, and small automation stages. For heavy industrial loads or high-shock environments, consider whether a steel pulley would be more appropriate. The 3M belt system itself is rated for moderate torque; consult your belt manufacturer's load tables for specific torque limits at your operating speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to buy a matching idler or tensioner pulley separately?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — drive pulleys and idler\/tensioner pulleys are sold separately. For a complete drive system you will need at least two drive pulleys (or one drive and one idler), a 3M timing belt of the correct length, and appropriate shaft hardware. Check our store for matching 3M idler pulleys and belt stock to complete your build.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys with a GT2 or HTD belt?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. These pulleys are designed specifically for 3M pitch (3 mm) trapezoidal-profile timing belts. GT2 belts use a 2 mm pitch with a curvilinear tooth profile, and HTD belts use a different tooth geometry. Mixing belt and pulley profiles causes poor meshing, accelerated wear, and potential belt skipping. Always match the belt pitch and profile to the pulley specification.\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 Diameter above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"BF-type \/ 40T \/ 6mm \u0026 15mm","offer_id":52444958720274,"sku":"GLFBBYWGLBZSJ068042x1","price":6.7,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 40T \/ 8mm \u0026 15mm","offer_id":52444958753042,"sku":"GLFBBYWGLBZSJ068043x1","price":6.7,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 40T \/ 10mm \u0026 15mm","offer_id":52444958785810,"sku":"GLFBBYWGLBZSJ068044x1","price":6.7,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 40T \/ 12mm \u0026 15mm","offer_id":52444958818578,"sku":"GLFBBYWGLBZSJ068045x1","price":6.7,"currency_code":"USD","in_stock":true},{"title":"BF-type \/ 40T \/ 14mm \u0026 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