{"product_id":"3m-timing-belt-pulley-bf-k-type-cnc-stepper-motor-20-100t","title":"3M Timing Belt Drive Pulley BF\/K-Type Pitch 3mm For CNC Step Motor 20~100 Teeth","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3M Timing Belt Drive Pulleys — Precision BF\/K-Type for CNC and Stepper Motor Builds\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or robotic actuator demands repeatable, slip-free motion, a mismatched or worn pulley becomes the weakest link in the entire drive train. Engineers and makers who need dimensional accuracy across long print runs or multi-axis cutting paths rely on correctly specified timing pulleys to eliminate backlash and maintain positional fidelity. These 3M pitch timing belt drive pulleys are engineered for that exact use case, available in both BF-Type (with integrated flanges for belt retention) and K-Type (open-hub, compact profile) configurations.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with an anodized finish for corrosion resistance and reduced rotating mass. The 3M designation refers to a 3 mm belt pitch, compatible with standard 3M synchronous belts. Tooth counts span 20T through 100T, covering a wide range of speed-reduction and torque-multiplication ratios. Bore diameters range from 8 mm (0.31 in) to 25 mm (0.98 in), with keyway slot widths from 3×1.4 mm up to 8×3.3 mm to accommodate common shaft and key standards. Belt width compatibility is 11 mm across all variants.\u003c\/p\u003e\n\u003cp\u003eTypical applications include NEMA 17\/23 stepper motor drives in desktop CNC mills and laser engravers, Z-axis and extruder drives in FDM 3D printers requiring consistent layer height, and lightweight robotic joint actuators where low inertia and accurate gear ratio selection are critical. The broad tooth-count range also makes these pulleys suitable for custom timing belt conveyor systems and automated pick-and-place mechanisms.\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 3M pitch synchronous timing belts, 11 mm belt width. Verify bore diameter and keyway dimensions against your shaft spec before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3M Timing Belt Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eTwo Pulley Types\u003c\/strong\u003e — BF-Type includes dual flanges to keep the belt tracked under lateral load; K-Type offers a compact open-hub profile for space-constrained assemblies.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWide Tooth-Count Range\u003c\/strong\u003e — 17 tooth-count options from 20T to 100T let you dial in the exact speed ratio your drive system requires without custom machining.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🕳️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eMultiple Bore and Keyway Options\u003c\/strong\u003e — Bore sizes from 8 mm to 25 mm with matching keyway slots (3×1.4 mm through 8×3.3 mm) cover NEMA stepper shafts and standard metric shaft diameters.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e — Lightweight yet rigid aluminum body reduces rotational inertia for faster acceleration and deceleration in servo and stepper applications.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAnodized Finish\u003c\/strong\u003e — Surface anodizing provides corrosion resistance and wear protection, extending service life in open-frame machines exposed to coolant mist or humidity.\u003c\/p\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e3M Pitch Compatibility\u003c\/strong\u003e — Designed to mesh precisely with 3M synchronous belts, delivering low-noise, backlash-minimized power transmission for positioning-critical CNC and 3D printing drives.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 3M Timing Belt Pulleys\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e3M (3 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eBF-Type (flanged) \/ K-Type (open hub)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e20T, 24T, 25T, 30T, 32T, 35T, 36T, 40T, 50T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 25 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Slot\u003c\/th\u003e\n\u003ctd\u003e3×1.4 mm \/ 4×1.8 mm \/ 5×2.3 mm \/ 6×2.8 mm \/ 8×3.3 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e11 mm\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\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 between BF-Type and K-Type pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBF-Type pulleys have integrated flanges on both sides of the tooth profile, which physically retain the belt and prevent it from walking off the pulley under lateral forces or misalignment. Choose BF-Type for open-loop stepper systems, long belt spans, or any setup where belt tracking is a concern. K-Type pulleys omit the flanges for a narrower overall width, making them better suited for compact assemblies where axial space is limited and belt alignment is well-controlled by the frame geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich tooth count should I select for my CNC or 3D printer?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pulley pitch diameter and, combined with your motor's steps-per-revolution, sets the linear resolution of your axis. For most desktop CNC and 3D printer X\/Y axes using NEMA 17 motors, 20T is the most common choice, yielding approximately 40 mm of belt travel per motor revolution with a 3M belt. Higher tooth counts (e.g., 30T–40T) are used on the driven (passive) side to create a speed reduction, increasing torque at the cost of speed. Match your tooth count to your target steps\/mm calculation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm the correct bore size for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter with a caliper. NEMA 17 stepper motors typically have a 5 mm shaft, while NEMA 23 motors commonly use 6.35 mm (1\/4 in) or 8 mm shafts. Select the bore size that matches your shaft diameter exactly — a loose bore will cause runout and positioning errors. Also verify the keyway dimensions: the slot width and depth must match the key stock you plan to use for torque transmission.\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 designed to the standard 3M pitch profile (3 mm tooth pitch, trapezoidal tooth form), which is an industry-standard specification. They are compatible with any 3M synchronous timing belt of 11 mm width from any manufacturer that conforms to the 3M standard. Always verify that your belt is rated for 3M pitch and 11 mm width before pairing it with these pulleys.\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 high-torque applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in CNC and 3D printing applications. For reference, NEMA 17 motors typically produce 0.4–0.6 N·m of holding torque, and NEMA 23 motors range from 1–3 N·m — both well within the load capacity of aluminum pulleys at these belt widths. For very high-torque industrial drives exceeding these ranges, consult the specific load ratings for your application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys resist corrosion in humid or coolant-exposed environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The anodized surface treatment creates an aluminum oxide layer that significantly improves corrosion resistance compared to bare aluminum. This makes the pulleys suitable for use in open-frame CNC routers where coolant mist or cutting fluid may be present, as well as in humid workshop environments. For immersion or heavy coolant flood applications, additional protective measures may be advisable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys for a belt-driven conveyor or pick-and-place system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The wide range of tooth counts (20T–100T) and bore sizes makes these pulleys adaptable to custom conveyor and automation builds beyond CNC and 3D printing. For conveyor applications, select the tooth count that gives you the desired belt speed at your motor's operating RPM, and ensure the belt tension and load are within the capacity of the 3M belt and pulley combination. The BF-Type flanged variant is recommended for conveyor use to maintain belt tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Pulley Type, Numbers Of Teeth, and Bore Size \u0026amp; Slot Width above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"K-Type \/ 3M 20T \/ 8mm(3x1.4mm) \u0026 11mm","offer_id":52445135438098,"sku":"GLFBBYWGLBZSJ067811x1","price":10.96,"currency_code":"USD","in_stock":true},{"title":"K-Type \/ 3M 20T \/ 10mm(3x1.4mm) \u0026 11mm","offer_id":52445135470866,"sku":"GLFBBYWGLBZSJ067812x1","price":10.96,"currency_code":"USD","in_stock":true},{"title":"K-Type \/ 3M 20T \/ 10mm(4x1.8mm) \u0026 11mm","offer_id":52445135503634,"sku":"GLFBBYWGLBZSJ067813x1","price":10.96,"currency_code":"USD","in_stock":true},{"title":"K-Type \/ 3M 24T \/ 8mm(3x1.4mm) \u0026 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