{"product_id":"s3m-timing-belt-pulley-3mm-pitch-bf-type-65-150t-11mm","title":"S3M 65-150Teeth Timing Belt Pulley Pitch 3mm BF-type CNC Drive Pulley Width 11mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eS3M Timing Belt Pulley 3mm Pitch — Precise CNC Drive for Makers \u0026amp; Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands slip-free synchronization, a mismatched or worn pulley is the first thing that kills accuracy. Whether you are designing a CNC router, tuning a 3D printer, or assembling a compact robotics platform, the S3M timing belt pulley with 3mm pitch gives you the repeatable, zero-backlash drive you need to keep every axis on target.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy with a hard-anodized or natural finish and features the BF-type flange configuration — flanged on both sides to keep your S3M belt tracking straight under load. The 11mm belt-contact width matches standard S3M belt widths directly. Tooth counts span 65 T to 150 T (pitch circle diameters approximately 62.1 mm \/ 2.44 in to 143.2 mm \/ 5.64 in), and bore options run from 8 mm to 15 mm to suit a wide range of shaft sizes.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC milling and routing machines requiring precise X\/Y axis drive, desktop 3D printers using S3M belt drive systems, and lightweight robotic arms or automated conveyor stages where a compact, low-inertia pulley reduces motor load and improves dynamic response.\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 S3M synchronous timing belts — 3mm pitch, 11mm width (S3M-11 series). Verify your shaft diameter matches the selected bore before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These S3M 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\u003eBF-Type Double Flange\u003c\/strong\u003e\n\u003cp\u003eFlanges on both sides of the tooth profile keep the S3M belt centered and prevent lateral walk, even under side-load conditions common in CNC gantry setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003e3mm Pitch — S3M Standard\u003c\/strong\u003e\n\u003cp\u003eTooth geometry is machined to the S3M standard (3mm pitch), ensuring full mesh with S3M belts and consistent pitch-circle accuracy across all tooth counts from 65 T to 150 T.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003eWide Bore Range: 8–15mm\u003c\/strong\u003e\n\u003cp\u003eAvailable in 8 mm, 10 mm, 12 mm, 14 mm, and 15 mm bores to fit stepper motor shafts, servo shafts, and custom drive shafts without additional machining in most cases.\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 keeps rotational inertia low, allowing faster acceleration and deceleration cycles — a measurable advantage in high-speed 3D printing and CNC rapid-traverse moves.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003e11mm Belt-Contact Width\u003c\/strong\u003e\n\u003cp\u003eThe 11mm groove width is dimensioned for standard S3M-11 belts, providing full tooth engagement across the belt width for maximum torque transfer and reduced tooth wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eBroad Tooth-Count Selection\u003c\/strong\u003e\n\u003cp\u003eTen tooth-count options (65 T, 70 T, 72 T, 74 T, 75 T, 80 T, 90 T, 120 T, 140 T, 150 T) let you dial in the exact drive ratio your project requires without custom fabrication.\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 — S3M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eS3M (Synchronous 3mm Pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eBF-type (Double Flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width (Groove)\u003c\/th\u003e\n\u003ctd\u003e11 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e65 T \/ 70 T \/ 72 T \/ 74 T \/ 75 T \/ 80 T \/ 90 T \/ 120 T \/ 140 T \/ 150 T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (approx. 62.1 mm – 143.2 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 10 mm \/ 12 mm \/ 14 mm \/ 15 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\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway \/ Set Screw\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Width\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 for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines the pitch circle diameter and, combined with your motor-side pulley, sets the drive ratio. For a 1:1 drive use matching tooth counts on both pulleys. To reduce speed and increase torque, use a larger tooth count on the driven side. Common CNC and 3D-printer setups pair a 20 T motor pulley with a 65–80 T driven pulley for a 3.25:1 to 4:1 reduction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for a NEMA 17 stepper motor?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNEMA 17 stepper motors typically have a 5 mm output shaft. These pulleys start at 8 mm bore, so you would need a shaft adapter or a custom-bored pulley for a direct NEMA 17 fit. For NEMA 23 motors (6.35 mm or 8 mm shaft) the 8 mm bore variant fits directly. Always measure your shaft diameter before selecting a bore.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat belt should I pair with these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed exclusively for S3M synchronous timing belts with a 3 mm pitch and 11 mm width (S3M-11 series). Using a belt with a different pitch or width will result in poor tooth engagement and accelerated wear. Do not use GT2, HTD, or other pitch belts with these pulleys.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys suitable for high-speed or continuous-duty applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy construction makes these pulleys well-suited for moderate-to-high speed applications such as CNC routing and 3D printing where low inertia is important. For continuous heavy-duty industrial use with sustained high torque, verify that the aluminum alloy grade and bore fit meet your load requirements, or contact us to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo the pulleys include a keyway or set screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eKeyway and set-screw configuration varies by variant. Please refer to the variant detail or contact us to confirm the exact fastening method for your selected tooth count and bore combination before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I calculate the correct belt length for my drive system?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBelt length (L) can be estimated with the formula: L ≈ 2C + π(D₁ + D₂)\/2 + (D₂ − D₁)²\/(4C), where C is the center distance between shafts and D₁, D₂ are the pitch circle diameters of the two pulleys. For S3M pulleys, pitch circle diameter = (Number of Teeth × 3 mm) \/ π. Round up to the nearest available S3M belt length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys in a corrosive or outdoor environment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy offers good natural corrosion resistance for indoor and light-outdoor use. For harsh environments with exposure to salt spray, acids, or prolonged moisture, consider applying an additional protective coating or contact us to confirm the finish specification for your selected variant.\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 above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"S3M65T \/ 8mm \/ 1Pcs","offer_id":52444716728594,"sku":"FXLS3M65TC11D8BFx1","price":32.49,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 10mm \/ 1Pcs","offer_id":52444716761362,"sku":"FXLS3M65TC11D10BFx1","price":32.35,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 12mm \/ 1Pcs","offer_id":52444716794130,"sku":"FXLS3M65TC11D12BFx1","price":32.16,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 14mm \/ 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