{"product_id":"s3m-timing-belt-pulley-3mm-pitch-af-type-keyway-cnc","title":"S3M 18T-40T Timing Belt Pulley Pitch 3mm AF-type With Keyway CNC Drive Width 7mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eS3M Timing Belt Pulley — 3mm Pitch AF-Type With Keyway for Precise CNC Drive Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your CNC router, 3D printer, or automation rig demands slip-free, repeatable motion, a mismatched or poorly machined pulley becomes the weakest link in the entire drivetrain. Engineers and makers who need a reliable S3M timing belt pulley with a keyed bore — not a plain bore that spins under load — will find this AF-type series purpose-built for the job.\u003c\/p\u003e\n\u003cp\u003eEach pulley in this series is machined from aluminum alloy with an anodized finish, covering tooth counts from 18T to 40T and bore diameters from 8mm to 25mm (approximately 0.31\" to 0.98\"). The 3mm pitch (S3M standard) matches standard S3M\/HTD-3M open or closed timing belts. Drive width is 7mm, and every variant ships with a precision-cut keyway — sizes range from 3×1.4mm up to 8×3.3mm depending on bore — ensuring positive torque transfer without set-screw slippage.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include desktop CNC axis drives requiring backlash-free positioning, DIY robotic arm joints where keyway engagement prevents rotational slip under load, and compact conveyor or pick-and-place automation systems using S3M belt loops. The wide tooth-count range (18T–40T) lets you dial in your gear ratio without sourcing multiple pulley families.\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 Fits standard S3M \/ HTD-3M timing belts with 3mm pitch and 7mm width. Verify your belt width and bore requirement 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\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eAF-Type With Keyway\u003c\/strong\u003e — Positive key engagement (3×1.4mm to 8×3.3mm) locks the pulley to the shaft, eliminating rotational slip under dynamic loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (18T–40T)\u003c\/strong\u003e — Sixteen tooth-count options let you fine-tune drive ratios for speed or torque without switching belt families.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🕳️\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Sizes (8–25mm)\u003c\/strong\u003e — Twelve bore options from 8mm to 25mm cover most standard motor and shaft diameters used in CNC and robotics.\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 rotating inertia low while maintaining dimensional accuracy under continuous operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e3mm Pitch \/ 7mm Drive Width\u003c\/strong\u003e — Matches the S3M belt standard precisely; the 7mm belt contact width provides adequate load capacity for light-to-medium duty applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eCNC-Machined Tooth Profile\u003c\/strong\u003e — Consistent tooth geometry across the full range ensures smooth belt engagement and reduced vibration at operating speeds.\u003c\/li\u003e\n\u003c\/ul\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 Standard\u003c\/th\u003e\n\u003ctd\u003eS3M (HTD-3M compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Width\u003c\/th\u003e\n\u003ctd\u003e7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e18T, 19T, 20T, 22T, 24T, 25T, 26T, 27T, 28T, 30T, 32T, 34T, 35T, 36T, 38T, 40T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 25mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Size\u003c\/th\u003e\n\u003ctd\u003e3×1.4mm \/ 4×1.8mm \/ 5×2.3mm \/ 6×2.8mm \/ 8×3.3mm (varies by bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Type\u003c\/th\u003e\n\u003ctd\u003eAF-type (flanged hub with keyway)\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\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\u003eFlange Diameter\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 (18T vs 40T)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe tooth count determines your pulley's pitch diameter and, combined with your driven pulley's tooth count, sets the drive ratio. A smaller tooth count (e.g., 18T) on the motor gives a speed reduction when paired with a larger driven pulley, increasing torque. A larger tooth count (e.g., 40T) on the motor increases output speed. Match the tooth count to your required belt loop length and center distance as well — use a belt length calculator to confirm compatibility before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat bore size should I select for my motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor or drive shaft diameter with calipers and select the matching bore. Available bores are 8mm, 10mm, 12mm, 12.7mm (1\/2\"), 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and 25mm. The 12.7mm bore is designed for imperial 1\/2\" shafts common in some stepper motors. If your shaft is metric, choose the exact metric bore — do not use an oversized bore with a sleeve unless you have a precision adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the keyway for, and do I need it?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe keyway is a rectangular slot machined into the bore that accepts a matching key (a small rectangular bar) inserted between the shaft and pulley. This creates a positive mechanical lock that prevents the pulley from rotating on the shaft under torque — something a set-screw alone cannot reliably do under reversing or high-cycle loads. If your shaft has a matching keyway cut, use the key. If your shaft is plain (no keyway), the pulley can still be mounted using the set screw, but for high-torque or reversing applications, a keyed shaft is strongly recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with HTD-3M belts as well as S3M belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eS3M and HTD-3M share the same 3mm pitch, so these pulleys are generally cross-compatible with both belt profiles. However, the tooth flank geometry differs slightly between the two standards. For light-to-medium duty applications the difference is negligible, but for high-load or precision positioning systems, use the belt and pulley from the same standard (S3M with S3M, HTD-3M with HTD-3M) to ensure optimal tooth engagement and belt life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is an aluminum pulley — can it 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 CNC, 3D printing, robotics, and small automation applications. The S3M belt standard itself is rated for relatively modest torque loads (typically up to a few Nm depending on belt width and speed), so the aluminum pulley is not the limiting factor in most S3M drive systems. For heavy industrial applications with high shock loads, consider steel pulleys instead. If you are unsure, calculate the belt drive load using your motor torque, pulley diameter, and safety factor before selecting materials.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this pulley corrode or require lubrication?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized aluminum finish provides good resistance to oxidation and mild corrosion in typical indoor environments. Timing belt drives are dry-running systems — do not apply grease or oil to the belt or pulley teeth, as lubricants attract debris and degrade belt rubber, reducing belt life and causing slippage. For outdoor or high-humidity environments, inspect the pulley periodically for surface oxidation and ensure the keyway and bore remain clean and free of moisture ingress.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I decide between this pulley and a plain-bore (non-keyway) version?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eChoose the AF-type keyway pulley when your shaft has a matching keyway cut and you need reliable torque transfer under reversing loads, high cycle counts, or moderate-to-high torque. Choose a plain-bore pulley only for very light-duty, unidirectional, low-torque applications where a set screw is sufficient. For CNC axis drives and robotics joints — the primary use cases for S3M pulleys — the keyed version is the correct choice in most scenarios.\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, Bore, and Keyway size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"S3M18T \/ 8mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52444709781778,"sku":"FXLS3M18TC7D8K3AFx1","price":14.13,"currency_code":"USD","in_stock":true},{"title":"S3M19T \/ 8mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52444709814546,"sku":"FXLS3M19TC7D8K3AFx1","price":14.13,"currency_code":"USD","in_stock":true},{"title":"S3M20T \/ 10mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52444709847314,"sku":"FXLS3M20TC7D10K3AFx1","price":14.81,"currency_code":"USD","in_stock":true},{"title":"S3M20T \/ 10mm \/ 4x1.8mm \u0026 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