{"product_id":"s2m-28-50t-timing-pulley-10mm-belt-synchronous-wheel-gear-3d-printer-bore-4-15mm","title":"S2M 28-50T Timing Pulley 10mm Belt Synchronous Wheel Gear 3D Printer Bore 4-15mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eS2M Timing Pulley 28–50T — Precision Synchronous Drive for 3D Printers \u0026amp; CNC Systems\u003c\/h2\u003e\n\u003cp\u003eWhen your motion system slips, skips, or loses steps, the culprit is often an undersized or poorly machined synchronous pulley. Engineers, makers, and 3D printer builders who demand repeatable, backlash-free motion need a timing pulley that holds tolerance across thousands of cycles — not one that wears out after a few weeks of continuous use.\u003c\/p\u003e\n\u003cp\u003eThese S2M timing pulleys are machined from aluminum alloy with an anodized finish, covering tooth counts from 28T to 50T and a 10mm belt width (S2M pitch: 2mm). Bore options span 4mm to 15mm (approximately 0.157\" to 0.591\"), including metric keyway variants (3mm and 4mm keyways) and imperial 6.35mm \/ 12.7mm bores for compatibility with North American motor shafts. Hub flange width is approximately 11mm.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include FDM 3D printer X\/Y axis drives (S2M-28T to S2M-40T range), compact CNC router feed axes, robotic arm joint actuators, and light-duty conveyor synchronization systems where a 2mm pitch belt provides the right balance of speed and torque transmission.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eBelt Compatibility:\u003c\/strong\u003e S2M open-end or closed-loop timing belts, 10mm width — 2mm pitch. Verify center distance and tooth count before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These S2M Timing Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eWide Tooth Count Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in 14 sizes from 28T to 50T (28, 30, 32, 34, 35, 36, 38, 40, 42, 44, 45, 46, 48, 50 teeth), covering a broad gear ratio selection for single-stage drive design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e \u003cstrong\u003ePrecision-Machined Bore\u003c\/strong\u003e\n\u003cp\u003eBore options from 4mm to 15mm including 6.35mm and 12.7mm imperial sizes. Keyway variants (3mm and 4mm) available for positive shaft locking without set-screw slip.\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\u003eMachined aluminum body keeps rotating mass low — critical for 3D printer acceleration performance and responsive CNC axis movement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eS2M Standard Profile\u003c\/strong\u003e\n\u003cp\u003e2mm pitch tooth profile conforms to S2M belt standard. Hub flange width approximately 11mm keeps the belt tracked without additional guides on most applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eSet Screw Retention (Plain Bore)\u003c\/strong\u003e\n\u003cp\u003ePlain bore variants include a set screw for shaft retention. Keyway variants provide additional torque capacity for higher-load drive stages.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖨️\u003c\/span\u003e \u003cstrong\u003e3D Printer \u0026amp; Robotics Ready\u003c\/strong\u003e\n\u003cp\u003eTooth geometry and bore range match common NEMA 17 \/ NEMA 23 motor shaft diameters (5mm, 6.35mm, 8mm), making these a direct fit for CoreXY, Cartesian, and delta printer architectures.\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 — S2M Timing Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Standard\u003c\/th\u003e\n\u003ctd\u003eS2M (2mm pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e28T \/ 30T \/ 32T \/ 34T \/ 35T \/ 36T \/ 38T \/ 40T \/ 42T \/ 44T \/ 45T \/ 46T \/ 48T \/ 50T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e4 \/ 5 \/ 6 \/ 6.35 \/ 8 \/ 10 \/ 12 \/ 12.7 \/ 14 \/ 15mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Options\u003c\/th\u003e\n\u003ctd\u003e3mm keyway (8mm, 10mm bore) \/ 4mm keyway (10mm, 12mm bore) \/ 5mm keyway (12.7mm, 14mm, 15mm bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Flange Width\u003c\/th\u003e\n\u003ctd\u003eApproximately 11mm\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 (natural \/ silver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (28T)\u003c\/th\u003e\n\u003ctd\u003eApproximately 17.83mm (0.702\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePitch Diameter (50T)\u003c\/th\u003e\n\u003ctd\u003eApproximately 31.83mm (1.253\")\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\u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\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\u003eTooth count determines your drive ratio and pitch diameter. A smaller pulley (e.g., 28T) on the motor paired with a larger pulley on the driven shaft reduces speed and increases torque. For 3D printers, 20T–40T on the motor is typical; this 28–50T range suits both motor-side and idler\/driven-side roles. Calculate pitch diameter as: PD = (Teeth × Pitch) \/ π. For S2M: PD(mm) = Teeth × 2 \/ π.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size fits a NEMA 17 stepper motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStandard NEMA 17 motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a D-cut shaft, the set screw in the plain bore variant will engage the flat. For NEMA 23 motors, the shaft is typically 6.35mm (1\/4\") — select the 6.35mm bore variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need a keyway variant, or will a set screw hold?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor light-duty applications like 3D printer axes, a set screw on a plain bore is generally sufficient. For higher-torque applications — CNC feed drives, conveyor systems, or any axis subject to reversing loads — a keyway variant provides positive mechanical engagement and prevents rotational slip under load spikes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with GT2 belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eNo. S2M and GT2 both use a 2mm pitch, but the tooth profile geometry differs. S2M uses a trapezoidal tooth form while GT2 uses a curvilinear profile. Mixing S2M pulleys with GT2 belts (or vice versa) will cause accelerated belt wear and potential skipping. Always match pulley and belt to the same standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the corrosion resistance of these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe aluminum alloy body with anodized finish provides good resistance to oxidation and light moisture exposure, suitable for indoor workshop and printer enclosure environments. These pulleys are not rated for continuous outdoor exposure or chemically aggressive environments. For such conditions, consider stainless steel alternatives.\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?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a two-pulley open drive: Belt Length ≈ 2C + π(D₁ + D₂)\/2 + (D₁ − D₂)²\/(4C), where C is center distance and D₁, D₂ are pitch diameters. For closed-loop (toothed) belts, the tooth count must be a whole number. Use an online belt length calculator with S2M parameters, or contact us with your center distance and pulley sizes for a recommendation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these pulleys as idlers without a bore shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed as driven or driving pulleys with a through-bore for shaft mounting. They are not configured as flanged idlers with bearings. If you need a belt idler, you would need to mount this pulley on a shaft with appropriate bearings. Smooth-face idler pulleys are a separate product category.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your tooth count 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":"S2M-28Teeth \/ 4mm","offer_id":52445327950098,"sku":"GLFBLFFS2M28TC11D4BFx1","price":4.45,"currency_code":"USD","in_stock":true},{"title":"S2M-28Teeth \/ 5mm","offer_id":52445327982866,"sku":"GLFBLFFS2M28TC11D5BFx1","price":4.45,"currency_code":"USD","in_stock":true},{"title":"S2M-28Teeth \/ 6mm","offer_id":52445328015634,"sku":"GLFBLFFS2M28TC11D6BFx1","price":4.45,"currency_code":"USD","in_stock":true},{"title":"S2M-28Teeth \/ 6.35mm","offer_id":52445328048402,"sku":"GLFBLFFS2M28TC11D6.35BFx1","price":4.45,"currency_code":"USD","in_stock":true},{"title":"S2M-28Teeth \/ 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