{"product_id":"s3m-65-150t-timing-belt-pulley-3mm-pitch-keyway-drive-pulley-width-16mm","title":"S3M 65-150T Timing Belt Pulley Pitch 3mm With Step\/Keyway Drive Pulley Width16mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eS3M Timing Belt Pulley 3mm Pitch — Precision Keyed Drive Pulley for CNC \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your motion control build demands repeatable, slip-free power transmission, a mismatched or poorly machined pulley becomes the weakest link in the entire drivetrain. Engineers, CNC builders, and robotics hobbyists who need a reliable S3M timing belt pulley with a keyed bore will find this series covers the widest range of tooth counts and bore sizes in a single listing — eliminating the frustration of sourcing multiple SKUs.\u003c\/p\u003e\n\u003cp\u003eEach S3M timing belt pulley in this series features a 3 mm pitch (S3M profile), a 16 mm belt-contact width, and a precision-machined step\/keyway bore. Tooth counts range from 65T to 150T, with bore diameters available from 8 mm (0.31 in) to 25 mm (0.98 in). Keyway dimensions scale with bore size: 3×1.4 mm for smaller bores up to 8×3.3 mm for larger bores, ensuring a secure shaft-to-hub connection without set-screw slippage.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC router X\/Y axis drives, 3D printer extruder and gantry systems, light-duty conveyor indexing, and desktop robotic arm joints — anywhere a synchronous S3M drive pulley with a keyed bore is required for accurate positioning and repeatable motion.\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 open-end and closed-loop timing belts, 16 mm belt width. Verify shaft diameter and keyway dimensions 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\u003e3 mm S3M Pitch Profile\u003c\/strong\u003e — Matches standard S3M synchronous belts for zero-slip, backlash-minimized power transmission in precision motion systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔢\u003c\/span\u003e\u003cstrong\u003eWide Tooth Count Range (65T–150T)\u003c\/strong\u003e — Ten tooth-count options let you dial in the exact gear ratio your CNC, 3D printer, or automation project requires without custom machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cstrong\u003eStep\/Keyway Bore (8–25 mm)\u003c\/strong\u003e — Machined keyway seats lock the pulley to the shaft, preventing rotational slip under load — critical for accurate positioning in servo and stepper motor drives.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e16 mm Belt-Contact Width\u003c\/strong\u003e — Consistent flange-to-flange width across all variants ensures belt tracking stability and interchangeability within the same drivetrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eScaled Keyway Dimensions\u003c\/strong\u003e — Keyway width and depth scale proportionally with bore size (3×1.4 mm through 8×3.3 mm), following standard key sizing conventions for reliable torque transfer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eBroad Bore Selection (8–25 mm)\u003c\/strong\u003e — Nine bore sizes cover the most common stepper and servo motor shaft diameters, reducing the need for adapter sleeves or custom boring.\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 Profile\u003c\/th\u003e\n\u003ctd\u003eS3M (Synchronous, 3 mm 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\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNumber of Teeth\u003c\/th\u003e\n\u003ctd\u003e65T \/ 70T \/ 72T \/ 75T \/ 80T \/ 90T \/ 100T \/ 120T \/ 140T \/ 150T\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 \/ 17 mm \/ 19 mm \/ 20 mm \/ 25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Dimensions\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 (varies by bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub Style\u003c\/th\u003e\n\u003ctd\u003eStep hub with keyway\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish \/ Colour\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1 Pcs\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 number of teeth for my application?\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 pulley, sets the drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the reduction ratio. For example, pairing a 20T motor pulley with an 80T load pulley gives a 4:1 reduction. Use the tooth count selector above to match your required ratio.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich bore size should I select for my stepper or servo motor shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your motor shaft diameter with a caliper. NEMA 23 stepper shafts are typically 8 mm, and larger servo motors often use 10–25 mm shafts. Select the bore that matches your shaft diameter exactly — the keyway provides the positive drive connection, so a snug bore fit is important.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the keyway dimension (e.g., 5×2.3 mm) mean?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe keyway dimension is expressed as width × depth. A 5×2.3 mm keyway accepts a standard 5 mm wide key that sits 2.3 mm deep into the hub. The mating key must match both the shaft keyway and the pulley keyway dimensions. Keyway size is automatically matched to bore size in this listing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with standard S3M timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. This pulley is designed for S3M profile synchronous timing belts with a 3 mm pitch and 16 mm width. Ensure your belt is also rated for 16 mm width. S3M belts are widely available in both open-end and closed-loop configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the keyway connection — will it slip under load?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA properly fitted key and keyway provides a positive mechanical lock between shaft and pulley, transmitting torque through shear rather than friction alone. This is significantly more reliable than set-screw-only hubs for continuous or reversing loads. Ensure the key is the correct size and that the bore fits the shaft with minimal clearance for best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley in a 3D printer or CNC router?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — S3M pulleys are commonly used in CNC router gantry drives, 3D printer Z-axis drives, and desktop automation systems. The 16 mm belt width provides good load capacity for these applications. Confirm your existing belt profile is S3M (3 mm pitch) before ordering, as S3M is not interchangeable with GT2, HTD 3M, or other 3 mm pitch profiles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between S3M and HTD 3M pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBoth S3M and HTD 3M have a 3 mm pitch, but the tooth profile differs — S3M uses a trapezoidal tooth while HTD 3M uses a curvilinear (rounded) tooth. They are not interchangeable. Always match the pulley profile to your belt profile exactly.\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":"S3M65T \/ 10mm \/ 3x1.4mm \u0026 1Pcs","offer_id":52444725051666,"sku":"FXLS3M65TC16D10K3BFx1","price":47.59,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 10mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52444725084434,"sku":"FXLS3M65TC16D10K4BFx1","price":47.59,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 12mm \/ 4x1.8mm \u0026 1Pcs","offer_id":52444725117202,"sku":"FXLS3M65TC16D12K4BFx1","price":47.31,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 14mm \/ 5x2.3mm \u0026 1Pcs","offer_id":52444725149970,"sku":"FXLS3M65TC16D14K5BFx1","price":47.04,"currency_code":"USD","in_stock":true},{"title":"S3M65T \/ 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