{"product_id":"5m-timing-belt-pulley-15t-60t-af-type-synchronous-wheel","title":"5M Timing Belt Pulley 15T-60T keyway Bore AF-type 16\/21mm Belt Synchronous Wheel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e5M Timing Belt Pulley 15T–60T — AF-Type Keyway Bore for Reliable Synchronous Drive\u003c\/h2\u003e\n\u003cp\u003eWhen a slipping or misaligned drive pulley stalls your CNC router, 3D printer, or automation rig mid-run, the cost is more than downtime — it's lost precision and wasted material. Engineers, makers, and small-workshop operators who need a dependable 5M synchronous wheel with a secure keyway bore will find this pulley a direct, no-compromise solution.\u003c\/p\u003e\n\u003cp\u003eThis 5M timing belt pulley is machined from aluminum alloy and features an AF-type keyway bore design with a set-screw collar for positive shaft locking. Tooth counts range from 15T to 60T, bore diameters span 8 mm to 20 mm (approximately 0.31 in to 0.79 in), and belt widths of 16 mm (0.63 in) and 21 mm (0.83 in) are available. The 5M pitch — 5 mm (0.197 in) tooth-to-tooth — matches standard 5M synchronous belts across both metric and inch-based systems.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC axis drives requiring repeatable positioning, robotic arm joints where backlash must be minimized, and conveyor or pick-and-place systems running 5M synchronous belt loops. The wide tooth-count range also makes this pulley suitable as a speed-ratio component in custom gearless reduction stages for DIY automation projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for standard 5M pitch synchronous belts (5 mm tooth pitch). Belt width must match your selected variant — 16 mm or 21 mm. Verify shaft diameter before ordering; bore sizes and keyway dimensions are listed per variant.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 5M 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 Keyway Bore\u003c\/strong\u003e — Positive shaft engagement via keyway slot and set-screw collar eliminates rotational slip under load, keeping your drive in sync.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Tooth-Count Range (15T–60T)\u003c\/strong\u003e — Choose from seven tooth counts to dial in your exact speed ratio without custom machining or adapter plates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eDual Belt-Width Options (16 mm \/ 21 mm)\u003c\/strong\u003e — Match the pulley to your existing belt width for full tooth engagement and even load distribution across the belt face.\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 rotational inertia low, which matters in high-cycle or high-acceleration applications like pick-and-place arms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eMultiple Bore Diameters (8–20 mm)\u003c\/strong\u003e — Bore options with matching keyway dimensions (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm) cover the most common stepper and servo motor shaft sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eStandard 5M Pitch Compatibility\u003c\/strong\u003e — Tooth profile conforms to the 5M synchronous belt standard, ensuring interchangeability with off-the-shelf 5M belts from any supplier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 5M Timing Belt Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Pitch\u003c\/th\u003e\n\u003ctd\u003e5M (5 mm \/ 0.197 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e15T, 16T, 20T, 22T, 24T, 25T, 60T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e16 mm (0.63 in) or 21 mm (0.83 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 20 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eKeyway Type\u003c\/th\u003e\n\u003ctd\u003eAF-type (set-screw collar)\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 (see variant options)\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\u003eFlange\u003c\/th\u003e\n\u003ctd\u003eFlanged on both sides\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\u003eHub Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural anodized \/ machined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Standard\u003c\/th\u003e\n\u003ctd\u003e5M synchronous belt (HTD-5M or equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right tooth count (T) for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the speed reduction ratio. For example, a 15T driver paired with a 60T driven pulley gives a 4:1 reduction. If you need 1:1 (no speed change), use matching tooth counts on both pulleys. For CNC axes, 20T is a common starting point with standard 5M belts.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"AF-type\" keyway bore mean, and why does it matter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAF-type refers to a bore with a machined keyway slot and a set-screw (grub screw) collar. The keyway accepts a matching key on the shaft, preventing the pulley from rotating independently of the shaft under torque. This is more secure than a plain bore with set-screw alone, making it the preferred choice for applications with reversing loads or high acceleration.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\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\u003cp\u003eMatch the bore diameter to your motor shaft diameter exactly. Common stepper motor shaft sizes are 5 mm, 6.35 mm (1\/4 in), and 8 mm. Servo motors often use 8 mm, 10 mm, or 12 mm shafts. Also confirm the keyway dimensions match your shaft's key: the bore width label in each variant lists both the bore diameter and the keyway size (e.g., \"8mm (3×1.4mm)\").\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with HTD-5M belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 5M pitch (5 mm tooth-to-tooth spacing) used on this pulley is the same as the HTD-5M standard. It will mesh correctly with any HTD-5M synchronous belt of the matching width (16 mm or 21 mm). Ensure your belt width matches the variant you select for full tooth engagement.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a 16 mm belt with a 21 mm pulley, or vice versa?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eIt is not recommended. Using a narrower belt on a wider pulley reduces the contact area and load capacity, and the belt may track unevenly between the flanges. Always match the belt width to the pulley's belt-width specification for reliable, long-term operation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is an aluminum alloy pulley compared to steel for my use case?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty applications such as CNC routers, 3D printers, laser cutters, and small robotic arms. They offer a favorable strength-to-weight ratio and resist corrosion without surface treatment. For heavy industrial loads or continuous high-torque environments, a steel pulley would be more appropriate. If you are unsure, contact us to confirm suitability for your specific load requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDoes the pulley come with the set screw and key included?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe set screw is included with the pulley. A matching shaft key is not always included — please confirm at checkout or contact us before ordering if you need the key supplied separately. Standard key stock for these bore sizes is widely available at hardware and engineering suppliers.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Model, Belt width, and Bore width above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right tooth count (T) for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the speed reduction ratio. For example, a 15T driver paired with a 60T driven pulley gives a 4:1 reduction. If you need 1:1 (no speed change), use matching tooth counts on both pulleys. For CNC axes, 20T is a common starting point with standard 5M belts.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does AF-type keyway bore mean, and why does it matter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"AF-type refers to a bore with a machined keyway slot and a set-screw (grub screw) collar. The keyway accepts a matching key on the shaft, preventing the pulley from rotating independently of the shaft under torque. This is more secure than a plain bore with set-screw alone, making it the preferred choice for applications with reversing loads or high acceleration.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my stepper or servo motor shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bore diameter to your motor shaft diameter exactly. Common stepper motor shaft sizes are 5 mm, 6.35 mm (1\/4 in), and 8 mm. Servo motors often use 8 mm, 10 mm, or 12 mm shafts. Also confirm the keyway dimensions match your shaft's key.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this pulley compatible with HTD-5M belts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 5M pitch (5 mm tooth-to-tooth spacing) used on this pulley is the same as the HTD-5M standard. It will mesh correctly with any HTD-5M synchronous belt of the matching width (16 mm or 21 mm).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use a 16 mm belt with a 21 mm pulley, or vice versa?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It is not recommended. Using a narrower belt on a wider pulley reduces the contact area and load capacity, and the belt may track unevenly between the flanges. Always match the belt width to the pulley's belt-width specification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong is an aluminum alloy pulley compared to steel for my use case?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Aluminum alloy pulleys are well-suited for light-to-medium duty applications such as CNC routers, 3D printers, laser cutters, and small robotic arms. They offer a favorable strength-to-weight ratio and resist corrosion without surface treatment. For heavy industrial loads or continuous high-torque environments, a steel pulley would be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the pulley come with the set screw and key included?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The set screw is included with the pulley. A matching shaft key is not always included — please confirm at checkout or contact us before ordering if you need the key supplied separately.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"5M-15T \/ 16mm \/ 8mm（3x1.4mm）","offer_id":52446639784210,"sku":"TRA11994","price":7.55,"currency_code":"USD","in_stock":true},{"title":"5M-15T \/ 16mm \/ 10mm（3x1.4mm）","offer_id":52446639816978,"sku":"TRA11995","price":7.55,"currency_code":"USD","in_stock":true},{"title":"5M-15T \/ 16mm \/ 12mm（4x1.8mm）","offer_id":52446639849746,"sku":"TRA11996","price":7.55,"currency_code":"USD","in_stock":true},{"title":"5M-15T \/ 21mm \/ 8mm（3x1.4mm）","offer_id":52446639882514,"sku":"TRA11997","price":8.09,"currency_code":"USD","in_stock":true},{"title":"5M-15T \/ 21mm \/ 10mm（3x1.4mm）","offer_id":52446639915282,"sku":"TRA11998","price":8.09,"currency_code":"USD","in_stock":true},{"title":"5M-15T \/ 21mm \/ 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