{"product_id":"h-type-timing-belt-idler-pulley-12-7mm-pitch-27mm-width-toothed-tensioner","title":"H-Type Timing Belt Idler Pulley Pitch 12.7mm CNC Toothed Tensioner Width 27mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eH-Type Timing Belt Idler Pulley — Precision Toothed Tensioner for 12.7mm Pitch Drives\u003c\/h2\u003e\n    \u003cp\u003eWhen your timing belt drive loses tension mid-project, the entire motion system suffers — skipped steps, misaligned axes, and wasted material. Whether you are building a CNC router, a 3D printer gantry, or an industrial conveyor, a reliable toothed idler pulley is the component that keeps belt tension consistent and your drive train running true. This H-type toothed idler pulley is engineered for makers, automation engineers, and workshop builders who need a drop-in tensioner that holds up under continuous load.\u003c\/p\u003e\n    \u003cp\u003eEach pulley is CNC-machined from aluminum alloy, featuring a toothed profile matched to the H-series timing belt standard (12.7mm \/ 0.500 in pitch). The belt contact width is 27mm (approximately 1.06 in), and the bore diameter ranges across variants from 10mm to 30mm (0.39 in – 1.18 in), accommodating a wide range of shaft sizes. Tooth counts available span H12T through H20T, allowing you to fine-tune wrap angle and tension geometry for your specific drive layout.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include CNC routing machines requiring consistent X\/Y axis belt tension, DIY 3D printer belt path optimization with a toothed idler tensioner pulley, and light industrial conveyor or pick-and-place automation systems using H-series synchronous belt drives. The toothed contact surface prevents belt tooth jumping under load — a critical advantage over smooth idlers in high-torque or high-speed applications.\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    Compatible with standard \u003cstrong\u003eH-series timing belts\u003c\/strong\u003e (12.7mm \/ 0.500 in pitch, up to 27mm \/ 1.06 in wide). Verify your shaft diameter matches the selected bore variant before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These H-Type Timing Belt Idler Pulleys\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-list\"\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eCNC-Machined Toothed Profile\u003c\/strong\u003e — Tooth geometry is precision-cut to match the H-series 12.7mm pitch standard, ensuring full tooth engagement with your belt and eliminating slip under dynamic loads.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003eWide Bore Range (10–30mm)\u003c\/strong\u003e — Available bore diameters from 10mm to 30mm (0.39–1.18 in) let you mount directly onto common shaft sizes without custom machining or adapters.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🦾\u003c\/span\u003e\n        \u003cstrong\u003eMultiple Tooth Count Options (H12T–H20T)\u003c\/strong\u003e — Choose from H12T, H14T, H15T, H16T, H18T, or H20T to optimize wrap angle, belt tension, and drive geometry for your specific application.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003e27mm Belt Width Compatibility\u003c\/strong\u003e — The 27mm (1.06 in) belt contact width matches standard H-series belt widths, providing full-face contact for even load distribution and reduced belt edge wear.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\n        \u003cstrong\u003eLightweight Aluminum Construction\u003c\/strong\u003e — Machined from aluminum alloy for a favorable strength-to-weight ratio, reducing rotational inertia in high-speed drive systems while maintaining structural rigidity.\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eDrop-In Tensioner Replacement\u003c\/strong\u003e — Designed as a direct-fit idler tensioner for H-series belt drives in CNC machines, 3D printers, and automation equipment — select your tooth count and bore, and install.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — H-Type Timing Belt Idler Pulley\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Type\u003c\/th\u003e\n\u003ctd\u003eH-Series Synchronous Timing Belt\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch\u003c\/th\u003e\n\u003ctd\u003e12.7mm (0.500 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBelt Width\u003c\/th\u003e\n\u003ctd\u003e27mm (1.06 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003eH12T \/ H14T \/ H15T \/ H16T \/ H18T \/ H20T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e10mm \/ 12mm \/ 15mm \/ 17mm \/ 20mm \/ 25mm \/ 30mm (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\u003ePulley Type\u003c\/th\u003e\n\u003ctd\u003eToothed Idler \/ Tensioner\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 Order\u003c\/th\u003e\n\u003ctd\u003e1 Piece\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural \/ Anodized Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC Machines, 3D Printers, Conveyor Systems, Automation Equipment\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 (H12T, H14T, H15T, H16T, H18T, H20T)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe tooth count determines the pulley's pitch diameter and affects the wrap angle of the belt around the idler. A higher tooth count gives a larger diameter, which can improve belt wrap and reduce bending stress on the belt. For most CNC and 3D printer tensioner applications, H12T–H16T are common choices. If you need a larger wrap angle or are working with a longer belt span, H18T or H20T may be more appropriate. Match the tooth count to your drive geometry and available mounting space.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich bore size should I select for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the bore diameter that matches your shaft diameter exactly. Available bores are 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, and 30mm. If your shaft is metric, choose the matching size. If you are using an imperial shaft, convert to the nearest metric equivalent and verify fit before final assembly. A bore that is too large will require a bushing or set-screw collar to secure properly.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this pulley compatible with all H-series timing belts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — this pulley is designed for standard H-series synchronous timing belts with a 12.7mm (0.500 in) pitch. The belt contact width is 27mm, so it is best paired with H-series belts up to 27mm wide (e.g., H075, H100 width designations). Confirm your belt's pitch and width before ordering to ensure full tooth engagement across the belt face.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy use a toothed idler instead of a smooth (flat) idler pulley?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA toothed idler engages the belt teeth directly, preventing the belt from riding up or skipping under load. This is especially important in high-torque or high-speed applications where a smooth idler could allow the belt to slip laterally or lose tooth engagement. For CNC routing and 3D printing where positional accuracy matters, a toothed idler tensioner provides more consistent tension and better belt tracking than a smooth alternative.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat material is the pulley made from, and how durable is it?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pulley is CNC-machined from aluminum alloy, which offers a good balance of strength, low weight, and corrosion resistance for indoor mechanical applications. Aluminum is suitable for the load levels typical of CNC machines, 3D printers, and light automation equipment. For environments with exposure to moisture or chemicals, consider applying a light lubricant or protective coating to the bore and mounting surfaces.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use this pulley as a drive pulley instead of an idler?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThis pulley is designed and listed as an idler\/tensioner component. While the toothed profile is geometrically compatible with H-series belts, idler pulleys are typically not keyed or designed to transmit torque from a shaft. If you need a drive pulley (one that is keyed or set-screwed to a motor shaft to transmit torque), please look for a dedicated H-type drive pulley with a keyway or set-screw specification.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many pieces are included per order?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach order includes 1 piece (1Pcs) as shown in the Amount variant option. If you need multiple pulleys for a multi-axis machine or a complete tensioner kit, simply increase the quantity in your cart or place multiple orders for different bore\/tooth count combinations.\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 \u003cstrong\u003eNumber of Teeth\u003c\/strong\u003e and \u003cstrong\u003eBore\u003c\/strong\u003e 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 (H12T, H14T, H15T, H16T, H18T, H20T)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The tooth count determines the pulley's pitch diameter and affects the wrap angle of the belt around the idler. A higher tooth count gives a larger diameter, which can improve belt wrap and reduce bending stress on the belt. For most CNC and 3D printer tensioner applications, H12T–H16T are common choices. If you need a larger wrap angle or are working with a longer belt span, H18T or H20T may be more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which bore size should I select for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the bore diameter that matches your shaft diameter exactly. Available bores are 10mm, 12mm, 15mm, 17mm, 20mm, 25mm, and 30mm. A bore that is too large will require a bushing or set-screw collar to secure properly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this pulley compatible with all H-series timing belts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — this pulley is designed for standard H-series synchronous timing belts with a 12.7mm (0.500 in) pitch. The belt contact width is 27mm, so it is best paired with H-series belts up to 27mm wide. Confirm your belt's pitch and width before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why use a toothed idler instead of a smooth (flat) idler pulley?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A toothed idler engages the belt teeth directly, preventing the belt from riding up or skipping under load. This is especially important in high-torque or high-speed applications where a smooth idler could allow the belt to slip laterally or lose tooth engagement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What material is the pulley made from, and how durable is it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The pulley is CNC-machined from aluminum alloy, which offers a good balance of strength, low weight, and corrosion resistance for indoor mechanical applications. Suitable for CNC machines, 3D printers, and light automation equipment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use this pulley as a drive pulley instead of an idler?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This pulley is designed as an idler\/tensioner component. Idler pulleys are typically not keyed or designed to transmit torque from a shaft. For a drive pulley, look for a dedicated H-type drive pulley with a keyway or set-screw specification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many pieces are included per order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each order includes 1 piece (1Pcs). If you need multiple pulleys, increase the quantity in your cart or place multiple orders for different bore\/tooth count combinations.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"H12T \/ 10mm \/ 1Pcs","offer_id":52446512021778,"sku":"FXLH12TC27D10YFx1","price":38.32,"currency_code":"USD","in_stock":true},{"title":"H12T \/ 12mm \/ 1Pcs","offer_id":52446512054546,"sku":"FXLH12TC27D12YFx1","price":38.05,"currency_code":"USD","in_stock":true},{"title":"H12T \/ 15mm \/ 1Pcs","offer_id":52446512087314,"sku":"FXLH12TC27D15YFx1","price":37.67,"currency_code":"USD","in_stock":true},{"title":"H14T \/ 10mm \/ 1Pcs","offer_id":52446512120082,"sku":"FXLH14TC27D10YFx1","price":45.02,"currency_code":"USD","in_stock":true},{"title":"H14T \/ 12mm \/ 1Pcs","offer_id":52446512152850,"sku":"FXLH14TC27D12YFx1","price":44.74,"currency_code":"USD","in_stock":true},{"title":"H14T \/ 15mm \/ 1Pcs","offer_id":52446512185618,"sku":"FXLH14TC27D15YFx1","price":44.31,"currency_code":"USD","in_stock":true},{"title":"H15T \/ 10mm \/ 1Pcs","offer_id":52446512218386,"sku":"FXLH15TC27D10YFx1","price":48.93,"currency_code":"USD","in_stock":true},{"title":"H15T \/ 12mm \/ 1Pcs","offer_id":52446512251154,"sku":"FXLH15TC27D12YFx1","price":48.66,"currency_code":"USD","in_stock":true},{"title":"H15T \/ 15mm \/ 1Pcs","offer_id":52446512283922,"sku":"FXLH15TC27D15YFx1","price":48.28,"currency_code":"USD","in_stock":true},{"title":"H16T \/ 10mm \/ 1Pcs","offer_id":52446512316690,"sku":"FXLH16TC27D10YFx1","price":53.18,"currency_code":"USD","in_stock":true},{"title":"H16T \/ 12mm \/ 1Pcs","offer_id":52446512349458,"sku":"FXLH16TC27D12YFx1","price":52.9,"currency_code":"USD","in_stock":true},{"title":"H16T \/ 15mm \/ 1Pcs","offer_id":52446512382226,"sku":"FXLH16TC27D15YFx1","price":52.47,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 10mm \/ 1Pcs","offer_id":52446512414994,"sku":"FXLH18TC27D10YFx1","price":64.71,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 15mm \/ 1Pcs","offer_id":52446512447762,"sku":"FXLH18TC27D15YFx1","price":64.16,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 17mm \/ 1Pcs","offer_id":52446512480530,"sku":"FXLH18TC27D17YFx1","price":63.78,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 20mm \/ 1Pcs","offer_id":52446512513298,"sku":"FXLH18TC27D20YFx1","price":63.08,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 25mm \/ 1Pcs","offer_id":52446512546066,"sku":"FXLH18TC27D25YFx1","price":61.88,"currency_code":"USD","in_stock":true},{"title":"H18T \/ 30mm \/ 1Pcs","offer_id":52446512578834,"sku":"FXLH18TC27D30YFx1","price":60.36,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 10mm \/ 1Pcs","offer_id":52446512611602,"sku":"FXLH20TC27D10YFx1","price":75.04,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 15mm \/ 1Pcs","offer_id":52446512644370,"sku":"FXLH20TC27D15YFx1","price":74.39,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 17mm \/ 1Pcs","offer_id":52446512677138,"sku":"FXLH20TC27D17YFx1","price":73.96,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 20mm \/ 1Pcs","offer_id":52446512709906,"sku":"FXLH20TC27D20YFx1","price":73.41,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 25mm \/ 1Pcs","offer_id":52446512742674,"sku":"FXLH20TC27D25YFx1","price":72.22,"currency_code":"USD","in_stock":true},{"title":"H20T \/ 30mm \/ 1Pcs","offer_id":52446512775442,"sku":"FXLH20TC27D30YFx1","price":70.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_c5fb0594-7438-4319-9a93-78b99be5e18e.jpg?v=1784053122","url":"https:\/\/homediyer.com\/products\/h-type-timing-belt-idler-pulley-12-7mm-pitch-27mm-width-toothed-tensioner","provider":"HomeDIYer","version":"1.0","type":"link"}