{"product_id":"5m-timing-belt-smooth-tooth-idler-drive-pulley-18t-width-11-16-21-27-bore-5-15m","title":"5M Timing Belt Smooth Tooth Idler Drive Pulley  18T Width 11\/16\/21\/27 Bore 5-15m","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e5M Timing Belt Idler Drive Pulley 18T — Smooth or Toothed for Reliable Belt Tensioning\u003c\/h2\u003e\n\u003cp\u003eWhen a 5M timing belt system loses tension or runs misaligned, the entire drive train suffers — skipped teeth, premature belt wear, and costly downtime follow. Engineers, CNC builders, and automation integrators who need a dependable 5M timing belt idler drive pulley with flexible bore and slot width options will find this 18-tooth pulley a practical, drop-in solution.\u003c\/p\u003e\n\u003cp\u003eThis idler pulley is available in two styles — smooth (without teeth) for pure tensioning duty and toothed (with teeth, 18T) for driven or guided belt contact. The body is machined from aluminum alloy with a natural or anodized finish. Slot widths span 11 mm, 16 mm, 21 mm, and 27 mm (approx. 0.43 in, 0.63 in, 0.83 in, and 1.06 in) to match standard 5M belt widths. Bore sizes range from 5 mm to 15 mm (approx. 0.20 in to 0.59 in) to suit common shaft diameters.\u003c\/p\u003e\n\u003cp\u003eTypical applications include CNC router and laser cutter belt tensioning, industrial conveyor drive systems requiring a 5M idler pulley with adjustable bore, and compact automation machinery where a toothed or smooth idler pulley for 5M pitch belt is needed to maintain consistent belt path geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e Compatible with standard \u003cstrong\u003e5M pitch timing belts\u003c\/strong\u003e. Match slot width to your belt width (11 \/ 16 \/ 21 \/ 27 mm) and bore size to your shaft diameter (5–15 mm). Confirm flange clearance before installation.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 5M Timing Belt Idler Drive Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e🔩\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eTwo Functional Styles\u003c\/strong\u003e\n\u003cp\u003eChoose \u003cem\u003eWithout Teeth\u003c\/em\u003e (smooth bore idler) for pure belt tensioning and back-side contact, or \u003cem\u003eWith Teeth\u003c\/em\u003e (18T toothed) for positive belt engagement on driven or guided runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e📐\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eFour Slot Width Options\u003c\/strong\u003e\n\u003cp\u003eAvailable in 11 mm, 16 mm, 21 mm, and 27 mm slot widths to match the most common 5M belt widths without modification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e🎯\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eWide Bore Range: 5–15 mm\u003c\/strong\u003e\n\u003cp\u003eSeven bore sizes (5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 12 \/ 15 mm) cover the majority of standard motor and idler shaft diameters used in CNC and automation builds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e🏗️\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eAluminum Alloy Construction\u003c\/strong\u003e\n\u003cp\u003eMachined aluminum body keeps rotating mass low while providing sufficient rigidity for continuous-duty belt drive applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e⚖️\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLightweight for Dynamic Systems\u003c\/strong\u003e\n\u003cp\u003eReduced rotational inertia compared to steel pulleys supports faster acceleration and deceleration cycles in servo and stepper-driven systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e\n\u003cspan\u003e🔄\u003c\/span\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eBroad Compatibility\u003c\/strong\u003e\n\u003cp\u003eDesigned for standard 5M pitch timing belts used across CNC routers, laser cutters, conveyor systems, and general industrial automation equipment.\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 — 5M Timing Belt Idler 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 pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTooth Count\u003c\/th\u003e\n\u003ctd\u003e18T (toothed style) \/ Smooth (without teeth style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSlot Width\u003c\/th\u003e\n\u003ctd\u003e11 mm \/ 16 mm \/ 21 mm \/ 27 mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Size\u003c\/th\u003e\n\u003ctd\u003e5 \/ 6 \/ 7 \/ 8 \/ 10 \/ 12 \/ 15 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\u003eFinish\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\u003eFlange\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eCNC, conveyor, automation, laser cutter belt drives\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\u003eWhat is the difference between the \"With Teeth\" and \"Without Teeth\" styles?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eWithout Teeth\u003c\/strong\u003e (smooth) style is used as a pure idler or tensioner — the belt rides on the smooth outer surface, typically on the back (non-toothed) side of the belt. The \u003cstrong\u003eWith Teeth\u003c\/strong\u003e (18T) style meshes with the belt's tooth profile and is used where the pulley needs to positively guide or drive the belt on its toothed face.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the correct slot width?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe slot width should match your belt's width. For example, if you are using a 15 mm wide 5M belt, select the 16 mm slot width for a snug fit with minimal lateral play. Refer to your belt's datasheet for the exact width and choose the nearest slot width option (11 \/ 16 \/ 21 \/ 27 mm).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the right bore size for my shaft?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter precisely with a caliper and select the matching bore size. Available bores are 5, 6, 7, 8, 10, 12, and 15 mm. If your shaft uses a keyway or set screw, confirm the pulley hub depth is sufficient for your fastening method before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with all 5M timing belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — this pulley is designed for the standard 5M pitch (5 mm tooth pitch) timing belt profile used across CNC routers, laser cutters, conveyor systems, and general automation equipment. Verify that your belt's width matches the selected slot width variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is the aluminum construction for continuous-duty use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy pulleys are well-suited for light-to-medium duty continuous operation in CNC and automation environments. For heavy-load or high-temperature industrial applications where steel is specified, please contact us to confirm suitability before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes aluminum corrode in humid or outdoor environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid, wet, or outdoor installations, an anodized finish variant (where available) offers improved surface protection. Contact us to confirm finish options for your specific environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley as both a tensioner and a drive pulley?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe smooth (Without Teeth) style is intended for tensioning and back-side belt contact only — it should not be used as a primary drive pulley. The toothed (With Teeth, 18T) style can function as a secondary drive or guided pulley where positive belt engagement is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Style, Slot width, and Bore size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Without Teeth \/ 11mm \/ 5mm","offer_id":52444056289554,"sku":"LXXYYDS2669x1","price":13.03,"currency_code":"USD","in_stock":true},{"title":"Without Teeth \/ 11mm \/ 6mm","offer_id":52444056322322,"sku":"LXXYYDS2670x1","price":13.03,"currency_code":"USD","in_stock":true},{"title":"Without Teeth \/ 11mm \/ 7mm","offer_id":52444056355090,"sku":"LXXYYDS2671x1","price":13.03,"currency_code":"USD","in_stock":true},{"title":"Without Teeth \/ 11mm \/ 8mm","offer_id":52444056387858,"sku":"LXXYYDS2672x1","price":13.03,"currency_code":"USD","in_stock":true},{"title":"Without Teeth 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