{"product_id":"v-groove-aluminum-pulley-5mm-round-belt-od-20-30-40mm","title":"V Grooved Pulley Aluminum Round Belt Pulleys For 5mm Width Belt OD 20\/30\/40mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eV Groove Aluminum Pulleys for 5mm Round Belt — Precision Drive Components for Makers \u0026amp; Engineers\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control project demands consistent belt tracking and minimal slippage, a poorly matched pulley becomes the weakest link in the entire drive train. These V groove aluminum pulleys are engineered for hobbyists, robotics builders, and small-machine designers who need a reliable, dimensionally accurate sheave that locks a 5mm round belt firmly in its groove without wandering or jumping under load.\u003c\/p\u003e\n\u003cp\u003eEach pulley is machined from aluminum alloy, offering a lightweight yet rigid body with a natural resistance to corrosion. The V-profile groove is sized specifically for 5mm-width round belts, with a consistent 5mm bore through the hub. Outer diameters span three families — 20mm (~0.79 in), 30mm (~1.18 in), and 40mm (~1.57 in) — while groove widths range from 4mm to 16mm across variants, letting you match the pulley geometry to your exact belt and shaft configuration.\u003c\/p\u003e\n\u003cp\u003eTypical applications include DIY belt-drive linear actuators, desktop CNC and 3D printer axis drives, small conveyor systems, and light-duty robotic arm joints where a compact round-belt pulley with a 5mm bore is required. The aluminum construction also makes these pulleys a practical choice for camera slider rigs and educational automation kits where weight savings matter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e✅\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for 5mm round belts (O-ring profile). Bore diameter: 5mm. Fits standard 5mm shafts. Verify OD and groove width against your drive geometry before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These V Groove Aluminum Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003ePrecision V-Profile Groove\u003c\/strong\u003e\n\u003cp\u003eThe groove geometry is machined to seat a 5mm round belt securely, maintaining consistent belt tracking and reducing lateral drift during operation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🪶\u003c\/span\u003e \u003cstrong\u003eLightweight Aluminum Alloy Body\u003c\/strong\u003e\n\u003cp\u003eAluminum construction keeps rotating mass low, reducing inertia in high-cycle applications such as 3D printer axes and robotic joints.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eThree OD Families — 20 \/ 30 \/ 40mm\u003c\/strong\u003e\n\u003cp\u003eChoose the outer diameter that matches your required speed ratio. Groove widths from 4mm to 16mm give additional flexibility for different belt lengths and wrap angles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e5mm Through-Bore for Standard Shafts\u003c\/strong\u003e\n\u003cp\u003eThe 5mm bore fits widely available motor shafts and lead-screw diameters, simplifying integration into existing drive assemblies without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant Finish\u003c\/strong\u003e\n\u003cp\u003eAluminum's natural oxide layer provides adequate corrosion resistance for indoor and light-industrial environments, keeping the pulley serviceable over extended use cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSold Individually — Mix Sizes as Needed\u003c\/strong\u003e\n\u003cp\u003eEach listing unit is a single pulley, allowing you to order exactly the OD and groove-width combination your project requires without paying for unwanted extras.\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 — V Groove Aluminum Pulley\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eGroove Profile\u003c\/th\u003e\n\u003ctd\u003eV-groove (round belt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBelt Width Compatibility\u003c\/th\u003e\n\u003ctd\u003e5mm round belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20mm \/ 30mm \/ 40mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Width\u003c\/th\u003e\n\u003ctd\u003e4mm – 16mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHub \/ Body Thickness\u003c\/th\u003e\n\u003ctd\u003e5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Unit\u003c\/th\u003e\n\u003ctd\u003e1 piece\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\u003eWhich belt type is compatible with these pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese pulleys are designed exclusively for \u003cstrong\u003e5mm round belts\u003c\/strong\u003e (also called O-ring drive belts). The V-profile groove is sized to seat a 5mm-diameter round cross-section belt. Flat belts, V-belts with trapezoidal profiles, or timing belts are not compatible with this groove geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right outer diameter (OD) for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe OD determines your drive ratio when paired with a second pulley. A larger OD on the driven pulley reduces output speed and increases torque; a smaller OD does the opposite. Measure the center-to-center shaft distance and your required belt length, then use a pulley-ratio calculator to confirm the OD combination before ordering. Available ODs are 20mm, 30mm, and 40mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat groove width should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe groove width affects how much of the belt sits inside the groove and influences belt retention. For a standard 5mm round belt, groove widths in the 5–8mm range typically provide good retention. Wider grooves (10–16mm) may be used when the belt needs more lateral clearance or when the pulley is used as an idler. Check your belt supplier's recommendation for the specific belt diameter you are using.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill a 5mm bore fit my motor shaft directly?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe bore is 5mm in diameter. If your motor or drive shaft is exactly 5mm, the pulley should slide on with a light press or clearance fit depending on machining tolerance. For a secure connection, a set screw, retaining pin, or shaft collar is recommended. If your shaft is a different diameter, a bore adapter or custom machining would be required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these pulleys strong enough for continuous-duty applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum alloy provides a good strength-to-weight ratio suitable for light-to-medium duty continuous operation such as 3D printer axes, camera sliders, and small conveyor drives. For heavy-load or high-shock applications, verify that the aluminum grade and wall thickness meet your torque and radial load requirements. Contact us to confirm specifications if you have specific load data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these pulleys resist corrosion in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAluminum naturally forms a thin oxide layer that provides adequate corrosion resistance for indoor and light-industrial environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, an additional anodized or coated finish would offer better protection. These pulleys are not rated for marine or outdoor weathering applications without additional surface treatment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as idler pulleys rather than driven pulleys?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. V groove pulleys are commonly used as idlers to guide and tension a round belt. When used as an idler, the bore can be fitted with a bearing (5mm ID bearing) to allow free rotation on a fixed shaft. Ensure the bearing outer diameter matches the bore, or use a bearing with a 5mm inner race and press it into a suitable housing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Size (OD × Groove Width) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20mm x 5mm x 5mm \/ 1","offer_id":52445337288978,"sku":"XYHGY-PUL2601-03-001x1","price":4.96,"currency_code":"USD","in_stock":true},{"title":"20mm x 6mm x 5mm \/ 1","offer_id":52445337321746,"sku":"XYHGY-PUL2601-03-002x1","price":4.96,"currency_code":"USD","in_stock":true},{"title":"20mm x 7mm x 5mm \/ 1","offer_id":52445337354514,"sku":"XYHGY-PUL2601-03-003x1","price":4.96,"currency_code":"USD","in_stock":true},{"title":"20mm x 8mm x 5mm \/ 1","offer_id":52445337387282,"sku":"XYHGY-PUL2601-03-004x1","price":4.96,"currency_code":"USD","in_stock":true},{"title":"30mm x 4mm x 5mm \/ 1","offer_id":52445337420050,"sku":"XYHGY-PUL2601-03-005x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 5mm x 5mm \/ 1","offer_id":52445337452818,"sku":"XYHGY-PUL2601-03-006x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 6mm x 5mm \/ 1","offer_id":52445337485586,"sku":"XYHGY-PUL2601-03-007x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 7mm x 5mm \/ 1","offer_id":52445337518354,"sku":"XYHGY-PUL2601-03-008x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 8mm x 5mm \/ 1","offer_id":52445337551122,"sku":"XYHGY-PUL2601-03-009x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 10mm x 5mm \/ 1","offer_id":52445337583890,"sku":"XYHGY-PUL2601-03-010x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 11mm x 5mm \/ 1","offer_id":52445337616658,"sku":"XYHGY-PUL2601-03-011x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 12mm x 5mm \/ 1","offer_id":52445337649426,"sku":"XYHGY-PUL2601-03-012x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 14mm x 5mm \/ 1","offer_id":52445337682194,"sku":"XYHGY-PUL2601-03-013x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 15mm x 5mm \/ 1","offer_id":52445337714962,"sku":"XYHGY-PUL2601-03-014x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"30mm x 16mm x 5mm \/ 1","offer_id":52445337747730,"sku":"XYHGY-PUL2601-03-015x1","price":5.92,"currency_code":"USD","in_stock":true},{"title":"40mm x 4mm x 5mm \/ 1","offer_id":52445337780498,"sku":"XYHGY-PUL2601-03-016x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 5mm x 5mm \/ 1","offer_id":52445337813266,"sku":"XYHGY-PUL2601-03-017x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 6mm x 5mm \/ 1","offer_id":52445337846034,"sku":"XYHGY-PUL2601-03-018x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 7mm x 5mm \/ 1","offer_id":52445337878802,"sku":"XYHGY-PUL2601-03-019x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 8mm x 5mm \/ 1","offer_id":52445337911570,"sku":"XYHGY-PUL2601-03-020x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 10mm x 5mm \/ 1","offer_id":52445337944338,"sku":"XYHGY-PUL2601-03-021x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 11mm x 5mm \/ 1","offer_id":52445337977106,"sku":"XYHGY-PUL2601-03-022x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 12mm x 5mm \/ 1","offer_id":52445338009874,"sku":"XYHGY-PUL2601-03-023x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 14mm x 5mm \/ 1","offer_id":52445338042642,"sku":"XYHGY-PUL2601-03-024x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 15mm x 5mm \/ 1","offer_id":52445338075410,"sku":"XYHGY-PUL2601-03-025x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"40mm x 16mm x 5mm \/ 1","offer_id":52445338108178,"sku":"XYHGY-PUL2601-03-026x1","price":7.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture3of29_d4ded456-8501-4548-b570-53f9c370cec7.jpg?v=1783607917","url":"https:\/\/homediyer.com\/products\/v-groove-aluminum-pulley-5mm-round-belt-od-20-30-40mm","provider":"HomeDIYer","version":"1.0","type":"link"}