{"product_id":"aluminium-v-groove-pulley-od-20-100mm-fixed-screw-5mm-6mm-belt","title":"OD 20mm-100mm Aluminium V-Groove Pulley With Fixed Screw for 5mm\/6mm Width Belt","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eAluminium V-Groove Pulley — Precise Belt Tracking for CNC, Robotics \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen your motion-control build demands consistent belt alignment and zero slippage, a poorly fitted pulley becomes the weakest link. Engineers, makers, and automation integrators working on CNC routers, 3D printers, laser cutters, and conveyor systems need a pulley that locks firmly to the shaft and keeps the belt seated under load — every cycle, every time.\u003c\/p\u003e\n\u003cp\u003eThese aluminium V-groove pulleys feature a machined 6061-series aluminium body with a clean V-profile groove sized for 5 mm or 6 mm wide belts. Outer diameters span 20 mm to 100 mm (approximately 0.79 in to 3.94 in), and bore sizes range from 5 mm to 25 mm (approximately 0.20 in to 0.98 in) to suit a wide variety of motor and idler shaft diameters. Each pulley ships with a radial set screw that clamps directly onto the shaft for a secure, tool-adjustable fit.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include open-loop belt-drive axes on desktop CNC mills, tensioner idler assemblies in 3D printer CoreXY kinematics, and lightweight conveyor drive stations in small-batch automation rigs. The aluminium construction keeps rotating mass low — a key factor in high-acceleration stepper and servo applications where inertia directly affects positioning accuracy.\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 5 mm and 6 mm wide V-belts or round belts. Verify your shaft diameter against the selected bore size before ordering. Set screw secures to plain or flat-keyed shafts.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Aluminium V-Groove Pulleys\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eWide OD Range: 20 mm – 100 mm\u003c\/strong\u003e\n\u003cp\u003eChoose the exact drive ratio you need. OD options from 20 mm (0.79 in) to 100 mm (3.94 in) let you dial in speed reduction or 1:1 drive without custom machining.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eIntegrated Set Screw Retention\u003c\/strong\u003e\n\u003cp\u003eA radial set screw is pre-installed in each pulley hub. Tighten with a standard hex key to lock the pulley onto the shaft — no adhesive, no press-fit tools required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cstrong\u003eMachined Aluminium Body\u003c\/strong\u003e\n\u003cp\u003eLightweight yet rigid aluminium construction reduces rotational inertia for faster acceleration in stepper and servo-driven axes while resisting deformation under belt tension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003ePrecision V-Groove Profile\u003c\/strong\u003e\n\u003cp\u003eThe groove geometry is machined to maintain consistent belt contact and lateral tracking, minimising belt wander and reducing wear on both the belt and pulley flanks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n\u003cstrong\u003eMultiple Bore Sizes Available\u003c\/strong\u003e\n\u003cp\u003eBore options from 5 mm to 25 mm cover common motor shaft diameters used in NEMA 17, NEMA 23, and equivalent servo motors, as well as idler rod diameters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eDrop-In Fit for Standard Belt Widths\u003c\/strong\u003e\n\u003cp\u003eGroove width is matched to 5 mm and 6 mm belts — the two most common widths in desktop CNC and 3D printer motion systems — so no modification is needed out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — V-Groove Pulley\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminium alloy (6061-series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20 mm \/ 30 mm \/ 40 mm \/ 50 mm \/ 60 mm \/ 80 mm \/ 100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options (5 mm – 25 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Belt Width\u003c\/th\u003e\n\u003ctd\u003e5 mm, 6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGroove Profile\u003c\/th\u003e\n\u003ctd\u003eV-groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRetention Method\u003c\/th\u003e\n\u003ctd\u003eRadial set screw (hex key drive)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural machined aluminium\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\u003eQuantity per Order\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 outer diameter for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe outer diameter determines your drive ratio when paired with a motor pulley. A larger driven pulley relative to the drive pulley reduces output speed and increases torque. For 1:1 drives (e.g., idler or direct-drive setups), match the OD to your existing pulley. For speed reduction, divide the driven OD by the drive OD to get the ratio. Select from 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 80 mm, or 100 mm to suit your geometry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I select the correct bore size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure your shaft diameter with a calliper before ordering. The bore must match the shaft diameter closely — a loose bore will cause runout even with the set screw tightened. Available bores range from 5 mm to 25 mm depending on the OD selected. Check the variant dropdown for bore options available for your chosen OD.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill the set screw hold under high belt tension?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe radial set screw provides firm clamping for typical belt-drive loads encountered in CNC routing, 3D printing, and light conveyor applications. For shafts with a flat (D-cut), align the set screw to the flat for maximum retention. For round shafts, ensure the screw is fully seated and apply thread-locking compound if vibration is a concern.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this pulley compatible with timing belts or only V-belts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThis pulley features a smooth V-groove profile designed for V-belts and round belts up to 6 mm wide. It is not toothed and is not compatible with GT2, HTD, or other synchronous timing belts that require a matching tooth profile. For synchronous drives, a toothed timing pulley is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow corrosion-resistant is the aluminium body?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003e6061-series aluminium has good natural oxidation resistance suitable for indoor workshop and light industrial environments. For humid or outdoor environments, consider applying a light coat of machine oil or clear lacquer to the exposed surfaces. The natural machined finish does not include anodising unless stated in the variant listing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this pulley as an idler (without a motor shaft)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The pulley can be mounted on a fixed rod or bolt acting as an idler axle, provided the bore matches the rod diameter. In idler configurations, the set screw can be left loose to allow free rotation, or tightened if the rod itself rotates. Adding a flanged bearing inside the bore is recommended for high-speed idler use to reduce friction and wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat hex key size is needed for the set screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe set screw typically uses a standard M3 or M4 hex socket drive depending on the pulley size. A 1.5 mm or 2 mm hex key (Allen key) is commonly required. If a specific size is critical for your build, contact us to confirm the set screw specification for your chosen variant before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Diameter x Bore above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"20 x 5mm \/ 1 pcs","offer_id":52444858089746,"sku":"LXDPIDAILUN225x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"20 x 6mm \/ 1 pcs","offer_id":52444858122514,"sku":"LXDPIDAILUN226x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"20 x 7mm \/ 1 pcs","offer_id":52444858155282,"sku":"LXDPIDAILUN227x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"20 x 8mm \/ 1 pcs","offer_id":52444858188050,"sku":"LXDPIDAILUN228x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"20 x 10mm \/ 1 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