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When a misaligned cable jumps its track or a worn plastic pulley cracks mid-project, the whole mechanism grinds to a halt. Engineers, robotics builders, and workshop makers who need a reliable, dimensionally consistent pulley reach for a machined aluminum solution — one that stays true under load and resists the flex that plagues lighter alternatives.
These U-groove aluminum pulley wheels are machined from 6061-series aluminum alloy and feature a pre-installed radial bearing at the center bore. Outer diameters span 30 mm (1.18 in) to 80 mm (3.15 in); bore hole sizes range from 5 mm (0.20 in) to 15 mm (0.59 in); groove widths are available in 6 mm or 8 mm to suit different rope and cable diameters. The U-shaped groove profile keeps round-section ropes, cables, and cords seated firmly during operation.
Typical applications include DIY rope-drive linear actuators, CNC cable tensioning systems, 3D-printer filament guide pulleys, small-scale crane and hoist mechanisms, and custom belt-redirect assemblies where a compact, low-friction idler is required.
Each pulley ships with a radial ball bearing pressed into the bore, delivering smooth, low-friction rotation without additional assembly.
Five outer diameters (30 / 40 / 50 / 60 / 80 mm) combined with bore sizes from 5 to 15 mm and two groove widths (6 mm / 8 mm) give you precise fitment across a broad range of builds.
The wheel body is machined from aluminum alloy, keeping weight low while maintaining dimensional stability under the lateral and radial loads typical of rope and cable drive systems.
The symmetrical U-shaped groove seats round-section ropes and cables securely, reducing side-slip and extending the service life of both the pulley and the running line.
Aluminum's natural oxide layer provides baseline corrosion resistance suitable for indoor workshop environments and light-duty outdoor enclosures.
Standardized OD and bore dimensions make these pulleys straightforward substitutes for worn or undersized pulleys in existing frames and brackets.
| Material | Aluminum alloy (6061-series, machined) |
|---|---|
| Outer Diameter (OD) | 30 mm / 40 mm / 50 mm / 60 mm / 80 mm (see variant options) |
| Bore Hole Diameter | 5 / 6 / 7 / 8 / 10 / 12 / 15 mm (see variant options) |
| Groove Width | 6 mm or 8 mm (see variant options) |
| Groove Profile | U-groove (round-section rope/cable) |
| Bearing Type | Radial ball bearing (pre-installed) |
| Finish | Natural anodized / machined aluminum |
| Suitable Rope/Cable Diameter | Up to groove width (6 mm or 8 mm) |
| Package Contents | 1 piece per unit (multi-pack options available) |
| Weight per Unit | See variant options |
Match the OD to the space available in your bracket or frame. Larger ODs (60–80 mm) provide a gentler bend radius for the rope or cable, reducing wear on the running line. Smaller ODs (30–40 mm) suit compact builds where clearance is limited. Measure your mounting envelope first, then select the largest OD that fits comfortably.
Select the groove width that matches or slightly exceeds your rope or cable diameter. A 6 mm groove suits cords and cables up to approximately 5–6 mm in diameter; an 8 mm groove accommodates lines up to approximately 7–8 mm. Using a groove that is too narrow can cause the rope to ride on the groove edges rather than seat fully, increasing wear.
The bore must match your shaft or bolt diameter. Available sizes are 5, 6, 7, 8, 10, 12, and 15 mm. If you are using a standard metric bolt as an axle, select the bore that matches the bolt's nominal diameter. A snug fit prevents lateral wobble; if you need a looser fit for easy removal, size up by 1 mm and use a spacer or washer.
6061-series aluminum alloy offers a tensile strength of approximately 260–310 MPa and a yield strength of approximately 240–276 MPa, making it suitable for light-to-medium duty rope and cable drive applications. For heavy industrial loads or shock-load environments, consult the specific load rating of the bearing and verify that the aluminum body meets your safety factor requirements.
Aluminum's natural oxide layer provides baseline corrosion resistance adequate for dry indoor use and occasional light moisture exposure. For sustained outdoor or wet environments, consider applying a protective coating or selecting a stainless-steel alternative. The pre-installed bearing should be kept lubricated and protected from prolonged water ingress to maintain smooth operation.
Yes. The U-groove profile and radial bearing make these pulleys effective as idler or redirect wheels for round-section belts and cords in light-duty drive systems, such as 3D printer axes, small CNC machines, and custom automation rigs. Ensure the belt or cord diameter is compatible with the selected groove width before use.
The radial ball bearing is pre-installed at the factory. The pulley is ready to mount on your shaft or bolt straight out of the package — no pressing tools or additional assembly required.
