Aluminum A Type 5-3 Step Pagoda Pulley Wheel 150mm Outer Dia for Timing V-Belt

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Aluminum A Type 5-3 Step Pagoda Pulley Wheel 150mm Outer Dia for Timing V-Belt

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Types: Aluminum 5 slots

Size（Slots OD): 55x85x105x135x150mm

Bore & Amount: 16 mm x keyway 5 mm & 1 PCS

Price:

$81.22 USD

Stock:

In stock (500 units), ready to be shipped

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A Type Step Pagoda Pulley Wheel — Multi-Speed V-Belt Drive for Lathes, Mills & DIY Machines

When a fixed-speed motor limits your machining flexibility, a step pagoda pulley is the mechanical solution that lets you dial in the exact RPM you need without touching the motor. Whether you are a hobbyist retrofitting a bench lathe, a small-shop machinist tuning a drill press, or a maker building a custom belt-drive system, these A-type step pulley wheels give you multiple speed ratios from a single drive setup.

Each pulley is precision-turned from either aluminum alloy or cast iron, depending on the variant selected. The stepped (pagoda) profile features 3 or 5 grooves sized to accept standard A-type V-belts. Outer diameter ranges from 55 mm (≈2.17 in) up to 150 mm (≈5.91 in) across the step set, with bore options from 16 mm to 28 mm, each machined with a matching keyway for positive torque transmission. No-bore blanks are also available for custom machining to your shaft size.

Typical applications include bench lathe speed-change assemblies, drill press step-pulley conversions, bandsaw variable-speed drives, and small CNC or woodworking machine belt-drive systems where an A-type step pulley wheel with keyway bore is required for reliable, slip-free power transfer.

⚙️ Compatible with standard A-type (A-section) V-belts. Verify your shaft diameter and keyway dimensions before ordering. No-bore variants require custom boring to your shaft size.

✅ Key Features of These A Type Step Pagoda Pulley Wheels

🔩 Dual Material Options
Choose aluminum alloy for lightweight, corrosion-resistant applications or cast iron for added mass, vibration damping, and higher load capacity — both machined to the same dimensional standards.

📐 3-Step & 5-Step Configurations
Select a 3-groove set (e.g., 55×80×105 mm OD) or a 5-groove set (e.g., 55×85×105×135×150 mm OD) to achieve the speed ratio range your machine requires.

🎯 Precision-Machined Keyway Bore
Bore sizes from 16 mm to 28 mm are paired with matching keyways (5 mm or 8 mm wide) for positive, slip-free shaft engagement. No-bore blanks available for custom machining.

🔄 A-Type V-Belt Groove Profile
Grooves are cut to the standard A-section V-belt profile, ensuring full contact with the belt sidewalls for efficient power transfer and reduced belt wear.

🛡️ Corrosion & Wear Resistance
Aluminum variants offer natural oxidation resistance for workshop environments. Cast iron variants provide a hardened running surface that resists groove wear under sustained belt tension.

🔧 Drop-In Replacement Compatibility
Standard A-type groove geometry and common bore sizes make these pulleys direct replacements for worn step pulleys on lathes, drill presses, and similar belt-driven machinery.

📐 Technical Specifications — Step Pagoda Pulley Wheel

Belt Type	A-type (A-section) V-belt
Step Configuration	3-step or 5-step (see variant options)
Outer Diameter Range	55 mm – 150 mm (≈2.17 in – 5.91 in) across steps
Bore Diameter	16 mm / 19 mm / 24 mm / 25 mm / 28 mm / No bore (see variant options)
Keyway Width	5 mm or 8 mm (matched to bore; see variant options)
Material	Aluminum alloy or Cast iron (see variant options)
Groove Profile	A-type V-belt standard
Surface Finish	Machined (aluminum); as-cast / machined (iron)
Quantity per Order	1 PCS
Weight	See variant options

❓ Frequently Asked Questions

How do I choose between the 3-step and 5-step pulley?

The number of steps determines how many speed ratios you can achieve with a single belt. A 3-step pulley gives you three RPM options, while a 5-step pulley gives you five. If your machine requires a wider speed range or finer increments, choose the 5-step variant. For simpler setups with limited space, the 3-step is more compact.

Which bore size should I order for my machine shaft?

Measure your motor or machine shaft diameter precisely with a caliper. Select the bore size that matches — 16 mm, 19 mm, 24 mm, 25 mm, or 28 mm. Each bored variant includes a machined keyway. If your shaft diameter does not match any listed bore, order the No-bore blank and have it custom-bored to your specification by a machine shop.

What is the difference between the aluminum and cast iron versions?

Aluminum pulleys are lighter, naturally corrosion-resistant, and easier to handle — ideal for lighter-duty or portable machines. Cast iron pulleys are heavier, which adds flywheel effect and vibration damping, making them better suited for sustained-load applications such as metal lathes or heavy drill presses where smooth, stable rotation matters.

Will this pulley fit a standard A-type V-belt?

Yes. All groove profiles on these step pulleys are machined to the standard A-section V-belt geometry. They are compatible with any A-type V-belt of the appropriate length. Do not use B-type or other section belts, as the groove angle and depth differ and will cause premature wear or slippage.

Can I use this pulley without a keyway (no-bore option)?

The No-bore variant ships as a blank hub with no bore or keyway machined. You will need to have it bored and keyway-cut to your exact shaft dimensions by a lathe or machining service. This option is ideal when your shaft size falls outside the standard bore options or when you need a custom fit for a non-standard application.

How do I confirm the correct outer diameter set for my drive ratio?

Drive ratio is determined by the ratio of the driver pulley OD to the driven pulley OD. For example, pairing a 55 mm step on the motor with a 105 mm step on the machine gives approximately a 1:1.9 reduction. List your required input and output RPMs, divide to get the ratio, then select the step pair that matches. The variant listing shows the full OD set for each option (e.g., 55×80×105 mm or 55×85×105×135×150 mm).

Is the keyway included, or do I need to cut it separately?

All bored variants (16 mm, 19 mm, 24 mm, 25 mm, 28 mm) come with the keyway already machined at the factory. You simply need a matching key stock of the correct width (5 mm or 8 mm as specified in the variant name) to complete the shaft-to-pulley connection. No additional machining is required for bored variants.

🛒 Select your Type, Size, and Bore & Amount above, then add to cart.