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BK55 Pulley
BK55 pulleys are 5.25" in diameter and are also commonly known as BK55 sheaves. Our pulleys are manufactured in accordance with ARPM standard IP20 for safe operation and interchangeability with other brands. Additionally, we stock a complete line of premium A-series and B-series v-belts. For additional information or formal quotes please contact us and we will be happy to assist you.
Key-Way Size Chart:
| Key-Way Size | |
|---|---|
| 1/2" | None |
| 5/8" - 7/8" | 3/16" X 3/32" |
| 15/16" - 1-1/4" | 1/4" X 1/8" |
| 1-7/16" | 3/8" X 3/16" |
What is a BK55 pulley?
A BK55 pulley is a single-groove, cast-iron V-belt sheave made for B-section (and fractional-horsepower 5L) V-belts. The BK prefix indicates a light-duty B-groove sheave, and the number reflects its nominal outside diameter, so a BK55 runs at roughly a 5.5 inch outside diameter. Explore the full range of B-section V-belt pulleys for other diameters.
What size V-belt does a BK55 pulley use?
The BK55 is grooved for a single B-section V-belt, which also fits the 5L fractional-horsepower belt. It will not correctly seat an A/4L or C-section belt. Pair it with the right V-belts for smooth, slip-free power transmission.
What bore sizes does the BK55 pulley come in?
BK55 pulleys are stocked with several finished bore sizes, commonly 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, and 1 inch, with a keyway and set screws. Choose the bore that matches your motor or driven shaft diameter, and confirm the keyway before ordering.
What is the difference between an AK and a BK pulley?
The letter denotes the belt groove. AK sheaves are grooved for A-section (and 4L) belts, while BK sheaves like the BK55 are grooved for wider B-section (and 5L) belts. If your drive uses A-section belts, see our A-section pulleys instead.
What is the difference between a BK55 and a 2BK55 pulley?
A BK55 has one groove for a single V-belt, while a 2BK55 has two grooves to run two belts side by side for higher load capacity. For single, double, and multi-groove options, browse our full V-belt pulleys and sheaves range.
How do I choose the right V-belt pulley size?
Select the sheave by belt section (A, B, or C), groove count, bore, and outside diameter, then use the driving and driven diameters to set your speed ratio. Our guide to V-belt pulley design basics walks through sizing, and confirm final dimensions against the product spec.
BK55 Pulley Request Form
To get a quote on BK55 pulles/ sheaves fill out the request for quote form and someone from our customer service team will contact you.
Frequently Asked Questions
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If your order is less than $300, no problem! Please give us a call at 407-347-3519 or email Sales@usarollerchain.com, and we will be happy to assist you!
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USA Roller Chain utilizes an extensive network of vendors and warehouses to ensure you get your items quickly! Our primary roller chain warehouse is located in Clermont, FL, but we have warehouses located all across the United States. Your order will be shipped from the closest warehouse to you that has your requested product in stock. This speeds up transit times and saves you money on shipping! If you have any questions about where an item will ship from, please CONTACT US
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In-stock items are typically shipped out in 1-3 business days.Made-to-order item lead times vary from 1-2 days up to 14-20+ weeks, depending on the product. If you need your items urgently, please let us know, and we will do our best to meet your required delivery date! If you have any questions, please CONTACT US
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If you are having an issue with your order, please CONTACT US as soon as possible so we can resolve it for you.
Most in-stock items can be returned within 30 days of the shipment date. MTO or Custom orders are not eligible for a return or refund. For a detailed explanation of our return policies, please click here.
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Absolutely! We may be called "USA Roller Chain", but we ship worldwide! Please CONTACT US for Export/International quotes or orders.