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Custom Pulley Parts

You don’t usually think about a pulley until the day it quits. One minute, the line runs in harmony, and then you hit a sour note with a cracked sheave or belt that won’t stay in place. One shuttered machine can throw a wrench in your production schedule. Your research into repairs leads to a bigger issue. That dependable old workhorse was built by a manufacturer that went out of business a long time ago, and the part you need isn’t found in any catalog. JK Pulley & Manufacturing has you covered. We build custom pulley parts for legacy systems that still earn their keep.

Customers come to JK Pulley for a permanent solution, not a temporary fix. Old components are often worn so that the original specs are buried under decades of use. That’s why we start with a precise measurement of your existing part. Using 3D scanning and metrology tools, our engineers evaluate fit, alignment, belt profile, and load path before we commit to a final design. On older machinery, wear often hides what the part was meant to do. We can recreate not just the shape, but the intent behind it. When it makes sense, we recommend upgrades such as using a stronger material than cast iron or making a small change to the hub geometry to reduce stress. The end result is a drop-in replacement that fits correctly and is built to last longer.

Creating custom pulley parts takes more than just a good machine and a set of drawings. It requires an understanding of power transmission, behavior of materials under stress, and how surface finish can affect vibration and belt life. Our 72,000-square-foot facility houses advanced CNC milling and turning centers that allow us to machine complex components with remarkable accuracy. For pulleys that integrate with gears, our gear hobbing capability means perfect tooth profiles that deliver efficient power transfer. We manage the entire process internally, from the first scan through final inspection. This means we maintain control over every tolerance and dimension. Your custom pulley part goes through a coordinate measuring machine (CMM) verification before shipping, so that the part we send you is exactly the part your system needs.

Not every project begins with a broken part. Sometimes our customers come to us because they want to prevent the next failure before it happens. JK Pulley teams can modernize older assemblies with better material and design that extends the service life of your existing equipment. Other clients may need our services to standardize equipment across multiple facilities, so maintenance teams can rely on consistent components. Whatever the situation, the goal is to reduce downtime and improve the performance of the equipment you already own.

JK Pulley & Manufacturing offers complete CNC machining for precision components and robotic production capabilities for when repeatability matters. Clients count on us for expert welding and fabrication for assemblies that require both strength and finish. We specialize in design and prototyping. This collaboration with engineers and maintenance teams turns ideas into feasible, cost-efficient parts. Our teams regularly consolidate multiple pieces into a single, stronger unit or simplify an assembly to reduce maintenance demands over time. Combining our knowledge of practical design and state-of-the-art technology, we help customers cut costs without cutting corners.

Downtime is expensive, and it has a way of turning one small component failure into a big gap in your bottom line. If you have a pulley, sheave, or flywheel you can’t source anymore, don’t waste time looking for a nonexistent part. Contact the experts at JK Pulley & Manufacturing right away. We’ll analyze your needs, reverse engineer the design, machine it in-house, verify it before it ships, and deliver a replacement that’s ready to go back into service. The words “up and running” will never sound so good.

JK Pulley

3805 Bates Street
St. Louis, MO 63116-3228
Phone: 314-481-2900
Fax: 314-481-9004

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12/29/2025 - You don’t usually think about a pulley until the day it quits. One minute, the... More