Measuring a roller chain shouldn’t feel like rocket science. It’s straightforward—if you know where to look. Your machinery depends on these chains, so getting the measurements right is a big deal. It keeps everything running smoothly. Less friction. Less wear. More uptime.

Key Measurements to Get Right

Pitch
This is the space between the centers of two adjacent chain pins. Think of it as the chain’s rhythm. If the pitch doesn’t match your sprocket, the chain can slip or grind. That’s bad news for bearings and other nearby parts.
Inside Width
The inside width is the gap between the inner plates. It’s small but mighty. Too narrow or too wide, and you’ll get unwanted rubbing, noise, and eventual wear.
Roller Diameter
The roller diameter should match what your sprocket is designed for. If the rollers are off, the chain won’t ride smoothly. You’ll feel it in extra vibration and a shorter lifespan for your bearings.
Pin Diameter & Plate Thickness
These might seem like nerdy details, but they matter. They affect how strong and sturdy your chain is. Get them right, and your chain lasts longer under heavy loads.

How to Measure

Use a Caliper or Micrometer
Grab a decent measuring tool. Check the pitch by measuring from one pin center to the next. Repeat a few times along the chain to ensure consistency.
Check for Wear (a.k.a. Stretch)
Chains stretch over time. Lay it flat and measure a set number of links. Compare that length to what it was when new. If it’s longer by a certain percent (the specs will tell you how much), you know it’s time for a replacement.
Look at the Manufacturer’s Specs
Always compare your findings to the official numbers. If your chain’s dimensions match the specs, you’re golden. If not, it might be the wrong chain—or maybe it’s just worn out.

Why Bother Measuring?

Because a proper fit means smoother, quieter operation. Less grinding. Less rattling. Better efficiency. It’s like the difference between gliding on a brand-new skateboard versus stumbling on one with cracked wheels.
When the chain fits right, your bearings last longer. Your sprockets stay healthier. You spend less time hauling out the toolbox and more time running your machinery at full tilt.
Less downtime means less money wasted. Less worry. More trust in your setup. It’s a small step that leads to big payoffs—lower maintenance costs, better performance, and peace of mind.

Got Bearings? We’ve Got You Covered

At NSAR, we know that quality bearings and related parts make all the difference in the world. We’ve got offices here in the US and overseas warehouses ready to ship.
Need pillow block ball bearings, deep groove ball bearings, or spherical roller bearings? We have them. Fast shipping. Large inventories. OEM customization if you need something special.
Our goal: help keep your machines running at their best. A properly measured chain plus high-quality bearings equals a system that just works. Day after day.
The Bottom Line
Don’t overlook the details. Measure your roller chain. Make sure it fits the sprocket’s specs. Keep your bearings happy. Trust NSAR Bearings for the quality parts you need—when you need them. It’s that simple.
Buy everything you need today at Roller Chain supplier.