Koyo Bearings FAQ: Torrington Needle Rollers, Catalogs, Sizing, and More

If you've ever typed one of these questions into a search bar and ended up on page four of Google reading a forum thread from 2011, this one's for you. I work on the quality side of industrial bearing procurement—I review every order before it reaches our production line, roughly 200+ unique items a year. In 2024 alone, I rejected about 8% of first deliveries over tolerance drift, mismarked packaging, and suspected counterfeits. These are the questions that actually show up, answered straight.

What's the difference between Koyo and Koyo Torrington needle roller bearings?

Short answer: it's the same company. Koyo acquired Torrington's needle bearing business, which is why you'll see the "Koyo Torrington" name on needle roller bearings in some markets. It's not a separate company or an older product line—it's Koyo's needle roller category, carrying the same manufacturing and QC standards.

What confuses people is the part numbering. Needle bearings like the BHA series or the TLA series follow their own logic; they don't look like ball bearing part numbers at all. So if you're cross-referencing from another brand, grab the Koyo Torrington interchange table instead of guessing.

From the outside, it looks like needle roller bearings are just smaller versions of regular bearings. The reality is they're a different tool—thin cross-section, high radial load capacity, designed for tight spaces. That's not a downgrade. Different geometry, different purpose.

Where can I find a Koyo bearings catalog?

Koyo publishes full PDF catalogs covering ball bearings, roller bearings, needle roller bearings, mounted units, and linear motion components. As of January 2025, the most direct route is searching for "KOYO bearing catalog PDF" or checking the literature section on major authorized distributor sites—many host the current edition.

The thing about catalogs: they get updated, and supersessions happen. I've seen purchase orders written against an old part number that's been replaced by a newer series. Sometimes dimensions stay identical; sometimes they don't. Verify against the latest edition before you commit part numbers to a contract or a bill of materials.

The best part of finally getting our spec process organized: no more second-guessing whether we're working from the current revision. It's a small thing until it's the difference between a working prototype and an emergency rework.

What size is an LM8LUU linear bearing?

The LM8LUU is the long version of the LM8 linear bushing. Key dimensions:

• Inner diameter: 8 mm
• Outer diameter: 15 mm
• Length: 24 mm (the "L" means long; the standard LM8 is 17 mm)

The LUU variant has a double-row ball retainer setup, which gives it a bit more load capacity than the standard open type. It's a popular size for 3D printers, CNC machines, and light automation.

Here's where the quality inspector in me kicks in: measure the shaft, not just the bearing. If your 8 mm shaft is actually 8.02 mm, you're outside the recommended clearance for an LM8LUU. I once rejected a batch of shafts that were within tolerance but consistently at the high end—the customer's linear motion ran hot and kept chewing through seals. Check shaft diameter tolerance before you assemble.

When shouldn't I choose Koyo bearings?

No brand is the right answer for every application, and anyone who says otherwise is selling something. Koyo makes consistently precise bearings—if you need standard ball bearings, spherical roller bearings, or needle rollers with reliable Japanese manufacturing, Koyo is a strong choice. I've specified them a ton of times where tolerance consistency mattered more than a few cents per unit.

That said, there are legitimate reasons to look elsewhere. Ultra-high-speed spindles might call for ceramic hybrid bearings from a specialist manufacturer. Extreme operating temperatures might push you toward niche materials. And if your purchasing policy is strictly lowest first cost, Koyo probably won't win that one—and that's not necessarily a bad trade-off if the application is truly low-stakes.

I get why people want a single "best brand" answer. But bearings are engineering components. The right question isn't "is Koyo good?"—it's "does this specific bearing fit the load, speed, and temperature profile of my application?" For roughly 80% of standard industrial applications, Koyo covers it. For the other 20%, the honest answer is to look at what's actually built for it.

Is 40 roller chain the same as #40 chain?

Yes—both refer to ANSI 40 roller chain. The number is the pitch in eighths of an inch: 40 means 4/8, which is 1/2 inch pitch. Standard roller width is 5/16 inch, pin diameter is 3/16 inch, and typical tensile strength runs around 3,700–3,900 pounds depending on the manufacturer.

What I see in the field: people pick 40 chain because it's common and affordable, then act surprised when it stretches or breaks under heavy load. If your drive is pulling anywhere near its rated limit, step up to 40-1 heavy series or move to 50 or 60 chain. The cost difference is small compared to unplanned downtime.

One more thing: ANSI pitch is standardized, but pin finish and plate thickness vary between manufacturers. Mixing chain from one brand and sprockets from another generally works... until it doesn't. For critical drives, I'd rather spec the whole drive train from one supplier.

How do I use a roller chain breaker?

A chain breaker looks simple, but there's a right way and a "why is this pin bent" way.

1. Position the chain so the tool's punch lines up with a pin in the link you want to break.
2. Make sure the chain is seated flat in the tool's anvil. A cocked chain bends pins.
3. Tighten the punch to push the pin out—but stop when it's nearly flush with the far side. Push it completely out and the link plates will spring apart. That's fine if you're splitting the chain, not if you're shortening it.
4. To reassemble, press the connector link's pin in with the tool. Hammering it in peens the pin and messes up the link clearance.

Dodged a bullet the first time I used one: I was about one full turn away from punching the pin all the way out and scattering plates across the bench. So glad I stopped and checked the travel on the tool. Small moment, saved me twenty minutes of re-threading a 60-foot chain.

How can I tell if a Koyo bearing is genuine?

This might be the most important question nobody asks upfront. Counterfeit bearings are a real problem, and they're getting harder to spot.

• Packaging: genuine Koyo boxes have crisp, consistent printing. Fakes often show blurry text or uneven spacing.
• Markings: genuine bearings have uniform, precise etching. Counterfeits frequently have shallow or inconsistent engraving.
• Feel: spin the bearing. A counterfeit typically has detectable roughness or play. Not always—some fakes are scarily good—but often.
• Source: authorized distributors exist for a reason. A marketplace listing at 40% below everyone else? There's a reason for that, too.

I rejected a batch of 8,000 units once because the packaging was subtly off—turned out they were standard-grade bearings being resold as a higher precision class. Cost the customer a production delay, but it saved them a warranty storm later. To be fair, whoever supplied those probably got fooled too. That's exactly why you verify the source chain instead of trusting a label.

On the flip side, there's something satisfying about opening a verified batch: part numbers match the order, etching is crisp, bearings spin smooth. After all the checking, seeing the inspection sheet line up with the physical parts—that's the payoff.