NTN Store & Website FAQ: Uniball vs Ball Joint, Fake Parts, and What a Quality Inspector Would Actually Check

If you typed ntn into a search engine and landed here, you probably have one of two questions: Where do I buy the real part? Or, What's the difference between a uniball and a ball joint? I'm a quality manager at NTN. I review roughly 200 part numbers a year, and I've rejected my share of first articles. This FAQ is based on the questions customers ask before they click buy—and a few mistakes I've caught that cost someone extra money.

Here's what we'll answer:

• Is the NTN website the best place to buy parts?
• Uniball vs ball joint: what's actually different?
• Can you swap a uniball for a factory ball joint?
• Why does a refrigerator thermostat keep showing up?
• How do you spot a fake part on an online store?
• Should you buy the cheapest ball joint?
• What should I check before ordering from an NTN store online?

1. Is the NTN website the best place to buy parts?

Bottom line: it depends on what you mean by buy. The NTN website is a reliable place to confirm specs, part numbers, and authorized distributors. But NTN doesn't always sell direct to consumers. A lot of genuine parts move through authorized distributors that run their own NTN store online.

Just typing ntn into Google is not a sourcing strategy. A customer once sent us photos of a bearing they bought from a site that looked official. It came in a plain box, no lot codes, no branded packaging. Per FTC guidelines, claims like official distributor need to be substantiated. If you can't verify it on the NTN website, that's a red flag.

2. Uniball vs ball joint: what's actually different?

The short answer: a ball joint is a sealed socket with a tapered stud, the kind used on control arms and tie rods. A uniball is a spherical plain bearing—a polished ball inside a housing—often used in rod ends and custom suspension links. Both allow pivoting, but they're designed for different lives.

Put another way, ball joints are engineered for automotive road conditions. They're sealed, greased, and tested for high cycle loads. Uniballs allow more misalignment and are popular in race and off-road builds, but they usually transmit more noise and vibration. If you're replacing a daily driver, a ball joint is the no-brainer. If you're building a desert racer, a uniball might make sense.

3. Can you swap a uniball for a factory ball joint?

Sometimes. But sometimes is doing a lot of work.

The mounting bore, stud diameter, and suspension geometry all have to match. A uniball might fit in the same hole but still change how the suspension articulates. From a quality perspective, I care about consistency more than cleverness. In Q1 2024, we rejected a batch of housings because the bore tolerance was off by 0.08 mm. On a suspension joint, that's enough to create play.

So no, I wouldn't swap a uniball into a factory arm without an engineering evaluation. The part that's close enough is the one that comes back as a warranty claim.

4. What does a refrigerator thermostat have to do with NTN?

Nothing. And that's exactly the point.

If your search for ntn brought up a refrigerator thermostat or a home smart thermostat market report, you're in the wrong product category. NTN, in the automotive sense, is a bearing and components company. It doesn't make refrigerator thermostats, and smart thermostats are a completely different market with different quality standards.

I'm not a thermostat expert, so if that's what you're shopping for, you should find a different resource. But if you're looking for an automotive replacement part, keep reading.

5. How do you spot a fake part on an online store?

This gets into some technical territory, but there are three checks that catch most fakes:

• Part number. It must match the NTN website datasheet exactly. A number that's close is a common counterfeit trick.
• Packaging. Genuine NTN parts have branded packaging with lot codes. If it arrives in a plastic bag with a handwritten label, that's a red flag.
• Physical details. The brand mark should be machined, not printed. Grease should be clean. Rough edges or no grease equals suspicious.

Back in 2021, I saw what happens when someone skips the part-number check on a rush order. The parts looked right, but the taper angle was off. That mistake cost them $800 in rework plus an expedited replacement. Now every incoming part is checked against the NTN store listing before it goes to inventory.

6. Should you buy the cheapest ball joint?

My honest answer: probably not, but not because cheap is automatically bad. It's about the total cost.

Let's say a genuine ball joint is $80 and a no-name one is $30. You save $50 at checkout. If the cheap one fails after 20,000 miles, you pay labor again, plus alignment, plus maybe towing. That $50 savings turns into a $500 problem. That pattern played out twice in my own projects.

The cheapest quote has cost us more in most of the projects I've managed. It's not about being premium—it's about the math. If a supplier can't show test data or a traceable part number, they're asking you to take the risk for them.

7. What should I check before ordering from an NTN store online?

Four things:

• Authorization. Is the store listed on the NTN website?
• Specs. Does the part number match the drawing or catalog?
• Return policy. If the part is wrong, who pays the restocking fee?
• Shipping. Don't let a free shipping offer override common sense. USPS raised First-Class letter postage to $0.73 in January 2025, but a ball joint is not a letter—it ships as a parcel. If the online store's shipping calculator looks off, check current USPS parcel rates on usps.com.

If the supplier can't give you a lot number or country of origin, that's not a good sign. A genuine part should be traceable. That's not overthinking it; that's quality control.