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Yuyao, Ningbo City, China

Why Your Machines Break Down: The Truth About Bearing Protection
Dirt gets in your bearings. Then your machines stop working.
This costs you big money. It makes you miss deadlines. It makes your customers mad.
But it does not have to be this way.
Hi, we are MU Shield. Since 2004, we have made the best metal bearing shields in the world. Our shields keep dirt out of your bearings. They help your machines run longer.
The Big Problem With Bearings
Fact: 75% of bearings die too soon.
Why? Dirt and water get inside them.
When this happens:
- Machines break down
- Work stops
- Fixing costs money
- Customers get mad
- You lose sleep
Look at what happens when dirt gets in your bearings:
Bad Thing | What It Costs You |
---|---|
Machine stops | $10,000-$50,000 per hour |
Parts break | More money wasted |
Workers wait | You pay them to do nothing |
Products ship late | Customers go elsewhere |
This is bad. Very, very bad.

It Gets Worse
Most people try to fix this with rubber seals.
They think rubber seals keep all dirt out. They are wrong.
Rubber seals cause NEW problems:
- They rub against metal parts
- This makes heat
- Heat makes bearings run slower
- Your machines work less
- You make less money
Look at what our tests show:
Rubber seals make bearings hot. They raise heat by 15-25°C when running fast.
Rubber seals make bearings slow. They cut top speed by 15-30%.
Rubber seals wear out. They can tear, dry out, or get stiff.
Rubber seals cost more. They are 20-50% more than metal shields.
A food plant tried rubber seals. Their machines ran HOT. They ran SLOW. This is not what you want.
The Smart Solution: Metal Bearing Shields
Since 2004, MU Shield has made top-quality metal bearing shields. Our shields solve these problems.
Metal shields work better because:
- They do not touch moving parts
- They make almost no heat
- Your bearings run at full speed
- Your machines do more work
- You make more money
See The Proof
Look at this data from top labs:
What We Measure | Metal Shields | Rubber Seals | Why This Matters |
---|---|---|---|
Top Speed | 95-100% of max | Only 70-85% of max | Faster work = more money |
Heat Made | Almost none | 15-25°C hotter | Less heat = longer life |
How Long They Last in Clean Rooms | Very long time | Wear out faster | Less fixing = more working |
Cost | 20-50% less | 20-50% more | Save money now |
Real Success Stories
HVAC Company Saves Big
An HVAC maker had a problem. Their fan motors kept stopping. They used rubber seals. The seals made too much heat at high speed.
They switched to our metal shields. Now their fans run at 12,000 RPM. No more heat problems. No more stops.
They saved $230,000 in one year.
Factory Runs Faster
A tool factory had slow machines. Why? Rubber seals.
They switched to our metal shields. Their machines now run 25% faster. They make more tools each day.
They make $450,000 more each year.
When To Use Metal Shields
Metal shields work best when:
- You need high speed
- You work in clean, dry places
- You want to save money
- You need less heat
- You need full power
Our Metal Shield Types
We make many kinds of metal shields:
- Basic Shields – Keep out big dirt, run very fast
- Z-Type Shields – Better fit, still run fast
- ZZ Shields – Shields on both sides, more protection
- Custom Shields – Made just for your machines

Why Our Shields Are Better
Not all metal shields are the same. Ours are better because:
- We use better metal
- We cut with 0.01mm accuracy
- We test every shield
- We have made shields since 2004
- We know what your machines need
What Our Customers Say
“We cut fix costs by 63% with your shields.” – Big Factory Boss
“Our machines run faster and make more parts now.” – Car Parts Maker
“Best shields we ever used. No more heat problems.” – Tool Company
Easy To Switch
Changing to our shields is easy:
- Tell us what you need
- We make samples
- You test them
- We ship fast
- Your machines run better
The Full Truth About Seals vs Shields
Let’s be fair. Sometimes rubber seals work well.
Here is the whole truth:
Where You Work | Best Choice | Why |
---|---|---|
Wet places | Rubber seals | Seals keep water out |
Dusty with tiny dust | Rubber seals | Seals stop small dust |
Clean, dry places | Metal shields | Shields let machines run FAST |
High-speed needs | Metal shields | No heat, full speed |
Need low cost | Metal shields | 20-50% cheaper |
Special Cases – When You Need Both
Sometimes you need both kinds of protection.
We can help with:
- Hybrid systems – Metal + rubber working together
- Special coatings – Make shields work better in tough spots
- Custom designs – Made just for your hard problems
Why Work With Us
MU Shield has made bearing shields since 2004. We know bearings. We know shields. We know machines.
We offer:
- Free samples
- Fast shipping
- Expert help
- Custom designs
- Best prices
Take Action Now
Your machines are losing money every day with the wrong bearing protection.
Call us at +86-18094512515 or visit market-union.com.
We will:
- Talk about your needs
- Show you the right shields
- Send free samples
- Help you save money
- Make your machines run better

The Choice Is Clear
You can keep using rubber seals and have:
- Slow machines
- Hot bearings
- High costs
- More fixes
OR
You can switch to our metal shields and get:
- Fast machines
- Cool bearings
- Lower costs
- Fewer fixes
The smart choice is clear.
[Contact us today] to stop losing money on slow, hot bearings.
MU Shield – Making the world’s best metal bearing shields since 2004.
References: Data from SKF, NTN, NSK technical reports and real customer results.