Stop Losing Money on Downtime. Get the Exact Japanese Servo Reducer You Need.
Your production line stopped. The robotic arm is moving weird. The packaging machine is jamming. You need a replacement part now. You don’t have time to wait for a generic gearbox that might not fit. You need the real deal.
We have the Disassembled Japanese imported reducer CP-50A-21-J601B-SP servo motor reducer with a speed ratio of 1:21. This is not a cheap copy. It is a genuine Japanese import. We take it apart, check every gear, and make sure it works like new.
We are a cable and automation parts trader. We know industrial machines. We know you need parts that last. Let’s look at why this specific reducer is the best choice for your factory.
What Exactly is the CP-50A-21-J601B-SP?
This is a high-precision servo motor reducer. It comes from Japan. The “CP” series is famous for its accuracy. It connects your servo motor to the machine load. It changes high speed into high torque.
The model number tells you everything:
- CP-50A: This is the frame size. It fits specific NEMA or IEC servo motors.
- 21: This is the reduction ratio. It is 1:21. The motor spins 21 times for the output shaft to spin once.
- J601B: This is the mounting and shaft code. It tells us how to bolt it on.
- SP: This often means “Standard Precision” or a specific backlash class.
When you buy this, you get a gearbox that handles heavy loads without shaking. It keeps your machine accurate.
Key Technical Specs (The Numbers That Matter)
You need to know if it fits. Here is the data you need. We keep it simple.
- Product Name: CP-50A Series Servo Reducer
- Model: CP-50A-21-J601B-SP
- Ratio: 1:21 (21:1)
- Rated Torque: High torque output (Typically 35-45 Nm for this size, check exact specs with us).
- Max Torque: 2x to 3x Rated Torque (For emergency stops or jams).
- Backlash: Very low (Usually < 5 arc-min). This means zero “wobble” when you reverse direction.
- Input Shaft: Keyed shaft or Spline (Fits standard Japanese servo motors like Yaskawa, Panasonic, Mitsubishi).
- Output Shaft: Solid shaft with keyway (Model J601B spec).
- Mounting: Flange mount or Foot mount.
- Efficiency: > 90%. You don’t lose power to heat.
- Lubrication: High-quality synthetic grease (Lifetime lubrication in many cases).
- Origin: Japan (Disassembled from working machines or new take-offs).
Why Do You Need a 1:21 Ratio?
Why not 1:10 or 1:50? The 1:21 ratio is the “sweet spot” for many industrial jobs.
Scenario 1: Robotic Arms
Robots need to move fast but lift heavy things. A 1:21 ratio gives the motor enough leverage. It lets the robot lift a 10kg payload without stalling. It keeps the arm steady when it stops moving.
Scenario 2: Conveyor Belts & Packaging
If you run a packaging line, speed must be exact. If the belt jerks, the labels fall off. This reducer smooths out the power. It ensures the box moves at the exact same speed as the machine before it.
Scenario 3: CNC and Cutting Machines
When a drill hits hard material, it needs torque. The 1:21 ratio multiplies the motor’s force. It prevents the drill from slowing down too much. This keeps your cut quality high.
“Disassembled” – What Does That Mean for You?
You might see the word “Disassembled” and worry. Don’t. In the industrial parts world, this is good news.
1. It is Cheaper
Brand new Japanese reducers cost a fortune. They can cost $1,000 or more. A disassembled one costs a fraction of that. It works the same.
2. It is Tested
We don’t just sell used junk. Our team takes the reducer apart. We clean the gears. We check the bearings. We replace the seals. We put it back together. We run it on a test bench. If it makes noise, we fix it. If it leaks, we dump it.
3. It is Ready to Ship
New parts from Japan take 4 to 8 weeks to ship. That is too long for a broken machine. We have these in stock or can source them fast. We can ship by DHL or FedEx. You get it in 3 to 5 days.
Installation and Maintenance (Keep It Running)
Installing this part is easy if you know the basics. But you must be careful.
Step 1: Alignment is King
The motor shaft and the reducer input must be perfectly aligned. If they are off by even a tiny bit, the bearings will die fast. Use a dial indicator if you have one.
Step 2: Clean Shafts
Old grease and dirt cause vibration. Wipe the motor shaft and the reducer input bore clean. Use alcohol or a degreaser.
Step 3: Bolt It Tight
The mounting flange has bolts. Tighten them in a star pattern. Don’t over-tighten or you will crack the housing.
Step 4: Check the Oil
Even if it says “lifetime lubrication,” check the oil level once a month. If it is low, add the right grease. Do not mix different types of grease.
Maintenance Tip:
Listen to it. If it starts whining, the bearings are dry. If it clunks, a gear tooth is broken. Fix it before it destroys the whole machine.
Where Can You Use This Reducer?
This is a universal part. It fits many brands. You will see it on:
- Injection Molding Machines: For opening and closing the mold.
- Food Processing: Washdown duty motors need good seals. This reducer resists water.
- Printing Presses: Keeps the paper tension perfect.
- Woodworking: Table saws and sanders need high torque at low speed.
- Textile Machines: Spinning and weaving require smooth motion.
If your machine uses a Panasonic, Yaskawa (Sigma), or Mitsubishi servo motor, this CP-50A reducer is likely a direct fit or needs a simple adapter plate.
Why Buy From Us?
We are not just a website. We are a real trading company. We understand cables and automation.
- We Speak Your Language: Our English support team knows technical terms. We don’t use confusing slang.
- Quality Control: We test every unit. We do not sell “as is” without checking.
- Warranty: We offer a warranty. If it fails in 3 months, we help you fix it or replace it.
- Global Shipping: We ship to the USA, UK, Canada, Australia, and Europe. We handle the customs paperwork.
- Price: We beat the OEM prices by 50% to 70%. Save your budget for other projects.
How to Order and Get a Quote
Do not wait for your machine to break completely. Get the spare part now.
To get the best price, tell us:
- The exact model: CP-50A-21-J601B-SP
- How many you need (1 piece or 10 pieces?)
- Your shipping city and zip code.
- Do you need the motor mounted on it, or just the reducer?
Send us an email or click the “Inquiry” button.
We will reply within 12 hours with a price and a datasheet.
Don’t let a broken gearbox stop your profit. Buy the Japanese quality you trust at a price you will love.
Inquire Now. Ship Fast. Run Your Machine.