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FAQ

If your question is not answered on this page, please submit an inquiry through the "Contact Us" form.

Ordering and cancellation

Q1.
Can I cancel an order?
A1.
If you have just submitted your order, you can cancel it from the "Order History" page.
However, if your order has been accepted, if stock has been allocated, or if the order has shipped, please contact your distributor directly.
(Depending on the status of the order, cancellation may not be possible.)
Q2.
What should I do if the website isn't accepting my order?
A2.
If the site is experiencing heavy traffic, you may experience problems establishing a stable connection with our server.
If this happens, please try placing your order again later.
Please contact your distributor directly if the order is urgent.
Q3.
What should I do if I haven't received a confirmation e-mail?
A3.
Please check the e-mail address you registered to make sure it is correct.
A common mistake is mistyping the domain after the "@" symbol. Make sure any hyphens or underscores are correct. Please also check your e-mail filter settings.
Q4.
Can I order by fax?
A4.
You cannot place an order by fax.
Please submit an inquiry through the "Contact Us" page if you have any questions.
Q5.
Can I submit a repair request through this website?
A5.
Unfortunately, it is not possible to request repairs through this website.
Please contact the distributor you purchased the product from.
Q6.
Can I return product through this website?
A6.
Unfortunately, it is not possible to return product through this website.
Please contact the distributor you purchased the product from.

Registering and changing user information

Q1.
How do I change my name or address?
A1.
After you log in, you can update your information on the "Edit User Information" page under "Account."
Q2.
How do I change my password?
A2.
After you log in, you can change your password on the "Change Password" page under "Account."
Q3.
How do I change my e-mail address?
A3.
After you log in, you can change your e-mail address on the "Change E-Mail Address" page under "Account."

Product information

Q1.
Are taxes included in the product prices?
A1.
Taxes are not included in the base prices.
They are included in quotations and when you place your order.
Q2.
Where can I download CAD data?
A2.
You can download CAD data from the "2D/3D CAD" page or from the "Product Selection" page.
Q3.
What should I do if I can't find what I'm looking for?
A3.
This website is for standard or semi-custom products.
Feel free to submit an inquiry through the "Contact Us" form if you are looking for a special or custom product.

Logging in

Q1.
What should I do if I forgot my password?
A1.
You can reset your password by visiting the "Forgot Password" page.
Q2.
What should I do if I can't log on even though I've registered?
A2.
Please confirm that the e-mail you registered is correct.
If you confirm it was correct and still cannot log on, please submit an inquiry through the "Contact Us" page.

LM Guides

Q1.
What is the operating temperature range of the LM Guide and Ball Screw?
A1.
Maximum temperatures
・LM Guide (standard): 80°C
・High Temperature LM Guide (M1 Series): 150°C
・Ball Screw (standard): 80°C
Minimum temperatures
・LM Guide (standard): -15°C
・Ball Screw (standard): -15°C
Please consult with THK if you will be using a Ball Screw in a high temperature environment.
Q2.
Up to how many degrees Celsius can the C cap withstand?
A2.
It can withstand up to 80°C.
Q3.
Up to how many degrees Celsius can the AP-C treatment withstand?
A3.
The AP-C treatment can withstand up to 130°C or 140°C, and the AP-CF treatment can withstand up to 160°C or 180°C.
Q4.
How much grease does the LM Guide require?
A4.
About 30% to 60% of the space in the block should be filled with grease. This amount varies from model to model, so contact THK for more information.
Q5.
What should I bear in mind when using an LM Guide with one rail?
A5.
If the LM Guide only uses a single rail and a large moment load is applied, the load distribution will be concentrated in a localized area. This will shorten the service life, and a radial load may be applied to the ball screw, resulting in damage. For this reason, it is ideal to use two rails in parallel. However, if you have to use a single rail because of space limitations, you should use a model with a wider rail, like the Model SHW or HRW, or increase the number of blocks so that the LM Guide can withstand a large moment.
Q6.
Is it possible to attach or detach an end seal or a side seal after purchase?
A6.
For some models, the end seal and end plate are screwed down together, so removing the end seal would also remove the end plate, causing a failure. Removing the side seal would also require removal of the end plate. For this reason, neither the end seal nor the side seal can be attached or detached after purchase. Please consult with THK.
Q7.
Will there be any problems if the block is removed from the rail?
A7.
If a product has caged balls, the balls will not fall out even if the block is removed from the rail. Products that do not have caged balls come in two types: a ball-retaining type and a non-retaining type. If it is a non-retaining type, the balls will fall out when the block is removed from the rail. Stoppers and special jigs for removing blocks are available, so please contact us if you need them.
Q8.
Some LM Guides use balls, while others use rollers. What is the difference in performance (positioning accuracy, repeated positioning accuracy, rigidity, service life, etc.) between these two types?
A8.
They have almost the same performance in terms of positioning accuracy. However, Roller Guides demonstrate higher rigidity. In terms of service life, Ball Guides are often more advantageous due to the difference in their ability to absorb misalignment.
Q9.
What is the recommended greasing interval for LM Guides? Are there any guides that do not require greasing at all?
A9.
In general, the recommended greasing interval for an LM Guide without caged balls is once every 100 km travelled, but this will vary depending on the frequency of and conditions during use. LM Guides with caged balls tend to require lubrication much less frequently than other LM Guides do, and there are options such as QZ lubricating devices available that will further reduce required maintenance.
Q10.
Does the product lineup include parts such as bushings or caps for plugging the tapped holes in the LM Rail?
A10.
Each model has a dedicated C cap.
Q11.
My equipment incorporates LM Guides, and it will not be in use for a prolonged period of time. What precautions should I take?
A11.
Precautions
1. Rust
Prevent rust by using and storing the product in an environment that minimizes exposure to air.
Examples:
・Completely cover equipment with anti-rust paper.
・Coat the entire LM Guide with grease.
2. Lubricant deterioration
When lubricant is exposed to air for a long period of time, substances such as oxidants are formed and cause the lubricant to change in quality, leak, or deteriorate in other ways. Operating equipment after lubricant performance has dropped due to deterioration may lead to equipment trouble. Generally, the following phenomena occur when grease deteriorates:
・The drip temperature of grease falls, causing the oil content to separate and run off or evaporate.
・Consistency changes, sometimes causing the grease to harden.
・Performance drops due to the intrusion of dirt and dust, moisture, and other foreign material.
3. Resuming operation
・Check for rust.
・Add enough grease to discharge old grease from the block.
・When restarting equipment, start with a light operation and monitor it closely.
Q12.
Why is my newly purchased product coated in oil?
A12.
This is anti-rust oil. Wipe this oil off right before use. Note that rusting may occur if this oil is wiped off a long time before use. Contact THK for details if necessary.
Q13.
Is it possible to perform additional machining on the LM Rail or LM Block?
A13.
Additional machining is difficult because the LM Rail and LM Block have been heat-treated to increase surface hardness. Also, additional machining might result in an issue such as deformation, so accuracy cannot be guaranteed. We recommend providing instructions for additional machining when you place your order. Contact THK for more details.
Q14.
Can C caps be re-used once they have been removed?
A14.
C caps are driven into the rail mounting holes to prevent chips or foreign material from getting inside. For this reason, they cannot be used again after their initial installation. When replacing a C cap, do not use the old one again after it has been removed; use a new C cap instead.

LM Guide Actuators

Q1.
Looking at the dimensions shown in the drawing of the Model KR in the catalog, if you subtract the lengths of the nut block and the stoppers on both ends from the outer rail length, the value you get seems to be shorter than the possible stroke range. Why is this?
A1.
Each part number will yield a different result from this formula: Possible stroke range - (outer rail length) - (nut block length + stopper length at both ends). The results are 2 mm for KR2001A, 2 mm for KR2602A, 4 mm for KR33xxA, 4 mm for KR46xxA, 0 mm for KR5520A, and 0.4 mm for KR6525A. These are the dimensions of the seal lips installed at both ends of the nut block.
Q2.
How many grease nipples are installed on each KR nut block?
A2.
One is installed in each of the following places: housing A side of the KR20/26 Model A nut block, housing B side of the KR30/33/45/46 Model A and Model C nut blocks, housing B side of the KR55/65 Model A nut block, and on both sides of the KR55/65 Model B and Model D nut blocks.
Q3.
Can I install a motor not listed in the applicable intermediate flange compatibility table in the Model KR catalog?
A3.
If you notify us of the model of motor you are considering, we will investigate whether it can be installed.
Q4.
I'm using an old model that isn't listed in the General Catalog. Can I purchase the same model?
A4.
There are many models that can still be ordered even though they are not listed in the catalog. Please contact THK.

Ball Screws

Q1.
Is it possible to replace just the nut or screw shaft?
A1.
Yes, but only for Rolled Ball Screws.
Q2.
The nut came off of its screw shaft and the balls fell out. Is it possible to purchase replacement balls?
A2.
Do not purchase and insert new balls. The balls inside the Ball Screw are adjusted according to the clearance and preload. Do not attempt to repair the product, either. If the fallen balls are picked up and inserted into the screw shaft, foreign matter may enter the screw shaft, causing damage to the parts. Contact THK to request a repair.
Q3.
Can a mechanical stopper be installed on the Ball Screw?
A3.
Mechanical stoppers cannot be installed on the Ball Screw itself. Install the stopper somewhere else, such as a column. If the nut has end caps, design the product so that the end caps will not come into contact with the mechanical stopper. If they do, they could break and cause a malfunction.
Q4.
Is it alright to remove the nut to perform additional machining on the screw shaft after purchase?
A4.
Balls will fall out if the nut is removed from the shaft of the Ball Screw. To perform additional machining on the shaft after purchase, slowly remove the nut while pressing a sleeve against the end. The sleeve should be about 1 mm smaller than the minor diameter of the screw shaft. Once the nut is removed from the shaft, fasten it so that it cannot come off of the sleeve. After machining the shaft, put the nut back on the shaft in the same way that it was removed. With the sleeve pushed against the shaft end, slowly turn the nut and align the nut groove position with the shaft groove position. When the grooves are aligned, slowly turn the nut to move it back onto the shaft. If you perform additional machining without removing the nut, cover the nut completely so that metal chips do not get inside. After machining, wipe off any chips from the shaft.
Q5.
Is it possible to know when the Ball Screw was manufactured just by looking at the actual product?
A5.
The manufacturing serial number is marked on the outer circumference of the nut. If the manufacturing serial number, shaft diameter, and lead are known, then the date of manufacture and model can be identified. Contact THK if necessary.
Q6.
How should the Ball Screw be installed?
A6.
Typical installation methods are Fixed–Free, Fixed–Supported and Fixed–Fixed. The exact method of installation should be chosen based on how the Ball Screw will be used.
Q7.
What should I bear in mind when choosing a Ball Screw?
A7.
When choosing a Ball Screw, provisionally select a model and determine the critical speed and DN value from the rpm based on the conditions of use. Then calculate the service life to determine if it is satisfactory. Make sure to also investigate the life of the support bearings and change the diameter of the shaft as necessary based on the results.
Q8.
Can I purchase nuts only, and can nuts be replaced?
A8.
Nuts can only be purchased for Rolled Ball Screws. The nuts will be inserted onto a pipe serving as a temporary shaft, so line the pipe up with the Ball Screw shaft to transfer the nut to the Ball Screw. The balls will fall out if there is nothing to hold them in, so be careful when removing the temporary shaft during this process. Please refer to the THK catalog for more details.
Q9.
What kind of surface treament is used on support units?
A9.
A black oxide finish (magnetite film) is applied to S45C, which is the material for support unit housings.