Set-screw holes are machined in the quantity and size shown in the catalog, and the set screws are supplied with the product. For details, please request a product catalog or use the model index search to find the product and confirm the specifications.

The allowable torque does not change if the coupling is used with proper attention to the shaft mounting position, even when a keyway is present.

It depends on the coupling type and spline type. Please contact us using the contact form.

Although it depends on the coupling type, as a rule the shaft should be inserted across the full length of the hub (flange). If the shaft insertion length is extremely short, reduced holding force may cause slipping, prevent proper fastening, or deform the hub so that later insertion becomes impossible.

As a special measure, two set screws can be used in one threaded hole, for example. The best method depends on the bore diameter and machine specifications, so please contact us for review.

This is possible, but it is handled as a special specification.
Please use the contact form and provide the details.

Please refer to the document below.
Reference Case Studies

Depending on production conditions, products may be manufactured either manually or by machine.
When production is performed manually, paint is used as a visual check to confirm that there are no problems with torque-wrench tightening.

As a rule, insert each mating shaft so that it contacts the shaft across the full length of the coupling clamp hub (LF dimension).

A round mating shaft is the standard requirement. If a non-round shaft must be used, pay close attention to the shaft mounting position as shown below.
Depending on the shaft mounting position, the coupling body may be damaged or shaft holding force may decrease.
To obtain full coupling performance, we recommend using a round shaft.

Yes. Specify the bore diameter and fastening type for each hub.

Yes. Specify the bore diameter, fastening type, balance grade, and rotational speed for each hub.

This can be reviewed depending on the bore diameter and keyway dimensions (width, height, and tolerance). Some specifications may not be possible.

A review is required each time depending on the keyway specifications, such as geometric tolerance and position. Please describe the desired specifications and contact us using the contact form.

Depending on the SFH size, one unit may not fit in a single package. In such cases, it may be shipped in two packages, but this is not an overdelivery of units.

In theory, even single-element SFC and SFF types cannot tolerate eccentricity. However, because SFC and SFF are shipped assembled, unlike SFS and SFH which are shipped as parts, shaft-center adjustment can be difficult. Therefore, allowable eccentricity (error) is provided within a range that does not affect performance.

We conduct torsional durability testing under loads above the allowable torque. SERVOFLEX has passed 10 million cycles in this test, which is the metal fatigue limit. Because it is made entirely of metal materials, age-related deterioration is extremely low, enabling high-precision torque transmission over a long period.

Driven-shaft runout caused by a coupling is mainly due to shaft reaction force from insufficient alignment. All SERVOFLEX series metal disc spring couplings are assembled using high-precision dedicated jigs, giving the left and right bores high concentricity. Because shaft reaction force is extremely small, driven-shaft runout can be kept to a minimum.

For servo motors, noise and vibration can be suppressed by setting the mechanical resonance suppression filter in the control system to the relevant natural frequency. For stepping motors, vibration can be absorbed or suppressed by shifting the operating speed or using a STEP-FLEX coupling with high damping performance.

Our torque transmission testing uses a sufficient safety factor, so at the allowable torque listed in the catalog, the fastening section will not slip because of the fastening method. Keyway machining on clamp hubs is available; customers who require this should refer to the keyway machining option.

No. A center hole like the one shown below is machined instead.

The model is EL. For details, see ALS element only.

When power transmission is the primary purpose, a service life of 10 years or more can be expected if the product is selected properly according to the selection procedure in the catalog. Service life varies depending on the operating environment and conditions, especially operating temperature and mounting error. Please contact us for details.

Use above the normal operating torque is acceptable up to 10 times per day with 8 hours of operation per day, provided the maximum torque is not exceeded. This assumes starting torque for motors with infrequent starts and stops.

This is an element whose torque transmission surface has a convex, crowned shape, allowing greater permissible mounting error. The fit with the hub is also looser, making assembly easier and reducing work time.

STARFLEX achieves zero backlash by applying pre-compression to the element, so zero backlash may no longer be maintained as the resin ages. If long-term zero-backlash use is required, we recommend using a larger correction factor based on the nature of the load. For longer-term high-precision control, we recommend the SERVOFLEX series metal disc spring coupling.

A case-by-case review is required depending on the solvent type. Please specify the solvent you plan to use and contact us using the contact form.

It is possible to shorten the hub. Please consult us each time regarding the desired specifications. Lengthening the hub is not supported. We can propose the most suitable coupling for your application using another coupling such as SFC, so please contact us using the contact form.

When a diesel engine is used as the drive source, resonance occurs when the natural torsional frequency of the entire torque transmission system matches the frequency generated by engine speed. Engine couplings do more than transmit rotation and absorb vibration; they also help move the resonant speed away from the operating range. If a resonant speed exists, changing the torsional spring constant of the coupling, such as by changing the coupling or rubber hardness, can shift the resonant speed away from the operating speed. In models with low torsional spring constants using natural-rubber elements, such as CF-A and CM, the resonant speed tends to appear below low idle. In models with high torsional spring constants, such as CF-H, it tends to appear above high idle speed.

Rubber has a characteristic in which service life is longer when it is used in compression rather than tension. Even in compression, service life is further improved when force is applied after the rubber has already been compressed to some extent; this initial compression is called pre-compression. The CF-A model is assembled with pre-compression applied to the rubber body. The compressed portions have long service life, and the portions that would be pulled do not enter a tensile state unless torque above a certain level is applied, resulting in long overall service life.

When natural rubber is exposed to heat, oil on the surface is lost, elasticity decreases, and the rubber hardens. The progress of hardening depends on temperature. If a CF-A used inside an engine housing is affected by heat, hardening begins at the surface of the rubber body. When torque is applied to that area, cracks start from the hardened layer and damage progresses. As a maintenance guideline, we recommend replacement when rubber hardness has increased by about 15 Hs compared with the unused condition.

When mounting the hub on the shaft, the Center Lock mechanism can be used. Tightening the clamping screw deforms the spline section of the clamping hub and presses it against the spline section of the shaft, fully fixing the hub and spline shaft together. Depending on the size, tightening the clamping screw to the specified torque generates approximately one ton of axial holding force per clamping screw. Therefore, in normal use, the fastening level is fully adequate.

Replacement is recommended because the bolts have a microcapsule coating for loosening prevention.

Retightening or reassembly over a short period is possible, but the loosening-prevention effect will decrease. If the bolts have been used for a certain period, replacement is recommended.

To improve durability, the CF-A model has a structure in which pre-compression is applied. As a result, assembly may be somewhat difficult.

Yes, this is normal. The 140 and 140-H elements have a slit.

If resonance occurs, internal heat generation may cause melting damage, and the product may fail within a few minutes.

When specifying bore diameters, check the "Ordering Information" section of our catalog and list the cylindrical hub bore diameter (d1) followed by the flange hub bore diameter (d2) after the model number.
Note that the minimum and maximum bore diameters differ between the cylindrical hub side and the flange hub side.
The minimum and maximum bore diameters for each side are listed in the dimensions section, so please check that information.
Please carefully check the notes for each item.
 

The clamping hub and shaft are completely fixed by the Center Lock action, so there is no backlash.
However, if the clamping screw tightening torque is lower than the specified torque, sufficient holding force may not be obtained and backlash may occur.
Use a torque wrench or similar tool to tighten to the specified torque. Also note that for products that have backlash by design, the backlash will not be eliminated.

Only this size is originally supplied with one cut. This makes it easier to replace the element while keeping the hub fixed.

No, they cannot be used.

This depends on the ETP size and the dimensions of the hub to be mounted, but use at around 3,000 min-1 is generally acceptable. Please contact us for high-speed applications.

When the allowable torque is applied cyclically to an ETP Bushing, fatigue life is approximately 500,000 cycles. When 75% of the allowable torque is applied cyclically, fatigue life is virtually permanent.

It varies depending on the material and the shape of the mating hub.
There is no single answer. When selecting an ETP product, always follow the specified tolerances.
The specified mounting tolerances for each ETP product are provided in the selection data.
At the end of each model page, there is a page titled "Design Checkpoints." You can confirm the specified mounting tolerances there.

It varies by model.
Some models use high-safety food machinery lubricant (NSF H1 registered) instead of oil (ETP-E-R model).

It varies by model. Please contact us using the contact form.
Some stainless steel models use high-safety food machinery lubricant (NSF H1 registered) instead of oil (ETP-E-R model).

It can be used if the machined keyway is completely filled with metal epoxy putty or similar material and then shaped properly. If used with the keyway left as-is, the sleeve may deform and become impossible to remove.

Select a short-sleeve specification, or contact us, so that the shaft and hub cover the full sleeve length. In areas where the sleeve is not in contact with the shaft or hub, sleeve deformation is not restrained. This can increase deformation, cause plastic deformation of the sleeve, or prevent sufficient friction force from being obtained, resulting in failure to meet the specified values.

The listed allowable torque and allowable thrust force are the maximum allowable values when each acts independently. When torque and thrust force act at the same time, calculate the combined load and confirm that it is below the allowable torque.

Reuse is possible after minor slipping, depending on the degree of slip. Before reuse, check that the surfaces of the ETP Bushing, shaft, and hub are not scratched and that the ETP Bushing body is not deformed. The cause of the slip must also be removed before reuse.

We do not sell or replace the pressure screw. If the pressure screw is removed, air will enter the hydraulic mechanism and the locking function will be lost, so please do not replace it yourself.

This depends on the shaft diameter being used, so it cannot be said that the allowable torque is always lower. ETP products fasten by contact over the mating surface. Therefore, as shaft diameter increases, the allowable torque of ETP products becomes higher. Please see the ETP product specifications for details.

It does not conform to an IP rating. It is a stainless-steel specification designed to resist rust, so please do not use it primarily for waterproofing purposes.

The model numbers have been changed to PSL-K, PSL-G, and PSL-D. For PSL, please see the PSL product page.

Electroless nickel plating provides better corrosion resistance than the standard specification, but the rust-prevention effect varies depending on the operating environment. For use in special environments, please contact us using the contact form.

At present, dust covers are available only for the BXW model.

In addition to work volume, service life is affected by electromagnetic coil life due to thermal deterioration and by mechanical life such as springs. Electromagnetic coil life corresponds to allowable energization time. Mechanical life is the number of no-load ON/OFF operations of the clutch or brake product. For details, please use the contact form.

This can be handled as a special specification. For details, please use the contact form.

Some brakes can control torque by changing the current, but we do not handle such products.

This varies by model. The lever is not designed for continuous operation, and excessive operation may cause deformation or other issues. As a guideline, we recommend limiting operation to several dozen times.

No.

Various customizations are possible, such as using an over-excitation power supply, using inrush current at motor startup, or changing the friction material. These can increase torque, improve response, extend total work capacity (service life), and reduce heat generation. Please contact us for details.

Yes. We have many examples, such as reducing thickness while maintaining torque. Depending on the conditions, it may be possible to reduce thickness to about half that of a standard product at the same torque. Please contact us for details.

Noise from spring-applied brakes includes 1) rattling caused by slight vibration during rotation, 2) armature attraction and release noise, 3) friction noise during braking (squeal), and 4) rubbing noise during drive rotation when the brake is released. Countermeasures are available for each. The figure below shows one example.

The power supply can be fixed in place, for example by mounting it to a wall with brackets. These grooves are provided for attaching the brackets needed for that mounting.

It varies depending on the load, but the rated current is as follows.
BES-20-□□-1 1.6 A
BES-40-□□-1 3.2 A
BES-20-□□ 0.8 A
BES-40-□□ 1.6 A

BEH is an ultra-high-speed control power supply designed for high-speed, high-response control of excitation-type clutches and brakes. Spring-applied brakes are applied by springs, so they cannot be controlled electrically at high speed or with high response. For that reason, BEH is not recommended as a power supply for spring-applied brakes.

If possible, run the motor, turn the speed-change handle counterclockwise, and stop it at the maximum speed setting. Then turn the speed-change handle clockwise; the belt will loosen and can be removed. (Video)

Set the motor-side pulley to the minimum speed. Place the belt on the motor-side pulley. Hook the belt onto the driven-side pulley and rotate it half a turn to install the belt. (Video)

The adapter is tightened and fixed with the hex socket head bolt in the center of the pulley. Loosen that bolt to remove the pulley.

As a rule, we do not offer this.

The value is the current for the motor alone. A label showing the current value is attached to the side of the motor, so please refer to that label.

No, we do not offer this.

No, we do not offer this.

Spring replacement requires disassembly, so customers should not replace the spring themselves.

Please refer to the information below.

Yes, they are included.

Yes, they are included.

You can download it from the Export Control Classification Certificate Issuance page.

Please use the contact form and include the product name and model number. Because these are not standard items, confirmation takes time; even if the request is accepted, the lead time may be two weeks or longer.

For externally manufactured products, the request must be made to the manufacturer, so it takes about one month. If you are in a hurry, please contact the manufacturer directly to check whether the document can be issued from the manufacturer website or by other means.
For our products, the response will be the same as the export control classification result shown on the website. Responses from manufacturers will be submitted as received.

Classification information for parts such as elements, rubber bodies, and speed-change belts, as well as optional products such as ROSTA, clamps, brackets, and idlers, can be obtained from the website. Please note that the Export Control Classification Certificates on the website do not cover all parts and optional products.

Products may be discontinued or replaced due to performance improvements or replacement by new products. Some Export Control Classification Certificates also list old model numbers, so please check the certificate.

This is the date on which a legal revision related to export control classification came into force. At Miki Pulley, classification is checked each time notice is received that the latest legal revision will take effect. Depending on the content of the revision, however, the enforcement date may not be listed. We do not accept requests to change or delete the enforcement date.

Goods listed in Appended Table 2 include diamonds, blood products, nuclear source materials and nuclear fuel materials, agricultural chemicals, and pharmaceuticals. These are unrelated to products handled by Miki Pulley, so we do not provide classification under Appended Table 2.

We do not issue them.

In principle, an Export Control Classification Certificate is a document prepared by the customer. Preparing it in a specified format or adding information would mean that we are acting on the customer behalf, which could create liability issues due to errors and inconvenience the customer. Therefore, we do not accept such requests.

Customer-specific information such as drawing numbers and part numbers is not managed by us. It also does not need to be added to the Export Control Classification Certificate. Because errors could occur, we do not accept such requests.

Specifications that do not affect identification of the product itself are shown simply as an asterisk (*). Examples include bore diameter combinations, differences in shaft fastening methods, and special numbers assigned according to customer requirements. Therefore, even if the model number contains an asterisk, it has no effect on the export control classification result. For that reason, we do not accept requests to show the full model number on the certificate. Customers may enter the full model number on the certificate themselves if necessary.

Please use the contact form and enter the model number subject to the REACH survey request. Submitting the request through the website is faster than requesting it by phone.

For small-quantity orders, please use the Miki Pulley official online shop. For large-quantity orders, please use the contact form. If you would like to purchase through another distributor but do not know which distributor to contact, please use the contact form.

CAD page and instruction manual page are available for download.
The CAD format provided is as follows.
3D CAD: STEP format
For formats other than the above, please consult us using the contact form.
Note: For 3D CAD, we can consider preparing IGES, binary, or Parasolid formats.

We sell directly through the Miki Pulley official online shop or through our sales staff. We can suggest the best purchasing method for your needs, so if you are considering purchasing a product, please contact us using the contact form.

Normally, Seino Transportation and Fukuyama Transporting can be used.

We do not handle these products.

As a rule, this is not possible.