Although the transmission torque and thrust load will be reduced to 90% of the catalog values, they can still be used. However, the EL series cannot be used on shafts with keyways, as they will become impossible to remove due to deformation of the main body.

In principle, Power-Lock cannot withstand bending moments.
If a bending moment is applied as shown in the diagram on the right, please contact us.

Because the shaft is short, uneven force is applied to the inner ring, etc., causing Power-Lock to deform, so it cannot be used.
Deformation also reduces centering accuracy.

The values listed in the catalog below are the allowable limits, and rougher machining than these is not permitted. When surface pressure is generated on the shaft and boss surface, the pressure will crush any unevenness on the surface, causing plastic deformation of the shaft and boss.
As a result, the shaft outer diameter becomes smaller and hub diameter becomes larger by the amount of surface roughness, which reduces the transmitted torque. There is also a risk of further plastic deformation over time.

In the case of a hollow shaft, the shaft material and inner diameter must be considered to determine whether the hollow shaft is strong enough to withstand the pressure on the shaft side that is generated when Power-Lock is tightened.
Details such as calculation formulas are listed in the catalog, so please request them from our website. Alternatively, please carry out sizing.

E-Book Catalog

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The minimum outer hub diameter dimensions that can withstand the surface pressure generated on the hub inner surface when the bolt is tightened with the specified tightening torque (_MA) are listed in the catalog. The surface pressure generated varies depending on the tightening torque, so considering that the error of a typical torque wrench is about ±5%, a safety factor of 10% or more should be used.

It is certain that the fluctuations will be extremely large, and the figures cannot be estimated or used.
Be sure to provide a centering guide on the boss.
If the length of the centering guide is at least half the shaft diameter (d/2), practical centering accuracy can be obtained.
Please determine the tolerance of the guide part according to the required accuracy.

The transmission torque increases, but the ratio varies depending on the series.
Also, please note that some series cannot be used in combination with other products.

Even if repeated impact loads are applied, the product can be used satisfactorily as long as the safety factor is taken into consideration and the bolt tightening torque is properly controlled.
The safety factor against impact torque is approximately 5.

Power-Lock apply uniform surface pressure to the shaft and boss over the entire circumference to achieve frictional fastening.
When a large bending moment is applied, the shaft or boss will tilt relative to Power-Lock.
This tilting can cause uneven surface pressure, resulting in high surface pressure in some areas, which can cause plastic deformation of Power-Lock, shaft, or boss, making it unusable.

The main benefits of providing a guide section are the following three points.
①The runout on the boss side can be reduced according to the clearance between the shaft and the guide.
②The boss diameter can be reduced.
3) The presence of a guide makes the actual installation process easier (it makes it easier to insert the PL).

Please consider the KE-LP series. Its Low Contact Pressure series allows for a smaller boss diameter. If this is still not enough, please contact us.

The coefficient of friction can be reduced by applying oil to both the standard lubrication-requiring type and the SUS lubrication-free type.
Types that require lubrication are designed with a low coefficient of friction, while types that do not require lubrication are designed with a high coefficient of friction. Therefore, if oil is applied to a stainless steel Power-Lock, the coefficient of friction between the shaft and boss will decrease, resulting in reduced torque.

If the boss width B is ℓ<B<2ℓ, calculate using hub geometry factor K3=1.0.
However, be sure to provide a guide section.

There is no functional problem even if it is L or larger, but the bolt head will protrude from the boss.

There is no problem with placing Power-Lock against the back of the boss in the temporary assembly state. During installation, as the bolt is tightened, the tapered ring will move, creating a gap at the back of the hole.
However, do not push Power-Lock to move it all the way in while tightening, as this will prevent the Tapered Ring from moving when removing it.

The retaining ring acts as the flange of Power-Lock and prevents the boss from moving when fastening.
By restricting boss movement, part of the bolt's generated axial force is lost as friction on the sliding surface between the outer ring and boss, so the torque is lower with a retaining ring than without one.

Yes, the ML series can be used. However, since the surface pressure generated on the hub side will be large, it is necessary to calculate the hub side pressure P'k using the following formula and check that the hub material strength and required outer hub diameter are satisfied.

It can be used if Prad/P in the allowable surface pressure table is 10% or less. The shaft side pressure and boss side pressure will vary depending on the customer's specifications (bolt size, number, tightening torque, etc.).

It cannot be used without a spacer for the following reasons.
① The inner ring is deformed.
② The tightening bolt interferes with the boss.
3) The boss mounting position is uncertain.
④ The boss moves during assembly.

If the shaft and boss are made of the same steel type as Power-Lock, there will be no problem as the shaft, Power-Lock, and boss will expand as one unit.
If the material is different, such as stainless steel or aluminum, separate consideration will be required, so please contact us.
The usable ambient temperature range is -30°C to 200°C.

It can be used if a little rust does not cause any problems. Even when used underwater, the mounting contact surface has high surface pressure, so water hardly penetrates and there is no degradation of performance.
However, it cannot be used if rust is not to be tolerated.

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Raydent coating peels off, causing the tapered surface to become rough and reducing transmission torque.We recommend that you consider electroless nickel plating specifications (KE-KP, AS-KP, AD-N-KP, TF-KP) or stainless steel specifications (KE-SS, AS-SS, RE-SS).
Please note that any additional processing or alterations made to the product by the customer will not be covered by the warranty.

E-Book Catalog

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There is no problem if you fill the oil after tightening the PL. However, if the oil or grease contains silicon-based or molybdenum-based antifriction agents or extreme pressure additives, please avoid reusing it.
If oil or grease containing these substances is reused, the coefficient of friction will drop drastically, causing damage to the tightening bolts.

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The transmission torque and thrust load shown in the catalog are values when assembled correctly with the specified tightening torque.
Tightening without using a torque wrench may cause Power-Lock to slip because the specified axial force cannot be obtained, or may cause damage to the bolts or deformation of Power-Lock itself due to excessive tightening.

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The tightening torque of the bolt and the transmission torque of Power-Lock have a proportional relationship. Therefore, if the tightening torque is reduced, the transmission torque will also be reduced accordingly, but it is not recommended to use the bolt with reduced tightening torque because it may cause the bolt to loosen.

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It must be applied to the contact surfaces of shafts and bosses, tapered rings, inner and outer rings, and other parts that come into contact with each other, as well as the seating surfaces and threaded surfaces of tightening bolts.
There is a misconception that applying oil to a tapered surface will cause slippage, but the lubrication effect is important for smooth movement of the tapered surface during assembly.
However, do not use oil or grease that contains molybdenum-based anti-friction agents.
Also, avoid oils or greases that contain extreme pressure additives, as using these can drastically reduce the coefficient of friction and cause damage to the tightening bolts.

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If assembled without applying the oil, the transmission torque may decrease by 20% or more. Also, the tightening bolts may become loose due to vibration, etc.
The transmission torque in the catalog is calculated based on the axial force when the bolts are tightened in a lubricated state. Therefore, never degrease the bolts.
However, the tightening bolts of the ML and SL series, stainless steel, and electroless nickel-plated series are coated with a special lubricant, so there is no need to apply oil or grease during assembly.

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When Power-Lock is installed properly, there is no need to worry about the tightening bolts loosening. However, if a washer that generates a reaction force, such as a spring washer, is used, the tightening force will decrease, resulting in a decrease in axial force and a decrease in transmission torque, so it cannot be used.

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Compared to other series, the AD-N series uses a smaller taper angle to ensure a large transmission torque.
For this reason, when installing or removing the bolts, tighten them little by little and work carefully.
Tightening the bolts too quickly can cause problems with the bolts, screw holes, etc., so be sure to tighten them evenly and little by little. (Tightening angle should be approximately 30 degrees per tightening.)
When removing, be sure to use all removal taps and follow the procedures in Instruction Manuals.

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Please refer to the video on our website that explains how to use the AD-N series Power-Lock.
How to use the AD-N series Power-Lock

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Please refer to the video on our website that explains the features and handling of the TF Power-Lock series.
Power-Lock TF Series Handling Instructions

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Please refer to the video on our website that explains the features and operation of the EF Power-Lock series.
How to use Power-Lock EF series

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For models other than the AD-N series, this can be done about 10 times, provided that Power-Lock is not slipping and is not deformed or damaged.
The AD-N series is structurally prone to deformation, so it can only be reused about twice. When reusing, please install it in the same way as installing a new Power-Lock. The transmission torque of Power-Lock will not change.
If the tightening bolts are coated, please replace them with new bolts depending on the situation.

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Please disassemble the product completely and check that each part is not deformed or damaged. If there is no damage, you can reassemble it according to the instructions in Instruction Manuals and reuse it.
The AD-N series cannot be disassembled, so please check the overall appearance carefully. However, please note that the number of times you can reuse it is limited to 1-2 times, as this may cause problems such as deterioration of the surface roughness.

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When a tightening bolt is properly tightened with the specified tightening torque (_MA), the friction torque is greater than the torque that would cause it to loosen naturally, so there is no need to worry about it loosening.
Furthermore, (1) the bolts are designed to be used with a high tightening force at all times to ensure a frictional force that prevents loosening. (2) The part that comes into contact with the bolt seat is heat treated to reduce the risk of the seat sinking. For these reasons, the bolts will not loosen, so you can use them without any problems.

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There is no problem in checking the tightness. If you use a torque wrench to set it to the specified torque value and check it, it will not break unless it is rusted.

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This is to prevent seizure and galling of the threads. However, please avoid using lubricants that contain extreme pressure additives or molybdenum-based antifriction agents, as they will drastically change the coefficient of friction and may cause bolt damage.

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Please specify "Tightening bolts for Power-Lock model number" and ask your dealer for a quote for the required number.

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Power-Lock "PL035X060" and "PL035X060AS" are the same, with only the model number being changed. Although the dimensions remain the same, some specifications were revised in March 2012, with changes made to the tightening torque (some sizes only), transmission torque, thrust load, shaft side pressure, and boss side pressure.

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Power-Lock "PL045X075AD" and "PL045X075AD-N" are compatible in both capacity and dimensions, but have undergone minor changes. The internal mechanism has been improved from the previous AD type, making it easier to remove. Therefore, it is possible to replace the "AD" with the "AD-N."

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