Keyless Bushings(Mechanical Lock), Straight

Overview of Keyless Bushing (Fastening Fittings)
Keyless Bushing (Fastening Fittings) is a friction connector that can easily and firmly fix the shaft and the coupling (pulley, sprocket, gear, etc.) just by tightening the bolt.
The bolt tightening force is converted via the conical surface into the surface pressure on the inner diameter side and the outer diameter side, thus fixing the coupling and the shaft.

①Applying lubricant Please wipe off the stains on the shaft surface and apply a layer of lubricant or grease.　*Do not use any lubricant or grease that contains molybdenum abrasion inhibiting agent.
②Positioning Temporarily assemble the economy series keyless bushing and the coupling, and insert the assembly into the shaft for positioning.
③Keyless Bushing (Fastening Fittings) Use a torque wrench to tighten the fastening bolts diagonally in sequence.
 Firstly tighten the bolts lightly (with 1/2 of the tightening torque), then tighten them with the specified tightening torque.
④Tightening bolts Finally tighten the bolts circumferentially in sequence with the specified tightening torque.


①Removing bolts Loosen the fastening bolts circumferentially in sequence.
②Removing economy series Keyless Bushing (Fastening Fittings) Insert the bolt into the threaded hole for removal, and screw in evenly.

①The inner Keyless Bushing (Fastening Fittings) and outer bushing (collar, side ring) of the economy series keyless bushing may vibrate slightly during transportation, and their conical surfaces may wedge against each other.
 When installing, loosen the bolts and nuts first, disassemble the body, remove the wedge on the conical surface, and then proceed with assembly.
②If the Keyless Bushing (Fastening Fittings) are tightened before installation into the wheel hole or insertion into the shaft, it will cause deformation of the economy series keyless bushing and make it unusable.
③Be sure to use accessory bolts for clamp screws.

Step ① Confirm the mounting space
Use a torque wrench when assembling the economy series Keyless Bushing (Fastening Fittings).
Please use properly after considering the assembling space.


Step ② Confirm the materials and surface treatment
Materials and surface treatment can be selected for MISUMI economy series Keyless Bushing (Fastening Fittings). It is recommended to use electroless nickel plating or stainless steel in places where there is humidity, condensation or a large amount of water.Please note that the provided material and surface treatment vary with product series.

Step ③ Confirm the allowable input load of the economy series Keyless Bushing (Fastening Fittings)
Calculate the torque and load applied on the economy series Keyless Bushing (Fastening Fittings), and confirm whether they are lower than the allowable values set for each product series.
·Input torque value of keyless bushing < Max. allowable torque of keyless bushing
·Axial load applied on the economy series keyless bushing < Allowable axial load of economy series keyless bushing
Note　When the shaft or wheel hole has keyways, it can be used if the groove width falls in the range of JIS specifications, but the allowable torque and allowable axial load will decrease by 15~20％.

Step ④ Confirm the rigidity of the shaft and wheel hole
·For the shaft, confirm the yield stress of the shaft material used, and choose a material with a yield stress higher than the wheel hole side pressure set for each product series×1.2.
·For the wheel hole, confirm the yield stress of the wheel hole material used, and choose a material with a yield stress higher than the wheel hole side pressure set for each product series×1.2.
The minimum outer diameter of the couping has been calculated for typical materials. Please refer to Minimum Wheel Hole Outer Diameter Table for each product series.