Keyless Bushings(Mechanical Lock), Straight With Centering Function
Brand :
MISUMI
Caution
Product Description
<How to Use of Keyless Bushing (Fastening Fittings)>
① When applying lubricant, wipe off any dust on the shaft surface and apply a layer of lubricant or grease. ※Do not use lubricants or grease containing molybdenum-based antifriction agents.
②Positioning Assemble the elastic sleeve and coupling part and insert them into the shaft for positioning.
③ When tightening the bolt, use a torque wrench to tighten the locking bolt diagonally.
First tighten the bolt lightly (1/2 of the specified tightening torque) and then tighten to the specified tightening torque. ④Finally, tighten the bolts in order in the circumferential direction with the specified tightening torque.
Product Overview of Keyless Bushing (Fastening Fittings)
Overview of Keyless Bushing (Fastening Fittings)
It 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.
It 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.
Dimensional Drawing of Keyless Bushing (Fastening Fittings)
Outline Dimensional Drawing (Unit: mm)
Specifications Overview of Keyless Bushing (Fastening Fittings)
・Material Table of Keyless Bushing (Fastening Fittings)
| Type | Body | |
 Material |  Surface Treatment | |
| E-MLM | S45C | - |
Specification Table of Keyless Bushing (Fastening Fittings)
| form | D | D 1 | W | L 1 | L 2 | L 3 | fastening bolt | Weight (g) | Inner diameter tolerance μm | |||
| Type | d | M×L | Count | Tightening torque (N·m) | ||||||||
| E-MLM | 5 | 16 | 18.5 | 16 | 11.2 | 8 | 13 | M3X10 | 4 | 2.1 | 20 | +4.5 +0 |
| 8 | 21 | 23.5 | 18.5 | 12.5 | 9.5 | 14.5 | M4X12 | 5.1 | 40 | |||
| 10 | 23 | 25.5 | 19 | 13 | 15 | |||||||
| 12 | 26 | 28.5 | 22 | 15.5 | 10.5 | 18 | M4X14 | 6 | 60 | +5.5 +0 | ||
| 14 | 28 | 30.5 | 6 | |||||||||
| 15 | 29 | 31.5 | 23 | 16.5 | 11.5 | 19 | 70 | |||||
| 16 | 30 | 33 | 23.6 | 17.5 | 12 | 20 | ||||||
| 19 | 33 | 35.5 | 24 | 12.5 | 8 | 80 | +6.5 +0 | |||||
| 20 | 38 | 42 | 29 | 21 | 15.5 | 24 | M5X18 | 10 | 130 | |||
| 22 | 40 | 44 | 140 | |||||||||
| 25 | 43 | 47 | 31 | 23 | 17.5 | 26 | 170 | |||||
| 30 | 48 | 52 | 31.5 | 26.5 | 10 | 190 | ||||||
| 32 | 50 | 54 | 32.5 | 24 | 18.5 | 27.5 | 210 | +7 +0 | ||||
| 35 | 57 | 62 | 36 | 26 | 19.5 | 30 | M6X20 | 8 | 17 | 320 | ||
| 40 | 62 | 67 | 37 | 27 | 20.5 | 31 | 10 | 380 | ||||
| 42 | 64 | 69 | ||||||||||
| 45 | 67 | 72 | 37.5 | 27.5 | 21 | 31.5 | 400 | |||||
| 50 | 72 | 77 | 38.5 | 27.5 | 21.5 | 32.5 | 14 | 460 | ||||
·Material Table of Keyless Bushing (Fastening Fittings)
| Type | main body | |
| texture | Surface treatment | |
| E-MLM | S45C | - |
Product Features of Keyless Bushing (Fastening Fittings)
1. No need to machine key grooves.
No need to machine key grooves; you can use the round shaft and round hole as they are.
Reduces cutting and machining time, allowing for quick design changes.
2. Installation and removal are easy
Easily install and remove using only bolts.
No need for specialized tools, making maintenance simple. Parts can be reused, saving costs.
3. Position alignment is flexible.
Can be aligned to any position during assembly.
Can control the position during assembly, so there is no need to match the key and groove positions in the design stage.
4. No backlash.
Using a key causes backlash in the key groove, but Megalock has no gaps, making it suitable for locations with repeated forward and reverse movements.
Suitable for long-term, high-precision coaxial tightening and for locations with repeated forward and reverse movements, such as servo motors.
General Installation
This is the main use of Megalock. Installation and removal are simple, making equipment maintenance more efficient.
Position Alignment
Can control the alignment position during assembly, reducing design labor.
Load capacity
Suitable for heavy load areas as it can bear axial loads.
Others
Without backlash, the high-precision coaxial Megalock can also be used as a coupling.
Use Cases of Keyless Bushing (Fastening Fittings)
<How to Use of Keyless Bushing (Fastening Fittings)>
① When applying lubricant, wipe off any dust on the shaft surface and apply a layer of lubricant or grease. ※Do not use lubricants or grease containing molybdenum-based antifriction agents.
②Positioning Assemble the elastic sleeve and coupling part and insert them into the shaft for positioning.
③ When tightening the bolt, use a torque wrench to tighten the locking bolt diagonally.
First tighten the bolt lightly (1/2 of the specified tightening torque) and then tighten to the specified tightening torque. ④Finally, tighten the bolts in order in the circumferential direction with the specified tightening torque.
Caution of Keyless Bushing (Fastening Fittings)
① The inner bushing (main body) and outer bushing (ring, side ring) of the elastic sleeve may vibrate slightly during transportation, and the tapered parts may become wedged together.
When installing, first loosen the bolts and nuts, disassemble the main body, then loosen the wedge on the tapered surface and assemble.
② If the bolt is tightened before installing in the wheel hole or inserting into the shaft, the mechanical lock will be deformed and cannot be used.
③ Be sure to use the attached bolt for the locking bolt.
When installing, first loosen the bolts and nuts, disassemble the main body, then loosen the wedge on the tapered surface and assemble.
② If the bolt is tightened before installing in the wheel hole or inserting into the shaft, the mechanical lock will be deformed and cannot be used.
③ Be sure to use the attached bolt for the locking bolt.
How to use of Keyless Bushing (Fastening Fittings)
Step ① Check the installation space.
When assembling the mecha lock, use a torque wrench.
Please weigh the weight based on the assembly space.
Step ② Check material and surface treatment
MISUMI’s Mechalock allows you to select the material and surface treatment. Keyless Bushing (Fastening Fittings), In places with a lot of moisture, such as moisture or condensation, it is recommended to use electroless nickel plating or stainless steel. Available materials and finishes vary depending on the product range.
Step ③
Check the allowable input load of the mechanical lock Calculate the torque and load applied to the mechanical lock and check whether it is below the allowable value for each product group.
The input torque value of the elastic sleeve < the maximum allowable torque of the
elastic sleeve. The axial load applied to the elastic sleeve < the allowable axial load
width of the elastic sleeve can be used within the range of the JIS standard, but the allowable torque and allowable axial load are 15 to 20. % decrease.
Step ④ Check the rigidity of the shaft and wheel hole.
Check the yield stress of the shaft material used for the shaft, and select a material that is more than wheel hole lateral pressure × 1.2 for each series.
·Check the yield stress of the material used for the wheel hole, and select a material of more than 1.2 wheel lateral pressure for each series.
In addition, the minimum outer diameter of the coupling part was calculated using representative materials. Please refer to the minimum outer diameter table of wheel holes for each product group.
When assembling the mecha lock, use a torque wrench.
Please weigh the weight based on the assembly space.
Step ② Check material and surface treatment
MISUMI’s Mechalock allows you to select the material and surface treatment. Keyless Bushing (Fastening Fittings), In places with a lot of moisture, such as moisture or condensation, it is recommended to use electroless nickel plating or stainless steel. Available materials and finishes vary depending on the product range.
Step ③
Check the allowable input load of the mechanical lock Calculate the torque and load applied to the mechanical lock and check whether it is below the allowable value for each product group.
The input torque value of the elastic sleeve < the maximum allowable torque of the
elastic sleeve. The axial load applied to the elastic sleeve < the allowable axial load
width of the elastic sleeve can be used within the range of the JIS standard, but the allowable torque and allowable axial load are 15 to 20. % decrease.
Step ④ Check the rigidity of the shaft and wheel hole.
Check the yield stress of the shaft material used for the shaft, and select a material that is more than wheel hole lateral pressure × 1.2 for each series.
·Check the yield stress of the material used for the wheel hole, and select a material of more than 1.2 wheel lateral pressure for each series.
In addition, the minimum outer diameter of the coupling part was calculated using representative materials. Please refer to the minimum outer diameter table of wheel holes for each product group.
Related Products of Keyless Bushing (Fastening Fittings)
| timing pulley | sprocket |
 |  |
| Features of Keyless Bushing (Fastening Fittings): No keyway and other axis processing required. Since shaft processing is not required, the strength of the shaft is not reduced. Easy to find. | The position of the teeth of the characteristic keyway and the position of the key are fixed, but the position of the teeth can be freely adjusted using a keyless sprocket, making alignment easy. |
Dimensional Drawing
Unit: mm
Specification Table
| Part Number | D | D1 | W | L1 | L2 | L3 | Clamp Screw | Mass (g) | Bore Tolerance (Initial State) μ m | |||
| Type | d | M×L | Quantity | Tightening Torque (N·m) | ||||||||
| E-MLM | 5 | 16 | 18.5 | 16 | 11.2 | 8 | 13 | M3X10 | 4 | 2.1 | 20 | +4.5 +0 |
| 8 | 21 | 23.5 | 18.5 | 12.5 | 9.5 | 14.5 | M4X12 | 5.1 | 40 | |||
| 10 | 23 | 25.5 | 19 | 13 | 15 | |||||||
| 12 | 26 | 28.5 | 22 | 15.5 | 10.5 | 18 | M4X14 | 6 | 60 | +5.5 +0 | ||
| 14 | 28 | 30.5 | 6 | |||||||||
| 15 | 29 | 31.5 | 23 | 16.5 | 11.5 | 19 | 70 | |||||
| 16 | 30 | 33 | 23.6 | 17.5 | 12 | 20 | ||||||
| 19 | 33 | 35.5 | 24 | 12.5 | 8 | 80 | +6.5 +0 | |||||
| 20 | 38 | 42 | 29 | 21 | 15.5 | 24 | M5X18 | 10 | 130 | |||
| 22 | 40 | 44 | 140 | |||||||||
| 25 | 43 | 47 | 31 | 23 | 17.5 | 26 | 170 | |||||
| 30 | 48 | 52 | 31.5 | 26.5 | 10 | 190 | ||||||
| 32 | 50 | 54 | 32.5 | 24 | 18.5 | 27.5 | 210 | +7 +0 | ||||
| 35 | 57 | 62 | 36 | 26 | 19.5 | 30 | M6X20 | 8 | 17 | 320 | ||
| 40 | 62 | 67 | 37 | 27 | 20.5 | 31 | 10 | 380 | ||||
| 42 | 64 | 69 | ||||||||||
| 45 | 67 | 72 | 37.5 | 27.5 | 21 | 31.5 | 400 | |||||
| 50 | 72 | 77 | 38.5 | 27.5 | 21.5 | 32.5 | 14 | 460 | ||||
Material Specification
| Type | Body | |
 Material |  Surface Treatment | |
| E-MLM | S45C | - |
Product Features
FEATURES
Example of Use
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.
③Screwing bolts 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 Insert the bolt into the threaded hole for removal, and screw in evenly.
Precautions
①The inner bushing (body) 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 bolts 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.
Related Products
| Keyless High Torque Timing Pulleys | Keyless Sprockets |
 |  |
| Features Shaft machining of keyways, etc. is not required. As shaft machining is not required, the shaft strength will not be reduced. Easy to perform positioning. | Features The positions of teeth and keys in the keyway are fixed, but the positions of teeth can be freely adjusted by using keyless sprockets, thus facilitating the alignment. |
Usage Method
Step ① Confirm the mounting space
Use a torque wrench when assembling the economy series keyless bushing.
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. 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
Calculate the torque and load applied on the economy series keyless bushing, 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.
Use a torque wrench when assembling the economy series keyless bushing.
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. 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
Calculate the torque and load applied on the economy series keyless bushing, 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.