What transmission components can be combined with economy series keyless bushings?

Guide shafts and parts (pulleys, gears, sprockets), etc. can be easily installed for combined use.

Will they become loose after installation and prolonged use, and can they be used for reverse rotating mechanisms?

There will be no loosening during use as long as the bolts are tightened, so it is particularly effective for repeated forward and reverse rotation.

Can the coaxiality be guaranteed if no keys are mounted and only bushings are used in the joint area?

The coaxiality of the parts can be achieved simply by tightening the bolts to install them. There is no need for time-consuming key machining of the shaft and coupling part and the running-in process during assembly, thus reducing the total cost.

What is the tightening principle of the bushing?

It converts the tightening force for bolt connection into the surface pressure on the inner diameter side through the conical surface, and there is no need for the time-consuming key machining of the shaft and coupling part and the running-in process during assembly, thus connecting the shaft and coupling part firmly.

How many materials are available for selection?

Currently, MISUMI offers three material choices: steel, stainless steel, and aluminum alloy.

Notice of End of Sales for Economy Series Pneumatic Equipment Category. More information.

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Part Number Complete

E-MLA19

Shaft Bore Dia. d Hub Dia. D Max. Allowable Torque Range Max. Allowable Torque Overall Length Outer Dia. D1 (or D) CAD Days to Ship

Specification/Dimensions

Shaft Bore Dia. d(Ø)
19

20

22

25

30

32

35

40

50
Clear
Hub Dia. D(Ø)
47

50

55

60

65

80
Clear
Max. Allowable Torque Range(N•m)
200.1~300.0

300.1~500.0

500.1~700.0

700.1~1000.0

1000.1~3000.0
Clear
Max. Allowable Torque(N•m)
280

310

400

530

680

750

980

1870
Clear
Overall Length(mm)
26

32
Clear
Outer Dia. D1 (or D)(Ø)
47

50

55

60

65

80
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

Same day
Clear

Specify Alterations

Keyless Bushings(Mechanical Lock), Straight

Volume Discount

Check FAQ of this product (5 items)

Brand :

MiSUMi Economy

Order Qty :
Total Price :

---
Days to ship :

---

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Product Overview of Keyless Bushing (Fastening Fittings)

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.

Product Features of Keyless Bushing (Fastening Fittings)

FEATURES of Keyless Bushing (Fastening Fittings)
Product Features

Dimensional Drawing of Keyless Bushing (Fastening Fittings)

Outline Dimensional Drawing of Keyless Bushing (Fastening Fittings) (Unit: mm)

Example Use of Keyless Bushing (Fastening Fittings)

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.

Example of Use

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.

Precautions of Keyless Bushing (Fastening Fittings)

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.

Specifications Overview of Keyless Bushing (Fastening Fittings)

・Material Table of Keyless Bushing (Fastening Fittings)

Type of Keyless Bushing (Fastening Fittings)	Body
Type of Keyless Bushing (Fastening Fittings)	Material	Surface Treatment
E-MLA	S45C	-

Related Products of Keyless Bushing (Fastening Fittings)

Keyless Bushing (Fastening Fittings) High Torque Timing Pulleys	Keyless Bushing (Fastening Fittings) Sprockets

Features of Keyless Bushing (Fastening Fittings) 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 of Keyless Bushing (Fastening Fittings) 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 of Keyless Bushing (Fastening Fittings)

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.
Related Products 2

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.

Part Number

Incomplete part number.
Please use left hand selections to complete a part number.

: 30; 45; 60

Part Number
E-MLA19
E-MLA20
E-MLA22
E-MLA25
E-MLA30
E-MLA32
E-MLA35
E-MLA40
E-MLA50

Price	Minimum Order Qty.	Volume Discount	Days to Ship	Shaft Bore Dia. d (Ø)	Hub Dia. D (Ø)	Max. Allowable Torque Range (N•m)	Max. Allowable Torque (N•m)	Allowable Thrust Load (kN)	Overall Length (mm)	Outer Dia. D1 (or D) (Ø)
₹ 2,131.55	1 Piece(s)	Available	Same day	19	47	200.1~300.0	280	29	26	47
₹ 2,150.32	1 Piece(s)	Available	Same day	20	47	200.1~300.0	280	29	26	47
₹ 2,161.56	1 Piece(s)	Available	Same day	22	47	300.1~500.0	310	29	26	47
₹ 2,200.01	1 Piece(s)	Available	Same day	25	50	300.1~500.0	400	32	26	50
₹ 2,305.28	1 Piece(s)	Available	Same day	30	55	500.1~700.0	530	36	26	55
₹ 2,460.29	1 Piece(s)	Available	Same day	32	60	500.1~700.0	680	42	26	60
₹ 2,471.61	1 Piece(s)	Available	Same day	35	60	700.1~1000.0	750	43	26	60
₹ 2,649.00	1 Piece(s)	Available	Same day	40	65	700.1~1000.0	980	49	26	65
₹ 3,336.43	1 Piece(s)	Available	Same day	50	80	1000.1~3000.0	1870	75	32	80

Dimensional Drawing

Unit: mm

Dimensional Drawing

Specification Table

Part Number		D	W	L₁	B	Clamp Screw			Mass (g)	Bore Tolerance (Initial State) μ m
Type	d					M×L	Quantity	Tightening Torque (N·m)
E-MLA	19	47	26	20	17	M6X18	8	15	200	+27 +3
	20								230
	22								230
	25	50					9		240
	30	55					10		270
	32	60					12		300	+30 +3
	35								300
	40	65					14		330
	50	80	32	24	20	M8X22	12	37	580

Material Specification

Type	Body
Type	Material	Surface Treatment
E-MLA	S45C	-

Basic Information

Series	Straight Type	Centering Function	None	Tightening Structure	Double Cone Type
Structure	Mechanical Type (Wedge Type)	Locking Screw Qty.	Multiple pcs.

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently asked question (FAQ)

Question: What transmission components can be combined with economy series keyless bushings?: Answer: Guide shafts and parts (pulleys, gears, sprockets), etc. can be easily installed for combined use.
Question: Will they become loose after installation and prolonged use, and can they be used for reverse rotating mechanisms?: Answer: There will be no loosening during use as long as the bolts are tightened, so it is particularly effective for repeated forward and reverse rotation.
Question: Can the coaxiality be guaranteed if no keys are mounted and only bushings are used in the joint area?: Answer: The coaxiality of the parts can be achieved simply by tightening the bolts to install them. There is no need for time-consuming key machining of the shaft and coupling part and the running-in process during assembly, thus reducing the total cost.
Question: What is the tightening principle of the bushing?: Answer: It converts the tightening force for bolt connection into the surface pressure on the inner diameter side through the conical surface, and there is no need for the time-consuming key machining of the shaft and coupling part and the running-in process during assembly, thus connecting the shaft and coupling part firmly.
Question: How many materials are available for selection?: Answer: Currently, MISUMI offers three material choices: steel, stainless steel, and aluminum alloy.

Check other FAQ (2 items) Hide

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