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Jaw Couplings High Rigidity Single Disc Carbon Steel Keyless Type (Part Numbers)

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Economy

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Product Overview

High-rigidity flexible coupling designed with a unique diaphragm fastening section.

[Features]
· Four models for shaft diameters from ⌀12 (12 mm) to ⌀60 (60 mm), with 45 standardized sizes.
· The originality of the diaphragm fastening section provides high torsional rigidity.
· Allows angular misalignment and end play.
· Low moment of inertia.

[Applications]
· Machine tools, precision platforms, etc.

Dimensional Drawing

The recommended tolerance for the applicable shaft is h7.

Eccentricity adjustment has been completed and assembly finished before shipment.

There are two threaded holes for removal on the keyless flange section. For hole sizes of ⌀20 and above for the locking bolts, threaded holes for removal are provided inside.
　When disassembling, screw in an M6 bolt.
　For installation and removal methods of the keyless type, please refer to the basic information for confirmation.

■Material specifications

Type		Diaphragm type	Body		Diaphragm	Accessories
Keyless on both sides	Keyless on one side · Keyway hole type on one side	Diaphragm type	Material	Surface treatment	Material	Accessories
E-LDBL02-D	E-LDBL56-D	Single disc type	S45C	Blackened	SUS304	Locking Bolts / Set Screws

Specification Table

Please follow the selection steps

to choose the type and parameters before placing an order. Please specify the shaft bore diameter within the range of d₁ ≤ d₂.

Type (Type·D)	—	d₁	—	d₂
E-LDBL02-D65	—	20	—	35
E-LDBL56-D65	—	18	—	22

Type		d₁ and d₂ selection (but d₁ ≤ d₂)														L	LF	S	Keyless side locking screw M1	Removal screw M2
Type	D	d₁ and d₂ selection (but d₁ ≤ d₂)														L	LF	S	Keyless side locking screw M1	Removal screw M2
E-LDBL02-D Keyless on both sides	65	14	15	16	17	18	19	20	22	24	25	28	30	32	35	68.6	25.8	5.7	M6	M6
E-LDBL02-D Keyless on both sides	87			16	17	18	19	20	22	24	25	28	30	32	35	77	28.25	8.5	M6	M6

Type		d₁ and d₂ selection (but d₁ ≤ d₂)														L	⌀N1	⌀N	LF1	LF2	S	Keyway side fixing screw M	Keyless side locking screw M1	Removal screw M2
Type	D	d₁ and d₂ selection (but d₁ ≤ d₂)														L	⌀N1	⌀N	LF1	LF2	S	Keyway side fixing screw M	Keyless side locking screw M1	Removal screw M2
E-LDBL56-D Single keyless side · Single keyway hole side	65	14	15	16	17	18	19	20	22	24	25	28	30	32	35	63	46	58	25.8	24.9	5.7	M6	M6	M6
E-LDBL56-D Single keyless side · Single keyway hole side	87			16	17	18	19	20	22	24	25	28	30	32	35	72	56	74	28.25	29	8.5	M8	M6	M6

■ Characteristic values

Type		Permissible torque (N⋅m)	Permissible angular misalignment (°)	Permissible axial deviation (mm)	Permissible speed (RPM)	Static torsional stiffness (N.m/rad)	Moment of inertia (N.m)	Fastening screw		Weight (g)
Type	D							M	Locking torque N.m
E-LDBL02-D Keyless on both sides	65	210	0.5	±0.5	7000	75000	3.6 × 10^-4	M6	13	1000
	87	390			6000	110000	1.2 × 10^-3			1230

Type		Permissible torque (N⋅m)	Permissible angular misalignment (°)	Permissible axial deviation (mm)	Permissible speed (RPM)	Static torsional stiffness (N.m/rad)	Moment of inertia (N.m)	Fastening screw		Weight (g)
Type	D							M	Locking torque N.m
E-LDBL56-D Single keyless side · Single keyway hole side	65	210	0.5	±0.5	7000	75000	3.0 × 10^-4	M6	13	920
	87	390			6000	110000	1.0 × 10^-3			1120

The values for static torsional stiffness constant, moment of inertia, and weight are based on the maximum shaft diameter.

Eccentricity is not allowed for single diaphragm type.

Shaft bore diameter d1 · d2	b (keyway width)		t Keyway depth	Key nominal size b x h
Shaft bore diameter d1 · d2	LK	RK	t Keyway depth	Key nominal size b x h
8 to 10	3	3	1.4	3 × 3
11 to 12	4	4	1.8	4 × 4
13 to 17	5	5	2.3	5 × 5
18 to 22	6	6	2.8	6 × 6
23 to 30	8	8	3.3	8 × 7
31 to 38	10	10	3.3	10 × 8
39 to 44	12	12	3.3	12 × 8
45 to 50	14	14	3.8	14 × 9

Product Features

The keyless type supports a maximum applicable torque of up to 250 N⋅m.

Product Installation

● Installation
(1) Please wipe off any dirt from the surface of the shaft and apply a thin layer of lubricating oil or grease.
　　 (Do not use lubricating oil or grease containing molybdenum-based friction modifiers.)
　(2) Similarly, clean the contact surface of the inner diameter of the coupling and apply machine oil or grease. At the same time, apply lubricant to the threaded surface and the head contact surface of the locking bolts.
　(3) Mount the coupling onto the shaft.
　　 (Do not tighten the keyless flange with bolts if the shaft has not passed through.)
　(4) After positioning is complete, first use a torque wrench to gently tighten the locking bolts in a diagonal sequence (to about 1/4 of the specified tightening torque).
　(5) Then, increase the tightening torque (to about 1/2 of the specified tightening torque) and tighten again.
　(6) Tighten using the specified tightening torque.
　(7) Finally, tighten each locking bolt one by one in a circumferential order.

● Installation precautions
· Tighten the locking bolts after the coupling is mounted onto the shaft end.
　 (If the bolts are tightened before insertion, the bushing will become deformed.)
　· Please use a torque wrench to tighten the bolts.
　· Be sure to use the supplied bolts for the locking bolts.

● Removal
　· Please perform this work only when the equipment is completely stopped.
　· Loosen the locking bolts one by one in a circumferential order.
　· Insert the bolts into the removal threaded holes and tighten them evenly.
　· When reinstalling, repeat the steps in the "Installation" section.

Precautions

■ Calibration and Adjustment

The tolerances for d1 and d2 are those before slotting.

Eccentricity adjustment has been completed and assembly finished before shipment.

The locking bolt hole of the keyless flange is equipped with a threaded hole for removal. When disassembling, please screw in an M8 bolt.
For installation and removal methods of the keyless type, please refer to

P.815 for confirmation.

The static torsional stiffness constant, moment of inertia, and weight are values for the maximum shaft diameter.

Eccentricity, angular deviation, and axial amplitude are all individual allowable values. If multiple types of deviations occur at the same time, the allowable value for each deviation is reduced to half of the original value.

For selection criteria and calibration adjustment, please refer to

P.788·789.

Example of Use

Part Number

CAD Data download and 3D preview are not available because the part number has not yet been determined.

*In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.

CAD Download

: 30; 60; 90

Part Number
E-LDBL02-D65-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]
E-LDBL02-D87-[16,17,18,19,20,22,24,25,30,35]-[16,17,18,19,20,22,24,25,30,35]
E-LDBL56-D65-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]-[14,15,16,17,18,19,20,22,24,25,28,30,32,35]
E-LDBL56-D87-[16,17,18,19,20,22,24,25,30,35]-[16,17,18,19,20,22,24,25,30,35]

Standard Unit Price	Minimum order quantity	Days to Ship	Shaft Bore Dia.1 d1 (or d) (Ø)	Shaft Bore Dia. 2 d2 (or d) (Ø)	O.D. (Ø)	Max. Rotational Speed (r/min)	Moment of Inertia (kg・m2)
-	1 Piece(s)	14 Day(s)	14 ～ 35	14 ～ 35	65	7000	3.6 × 10^-4
-	1 Piece(s)	14 Day(s)	16 ～ 35	16 ～ 35	87	6000	1.2×10^-3
-	1 Piece(s)	14 Day(s)	14 ～ 35	14 ～ 35	65	7000	7.3 × 10^-4
-	1 Piece(s)	14 Day(s)	16 ～ 35	16 ～ 35	87	6000	1.0 × 10^-3

Basic Information

Series Name	Disc	Application	For Servo Motors / Stepping Motor	Features	High Torsional Rigidity / High Torque Type
Allowable Misalignment	Angular Misalignment / Eccentricity / Axial Misalignment	Max. Rotational Speed Range(r/min)	4001~10000	Body Material	Steel
Allowable Angular Misalignment(deg)	0.5	Product Category	Coupling Main Body	Allowable Lateral Misalignment Range(mm)	0.02~0.2
Disc Material	Stainless Steel	Allowable Axial Misalignment(mm)	±0.5	Single/Double	Single

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4 Part Numbers

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Specification/Dimensions

Shaft Bore Dia.1 d1 (or d)(Ø)
14

15

16

17

18

19

20

22

24

25

28

30

32

35
Clear
Shaft Bore Dia. 2 d2 (or d)(Ø)
14

15

16

17

18

19

20

22

24

25

28

30

32

35
Clear
O.D.(Ø)
65

87
Clear
Max. Rotational Speed(r/min)
6000

7000
Clear
type
- E-LDBL02
- E-LDBL56
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

14 Day(s) or Less
Clear

Specify Alterations

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 is a coupling?: Answer: A coupling is a component used to connect two different rotating bodies (such as motor shafts or ball screws) for the purpose of transmitting torque. By absorbing shaft misalignment (eccentricity, angular misalignment, axial displacement) between rotating bodies, it reduces the load during assembly and adjustment. In the event of accidental overload, the coupling will break and disconnect the rotating bodies to protect expensive power components and the overall equipment.
Question: Is there a selection guide provided for the bore sizes at both ends of the product?: Answer: d1, d2 same diameter = d1 + 0.5
d1, d2 different diameters = larger bore diameter + 0.5
· When d1 is 4 or less and d2 is 5 or more, there are 3 set screws.
· When both d1 and d2 are less than 4, there are 2 set screws.
Question: How does the product achieve suitability for eccentricity and angular misalignment in its design?: Answer: The leaf spring formed by the slit allows for eccentricity, angular misalignment, and end play.
Question: Which mechanical components is the product suitable for?: Answer: With zero backlash, it is suitable for applications requiring rotational accuracy.
Question: What are the requirements for the product's application in terms of eccentricity and angular misalignment?: Answer: Eccentricity, angular misalignment, and axial amplitude are all individual allowable values. If multiple types of deviations occur at the same time, the allowable value for each deviation is reduced to half of the original value.

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Jaw Couplings High Rigidity Single Disc Carbon Steel Keyless Type (Part Numbers)

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Shaft Bore Dia.1 d1 (or d)(Ø)

Shaft Bore Dia. 2 d2 (or d)(Ø)

O.D.(Ø)

Max. Rotational Speed(r/min)

type

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