Echt-Flex® Coupling
NEF Key Connection
Quick turn around is available even for non-standard shaft bore diameters.
All models are RoHS compliant.
Standard
| Capacity (N·m{kgf·m}) | Bore Diameter Range (mm) |
|---|---|
| 19.6{2} to 6860{700} | φ9 to φ130 |
Features
Extensive Lineup of Finish Bore Stock Items & Quick Delivery Service
Well-stocked with finish bore items of standard shaft bore diameters. (New JIS normal type keyway)
*Quick turn around available even for non-stock shaft bore diameter items
Long Service Life
With no parts to wear, offers long usable life.
Lubrication Free
With no sliding or rotating parts, there is no need to lubricate. Also comes in the G type, which can replace gear couplings requiring lubrication.
High Torsional Stiffness
The optimally designed disk uses the finite element method to achieve high torsional stiffness and excellent flexibility.
Environmentally Resistant Type
The electroless nickel-plated type and the stainless steel type can be made upon request for applications in clean rooms or environments where the coupling comes into contact with water.
*Electric Insulation type is also available. (Spacer type)
Structure
Reference Number System
| NEF | 700 | W | – | N | H | 70 | E | D2 | X | K | H | 120 | J | D2 |
| Series | Size | Type | (1) | (2) | (3) | (4) | (5) |
(1) Kind of hub
N: Standard hub
K: Expanded hub
L: Long hub
(2) Shaft bore tolerance
H: H7 (Standard))
F: F7
J: JS7
G: G7
P: P7
M: M7
N: N7
K: K7
R: R7
(3) Bore diameter
Shaft bore diameters are in 1mm units.
(4) Keyway tolerance
J: New JIS Js9 (Standard))
P: New JIS P9
E: Old JIS E9
F: Old JIS F7
(5) Set screw positioning
*Yellow highlighted areas are expanded models.
*Due to their shape, only D0, D1, D2, D5, D6, and D8 are available as expanded hubs.
*Indicate the smaller bore diameter first
*Indicate the pilot bore (symbol “R”) first
Bore Diameter Range
Standard
| Model No. | Finish bored items with keyways (mm) | ||
|---|---|---|---|
| Standard hub: NH**JD2 | Long hub: LH**JD2 | Expanded hub: KH**JD2 | |
| NEF02 | 12, 14, 15, 16, 19, 20 | － | 25 |
| NEF04 | 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 22 | － | 24, 25, 28 |
| NEF10 | 12, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 28, 30, 32 | 15, 19, 24, 25 | 35 |
| NEF18 | 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 28, 30, 32, 35 | 25, 32 | 38 |
| NEF25 | 17, 18, 19, 20, 22, 24, 25, 28, 30, 32, 35, 38, 40, 42 | 35, 38 | 45, 48 |
| NEF45 | 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50 | 40 | － |
| NEF80 | 30, 32, 35, 38, 40, 42, 45, 48, 50, 55, 60 | 40 | － |
| NEF130 | 35, 38, 40, 42, 45, 48, 50, 55, 60, 65, 70 | － | － |
Shaft bore finishing range for each size
| Model No. | Finish bored items with keyways (mm) | |
|---|---|---|
| N: Standard hub L: Long hub |
K: Expanded hub | |
| NEF02 | φ9 to φ20 | φ21 to φ25 |
| NEF04 | φ9 to φ23 | φ24 to φ29 |
| NEF10 | φ11 to φ32 | φ33 to φ40 |
| NEF18 | φ14 to φ35 | φ36 to φ42 |
| NEF25 | φ16 to φ42 | φ43 to φ48 |
| NEF45 | φ16 to φ50 | φ51 to φ60 |
| NEF80 | φ17 to φ60 | φ61 to φ70 |
| NEF130 | φ28 to φ74 | φ75 to φ80 |
| NEF210 | φ28 to φ83 | φ84 to φ90 |
| NEF340 | φ46 to φ95 | φ96 to φ110 |
| NEF540 | φ52 to φ109 | φ110 to φ120 |
| NEF700 | φ52 to φ118 | φ119 to φ130 |
Hub Configuration
Extended-Diameter Hub
When the shaft diameter exceeds the maximum shaft bore diameter of the standard hub, regardless of there being sufficient leeway in the transmission capacity, you can select the extended-diameter hub that provides a larger boss diameter (“H”) instead of increasing the size.
Long Hub
When the key surface pressure is too high with the standard hub, the long hub can be used, which provides a longer dimension “B”, to lower the key surface pressure.
