Products Power Transmission Products

  • Echt-Flex® Coupling

NEF Long Spacer Type

Enables the use of a floating shaft when there is some distance between devices. Depending on the spacer length, can absorb a large amount of eccentricity.

Electric Insulation type is also available.

All models are RoHS compliant.

NEF Long Spacer Type

Standard

Capacity
(N·m{kgf·m})
Bore Diameter Range
(mm)
39.2{4} to 6860{700} φ9 to φ130

1.Features

Floating Shaft Function
Serves as a floating shaft when there is some distance between devices
Large Allowable Eccentricity
Can absorb a large amount of eccentricity depending on the spacer length
Suitable for Line Shaft Drive
Combined with miter gearboxes, fit for line shaft drives
Long Spacer Type Couplings in Stock
Long spacers with specific dimensions are always in stock and available for quick delivery. JS type is designed with balance equivalent to G6.3/1800r/min.
Capable of accommodating up to 6m of the hub face distance ("J" dimension)
long spacer image

2.Structure

Structure

3.Reference Number System

NEF 25 W - N H 35 J V D2 X N H 40 J D2 - J 1000
Series Size Type (1) (2) (3) (4) (5) (6) (7) (8)
  1. (1) Kind of hub: N = Standard hub, K = Expanded hub, L = Long hub, B = Square hub
  2. (2) Shaft bore tolerance
  3. (3) Bore diameter (Plain bore: R)
  4. (4) Keyway tolerance: J = Keyway of New JIS normal type, C = Clamp, T = Taper-Lock
  5. (5) Indicates the lower-side bore diameter of the vertical Long Spacer Type coupling
  6. (6) Set screw positioning
  7. (7) J: Long Spacer, JS: Long Spacer (standard length), JT: Single Plate Spacer
  8. (8) Dimension "J"
  • Indicate the smaller bore diameter first
  • Indicate the plain bore (symbol "R") first

Model numbers for Couplings change from November 1, 2016.

4.Torsional Stiffness Calculation for Long Spacer Type

Use the following formula to calculate. (Unit: N·m/rad) / {kgf·m/rad}

(T X 10 4 )
((J-J 1 )・K 1 +K 2 )

Model No. J 1 K 1 K 2
NEF 04W 63 0.0949 32.0
NEF 10W 64 0.0857 22.2
NEF 18W 74 0.1152 22.5
NEF 25W 89.4 0.0856 19.2
NEF 45W 105.6 0.0656 20.0
NEF 80W 119 0.0579 20.0
NEF130W 148 0.0436 17.3
NEF210W 161 0.0413 18.3
NEF340W 195.6 0.0434 20.6
NEF540W 225.6 0.0276 49.5
NEF700W 257.6 0.0286 47.1
  • J: The dimension "J" given in the external drawing (distance between hub end faces) in mm.
  • T: The rated torque given in the transmission capacity table in N·m
  • Substitute the constants given in the above table for J1, K1 and K2

5.Approx. Weight of Long Spacer Type/Moment of Inertia and GD2 Calculation Formula

Use the following formula to calculate (at maximum bore diameter)

Weight = W 1 (J-J 1 )+W 2   Unit: kg

GD 2 =W 1 ×d 1 (J-J 1 )+G 1   Unit: kgf·cm 2

Moment of Inertia = W 1 ×d 2 (J-J 1 )+G 2   Unit: kg·cm 2

J: "J" dimension (Hub end face distance)  Unit: cm

Substitute the constants given in the table below for J 1 , W 1 , W 2 , d 1 , d 2 , G 1 and G 2 .

Weight
Model No. W 1 W 2 J 1
NEF04W 0.02 1.2 6.3
NEF10W 0.03 1.5 6.4
NEF18W 0.03 2.7 7.4
NEF25W 0.04 3.5 8.9
NEF45W 0.06 6.3 10.6
NEF80W 0.09 9.6 11.9
NEF130W 0.12 15.4 14.8
NEF210W 0.16 22.5 16.1
NEF340W 0.19 29.9 19.6
NEF540W 0.36 46.1 22.6
NEF700W 0.38 69.5 25.8
Moment of Inertia, GD 2
G 1 d 1 G 2 d 2
23 8.8 6 2.19
48 15.3 12 3.83
105 18.6 26 4.65
173 28.2 43 7.05
459 41.1 115 10.28
936 56.5 234 14.13
1948 94.3 487 23.59
4006 119.2 1001 29.79
6475 159.1 1619 39.78
13185 208.4 3246 52.09
25423 241.9 6356 60.47

6.Transmission Capacity/Dimensions

Model No. Allowable Torque
N・m
plain bore
b
Max. Shaft Dia.
(Keyway)
B D D E H K N 1 N 2 N 3
NEF04W 39.2 8 23 25.4 29 6.1 34 67.5 17 27 32
NEF10W 98 10 32 25.4 37 6.6 46 81 26 36 42
NEF18W 176 12 35 28.7 39 8.3 51 93 30 40 46
NEF25W 245 15 42 33.5 45 11.2 61 104 38 50 56
NEF45W 441 15 50 41.1 51 11.7 71 126 48 60 68
NEF80W 784 15 60 47.8 61 11.7 84 143 60 70 80
NEF130W 1270 25 74 57.2 73 16.8 106 168 76 92 102
NEF210W 2060 25 83 63.5 84 17 118 194 88 103 115
NEF340W 3330 45 95 76.2 97 21.6 137 214 106 120 132
NEF540W 5290 50 109 88.9 110 23.9 156 246 125 134 154
NEF700W 6860 50 118 101.6 120 27.2 169 276 136 145.2 165.2
Model No. A J Allowable Misalignment
Angular Misalignment
(deg)
Axial Displacement Parallel Misalignment
ε
NEF04W 2B
+
J
Max
6000
2 ±1.6 (J-E)
×
tanθ
NEF10W ±2.0
NEF18W ±2.4
NEF25W ±2.8
NEF45W ±3.2
NEF80W ±3.6
NEF130W ±5.0
NEF210W ±5.4
NEF340W ±6.6
NEF540W ±7.6
NEF700W ±8.0
  • *All sizes are made-to-order. When ordering, specify dimension "J".
  • *When used at high speed, or if dimension "J" is especially long, balance adjustment or a critical speed check may be required. See the catalog.
  • *Contact us for vertical applications
  • *Refer to the following description and check the key surface pressure in accordance with your operating conditions. The hub material is S45C.

7.In-Stock Long Spacer Model List

○: JS Type (dynamic balance equivalent to G6.3/1800r/min) ●: Standard Long Spacer (welded construction)

Model No. Spacer Length, Dimension "J" (mm)
100 127 140 180 200 250 300 350 400 450 500 600 700 800 900 1000
NEF 04W
NEF 10W
NEF 18W
NEF 25W
NEF 45W
NEF 80W
NEF130W
NEF210W
NEF340W

Note: See the dimensional data for dimension "J".
The values show distance between hub end faces. The actual spacer length is J-2E.

8.Weight of JS Type Long Spacer/Moment of Inertia/GD2

The JS type is a form-turning standard long spacer with dynamic balance equivalent to G6.3 and compliant with the ISO standards.

Model No. Weight
(kg)
Moment of Inertia
(kgf·cm 2 )
GD 2
(kgf·cm 2 )
Model No. Weight
(kg)
Moment of Inertia
(kgf·cm 2 )
GD 2
(kgf·cm 2 )
NEF10W JS100 1.7 12.8 51 NEF80W JS127 10.8 201.8 807
JS140 1.9 13.5 54 JS140 11.0 203.5 814
NEF18W JS100 2.6 25.8 103 JS180 1.3 208.8 835
JS140 2.8 26.8 107 JS200 11.5 211.5 846
NEF25W JS100 3.3 42.3 169 JS250 12.0 218.3 873
JS127 3.5 43.8 175 NEF130W JS127 16.7 420.8 1683
JS140 3.6 44.3 177 JS140 16.8 424.5 1698
NEF45W JS100 6.9 97.5 390 JS180 17.3 435.8 1743
JS127 7.2 100.0 400 JS200 17.6 441.5 1766
JS140 7.3 101.0 404 JS250 18.2 455.5 1822
JS180 7.6 104.5 418 NEF210W JS140 24.0 851.5 3406
JS200 7.8 106.3 425 JS180 24.5 868.8 3475
JS250 8.2 110.8 443 JS200 24.8 877.5 3510
NEF340W JS180 42.0 1427.3 5709
JS200 42.4 1444.0 5776