CF-B Polyurethane Resin Type

三木プーリのセンタフレックスCF-Bモデル CF-Bタイプ ゴム・樹脂カップリング製品画像（ポリウレタン樹脂エレメント・防振軸継手）
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Because the elements are made of highly elastic polyurethane resin, they excel at absorbing vibrations and shocks during power transmission and also reduce noise.The CF-B model features a compact and simple design in which the element is simply sandwiched between two hubs, allowing for smooth power transmission even if there is misalignment between the two shafts.

[Specifications]

CF-B Performance Specifications
Model Torque Tolerance Maximum Rotational Speed
[min⁻¹]		 Static torsional spring constant
[N·m/rad]		 Moment of
inertia [kg·m²]		 Mass
[kg]		 Price for pre-drilled
holes [JPY]
Rated torque
[N·m]		 Maximum
[N·m]		 Eccentricity
[mm]		 Angular Deviation
[°]		 Axial
[mm]
CF-B-070 30 60 0.5 1 ±1 10,000 1.30×10³ 2.80×10⁻⁴ 0.7
CF-B-080 60 120 0.5 1 ±1 9000 1.53×10³ 3.39×10⁻⁴ 0.8
CF-B-100 120 240 0.5 1 ±1 7500 3.51×10³ 1.34×10⁻³ 2
CF-B-120 250 500 0.5 1 ±1 6000 7.90×10³ 3.34×10⁻³ 3.4
CF-B-140 400 800 0.5 1 ±1 5000 1.34×10⁴ 7.02×10⁻³ 5.4
CF-B-165 600 1200 0.5 1 ±1 4000 2.36×10⁴ 1.78×10⁻² 8.7
CF-B-185 1000 2000 0.5 1 ±1 3600 1.02×10⁵ 3.67×10⁻² 13.8

  • The maximum rotational speed does not take dynamic balance into account.
  • The values for the static torsional spring constant are given at 20°C.
  • The values for moment of inertia, mass, and price apply to cylindrical hubs with a through-hole.

[Dimensions]

三木プーリのセンタフレックスCF-Bモデル CF-Bタイプ ゴム・樹脂カップリング寸法図（ポリウレタン樹脂エレメント・防振軸継手）
CF-B Dimension Chart
Unit [mm]
Model d1・d2 D N L1 L2 S E F M
Pilot hole Minimum Max
CF-B-070 9 10 30 72 45 28 62 6 14 40 4-M8
CF-B-080 12 14 30 76 45 30 66 6 16 42 6-M8
CF-B-100 12 14 38 98 60 42 90 6 24 64.5 6-M10
CF-B-120 15 16 48 120 70 50 106 6 28 76 6-M12
CF-B-140 15 16 55 138 85 55 116 6 30 83 6-M14
CF-B-165 19 20 60 165 100 65 138 8 36 99 6-M16
CF-B-185 29 30 80 187 115 80 170 10 45 123 6-M20

  • The pilot hole is a drill hole. The minimum values for d1 and d2 indicate the minimum hole diameters specified in our standard hole machining specifications, while the maximum values indicate the largest hole diameters that can be machined.
  • The designation for Bolt M is based on the quantity and thread size.

[Standard Hole Drilling Specifications]

?
Unit [mm]
Compliant with JIS B 1301 1959 (Old Standard Type 2) Compliant with JIS New Standard H9 JIS B 1301 1996 Compliant with Motor Standard JIS C 4210 2001
Nominal hole diameter Bore Diameter (d1, d2) Keyway width (W1, W2) Keyway depth (T1, T2) Set screw hole (M) Nominal hole diameter Hole diameter (d1, d2) Keyway width (W1, W2) Keyway depth (T1, T2) Set screw hole (M) Nominal hole diameter Hole diameter (d1, d2) Keyway width (W1, W2) Keyway depth (T1, T2) Set screw hole (M)
Tolerance H7, H8 Tolerance E9 ― Tolerance H7 ― Tolerance H7 Tolerance H9 ― Tolerance G7, F7 ― Tolerance H9 ― Tolerance G7, F7 Tolerance H9 ―
10
10 +0.022 0
― ― 2-M4 ― ― ― ― ― ― ― ― ― ―
11
11 +0.018 0
― ― 2-M4 ― ― ― ― ― ― ― ― ― ―
12
12 +0.018 0
4 +0.050 +0.020
13.5 +0.30 0
2-M4 12H
12 +0.018 0
4 +0.030 0
13.8 +0.30 0
2-M4 ― ― ― ― ―
14
14 +0.018 0
5 +0.050 +0.020
16.0 +0.30 0
2-M4 14H
14 +0.018 0
5 +0.030 0
16.3 +0.30 0
2-M4 14N
14 +0.024 +0.006
5 +0.030 0
16.3 +0.30 0
2-M4
15 15 +0.018/0 5 +0.050/+0.020 17.0 +0.30/0 2-M4 15H 15 +0.018/0 5 +0.030/0 17.3 +0.30/0 2-M4 ― ― ― ― ―
16 16 +0.018/0 5 +0.050/+0.020 18.0 +0.30/0 2-M4 16H 16 +0.018/0 5 +0.030/0 18.3 +0.30/0 2-M4 ― ― ― ― ―
17 17 +0.018/0 5 +0.050/+0.020 19.0 +0.30/0 2-M4 17H 17 +0.018/0 5 +0.030/0 19.3 +0.30/0 2-M4 ― ― ― ― ―
18 18 +0.018/0 5 +0.050/+0.020 20.0 +0.30/0 2-M4 18H 18 +0.018/0 6 +0.030/0 20.8 +0.30/0 2-M5 ― ― ― ― ―
19 19 +0.021/0 5 +0.050/+0.020 21.0 +0.30/0 2-M4 19H 19 +0.021/0 6 +0.030/0 21.8 +0.30/0 2-M5 19N 19 +0.028/+0.007 6 +0.030/0 21.8 +0.30/0 2-M5
20 20 +0.021/0 5 +0.050/+0.020 22.0 +0.30/0 2-M4 20H 20 +0.021/0 6 +0.030/0 22.8 +0.30/0 2-M5 ― ― ― ― ―
22 22 +0.021/0 7 +0.061/+0.025 25.0 +0.30/0 2-M6 22H 22 +0.021/0 6 +0.030/0 24.8 +0.30/0 2-M5 ― ― ― ― ―
24 24 +0.021/0 7 +0.061/+0.025 27.0 +0.30/0 2-M6 24H 24 +0.021/0 8 +0.036/0 27.3 +0.30/0 2-M6 24N 24 +0.028/+0.007 8 +0.036/0 27.3 +0.30/0 2-M6
25 25 +0.021/0 7 +0.061/+0.025 28.0 +0.30/0 2-M6 25H 25 +0.021/0 8 +0.036/0 28.3 +0.30/0 2-M6 ― ― ― ― ―
28 28 +0.021/0 7 +0.061/+0.025 31.0 +0.30/0 2-M6 28H 28 +0.021/0 8 +0.036/0 31.3 +0.30/0 2-M6 28N 28 +0.028/+0.007 8 +0.036/0 31.3 +0.30/0 2-M6
30 30 +0.021/0 7 +0.061/+0.025 33.0 +0.30/0 2-M6 30H 30 +0.021/0 8 +0.036/0 33.3 +0.30/0 2-M6 ― ― ― ― ―
32 32 +0.025/0 10 +0.061/+0.025 35.5 +0.30/0 2-M8 32H 32 +0.025/0 10 +0.036/0 35.3 +0.30/0 2-M8 ― ― ― ― ―
35 35 +0.025/0 10 +0.061/+0.025 38.5 +0.30/0 2-M8 35H 35 +0.025/0 10 +0.036/0 38.3 +0.30/0 2-M8 ― ― ― ― ―
38 38 +0.025/0 10 +0.061/+0.025 41.5 +0.30/0 2-M8 38H 38 +0.025/0 10 +0.036/0 41.3 +0.30/0 2-M8 38N 38 +0.050/+0.025 10 +0.036/0 41.3 +0.30/0 2-M8
40 40 +0.025/0 10 +0.061/+0.025 43.5 +0.30/0 2-M8 40H 40 +0.025/0 12 +0.043/0 43.3 +0.30/0 2-M8 ― ― ― ― ―
42 42 +0.025/0 12 +0.075/+0.032 45.5 +0.30/0 2-M8 42H 42 +0.025/0 12 +0.043/0 45.3 +0.30/0 2-M8 42N 42 +0.050/+0.025 12 +0.043/0 45.3 +0.30/0 2-M8
45 45 +0.025/0 12 +0.075/+0.032 48.5 +0.30/0 2-M8 45H 45 +0.025/0 14 +0.043/0 48.8 +0.30/0 2-M10 ― ― ― ― ―
48 48 +0.025/0 12 +0.075/+0.032 51.5 +0.30/0 2-M8 48H 48 +0.025/0 14 +0.043/0 51.8 +0.30/0 2-M10 48N 48 +0.050/+0.025 14 +0.043/0 51.8 +0.30/0 2-M10
50 50 +0.025/0 12 +0.075/+0.032 53.5 +0.30/0 2-M8 50H 50 +0.025/0 14 +0.043/0 53.8 +0.30/0 2-M10 ― ― ― ― ―
55 55 +0.030/0 15 +0.075/+0.032 60.0 +0.30/0 2-M10 55H 55 +0.030/0 16 +0.043/0 59.3 +0.30/0 2-M10 55N 55 +0.060/+0.030 16 +0.043/0 59.3 +0.30/0 2-M10
56 56 +0.030/0 15 +0.075/+0.032 61.0 +0.30/0 2-M10 56H 56 +0.030/0 16 +0.043/0 60.3 +0.30/0 2-M10 ― ― ― ― ―
60 60 +0.030/0 15 +0.075/+0.032 65.0 +0.30/0 2-M10 60H 60 +0.030/0 18 +0.043/0 64.4 +0.30/0 2-M10 60N 60 +0.060/+0.030 18 +0.043/0 64.4 +0.30/0 2-M10
63 63 +0.030/0 18 +0.075/+0.032 69.0 +0.30/0 2-M10 63H 63 +0.030/0 18 +0.043/0 67.4 +0.30/0 2-M10 ― ― ― ― ―
65 65 +0.030/0 18 +0.075/+0.032 71.0 +0.30/0 2-M10 65H 65 +0.030/0 18 +0.043/0 69.4 +0.30/0 2-M10 65N 65 +0.060/+0.030 18 +0.043/0 69.4 +0.30/0 2-M10

  • All specifications for diameters of 11 mm or less are identical to those listed in the "Former JIS Standards" section.
  • The set screw and the keyway are not located on the same plane.
  • The set screw is included with the product.
  • The positional accuracy of keyway machining is checked visually.
  • Please contact us if you require positional accuracy for the keyway relative to each hub.
  • For standard dimensions of hole machining other than those listed here, please refer to the technical documentation.
三木プーリのセンタフレックスCF-Bモデル（ポリウレタン樹脂仕様）ゴム・樹脂カップリング ご注文時の型式構成説明図

[Location of the set screw]

CF-B Position Table from End Face
Model Distance from End
Face [mm]
CF-B-070 7
CF-B-080 8
CF-B-100 10
CF-B-120 10
CF-B-140 10
CF-B-165 15
CF-B-185 15