ALS [Type B]

This curved-jaw coupling features a simple design consisting of a cushioning resin (polyurethane elastomer)—referred to as an "element"—sandwiched between two hubs; the use of a curved-jaw design for the power transmission surface increases the transmission capacity.The element uses resin with a hardness of 97 JIS A and features a loose-fit design.

[Specifications] Pilot hole / Key and set screw type

Model Torque Tolerance Maximum rotational speed [min⁻¹] Static torsional spring constant [N·m/rad] Radial spring constant [N/mm] Moment of inertia [kg·m²] Mass [kg] Standard Bored Part Price [JPY] Price for pre-drilled parts [JPY]
Rated torque [N·m] Maximum [N·m] Eccentricity [mm] Angular Deviation [°] Axial [mm]
ALS-030-B 12.5 25 0.17 1 –0.2 to +1.0 15,900 90 460 6.13×10⁻⁶ 0.045
ALS-040-B 17 34 0.20 1 –0.5 to +1.2 11,900 400 640 3.86×10⁻⁵ 0.15
ALS-055-B 60 120 0.22 1 –0.2 to +1.4 8,700 1,150 400 1.66×10⁻⁴ 0.35
ALS-065-B 160 320 0.25 1 –0.6 to +1.5 7400 2000 800 3.57×10⁻⁴ 0.51
ALS-080-B 325 650 0.28 1 –0.9 to +1.8 6000 4550 600 1.06×10⁻³ 1.01
ALS-095-B 450 900 0.32 1 –0.5 to +2.0 5,000 12,000 800 2.22×10⁻³ 1.48
ALS-105-B 525 1050 0.36 1 –0.9 to +2.0 4,500 15,000 2000 3.70×10⁻³ 2.02
  • The maximum rotational speed does not take dynamic balance into account.
  • The values for each spring constant are at 20°C.
  • The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions] Pilot hole / Key and set screw type

三木プーリのスターフレックス(ジョーカップリング)ALSモデルBタイプ(キー止ねじ仕様)ゴム・樹脂カップリング寸法図 取付寸法および軸径寸法を示す寸法図
Unit [mm]
Model d1・d2 D L L1・L2 E S C
Pilot hole Min. Max
ALS-030-B 5 6 14 30 35 11 13 1.5 5.5
ALS-040-B 5 8 22 40 66 25 16 2 12.5
ALS-055-B 5 10 28 55 78 30 18 2 15
ALS-065-B 5 14 38 65 90 35 20 2.5 17.5
ALS-080-B 10 19 45 80 114 45 24 3 22.5
ALS-095-B 8 19 55 95 126 50 26 3 25
ALS-105-B 10 19 60 105 140 56 28 3.5 28
  • A pilot hole refers to a center hole.

[Standard Hole Diameter]

Model Standard hole diameter d1・d2 [mm]
6 6.35 7 8 9 9.525 10 11 12 14 15 16 17 18 19 20 22 24 25 28 30 32 35 38 40 42 45 48 50 55 56 60
ALS-030-B
ALS-040-B
ALS-055-B
ALS-065-B
ALS-080-B
ALS-095-B
ALS-105-B
  • The hole diameters indicated by the ● symbol and numerical values are standard hole diameters.
  • Sizes up to φ11 have no keyway; sizes of φ12 and larger can be machined to accommodate motors compliant with the old JIS standard, the new JIS standard, and the latest standard.
三木プーリのスターフレックス(ジョーカップリング)ALSモデル Bタイプ(キー止ねじ仕様)ゴム・樹脂カップリング ご注文時の型式構成説明図

[Standard Hole Specifications] Keyways and Set Screws

?
JIS Keyway and Hole Diameter Chart
Unit [mm]
Corresponds to JIS B 1301 1959 (Type 2, Old Standard) New JIS Standard H9 (Compliant with JIS B 1301:1996) JIS New Standard JS9 (Compliant with JIS B 1301:1996) Motor Standard: Compliant with JIS C 4210 2001
Nominal Bore 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)
Nominal hole diameter Hole diameter
(d1, d2)
Keyway width
(W1, W2)
Keyway depth
(T1, T2)
Set screw hole
(M)
Nominal hole diameter Tolerance H7, H8 Tolerance E9 Nominal hole diameter Tolerance H7 Tolerance H9 Nominal hole diameter Tolerance H7 Tolerance JS9 Nominal hole diameter Tolerance G7, F7 Tolerance H9
3 3+0.0180 1-M3
4 4+0.0180 2-M3
5 5 + 0.0180 2-M3
6 6 + 0.0180 2-M4
6.35 6.35 + 0.0220 2-M4
7 7+0.0220 2-M4
8 8 + 0.0220 2-M4
9 9 + 0.0220 2-M4
9.525 9.525 + 0.0220 2-M4
10 10 + 0.0220 2-M4
11 11+0.0180 2-M4
12 12 + 0.0180 4 + 0.05 + 0.02 13.5 + 0.30 2-M4 12H 12 + 0.0180 4 + 0.030 13.8 + 0.30 2-M4 12J 12 + 0.0180 4 + 0.015 – 0.015 13.8 + 0.30 2-M4
14 14 + 0.0180 5 + 0.05 + 0.02 16.0 + 0.30 2-M4 14H 14 + 0.0180 5 + 0.030 16.3 + 0.30 2-M4 14J 14 + 0.0180 5 + 0.015 – 0.015 16.3 + 0.30 2-M4 14N 14 + 0.024 + 0.006 5 + 0.030 16.3 + 0.30 2-M4
15 15 + 0.0180 5 + 0.05 + 0.02 17.0 + 0.30 2-M4 15H 15 + 0.0180 5 + 0.030 17.3 + 0.30 2-M4 15J 15 + 0.0180 5 + 0.015 – 0.015 17.3 + 0.30 2-M4
16 16 + 0.0180 5 + 0.05 + 0.02 18.0 + 0.30 2-M4 16H 16 + 0.0180 5 + 0.030 18.3 + 0.30 2-M4 16J 16 + 0.0180 5 + 0.015 – 0.015 18.3 + 0.30 2-M4
17 17 + 0.0180 5 + 0.05 + 0.02 19.0 + 0.30 2-M4 17H 17 + 0.0180 5 + 0.030 19.3 + 0.30 2-M4 17J 17 + 0.0180 5 + 0.015 – 0.015 19.3 + 0.30 2-M4
18 18 + 0.0180 5 + 0.05 + 0.02 20.0 + 0.30 2-M4 18H 18 + 0.0180 6 + 0.030 20.8 + 0.30 2-M5 18J 18 + 0.0180 6 + 0.015 – 0.015 20.8 + 0.30 2-M5
19 19 + 0.0210 5 + 0.05 + 0.02 21.0 + 0.30 2-M4 19H 19 + 0.0210 6 + 0.030 21.8 + 0.30 2-M5 19J 19 + 0.0210 6 + 0.015 – 0.015 21.8 + 0.30 2-M5 19N 19 + 0.028 + 0.007 6 + 0.030 21.8 + 0.30 2-M5
20 20 + 0.0210 5 + 0.05 + 0.02 22.0 + 0.30 2-M4 20H 20 + 0.0210 6 + 0.030 22.8 + 0.30 2-M5 20J 20 + 0.0210 6 + 0.015 – 0.015 22.8 + 0.30 2-M5
22 22 + 0.0210 7 + 0.061 + 0.025 25.0 + 0.30 2-M6 22H 22 + 0.0210 6 + 0.030 24.8 + 0.30 2-M5 22J 22 + 0.0210 6 + 0.015 – 0.015 24.8 + 0.30 2-M5
24 24 + 0.0210 7 + 0.061 + 0.025 27.0 + 0.30 2-M6 24H 24 + 0.0210 8 + 0.0360 27.3 + 0.30 2-M6 24J 24 + 0.0210 8 + 0.018 – 0.018 27.3 + 0.30 2-M6 24N 24 + 0.028 + 0.007 8 + 0.0360 27.3 + 0.30 2-M6
25 25 + 0.0210 7 + 0.061 + 0.025 28.0 + 0.30 2-M6 25H 25 + 0.0210 8 + 0.0360 28.3 + 0.30 2-M6 25J 25 + 0.0210 8 + 0.018 – 0.018 28.3 + 0.30 2-M6
28 28 + 0.0210 7 + 0.061 + 0.025 31.0 + 0.30 2-M6 28H 28 + 0.0210 8 + 0.0360 31.3 + 0.30 2-M6 28J 28 + 0.0210 8 + 0.018 – 0.018 31.3 + 0.30 2-M6 28N 28 + 0.028 + 0.007 8 + 0.0360 31.3 + 0.30 2-M6
30 30 + 0.0210 7 + 0.061 + 0.025 33.0 + 0.30 2-M6 30H 30 + 0.0210 8 + 0.0360 33.3 + 0.30 2-M6 30J 30 + 0.0210 8 + 0.018 – 0.018 33.3 + 0.30 2-M6
32 32 + 0.0250 10 + 0.061 + 0.025 35.5 + 0.30 2-M8 32H 32 + 0.0250 10 + 0.0360 35.3 + 0.30 2-M8 32J 32 + 0.0250 10 + 0.018 – 0.018 35.3 + 0.30 2-M8
35 35 + 0.0250 10 + 0.061 + 0.025 38.5 + 0.30 2-M8 35H 35 + 0.0250 10 + 0.0360 38.3 + 0.30 2-M8 35J 35+0.0250 10 + 0.018 – 0.018 38.3 + 0.30 2-M8
38 38 + 0.0250 10 + 0.061 + 0.025 41.5 + 0.30 2-M8 38H 38 + 0.0250 10 + 0.0360 41.3 + 0.30 2-M8 38J 38+0.0250 10 + 0.018 – 0.018 41.3 + 0.30 2-M8 38N 38 + 0.05 + 0.025 10 + 0.0360 41.3 + 0.30 2-M8
40 40 + 0.0250 10 + 0.06 1 + 0.025 43.5 + 0.30 2-M8 40H 40 + 0.0250 12 + 0.0430 43.3 + 0.30 2-M8 40J 40 + 0.0250 12 + 0.0215 – 0.0215 43.3 + 0.30 2-M8
42 42 + 0.0250 12 + 0.075 + 0.032 45.5 + 0.30 2-M8 42H 42 + 0.0250 12 + 0.0430 45.3 + 0.30 2-M8 42J 42 + 0.0250 12 + 0.0215 – 0.0215 45.3 + 0.30 2-M8 42N 42 + 0.05 + 0.025 12 + 0.0430 45.3 + 0.30 2-M8
45 45 + 0.0250 12 + 0.075 + 0.032 48.5 + 0.30 2-M8 45H 45 + 0.0250 14 + 0.0430 48.8 + 0.30 2-M10 45J 45 + 0.0250 14 + 0.0215 – 0.0215 48.8 + 0.30 2-M10
48 48 + 0.0250 12 + 0.075 + 0.032 51.5 + 0.30 2-M8 48H 48 + 0.0250 14 + 0.0430 51.8 + 0.30 2-M10 48J 48 + 0.0250 14 + 0.0215 – 0.0215 51.8 + 0.30 2-M10 48N 48 + 0.05 + 0.025 14 + 0.0430 51.8 + 0.30 2-M10
50 50 + 0.0250 12 + 0.075 + 0.032 53.5 + 0.30 2-M8 50H 50 + 0.0250 14 + 0.0430 53.8 + 0.30 2-M10 50J 50 + 0.0250 14 + 0.0215 – 0.0215 53.8 + 0.30 2-M10
55 55 + 0.030 15 + 0.075 + 0.032 60.0 + 0.30 2-M10 55H 55 + 0.030 16 + 0.0430 59.3 + 0.30 2-M10 55J 55 + 0.030 16 + 0.0215 – 0.0215 59.3 + 0.30 2-M10 55N 55 + 0.06 + 0.03 16 + 0.0430 59.3 + 0.30 2-M10
56 56 + 0.030 15 + 0.075 + 0.032 61.0 + 0.30 2-M10 56H 56 + 0.030 16 + 0.0430 60.3 + 0.30 2-M10 56J 56 + 0.030 16 + 0.0215 – 0.0215 60.3 + 0.30 2-M10
60 60 + 0.030 15 + 0.075 + 0.032 65.0 + 0.30 2-M10 60H 60 + 0.030 18 + 0.0430 64.4 + 0.30 2-M10 60J 60 + 0.030 18 + 0.0215 – 0.0215 64.4 + 0.30 2-M10 60N 60 + 0.06 + 0.03 18 + 0.0430 64.4 + 0.30 2-M10
  • All specifications for diameters of 11 mm or less are identical to those listed in the "Old JIS Standards" column.
  • For the ALS-014, the set screw size is M3.
  • The set screws 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 specific positioning accuracy for the keyways relative to each hub.
  • For standard dimensions of hole machining other than those listed here, please refer to the technical data at the end of this document.

[Location of the set screw]

Unit [mm]
Model Distance from end face [mm]
ALS-014 3.5
ALS-020 5
ALS-030 5.5
ALS-040 12.5
ALS-055 15
ALS-065 17.5
ALS-080 22.5
ALS-095 25
ALS-105 28

[Specifications] Clamp-fastening type

Model Tolerance Maximum rotational speed [min⁻¹] Static torsional spring constant [N·m/rad] Radial spring constant [N/mm] Moment of inertia [kg·m²] Mass [kg] Price [JPY]
Eccentricity [mm] Angular offset [°] Axial length [mm]
ALS-030-B 0.17 1 –0.2 to +1.0 10,000 90 460 6.07×10⁻⁶ 0.043
ALS-040-B 0.2 1 –0.5 to +1.2 10,000 400 640 4.00×10⁻⁵ 0.16
ALS-055-B 0.22 1 –0.2 to +1.4 7,000 1,150 400 1.63×10⁻⁴ 0.34
ALS-065-B 0.25 1 –0.6 to +1.5 5900 2,000 800 3.69×10⁻⁴ 0.54
ALS-080-B 0.28 1 –0.9 to +1.8 4,800 4,550 600 1.04×10⁻³ 1.00
  • The maximum rotational speed does not take dynamic balance into account.
  • The values for each spring constant are at 20°C.
  • The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions] Clamp-type

三木プーリのスターフレックス(ジョーカップリング)ALSモデルBタイプ(クランプ締結仕様)ゴム・樹脂カップリング寸法図 取付寸法および軸径寸法を示す寸法図
Unit [mm]
Model d1・d2 D DB L L1・L2 E S B G M Tightening torque [N·m]
Minimum Max
ALS-030-B 6 14 30 30 35 11 13 1.5 5.5 10.5 1-M3 1.5
ALS-040-B 8 20 40 43.2 66 25 16 2 12.5 15 1-M5 7
ALS-055-B 10 28 55 55 78 30 18 2 10.5 20 1-M6 14
ALS-065-B 14 35 65 69.8 90 35 20 2.5 11.5 24.5 1-M8 30
ALS-080-B 19 45 80 80 114 45 24 3 11.5 30 1-M8 30
  • The φDB dimension refers to the measurement when the head of the clamping bolt protrudes beyond the outer diameter of the hub.
  • The designation for Clamp Bolt M consists of the quantity followed by the thread size; the quantity refers to the number of bolts on one side.

[Standard Bore Diameter and Allowable Torque]

Model Standard Bore Diameters d1 and d2 [mm] and Allowable Transmission Torque [N·m]
6 6.35 7 8 9 9.525 10 11 12 14 15 16 18 19 20 22 24 25 28 30 32 35 38 40 42 45
ALS-030-B 2.0 2.2 2.7 3.4 4 4.4 4.7 5.4 6.0 7.4
ALS-040-B 8 12 14 16 19 23 31 34 34 34 34 34
ALS-055-B 21 25 28 35 38 41 48 51 54 61 67 71 80
ALS-065-B 40 44 47 54 58 61 68 75 79 89 96 103 114
ALS-080-B 53 59 72 84 90 108 121 133 151 170 182 194 212
  • The hole diameters listed in the table correspond to standard hole diameters.
  • The hole diameter of the field containing the numerical value is limited by the allowable torque, which is determined by the holding force at the shaft fastening section. The numerical value indicates the allowable torque [N·m].
  • The dimensional tolerance for the mating shaft is h7. However, for a hole diameter of φ35, the shaft tolerance is +0.010 to -0.025.
  • The range of hole diameters we can accommodate is between the minimum and maximum diameters listed in the dimension table. However, we can accommodate hole diameters not listed in the table above; please contact us for more information.

[Element]

三木プーリのスターフレックス(ジョーカップリング)ALSモデルBタイプゴム・樹脂カップリング寸法図 外形寸法および主要部寸法を示す寸法図
Unit [mm]
Model F R3 Price [JPY]
ALS-030-B-EL 10.2 10.5
ALS-040-B-EL 12 18.5
ALS-055-B-EL 14 27.5
ALS-065-B-EL 15 32
ALS-080-B-EL 18 41
ALS-095-B-EL 20 47
ALS-105-B-EL 21 50
三木プーリのスターフレックス(ジョーカップリング)ALSモデル Bタイプ ゴム・樹脂カップリング ご注文時の型式構成説明図