ALS [R] Type | Miki Pulley

This curved-jaw coupling features a simple design consisting of a cushioning resin (polyurethane elastomer)—referred to as an "element"—sandwiched between two hubs. By using a curved jaw as the power transmission surface, the coupling achieves increased transmission capacity. The element is made of resin with a hardness of 97 (JIS A) and features a tight-fit design that incorporates pre-compression.

[Specifications] Pilot hole / Keyed 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 Drilled Part Price [JPY]	Price for pre-drilled parts [JPY]
Model	Rated torque [N·m]	Maximum [N·m]	Eccentricity [mm]	Angular Deviation [°]	Axial [mm]	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 Drilled Part Price [JPY]	Price for pre-drilled parts [JPY]
ALS-014-R	2	4	0.10	1	0 to +0.6	34100	21	380	1.91×10⁻⁷	0.007	－	－
ALS-020-R	5	10	0.10	1	0 to +0.8	23,800	43	400	1.08×10⁻⁶	0.018	－	－
ALS-030-R	12.5	25	0.10	1	0 to +1.0	15,900	136	650	6.25×10⁻⁶	0.047	－	－
ALS-040-R	17	34	0.10	1	0 to +1.2	11,900	1,550	1700	3.87×10⁻⁵	0.15	－	－
ALS-055-R	60	120	0.10	1	0 to +1.4	8700	2000	1350	1.66×10⁻⁴	0.35	－	－
ALS-065-R	160	320	0.10	1	0 to +1.5	7400	3100	1400	3.57×10⁻⁴	0.51	－	－
ALS-080-R	325	650	0.10	1	0 to +1.8	6000	6000	1710	1.06×10⁻³	1.01	－	－
ALS-095-R	450	900	0.10	1	–0.5 to +2.0	5000	10,000	4,200	2.24×10⁻³	1.50	－	－
ALS-105-R	525	1050	0.15	1	–0.9 to +2.0	4,500	12,000	5,000	3.72×10⁻³	2.05	－	－

Axial displacement of the ALS-014 to 018-R models is not permitted in the negative direction.
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R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	CAD File No.
Model	Pilot hole	Minimum	Max	D	L	L1・L2	E	S	C	CAD File No.
ALS-014-R	3	3	6.5	14	22	7	8	1	3.5	ALS-HH1
ALS-020-R	4	4	9.6	20	30	10	10	1	5	ALS-HH2
ALS-030-R	5	6	14	30	35	11	13	1.5	5.5	ALS-HH3
ALS-040-R	5	8	22	40	66	25	16	2	12.5	ALS-HH4
ALS-055-R	5	10	28	55	78	30	18	2	15	ALS-HH5
ALS-065-R	5	14	38	65	90	35	20	2.5	17.5	ALS-HH6
ALS-080-R	10	19	45	80	114	45	24	3	22.5	ALS-HH7
ALS-095-R	8	19	55	95	126	50	26	3	25	－
ALS-105-R	10	19	60	105	140	56	28	3.5	28	－

A pilot hole refers to a center hole.

[Standard Hole Diameter]

Unit [mm]

Model	Standard Hole Diameter d1・d2 [mm]
Model	3	4	5	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-014-R	●	●	●	●	●
ALS-020-R		●	●	●	●	●	●	●	●
ALS-030-R				●	●	●	●	●	●	●	●	●	●
ALS-040-R							●	●	●	●	●	●	●	●	●	●	●	●	●	●
ALS-055-R										●	●	●	●	●	●	●	●	●	●	●	●	●	●
ALS-065-R													●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
ALS-080-R																		●	●	●	●	●	●	●	●	●	●	●	●	●
ALS-095-R																		●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
ALS-105-R																		●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●

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 R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

Keyway Dimensions Table

Unit [mm]

Compliant with JIS B 1301 1959 (Type 2, Old Standard)					New JIS Standard H9 (Compliant with JIS B 1301:1996)					New JIS Standard (Heisei 9) JIS B 1301 1996					Motor Standard: Compliant with 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)	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 + 0.050 + 0.020	13.5 + 0.30	2-M4	12H	12 + 0.0180	4 + 0.0300	13.8 + 0.30	2-M4	12J	12 + 0.0180	4±0.0150	13.8 + 0.30	2-M4	－
14	14 + 0.0180	5 + 0.050 + 0.020	16.0 + 0.30	2-M4	14H	14 + 0.0180	5 + 0.0300	16.3 + 0.30	2-M4	14J	14 + 0.0180	5±0.0150	16.3 + 0.30	2-M4	14N	14+0.024+0.006	5 + 0.0300	16.3 + 0.30	2-M4
15	15 + 0.0180	5 + 0.050 + 0.020	17.0 + 0.30	2-M4	15H	15 + 0.0180	5 + 0.0300	17.3 + 0.30	2-M4	15J	15 + 0.0180	5±0.0150	17.3 + 0.30	2-M4	－
16	16 + 0.0180	5 + 0.050 + 0.020	18.0 + 0.30	2-M4	16H	16 + 0.0180	5 + 0.0300	18.3 + 0.30	2-M4	16J	16 + 0.0180	5±0.0150	18.3 + 0.30	2-M4	－
17	17 + 0.0180	5 + 0.050 + 0.020	19.0 + 0.30	2-M4	17H	17+0.0180	5 + 0.0300	19.3 + 0.30	2-M4	17J	17 + 0.0180	5±0.0150	19.3 + 0.30	2-M4	－
18	18 + 0.0180	5 + 0.050 + 0.020	20.0 + 0.30	2-M4	18H	18 + 0.0180	6 + 0.0300	20.8 + 0.30	2-M5	18J	18 + 0.0180	6±0.0150	20.8 + 0.30	2-M5	－
19	19 + 0.0210	5 + 0.050 + 0.020	21.0 + 0.30	2-M4	19H	19 + 0.0210	6 + 0.0300	21.8 + 0.30	2-M5	19J	19 + 0.0210	6±0.0150	21.8 + 0.30	2-M5	19N	19+0.028+0.007	6 + 0.0300	21.8 + 0.30	2-M5
20	20 + 0.0210	5 + 0.05 0 + 0.020	22.0 + 0.30	2-M4	20H	20 + 0.0210	6 + 0.0300	22.8 + 0.30	2-M5	20J	20 + 0.0210	6±0.0150	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 + 0.0300	24.8 + 0.30	2-M5	22J	22 + 0.0210	6±0.0150	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±0.0180	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±0.0180	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±0.0180	31.3 + 0.30	2-M6	28N	28 + 0.02 8 + 0.007	8 + 0.0360	31.3 + 0.30	2-M6
30	30 + 0.0210	7 + 0.06 1 + 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±0.0180	33.3 + 0.30	2-M6	－
32	32 + 0.0250	10 + 0.06 1 + 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±0.0180	35.3 + 0.30	2-M8	－
35	35 + 0.0250	10 + 0.06 1 + 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±0.0180	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±0.0180	41.3 + 0.30	2-M8	38N	38 + 0.050 + 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	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	45.3 + 0.30	2-M8	42N	42 + 0.050 + 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	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	51.8 + 0.30	2-M10	48N	48 + 0.050 + 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	53.8 + 0.30	2-M10	－
55	55 + 0.0300	15 + 0.075 + 0.032	60.0 + 0.30	2-M10	55H	55 + 0.0300	16 + 0.0430	59.3 + 0.30	2-M10	55J	55+0.0300	16±0.0215	59.3 + 0.30	2-M10	55N	55 + 0.060 + 0.030	16 + 0.0430	59.3 + 0.30	2-M10
56	56 + 0.0300	15 + 0.075 + 0.032	61.0 + 0.30	2-M10	56H	56 + 0.0300	16 + 0.0430	60.3 + 0.30	2-M10	56J	56 + 0.0300	16±0.0215	60.3 + 0.30	2-M10	－
60	60 + 0.0300	15 + 0.075 + 0.032	65.0 + 0.30	2-M10	60H	60 + 0.0300	18 + 0.0430	64.4 + 0.30	2-M10	60J	60 + 0.0300	18±0.0215	64.4 + 0.30	2-M10	60N	60 + 0.060 + 0.030	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 positional 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

Unit [mm]

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]
Model	Eccentricity [mm]	Angular offset [°]	Axial length [mm]	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]
ALS-014-R	0.1	1	0 to +0.6	10,000	21	380	1.98×10⁻⁷	0.007	－
ALS-020-R	0.1	1	0 to +0.8	10,000	43	400	1.09×10⁻⁶	0.019	－
ALS-030-R	0.1	1	0 to +1.0	10,000	136	650	6.19×10⁻⁶	0.045	－
ALS-040-R	0.1	1	0 to +1.2	10,000	1550	1700	4.01×10⁻⁵	0.16	－
ALS-055-R	0.1	1	0 to +1.4	7000	2000	1350	1.63×10⁻⁴	0.34	－
ALS-065-R	0.1	1	0 to +1.5	5900	3100	1400	3.69×10⁻⁴	0.54	－
ALS-080-R	0.1	1	0 to +1.8	4800	6000	1710	1.04×10⁻³	1.00	－

Displacement in the axial direction is not permitted in the negative direction.
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R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]	CAD File No.
Model	Minimum	Max	D	DB	L	L1・L2	E	S	B	G	M	Tightening torque [N·m]	CAD File No.
ALS-014-R	3	6	14	16.1	22	7	8	1	3.5	4.8	1-M2	0.4	ALS-BB1
ALS-020-R	4	8	20	20	30	10	10	1	5	6.5	1-M2.5	1	ALS-BB2
ALS-030-R	6	14	30	30	35	11	13	1.5	5.5	10.5	1-M3	1.5	ALS-BB3
ALS-040-R	8	20	40	43.2	66	25	16	2	12.5	15	1-M5	7	ALS-BB4
ALS-055-R	10	28	55	55	78	30	18	2	10.5	20	1-M6	14	ALS-BB5
ALS-065-R	14	35	65	69.8	90	35	20	2.5	11.5	24.5	1-M8	30	ALS-BB6
ALS-080-R	19	45	80	80	114	45	24	3	11.5	30	1-M8	30	ALS-BB7

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]
Model	3	4	5	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-014-R	0.31	0.42	0.54	0.65
ALS-020-R		1.2	1.6	2.1	2.2	2.6	3
ALS-030-R				2	2.2	2.7	3.4	4	4.4	4.7	5.4	6	7.4
ALS-040-R							8	12	14	16	19	23	31	34	34	34	34	34
ALS-055-R										21	25	28	35	38	41	48	51	54	61	67	71	80
ALS-065-R													40	44	47	54	58	61	68	75	79	89	96	103	114
ALS-080-R																	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 in the column containing the numerical values is limited by the holding force at the shaft fastening section, which determines the allowable torque. The numerical values indicate 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 dimensional chart. However, we can accommodate hole diameters not listed in the table above; please contact us for more information.

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 Rタイプ（クランプ締結仕様）ゴム・樹脂カップリングご注文時の型式構成説明図

[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R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	R1	R2	K	A	Price [JPY]
ALS-014-R-EL	6.2	3.5	－	2.5	1.2	－
ALS-020-R-EL	8.2	6.2	－	3.4	1.4	－
ALS-030-R-EL	10.2	8.5	－	4	2.2	－
ALS-040-R-EL	12	18	－	4.5	3	－
ALS-055-R-EL	14	24	－	5.5	3	－
ALS-065-R-EL	15	30	－	5.5	4	－
ALS-080-R-EL	18	37	15	7	4	－
ALS-095-R-EL	20	43	20	8	4	－
ALS-105-R-EL	21	50	20	8.5	4	－

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 R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