Technical Data  Synchronous Belts / Belt Sprockets  Design Guide

Selection and Design (Lock Belt Sprockets S Type / S Type Plated)

Verification of the maximum transmission torque

Select Lock Belt Sprockets S Type according to the following procedure:

Calculate the maximum generated torque and the maximum generated thrust load by multiplying a service factor by the generated transmission capacity.

Max. Generated Torque Tmax

[SI units ]

Tmax (N・m) = 9550 × KW × SF n

[Gravity unit ]

Tmax (kgf・m) = 974 × KW × SF n

Max. Thrust Load Pmax

Pmax (N{kgf}) = Pax × SF

  • KW：Transmission capacity kW
  • SF：Service factor (Choose from the table below)
  • n：Speed r/min
  • Pax：Maximum thrust load N{kgf}

If the torque and thrust load are applied simultaneously, calculate the synthetic load MRmax using the following formula:

MRmax = (Tmax)2 + (Pmax × d/2000)2  N・m{kgf・m}  d：Shaft diameter (mm)

Compare Tmax or MRmax value calculated above with the transmission torque Mt of the sleeve.

OK Mt ≧ Tmax or MRmax

NG Mt < Tmax or MRmax

Service factor SF

Load conditions Service factor SF
Smooth transmission with no impact Small load inertia Inertia ratio of 1.0 or lower 1.2～1.5
Transmission with mild impact Medium load inertia Inertia ratio of 1.0 to 3.0 1.5～2.0
Load with major impact or forward and reverse rotation Large load inertia Inertia ratio of 3.0 or higher 2.0～5.0

Selection of the shaft

Use a shaft made of a material that satisfies the following formula:

δ0.2S ≧ 1.2 × P

δ0.2S：The yield point of the material used for the shaft (MPa)  P：Shaft-side contact pressure (Mpa)

When a hollow shaft is used, use a shaft with an inner diameter dimension dB that satisfies the following formula:

dB ≦ d × δ0.2S - 2 × P δ0.2S

d：Shaft diameter (mm)  δ0.2S：The yield point of the material used for the shaft (MPa)

aluminum type

When using at a low temperature (0°C or lower) or a high temperature (50°C or higher), disengagement between the belt and belt sprocket occurs, which may cause premature wear of the belt, etc.

[Reference ] Thermal expansion coefficient Specific Gravity (g/cm3)
Aluminum ：23.9 × 10-6 2.8
Carbon steel ：11.7 × 10-6 7.8

Approximate mass

In the case of a standard installation, the approximate mass can be figured out by adding the added mass in the table to the mass of the standard belt sprocket.

In the case of a flat installation, the approximate mass can be figured out by deducting the deducted mass in the table to the mass of the standard belt sprocket.

Sleeve frame No. Installation method
Standard installation Flat installation
Added mass kg Deducted mass kg
S1 0.1 0.1
S2 0.1 0.1
S3 0.1 0.2
S4 0.2 0.3
S5 0.3 0.4
S6 0.5 0.6
S7 0.9 1.0

Specifications for Sleeves (Lock Belt Sprockets S Type) ※Click to open or close.

S Type Sleeve Specifications

S Type Sleeve Specifications
Sleeve Material Carbon steel for machine structural use
Heat treatment Quenching and tempering
Tightening bolts Hex Cap Bolts (JIS B 1176)
Strength Classification ：12.9
Material Alloy steel for structural use
Heat treatment Quenching and tempering
Surface treatment Treated with a black oxide film

Sleeve Dimensions

Units ：mm
Sleeve
frame no. 		Shaft Bore Diameter
d		 Sleeve outer dia.
ΦD		 Pitch circle dia.
ΦDF		 Taper outer dia.
ΦDK		 Sleeve length
L		 Flange thickness
T		 Straight part
t		 Bolt head height
k		 Locking bolt size Tap hole Tightening torque
N･m {kgf･m}
S1 10 32 24 18.6 18 6 2 4 M4×16 M4 4.2 {0.43}
11
12
14
15
16
S2 15 42 32 25.2 22 7 2 5 M5×18 M5 8.3 {0.85}
16
17
18
19
20
22
S3 24 48.5 38.5 31.2 23.5 8 2.5 5 M5×20 M5 8.3 {0.85}
25
28
S4 24 56 46 38.6 26 8 2.5 5 M5×20 M5 8.3 {0.85}
25
28
30
32
35
S5 35 66 56 48.8 29 10 2.5 5 M5×22 M5 8.3 {0.85}
38
40
42
45
S6 48 80 68 60 36 12 3 6 M6×25 M6 16.8 {1.71}
50
55
S7 60 101 86 75.5 40 13 3.5 8 M8×30 M8 40.5 {4.13}
65
70

Locking bolts position

● Locking bolts position ○ Vacant hole ◎ Tap hole (Tap hole for removal)

Sleeve
frame no. 		Locking bolts position Sleeve
frame no. 		Locking bolts position
S1 Locking bolts position S5 Locking bolts position
S2 Locking bolts position S6 Locking bolts position
S3 Locking bolts position S7 Locking bolts position
S4 Locking bolts position

Specifications for Sleeves (Lock Belt Sprockets S Type) ※Click to open or close.

Sleeve Performance

Sleeve
frame no. 		No. of bolts Shaft Bore Diameter
d
mm		 Bolt size Bolt tightening torque
MA
N･m {kgf･m}		 Transmission Torque
Mt
N･m {kgf･m}		 Thrust load
Pax
kN {kgf}		 Shaft-side contact pressure
P
MPa {kgf/mm2}		 Hub contact pressure
P'
MPa {kgf/mm2}		 Min. hub dia. mm
Material
SS400 S35C S45C A7075-T6
S1 3 10 M4×16 4.2 {0.43} 43 {4.4} 8.6 {882} 196 {20.0} 111 {11.3} 35 30 29 29
11 48 {4.8} 8.6 {882} 179 {18.2} 111 {11.3} 35 30 29 29
12 52 {5.3} 8.6 {882} 164 {16.7} 111 {11.3} 35 30 29 29
14 60 {6.2} 8.6 {882} 140 {14.3} 111 {11.3} 35 30 29 29
15 65 {6.6} 8.6 {882} 131 {13.4} 111 {11.3} 35 30 29 29
16 69 {7.1} 8.6 {882} 123 {12.5} 111 {11.3} 35 30 29 29
4 10 58 {5.9} 11.5 {1176} 262 {26.7} 148 {15.1} 44 34 32 33
11 63 {6.5} 11.5 {1176} 238 {24.3} 148 {15.1} 44 34 32 33
12 69 {7.1} 11.5 {1176} 218 {22.3} 148 {15.1} 44 34 32 33
14 81 {8.2} 11.5 {1176} 187 {19.1} 148 {15.1} 44 34 32 33
15 86 {8.8} 11.5 {1176} 175 {17.8} 148 {15.1} 44 34 32 33
16 92 {9.4} 11.5 {1176} 164 {16.7} 148 {15.1} 44 34 32 33
6 14 121 {12.3} 17.3 {1764} 281 {28.6} 222 {22.6} Cannot be used 49 42 44
15 130 {13.2} 17.3 {1764} 262 {26.7} 222 {22.6} Cannot be used 49 42 44
16 138 {14.1} 17.3 {1764} 245 {25.0} 222 {22.6} Cannot be used 49 42 44
S2 3 15 M5×18 8.3 {0.85} 105 {10.7} 13.9 {1423} 163 {16.6} 101 {10.3} 45 39 38 38
16 112 {11.4} 13.9 {1423} 152 {15.5} 101 {10.3} 45 39 38 38
17 119 {12.1} 13.9 {1423} 143 {14.6} 101 {10.3} 45 39 38 38
18 126 {12.8} 13.9 {1423} 135 {13.8} 101 {10.3} 45 39 38 38
19 133 {13.5} 13.9 {1423} 128 {13.1} 101 {10.3} 45 39 38 38
20 139 {14.2} 13.9 {1423} 122 {12.4} 101 {10.3} 45 39 38 38
22 153 {15.7} 13.9 {1423} 111 {11.3} 101 {10.3} 45 39 38 38
4 15 139 {14.2} 18.6 {1898} 217 {22.1} 135 {13.8} 54 44 41 42
16 149 {15.2} 18.6 {1898} 203 {20.7} 135 {13.8} 54 44 41 42
17 158 {16.1} 18.6 {1898} 191 {19.5} 135 {13.8} 54 44 41 42
18 167 {17.1} 18.6 {1898} 181 {18.4} 135 {13.8} 54 44 41 42
19 177 {18.0} 18.6 {1898} 171 {17.5} 135 {13.8} 54 44 41 42
20 186 {19.0} 18.6 {1898} 163 {16.6} 135 {13.8} 54 44 41 42
22 205 {20.9} 18.6 {1898} 148 {15.1} 135 {13.8} 54 44 41 42
6 17 237 {24.2} 27.9 {2846} 287 {29.3} 203 {20.7} 124 59 52 54
18 251 {25.6} 27.9 {2846} 271 {27.6} 203 {20.7} 124 59 52 54
19 265 {27.0} 27.9 {2846} 257 {26.2} 203 {20.7} 124 59 52 54
20 279 {28.5} 27.9 {2846} 244 {24.9} 203 {20.7} 124 59 52 54
22 307 {31.3} 27.9 {2846} 222 {22.6} 203 {20.7} 124 59 52 54
S3 3 24 M5×20 8.3 {0.85} 167 {17.1} 13.9 {1423} 102 {10.4} 81 {8.3} 49 44 43 44
25 174 {17.8} 13.9 {1423} 98 {10.0} 81 {8.3} 49 44 43 44
28 195 {19.9} 13.9 {1423} 87 {8.9} 81 {8.3} 49 44 43 44
4 24 223 {22.8} 18.6 {1898} 135 {13.8} 108 {11.0} 56 49 47 47
25 232 {23.7} 18.6 {1898} 130 {13.3} 108 {11.0} 56 49 47 47
28 260 {26.6} 18.6 {1898} 116 {11.8} 108 {11.0} 56 49 47 47
6 24 335 {34.2} 27.9 {2846} 203 {20.7} 162 {16.6} 82 59 55 57
25 349 {35.6} 27.9 {2846} 195 {19.9} 162 {16.6} 82 59 55 57
28 391 {39.9} 27.9 {2846} 174 {17.8} 162 {16.6} 82 59 55 57
S4 3 24 M5×20 8.3 {0.85} 167 {17.1} 13.9 {1423} 85 {8.7} 55 {5.6} 53 50 49 49
25 174 {17.8} 13.9 {1423} 82 {8.3} 55 {5.6} 53 50 49 49
28 195 {19.9} 13.9 {1423} 73 {7.5} 55 {5.6} 53 50 49 49
30 209 {21.3} 13.9 {1423} 68 {7.0} 55 {5.6} 53 50 49 49
32 223 {22.8} 13.9 {1423} 64 {6.5} 55 {5.6} 53 50 49 49
35 244 {24.9} 13.9 {1423} 58 {6.0} 55 {5.6} 53 50 49 49
4 24 223 {22.8} 18.6 {1898} 114 {11.6} 73 {7.5} 58 53 51 52
25 232 {23.7} 18.6 {1898} 109 {11.1} 73 {7.5} 58 53 51 52
28 260 {26.6} 18.6 {1898} 97 {9.9} 73 {7.5} 58 53 51 52
30 279 {28.5} 18.6 {1898} 91 {9.3} 73 {7.5} 58 53 51 52
32 298 {30.4} 18.6 {1898} 85 {8.7} 73 {7.5} 58 53 51 52
35 325 {33.2} 18.6 {1898} 78 {7.9} 73 {7.5} 58 53 51 52
6 24 335 {34.2} 27.9 {2846} 170 {17.4} 110 {11.2} 69 59 57 58
25 349 {35.6} 27.9 {2846} 164 {16.7} 110 {11.2} 69 59 57 58
28 391 {39.9} 27.9 {2846} 146 {14.9} 110 {11.2} 69 59 57 58
30 418 {42.7} 27.9 {2846} 136 {13.9} 110 {11.2} 69 59 57 58
32 446 {45.5} 27.9 {2846} 128 {13.0} 110 {11.2} 69 59 57 58
35 488 {49.8} 27.9 {2846} 117 {11.9} 110 {11.2} 69 59 57 58
8 24 446 {45.5} 37.2 {3795} 227 {23.2} 146 {14.9} 88 68 64 65
25 465 {47.4} 37.2 {3795} 218 {22.3} 146 {14.9} 88 68 64 65
28 521 {53.1} 37.2 {3795} 195 {19.9} 146 {14.9} 88 68 64 65
30 558 {56.9} 37.2 {3795} 182 {18.5} 146 {14.9} 88 68 64 65
32 595 {60.7} 37.2 {3795} 170 {17.4} 146 {14.9} 88 68 64 65
35 651 {66.4} 37.2 {3795} 156 {15.9} 146 {14.9} 88 68 64 65
S5 5 35 M5×22 8.3 {0.85} 407 {41.5} 23.2 {2372} 91 {9.3} 68 {6.9} 70 64 63 63
38 442 {45.1} 23.2 {2372} 84 {8.6} 68 {6.9} 70 64 63 63
40 465 {47.4} 23.2 {2372} 80 {8.2} 68 {6.9} 70 64 63 63
42 488 {49.8} 23.2 {2372} 76 {7.8} 68 {6.9} 70 64 63 63
45 523 {53.4} 23.2 {2372} 71 {7.3} 68 {6.9} 70 64 63 63
8 35 651 {66.4} 37.2 {3795} 146 {14.9} 108 {11.0} 86 74 71 72
38 707 {72.1} 37.2 {3795} 135 {13.8} 108 {11.0} 86 74 71 72
40 744 {75.9} 37.2 {3795} 128 {13.1} 108 {11.0} 86 74 71 72
42 781 {79.7} 37.2 {3795} 122 {12.4} 108 {11.0} 86 74 71 72
45 837 {85.4} 37.2 {3795} 114 {11.6} 108 {11.0} 86 74 71 72
10 35 814 {83.0} 46.5 {4744} 183 {18.7} 135 {13.8} 102 81 77 78
38 883 {90.1} 46.5 {4744} 169 {17.2} 135 {13.8} 102 81 77 78
40 930 {94.9} 46.5 {4744} 160 {16.3} 135 {13.8} 102 81 77 78
42 976 {99.6} 46.5 {4744} 152 {15.6} 135 {13.8} 102 81 77 78
45 1046 {106.7} 46.5 {4744} 142 {14.5} 135 {13.8} 102 81 77 78
S6 6 48 M6×25 16.8 {1.71} 1116 {113.9} 46.5 {4744} 105 {10.7} 87 {8.8} 94 84 81 82
50 1162 {118.6} 46.5 {4744} 101 {10.3} 87 {8.8} 94 84 81 82
55 1279 {130.5} 46.5 {4744} 91 {9.3} 87 {8.8} 94 84 81 82
8 48 1488 {151.8} 62.0 {6326} 140 {14.3} 115 {11.8} 110 93 88 90
50 1550 {158.1} 62.0 {6326} 134 {13.7} 115 {11.8} 110 93 88 90
55 1705 {174.0} 62.0 {6326} 122 {12.4} 115 {11.8} 110 93 88 90
10 48 1860 {189.8} 77.5 {7907} 175 {17.8} 144 {14.7} 134 103 97 99
50 1937 {197.7} 77.5 {7907} 168 {17.1} 144 {14.7} 134 103 97 99
55 2131 {217.4} 77.5 {7907} 152 {15.6} 144 {14.7} 134 103 97 99
12 48 2232 {227.7} 93.0 {9488} 210 {21.4} 173 {17.7} 174 117 107 110
50 2325 {237.2} 93.0 {9488} 201 {20.5} 173 {17.7} 174 117 107 110
55 2557 {260.9} 93.0 {9488} 183 {18.7} 173 {17.7} 174 117 107 110
S7 5 60 M8×30 40.5 {4.13} 2140 {218.4} 71.3 {7280} 115 {11.7} 94 {9.6} 124 109 105 107
65 2319 {236.6} 71.3 {7280} 106 {10.8} 94 {9.6} 124 109 105 107
70 2497 {254.8} 71.3 {7280} 99 {10.1} 94 {9.6} 124 109 105 107
8 60 3424 {349.4} 114.1 {11648} 184 {18.8} 150 {15.3} 177 134 125 128
65 3710 {378.6} 114.1 {11648} 170 {17.3} 150 {15.3} 177 134 125 128
70 3995 {407.7} 114.1 {11648} 158 {16.1} 150 {15.3} 177 134 125 128
10 60 4281 {436.8} 142.7 {14560} 230 {23.5} 188 {19.2} 270 159 143 149
65 4637 {473.2} 142.7 {14560} 212 {21.7} 188 {19.2} 270 159 143 149
70 4994 {509.6} 142.7 {14560} 197 {20.1} 188 {19.2} 270 159 143 149

Specifications for Sleeves (Lock Belt Sprockets S Type Plated) ※Click to open or close.

S Type Plated Sleeve Specifications

S Type Plated Sleeve Specifications
Sleeve Material Carbon steel for machine structural use
Heat treatment Quenching and tempering
Surface treatment Electroless nickel phosphorus plating
Tightening bolts Hex Cap Bolts (JIS B 1176)
Strength Classification ：12.9
Material Alloy steel for structural use
Heat treatment Quenching and tempering
Surface treatment Special coating

Sleeve Dimensions

Units ：mm
Sleeve
frame no. 		Shaft Bore Diameter
d		 Sleeve outer dia.
ΦD		 Pitch circle dia.
ΦDF		 Taper outer dia.
ΦDK		 Sleeve length
L		 Flange thickness
T		 Straight part
t		 Bolt head height
k		 Locking bolt size
S1 10 32 24 18.6 18 6 2 4 M4×16
11
12
14
15
16
S2 17 42 32 25.2 22 7 2 5 M5×20
18
19
20
22
S3 24 48.5 38.5 31.2 23.5 8 2.5 5 M5×20
25
28
S4 30 56 46 38.6 26 8 2.5 5 M5×20
32
35
S5 38 66 56 48.8 29 10 2.5 5 M5×25
40
42
45
S6 48 80 68 60 36 12 3 6 M6×25
50
55
S7 60 101 86 75.5 40 13 3.5 8 M8×30
65
70

Locking bolts position

● Locking bolts position ○ Vacant hole ◎ Tap hole (Tap hole for removal)

Sleeve
frame no. 		Locking bolts position Sleeve
frame no. 		Locking bolts position
S1
S2
S3		 Locking bolts position S5
S7		 Locking bolts position
S4 Locking bolts position S6 Locking bolts position

Specifications for Sleeves (Lock Belt Sprockets S Type Plated) ※Click to open or close.

Sleeve Performance

Sleeve
frame no. 		No. of bolts Shaft Bore Diameter
d
mm		 Bolt size Bolt tightening torque
MA
N･m {kgf･m}		 Transmission Torque
Mt
N･m {kgf･m}		 Thrust load
Pax
kN {kgf}		 Shaft-side contact pressure
P
MPa {kgf/mm2}		 Hub contact pressure
P'
MPa {kgf/mm2}		 Min. hub dia. mm
Material
SS400 S35C S45C A7075-T6
S1 3 10 M4×16 3.4 {0.35} 43 {4.4} 8.6 {882} 196 {20.0} 111 {11.3} 35 30 29 29
11 48 {4.8} 8.6 {882} 179 {18.2} 111 {11.3} 35 30 29 29
12 52 {5.3} 8.6 {882} 164 {16.7} 111 {11.3} 35 30 29 29
14 60 {6.2} 8.6 {882} 140 {14.3} 111 {11.3} 35 30 29 29
15 65 {6.6} 8.6 {882} 131 {13.4} 111 {11.3} 35 30 29 29
16 69 {7.1} 8.6 {882} 123 {12.5} 111 {11.3} 35 30 29 29
6 14 121 {12.3} 17.3 {1764} 281 {28.6} 222 {22.6} Cannot be used 49 42 44
15 130 {13.2} 17.3 {1764} 262 {26.7} 222 {22.6} Cannot be used 49 42 44
16 138 {14.1} 17.3 {1764} 245 {25.0} 222 {22.6} Cannot be used 49 42 44
S2 3 17 M5×20 6.8 {0.69} 119 {12.1} 13.9 {1423} 143 {14.6} 101 {10.3} 45 39 38 38
18 126 {12.8} 13.9 {1423} 135 {13.8} 101 {10.3} 45 39 38 38
19 133 {13.5} 13.9 {1423} 128 {13.1} 101 {10.3} 45 39 38 38
20 139 {14.2} 13.9 {1423} 122 {12.4} 101 {10.3} 45 39 38 38
22 153 {15.7} 13.9 {1423} 111 {11.3} 101 {10.3} 45 39 38 38
6 17 237 {24.2} 27.9 {2846} 287 {29.3} 203 {20.7} 124 59 52 54
18 251 {25.6} 27.9 {2846} 271 {27.6} 203 {20.7} 124 59 52 54
19 265 {27.0} 27.9 {2846} 257 {26.2} 203 {20.7} 124 59 52 54
20 279 {28.5} 27.9 {2846} 244 {24.9} 203 {20.7} 124 59 52 54
22 307 {31.3} 27.9 {2846} 222 {22.6} 203 {20.7} 124 59 52 54
S3 3 24 M5×20 6.8 {0.69} 167 {17.1} 13.9 {1423} 102 {10.4} 81 {8.3} 49 44 43 44
25 174 {17.8} 13.9 {1423} 98 {10.0} 81 {8.3} 49 44 43 44
28 195 {19.9} 13.9 {1423} 87 {8.9} 81 {8.3} 49 44 43 44
6 24 335 {34.2} 27.9 {2846} 203 {20.7} 162 {16.6} 82 59 55 57
25 349 {35.6} 27.9 {2846} 195 {19.9} 162 {16.6} 82 59 55 57
28 391 {39.9} 27.9 {2846} 174 {17.8} 162 {16.6} 82 59 55 57
S4 4 30 M5×20 6.8 {0.69} 279 {28.5} 18.6 {1898} 91 {9.3} 73 {7.5} 58 53 51 52
32 298 {30.4} 18.6 {1898} 85 {8.7} 73 {7.5} 58 53 51 52
35 325 {33.2} 18.6 {1898} 78 {7.9} 73 {7.5} 58 53 51 52
8 30 558 {56.9} 37.2 {3795} 182 {18.5} 146 {14.9} 88 68 64 65
32 595 {60.7} 37.2 {3795} 170 {17.4} 146 {14.9} 88 68 64 65
35 651 {66.4} 37.2 {3795} 156 {15.9} 146 {14.9} 88 68 64 65
S5 5 38 M5×25 6.8 {0.69} 442 {45.1} 23.2 {2372} 84 {8.6} 68 {6.9} 70 64 63 63
40 465 {47.4} 23.2 {2372} 80 {8.2} 68 {6.9} 70 64 63 63
42 488 {49.8} 23.2 {2372} 76 {7.8} 68 {6.9} 70 64 63 63
45 523 {53.4} 23.2 {2372} 71 {7.3} 68 {6.9} 70 64 63 63
10 38 883 {90.1} 46.5 {4744} 169 {17.2} 135 {13.8} 102 81 77 78
40 930 {94.9} 46.5 {4744} 160 {16.3} 135 {13.8} 102 81 77 78
42 976 {99.6} 46.5 {4744} 152 {15.6} 135 {13.8} 102 81 77 78
45 1046 {106.7} 46.5 {4744} 142 {14.5} 135 {13.8} 102 81 77 78
S6 6 48 M6×25 13.6 {1.39} 1116 {113.9} 46.5 {4744} 105 {10.7} 87 {8.8} 94 84 81 82
50 1162 {118.6} 46.5 {4744} 101 {10.3} 87 {8.8} 94 84 81 82
55 1279 {130.5} 46.5 {4744} 91 {9.3} 87 {8.8} 94 84 81 82
12 48 2232 {227.7} 93.0 {9488} 210 {21.4} 173 {17.7} 174 117 107 110
50 2325 {237.2} 93.0 {9488} 201 {20.5} 173 {17.7} 174 117 107 110
55 2557 {260.9} 93.0 {9488} 183 {18.7} 173 {17.7} 174 117 107 110
S7 5 60 M8×30 32.8 {3.35} 2140 {218.4} 71.3 {7280} 115 {11.7} 94 {9.6} 124 109 105 107
65 2319 {236.6} 71.3 {7280} 106 {10.8} 94 {9.6} 124 109 105 107
70 2497 {254.8} 71.3 {7280} 99 {10.1} 94 {9.6} 124 109 105 107
10 60 4281 {436.8} 142.7 {14560} 230 {23.5} 188 {19.2} 270 159 143 149
65 4637 {473.2} 142.7 {14560} 212 {21.7} 188 {19.2} 270 159 143 149
70 4994 {509.6} 142.7 {14560} 197 {20.1} 188 {19.2} 270 159 143 149