Standard belt S2M
Caution
- Since the G type has been unified with the GB type, if the part number suffix is G, it will be the GB type.
Product Description
Standard timing belts made of rubber or urethane with a round tooth profile for smooth engagement.
[Features]
· A product with a wide variety of tooth profiles and sizes, offering excellent general-purpose usability and availability.
· The belt is flexible and can be used with small pulley diameters.
· Smooth meshing enables quiet operation.
· Can be used with low shaft load.
[Applications]
· Ideal for office equipment, vending machines, electronic application devices, measuring instruments, and home appliances.
INDEX
Drawing
Standard Belt Size
Belt Tooth Profile (Super Torque S2M)
Standard Belt Size
Product Specification
Super Torque S2M Specifications
Super Torque (G, U) Timing Belt
Standard timing belts made of rubber or urethane with a round tooth profile for smooth engagement.
A product with a wide variety of tooth profiles and sizes, offering excellent general-purpose usability and availability.
Relationship between belt width and pulley width
| Belt type | Belt width | Pulley tooth width (mm) | ||
|---|---|---|---|---|
| Nominal | Width (mm) | With flange | No flange | |
| S2M | 40 | 4 | 5 | 9 |
| 60 | 6 | 7 | 11 | |
| 100 | 10 | 11 | 15 | |
Belt width tolerance
Belt width tolerance for Super Torque
| Belt width (mm) | Belt Nominal Width | Belt Length [Upper: Nominal Length, Lower: Length (mm)] | ||
|---|---|---|---|---|
| 36 to 330 91.44 to 838.20 | 331 to 660 838.21 to 1676.40 | 661 to 1700 1676.41 to 4318.00 | ||
| 3.4 to 11.4 | 025,031 037 | +0.3 -0.6 | +0.3 -0.6 | +0.3 -0.6 |
| 11.5 to 38.1 | 050,075 100,150 | +/- 0.6 | +/- 0.6 | +/- 0.6 |
| 38.2 to 50.8 | 200 | +/- 0.6 | +/- 1.0 | +1.0 -1.3 |
| 50.9 to 76.2 | 300 | +1.3 -1.6 | ±1.6 | +1.6 -2.0 |
Belt width tolerance for trapezoidal tooth profile
| Belt width (mm) | Belt length (mm) | |||
|---|---|---|---|---|
| 351 or less | Over 351 up to 840 | Over 840 up to 1680 | Over 1680 | |
| 3 or less | +0.3 -0.4 | +0.3 -0.4 | +0.3 -0.4 | +0.3 -0.4 |
| More than 3 and up to 10 | +0.3 -0.6 | +0.3 -0.6 | +0.3 -0.6 | +0.3 -0.6 |
| More than 10 40 or less | +/- 0.6 | +/- 0.6 | +/- 0.6 | +/- 0.6 |
| Over 40 50 or less | +/- 0.6 | +/- 0.6 | +/- 1.0 | +1.0 -1.3 |
| Over 50 Up to 75 | +1.0 -1.3 | +1.0 -1.3 | +/- 1.3 | +1.3 -1.6 |
| Over 75 and 100 or less | +/- 1.3 | +/- 1.3 | +1.3 -1.6 | ±1.6 |
| Over 100 | +1.3 -1.6 | +/- 2.0 | +2.0 -2.3 | +2.0 -2.6 |
Timing belt structure
G type / GB type
*GB (bareback) type: Minimal rubber powder scattering enables clean operation.
Features and compatible conditions based on structure
- Widely used for industrial applications.
- Can also be used for high loads.
- The standard belt can be used within a temperature range of -30°C to +80°C. If heat resistance up to 100°C is required, please use a heat resistant belt.
- The standard belt has conductivity. (Electrical resistance: 6 MΩ or less)
- To prevent belt misalignment, the tension member alternates between S twist and Z twist.
Timing Belt System Table
Timing Belt System Table
S2M Standard Transmission Capacity Table
S2M Allowable Torque Table
Specifications Table
| Belt nominal length | Number of teeth | Belt pitch circumference (mm) | Manufacturability | |
|---|---|---|---|---|
| GB | U | |||
| S2M 66 | 33 | 66 | Yes | - |
| S2M 72 | 36 | 72 | Yes | - |
| S2M 74 | 37 | 74 | Yes | - |
| S2M 76 | 38 | 76 | Yes | - |
| S2M 78 | 39 | 78 | Yes | - |
| S2M 80 | 40 | 80 | Yes | Yes |
| S2M 84 | 42 | 84 | Yes | - |
| S2M 86 | 43 | 86 | Yes | - |
| S2M 88 | 44 | 88 | Yes | - |
| S2M 90 | 45 | 90 | Yes | Yes |
| S2M 98 | 49 | 98 | Yes | Yes |
| S2M 100 | 50 | 100 | Yes | Yes |
| S2M 102 | 51 | 102 | Yes | - |
| S2M 104 | 52 | 104 | Yes | - |
| S2M 106 | 53 | 106 | Yes | - |
| S2M 108 | 54 | 108 | Yes | - |
| S2M 110 | 55 | 110 | Yes | - |
| S2M 112 | 56 | 112 | Yes | Yes |
| S2M 114 | 57 | 114 | Yes | Yes |
| S2M 116 | 58 | 116 | Yes | - |
| S2M 118 | 59 | 118 | Yes | Yes |
| S2M 120 | 60 | 120 | Yes | Yes |
| S2M 122 | 61 | 122 | Yes | Yes |
| S2M 124 | 62 | 124 | Yes | - |
| S2M 126 | 63 | 126 | Yes | Yes |
| S2M 128 | 64 | 128 | Yes | - |
| S2M 130 | 65 | 130 | Yes | Yes |
| S2M 132 | 66 | 132 | Yes | - |
| S2M 134 | 67 | 134 | Yes | - |
| S2M 136 | 68 | 136 | Yes | - |
| S2M 138 | 69 | 138 | Yes | Yes |
| S2M 140 | 70 | 140 | Yes | Yes |
| S2M 142 | 71 | 142 | Yes | - |
| S2M 144 | 72 | 144 | Yes | Yes |
| S2M 146 | 73 | 146 | Yes | - |
| S2M 148 | 74 | 148 | Yes | - |
| S2M 150 | 75 | 150 | Yes | - |
| S2M 152 | 76 | 152 | Yes | Yes |
| S2M 156 | 78 | 156 | Yes | - |
| S2M 158 | 79 | 158 | Yes | Yes |
| S2M 160 | 80 | 160 | Yes | Yes |
| S2M 164 | 82 | 164 | Yes | Yes |
| S2M 166 | 83 | 166 | Yes | Yes |
| S2M 168 | 84 | 168 | Yes | - |
| S2M 170 | 85 | 170 | Yes | - |
| S2M 172 | 86 | 172 | Yes | Yes |
| S2M 174 | 87 | 174 | Yes | - |
| S2M 176 | 88 | 176 | Yes | - |
| S2M 178 | 89 | 178 | Yes | - |
| S2M 180 | 90 | 180 | Yes | - |
| Belt nominal length | Number of teeth | Belt pitch circumference (mm) | Manufacturability | |
|---|---|---|---|---|
| GB | U | |||
| S2M 182 | 91 | 182 | Yes | - |
| S2M 184 | 92 | 184 | Yes | - |
| S2M 186 | 93 | 186 | Yes | - |
| S2M 188 | 94 | 188 | Yes | - |
| S2M 190 | 95 | 190 | Yes | Yes |
| S2M 192 | 96 | 192 | Yes | - |
| S2M 194 | 97 | 194 | Yes | Yes |
| S2M 196 | 98 | 196 | Yes | - |
| S2M 198 | 99 | 198 | Yes | - |
| S2M 200 | 100 | 200 | Yes | Yes |
| S2M 202 | 101 | 202 | Yes | - |
| S2M 204 | 102 | 204 | Yes | - |
| S2M 206 | 103 | 206 | Yes | - |
| S2M 208 | 104 | 208 | Yes | - |
| S2M 210 | 105 | 210 | Yes | Yes |
| S2M 212 | 106 | 212 | Yes | Yes |
| S2M 214 | 107 | 214 | Yes | - |
| S2M 216 | 108 | 216 | Yes | - |
| S2M 218 | 109 | 218 | - | Yes |
| S2M 220 | 110 | 220 | Yes | Yes |
| S2M 224 | 112 | 224 | Yes | Yes |
| S2M 226 | 113 | 226 | Yes | - |
| S2M 230 | 115 | 230 | Yes | Yes |
| S2M 232 | 116 | 232 | Yes | - |
| S2M 234 | 117 | 234 | Yes | - |
| S2M 236 | 118 | 236 | Yes | Yes |
| S2M 238 | 119 | 238 | Yes | - |
| S2M 240 | 120 | 240 | Yes | Yes |
| S2M 242 | 121 | 242 | - | Yes |
| S2M 244 | 122 | 244 | Yes | Yes |
| S2M 246 | 123 | 246 | Yes | Yes |
| S2M 248 | 124 | 248 | Yes | - |
| S2M 250 | 125 | 250 | Yes | Yes |
| S2M 252 | 126 | 252 | Yes | - |
| S2M 254 | 127 | 254 | Yes | - |
| S2M 256 | 128 | 256 | Yes | - |
| S2M 258 | 129 | 258 | Yes | - |
| S2M 260 | 130 | 260 | Yes | Yes |
| S2M 262 | 131 | 262 | Yes | - |
| S2M 264 | 132 | 264 | Yes | - |
| S2M 266 | 133 | 266 | Yes | - |
| S2M 268 | 134 | 268 | Yes | - |
| S2M 270 | 135 | 270 | Yes | - |
| S2M 272 | 136 | 272 | Yes | - |
| S2M 276 | 138 | 276 | Yes | - |
| S2M 278 | 139 | 278 | Yes | - |
| S2M 280 | 140 | 280 | Yes | Yes |
| S2M 284 | 142 | 284 | Yes | - |
| S2M 286 | 143 | 286 | Yes | - |
| S2M 288 | 144 | 288 | Yes | - |
| Belt nominal length | Number of teeth | Belt pitch circumference (mm) | Manufacturability | |
|---|---|---|---|---|
| GB | U | |||
| S2M 290 | 145 | 290 | Yes | Yes |
| S2M 292 | 146 | 292 | Yes | - |
| S2M 296 | 148 | 296 | Yes | - |
| S2M 300 | 150 | 300 | Yes | - |
| S2M 302 | 151 | 302 | Yes | - |
| S2M 304 | 152 | 304 | Yes | - |
| S2M 306 | 153 | 306 | Yes | - |
| S2M 308 | 154 | 308 | Yes | - |
| S2M 310 | 155 | 310 | Yes | - |
| S2M 312 | 156 | 312 | Yes | - |
| S2M 316 | 158 | 316 | Yes | - |
| S2M 318 | 159 | 318 | Yes | - |
| S2M 320 | 160 | 320 | Yes | Yes |
| S2M 322 | 161 | 322 | Yes | - |
| S2M 324 | 162 | 324 | Yes | - |
| S2M 326 | 163 | 326 | Yes | - |
| S2M 328 | 164 | 328 | Yes | - |
| S2M 330 | 165 | 330 | Yes | Yes |
| S2M 334 | 167 | 334 | Yes | - |
| S2M 338 | 169 | 338 | Yes | - |
| S2M 340 | 170 | 340 | Yes | - |
| S2M 342 | 171 | 342 | Yes | - |
| S2M 344 | 172 | 344 | Yes | - |
| S2M 350 | 175 | 350 | Yes | - |
| S2M 354 | 177 | 354 | Yes | - |
| S2M 360 | 180 | 360 | Yes | Yes |
| S2M 364 | 182 | 364 | Yes | - |
| S2M 370 | 185 | 370 | Yes | Yes |
| S2M 372 | 186 | 372 | Yes | - |
| S2M 374 | 187 | 374 | Yes | - |
| S2M 376 | 188 | 376 | Yes | - |
| S2M 380 | 190 | 380 | Yes | - |
| S2M 386 | 193 | 386 | Yes | - |
| S2M 390 | 195 | 390 | Yes | - |
| S2M 396 | 198 | 396 | Yes | Yes |
| S2M 400 | 200 | 400 | Yes | - |
| S2M 402 | 201 | 402 | Yes | - |
| S2M 408 | 204 | 408 | Yes | - |
| S2M 410 | 205 | 410 | Yes | - |
| S2M 420 | 210 | 420 | Yes | - |
| S2M 426 | 213 | 426 | Yes | - |
| S2M 430 | 215 | 430 | Yes | - |
| S2M 434 | 217 | 434 | Yes | - |
| S2M 436 | 218 | 436 | Yes | Yes |
| S2M 438 | 219 | 438 | Yes | - |
| S2M 440 | 220 | 440 | Yes | - |
| S2M 442 | 221 | 442 | Yes | - |
| S2M 444 | 222 | 444 | Yes | - |
| S2M 448 | 224 | 448 | Yes | Yes |
| S2M 452 | 226 | 452 | Yes | - |
| S2M 456 | 228 | 456 | Yes | - |
| S2M 460 | 230 | 460 | Yes | - |
| S2M 464 | 232 | 464 | Yes | - |
| S2M 468 | 234 | 468 | Yes | - |
| S2M 474 | 237 | 474 | Yes | - |
| S2M 476 | 238 | 476 | Yes | - |
| S2M 480 | 240 | 480 | Yes | - |
| S2M 486 | 243 | 486 | Yes | Yes |
| S2M 488 | 244 | 488 | - | Yes |
| S2M 494 | 247 | 494 | Yes | - |
| S2M 500 | 250 | 500 | Yes | - |
| S2M 520 | 260 | 520 | Yes | Yes |
| S2M 524 | 262 | 524 | Yes | - |
| Belt nominal length | Number of teeth | Belt pitch circumference (mm) | Manufacturability | |
|---|---|---|---|---|
| GB | U | |||
| S2M 530 | 265 | 530 | Yes | - |
| S2M 550 | 275 | 550 | Yes | - |
| S2M 560 | 280 | 560 | Yes | Yes |
| S2M 572 | 286 | 572 | Yes | Yes |
| S2M 580 | 290 | 580 | - | Yes |
| S2M 586 | 293 | 586 | Yes | - |
| S2M 594 | 297 | 594 | Yes | - |
| S2M 600 | 300 | 600 | Yes | - |
| S2M 630 | 315 | 630 | Yes | Yes |
| S2M 638 | 319 | 638 | Yes | - |
| S2M 648 | 324 | 648 | Yes | - |
| S2M 656 | 328 | 656 | Yes | - |
| S2M 660 | 330 | 660 | Yes | - |
| S2M 672 | 336 | 672 | Yes | - |
| S2M 676 | 338 | 676 | Yes | - |
| S2M 694 | 347 | 694 | Yes | - |
| S2M 710 | 355 | 710 | Yes | - |
| S2M 726 | 363 | 726 | Yes | - |
| S2M 740 | 370 | 740 | Yes | - |
| S2M 752 | 376 | 752 | Yes | - |
| S2M 772 | 386 | 772 | Yes | - |
| S2M 778 | 389 | 778 | Yes | - |
| S2M 796 | 398 | 796 | Yes | - |
| S2M 800 | 400 | 800 | Yes | - |
| S2M 810 | 405 | 810 | Yes | - |
| S2M 822 | 411 | 822 | Yes | - |
| S2M 826 | 413 | 826 | Yes | - |
| S2M 828 | 414 | 828 | Yes | - |
| S2M 848 | 424 | 848 | Yes | - |
| S2M 856 | 428 | 856 | Yes | - |
| S2M 862 | 431 | 862 | Yes | - |
| S2M 866 | 433 | 866 | Yes | - |
| S2M 880 | 440 | 880 | Yes | - |
| S2M 882 | 441 | 882 | Yes | - |
| S2M 898 | 449 | 898 | Yes | - |
| S2M 900 | 450 | 900 | Yes | - |
| S2M 910 | 455 | 910 | Yes | - |
| S2M 930 | 465 | 930 | Yes | - |
| S2M 944 | 472 | 944 | Yes | - |
| S2M 950 | 475 | 950 | Yes | - |
| S2M 976 | 488 | 976 | Yes | - |
| S2M 984 | 492 | 984 | Yes | Yes |
| S2M 1016 | 508 | 1,016 | Yes | - |
| S2M 1032 | 516 | 1,032 | - | Yes |
| S2M 1062 | 531 | 1,062 | Yes | - |
| S2M 1064 | 532 | 1,064 | Yes | - |
| S2M 1066 | 533 | 1,066 | Yes | - |
| S2M 1100 | 550 | 1,100 | Yes | - |
| S2M 1136 | 568 | 1,136 | Yes | - |
| S2M 1140 | 570 | 1,140 | Yes | - |
| S2M 1148 | 574 | 1,148 | Yes | - |
| S2M 1196 | 598 | 1,196 | Yes | Yes |
| S2M 1224 | 612 | 1,224 | Yes | - |
| S2M 1250 | 625 | 1,250 | Yes | Yes |
| S2M 1274 | 637 | 1,274 | Yes | - |
| S2M 1290 | 645 | 1,290 | Yes | - |
| S2M 1330 | 665 | 1,330 | Yes | - |
| S2M 1420 | 710 | 1,420 | Yes | - |
| S2M 1516 | 758 | 1,516 | Yes | - |
| S2M 1524 | 762 | 1,524 | Yes | - |
| S2M 1878 | 939 | 1,878 | Yes | - |
| S2M 2130 | 1,065 | 2,130 | Yes | - |
Usage Example
Installation of the belt
1. Turn off the power to the machine
2. Check that they are on the same plane
Adjust the X dimension so that it is as close to 0 (zero) as possible. Place a straight edge against the side of the pulley and make sure that the pair of pulleys are on the same plane.
3. Reduce the distance between shafts
Loosen the bolts on the slide base or similar parts, and reduce the distance between shafts until the belt can be installed without force.
4. Apply tension to the belt
Align the teeth of the belt with the grooves of the pulley, and slowly pull the slide base or similar parts to apply tension to the belt. Because the belt is slightly shorter when there is no tension, the belt and pulley may not be fully engaged on pulleys with a large number of teeth. Slowly pull to ensure there are no areas where the belt and pulley are not properly meshed.
5. Pull the belt to the specified tension
Tension the belt so that the deflection load when pressing the center of the belt span (the part of the belt not in contact with the pulley) by a specified amount (16/1000 of the span length) matches the value calculated by the above formula.
6. Alignment Readjustment
With the belt tensioned, use a straight edge again to check the alignment. If there is any misalignment, remove the belt and readjust.
Especially in cases with a bearing on only one side, the shaft may deflect during operation, causing the belt to shift toward the side opposite the bearing. In this case, please adjust the parallelism of the shaft in advance by the amount of deflection.
7. Secure the slide base and other components firmly to prevent any movement.
8. Engagement check
- Slowly rotate the pulley and make sure that the belt and pulley are properly engaged. If the belt does not mesh properly, please check the following.
- Excessive belt tension or looseness
- Abnormal pulley outer diameter: The outer diameter has become smaller due to wear, etc.
- The shape of the pulley does not match the shape of the belt.
Tension pulley mounting method
1. Usage conditions for the tension pulley
Use the tension pulley only in cases where it is functionally unavoidable as described below.
· When used with fixed shaft spacing
If tension adjustment cannot be made by changing the distance between shafts, add a tension pulley to adjust the tension.
· When the gear ratio is large and you want to increase the number of engaged teeth on the small pulley
If the gear ratio is large and the number of engaged teeth on the small pulley becomes too low, add a tension pulley to increase the number of engaged teeth.
2. Tension pulley mounting
Adjust the alignment of the tension pulley accurately. Also, attach it to the slack side during operation.
· Inner tension pulley
When using a tension pulley from the inside, use a pulley diameter equal to or greater than the minimum pulley diameter specified in the catalog.
- For an inside tension pulley, position it on the slack side close to the larger pulley.
- For the tension pulley, use a toothed pulley.
· Outside tension pulley
When using a tension pulley on the outside, use a pulley diameter at least 20% larger than the minimum pulley diameter specified in the catalog.
- If a tension pulley is used on the outside, position it on the slack side close to the smaller pulley.
- Bending angle of the belt should be at least 140°.
- Please use a flat pulley without a crowned surface for the tension pulley.
- Avoid using an outside idler on urethane belts.
Belt Replacement Timing for Timing Belts
Tooth rubber / tooth tip / tooth fabric (reinforcing fabric) / tooth root surface / tooth surface / core wire
When the tooth fabric is worn and the rubber or core wire is exposed / when cracks appear in the back rubber of the belt due to increased hardness, etc. / when crazing occurs at the tooth root of the belt / when the side of the belt is damaged due to wear / tooth breakage / back wear / core wire breakage
Cautions and Prohibitions
Items to Check During Test Operation
Please perform a test run of the belt for several minutes and check the following items. If the following phenomena occur, please take appropriate measures.
Never bring your hands or body close to the pulley or belt while operating. Also, always make sure the belt has come to a complete stop and turn off the power before performing inspections or maintenance.
- 1.Check that the belt is not riding up onto the pulley flange.
(Countermeasure) Adjust the alignment of the pulley. - 2.Check that the belt is not vibrating excessively.
(Countermeasure) Change the initial belt tension (installation tension), or install an additional pulley (flat pulley) to gently press the back of the belt. - 3.Check if belt jumping (a phenomenon where the belt tooth skips over the pulley tooth) is occurring.
(Countermeasure) Increase the initial belt tension (mounting tension). If jumping still occurs even when the belt is tightened, it is possible that a force exceeding the allowable transmission is being applied to the belt, so please review the design again. - 4.Check that the belt tension does not decrease abnormally.
(Countermeasure) Make sure that the slide base and similar components are not loose. It is also possible that the belt was not properly engaged during mounting, so please re-tension the belt.
Guide for daily maintenance
For daily maintenance of the belt, please pay attention to the following items.
- 1.Check that the belt mounting tension has not dropped significantly.
The belt mounting tension may decrease slightly after several hours of operation as the pulley settles in. After installation, rotate the belt about 10 times to allow it to settle, then tension it to the specified value. No retensioning is required afterward. If the timing belt is retensioned, it may not mesh properly and the belt lifespan may be shortened. - 2.Check that there are no cracks on the back of the belt.
- 3.Check that there are no cracks at the tooth root of the belt.
- 4.Check that the fabric at the tooth root area between the teeth of the belt is not worn, exposing the rubber layer or core wire.
- 5.Check that there is no wear or damage on the end face of the belt caused by rubbing against the flange.
- 6.Check that the belt is not significantly meandering during operation.
The belt may move within the pulley during forward or reverse rotating operation, but this is not abnormal. - 7.Check that there is no water or oil adhering to the belt.
- 8.Check that the foundation is not loose.
- 9.Check that there is no rust on the tooth surface or flange of the pulley.
- 10.Is the noise level higher than usual?
Please check all of the above during inspection.