Keyless High Torque Timing Pulleys - S8M - MechaLock Standard Type Incorporated (with Centering Function)
Caution
- Regarding RoHS compliance: The products are RoHS non-compliant only when alteration BMC is selected. The products are RoHS-compliant when BMC is not selected. As some parts used in the alteration are RoHS non-compliant, the RoHS notation on this page has been changed to non-compliant. "Non-compliant" is also indicated in the certificate due to information on the left.
- Please note that the swaged flange options, NFC, RFC, and LFC, are not reflected in the CAD data.
Product Description
[Material]
· Pulley: Extra super duralumin aluminum alloy, S45C equivalent
· Flange: Aluminum alloy, SPCC
· Bushing: S45C equivalent
[Surface treatment]
· Clear anodize, hard clear anodize (firm hardness 300HV~), electroless nickel plating, black oxide
[Related Products]
· Timing belt High Torque Timing Belt, Super High Torque Timing Belt, Long Timing Belts-Polyurethane, Open End Belts/Polyurethane/Chloroprene Rubber
· Idler Idler with Teeth Center Bearing, Idler with Teeth Both Sides Bearing, Idler - Backside Tensioning Center Bearing, Idler - Backside Tensioning Both Sides Bearing
■Dimensional Tolerances Without Command
| Dimension Range | Tolerance (mm) | |
| Over | or Less | |
| 0.5 | 3 | ±0.1 |
| 3 | 6 | ±0.1 |
| 6 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
| 120 | 400 | ±0.5 |
[ ! ] Surface treatment may not be applied to the shaft bores.
[ ! ] Machined flange for 72 toothed pulleys.
[ ! ] Flange is installed.
[ ! ] For orders with no flange, please specify the alteration NFC.
[ ! ] Compatible with S8M type from Mitsuboshi Belting Ltd. as well as Bando Chemical Industries Ltd.
[ ! ] Unless otherwise specified except for teeth and F dimensions, the dimension tolerance conforms to JIS B 0405 Class m.
Table 1: Select Shaft Bore Dia.
| dH7 | Max. allowable torque (N⋅m) | D1 | (L) | ||
| HHTA·HHTK HHTN・HHTT HHTM | HHTP | HHTAS | |||
| 12 | 44.1 | 36.2 | 24.5 | 28.5 | 6.5 |
| 14 | 63.7 | 50.9 | 28.4 | 30.5 | |
| 15 | 80.4 | 54.8 | 30.4 | 31.5 | |
| 16 | 83.3 | 58.8 | — | 33.0 | |
| 17 | 92.2 | 76.4 | — | 33.5 | |
| 18 | 95.1 | 80.3 | — | 34.5 | |
| 19 | 98.1 | 85.2 | — | 35.5 | |
| 20 | 216.0 | 183.0 | 122 | 42.0 | 8 |
| 22 | 255.0 | 201.0 | — | 44.0 | |
| 24 | 363.0 | 252.0 | — | 46.0 | |
| 25 | 392.0 | 264.0 | 153 | 47.0 | |
| 28 | 441.0 | 295.0 | — | 50.0 | 8.5 |
| 30 | 500.0 | 396.0 | 230 | 52.0 | |
| 32 | 530.0 | 423.0 | — | 54.0 | |
| 35 | 883.0 | 548.0 | — | 62.0 | 10 |
| 40 | 1079.0 | 779.0 | — | 67.0 | |
| 45 | 1285.0 | 882.0 | — | 72.0 | |
| 50 | 1706.0 | 1362.0 | — | 77.0 | 10.5 |
■List of MechaLocks by part number
| HHTA | HHTK | HHTN | HHTAS | HHTT | HHTM | HHTP |
| MLM | MLHS | MLM | MLMB | MLMP | ||
Table 2: pulley through hole combination
| Nominal Width | MechaLock inner dia. dH7 |
| S8M150 | 20·22 |
■Belt Nominal Width / Dimensions
| mm | Nominal | |||
| S8M150 | S8M250 | S8M300 | S8M400 | |
| A | 17 | 28 | 33 | 44 |
| W | 22 | 33 | 38 | 49 |
| Y | − | 22(up to d22) 24(d24 to 30) 24.5(d32 or more) | 24(up to d22) 25(d24 to 32) 28(d35 or more) | 30(up to d22) 31(d24 to 32) 34(d35 or more) |
■Mechalock bolt tightening torque
(N⋅m)
| type | MLM | MLMB | MLMP | MLHS |
| d | ||||
| 6 | 3.9 | 3.2 | 3.9 | 2.7 |
| 8 | ||||
| 10 | ||||
| 12 | ||||
| 14 | ||||
| 15 | ||||
| 16 | ||||
| 17 | ||||
| 18 | ||||
| 19 | ||||
| 20 | 8.8 | 7.5 | 8.8 | 5.6 |
| 22 | ||||
| 24 | ||||
| 25 | ||||
| 28 | ||||
| 30 | ||||
| 32 | ||||
| 35 | 15.7 | 12.7 | 15.7 | 9.6 |
| 38 | ||||
| 40 | ||||
| 42 | ||||
| 45 | ||||
| 48 | ||||
| 50 |
| Type | Part number | [M]Material*1 | [S] Surface Treatment | |||||||
| Belt width: 15 mm | Belt width: 25 mm | Belt width: 30 mm | Belt width: 40 mm | Pulley | Flange | MechaLock | Pulley | Flange | MechaLock | |
| S8M150 | S8M250 | S8M300 | S8M400 | |||||||
| HHTA | ● | ● | ● | ● | Extra Super Duralumin Aluminum alloy | Aluminum alloy | S45C Equivalent | Clear Anodize | — | |
| HHTK | ● | ● | ● | ● | Hard Clear Anodized *2 | — | ||||
| HHTN | ● | ● | ● | ● | Electroless nickel plating | — | ||||
| HHTAS | ● | ● | ● | ● | SUS304 Equivalent | Clear Anodize | — | |||
| HHTT | ● | ● | ● | ● | S45C equivalent | SPCC | S45C Equivalent | — | ||
| HHTM | ● | ● | ● | ● | Black Oxide Coating | |||||
| HHTP | ● | ● | ● | ● | Electroless nickel plating | |||||
*2 Hard clear anodize: film hardness 300 HV or more