High Torque Timing Pulleys S8M Type
Caution
- Please note that the swaged flange options, NFC, RFC, and LFC, are not reflected in the CAD data.
- For customers who are selecting timing pulley with tapped holes on the tooth surface. Depending on the shaft bore diameter selected by the customer, the accessory set screw may protrude and interfere with the belt. Please check whether the set screw protrudes from the bottom of the pulley root on the 3D preview or CAD. If it protrudes, please consider alteration SLH "Set screw length change" or changing to shape B. Thank you for choosing this product.
- Please check the content on our website as the PDF does not contain the most up-to-date information.
Product Description
[Material]
· Pulley: Extra super duralumin aluminum alloy, S45C equivalent, SUS304
· Flange: Aluminum alloy, SPCC
[Surface treatment]
· Clear anodize, black anodize, hard clear anodize (firm hardness 300HV~), electroless nickel plating, black iron oxide coating
[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
Tooth groove dimensions slightly vary according to the number of teeth. (Pitch: 8.0mm)
■S8M
● Pulley Shape
Standard Tooth Profile
Shape A
[ ! ]1
[ ! ]2
Shape B
[ ! ]1
[ ! ]2
| mm | Nominal | ||||
| S8M150 | S8M250 | S8M300 | S8M400 | S8M600 | |
| A | 17 | 28 | 33 | 44 | 65 |
| W | 22 | 33 | 38 | 49 | 70 |
| L (Number of Teeth: 18 to 43) | 37 | 48 | 53 | 64 | 85 |
| L (Number of Teeth: 44 to 72) | 42 | 53 | 58 | 69 | 90 |
| dH7 Shaft Bore I.D. | M (Coarse) | Accessory Set Screws | Number of Accessories Included |
| 12 | M4 | M4 × 3 | 2 |
| 13 to 17 | M5 | M5 × 4 | |
| 18 to 30 | M6 | M6 × 5 | |
| 31 to 45 | M8 | M8 × 6 | |
| 46 to 70 | M10 | M10 × 8 |
| Dimension Range | Tolerance (㎜) | |
| Over | or Less | |
| 0.5 | 3 | ±0.1 |
| 3 | 6 | |
| 6 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
(Medium Class).
[ ! ] 1 t = 2.0 for 72 toothed pulleys (Machined Flange)
[ ! ] 2 Shaft Bore Specs. H (Round Hole), V or F (Stepped Hole), Y (Both Sides Stepped Hole) and WB (Two-stepped Hole) do not have tapped holes.
[ ! ] The tolerance of the tap position dimension from the boss end face and pulley end face is ±0.3.
[ ! ] For S8M600, select Shape A: W ≤ d × 5 and Shape B: L ≤ d × 5.
[ ! ] Unless otherwise specified except for teeth and F dimensions, the dimension tolerance conforms to JIS B 0405 Class m.
[ ! ] Compatible with S8M type from Mitsuboshi Belting Ltd. as well as Bando Chemical Industries Ltd.
● Shaft Bore Specification Select shaft bore spec mark and each dim. from the table below. [ ! ] Surface treatment may not be applied to the shaft bores.
| H round hole | P Round Hole + Tap | N New JIS Keyway + Tap C Old JIS Keyway + Tap |
 |  |  |
[ ! ] For A-Shape pulley, the screw holes are |
| V Stepped Hole | F Stepped Hole (Counterbored Hole on the Hub Side) | Y Both Ends Stepped Hole | WB Two-stepped hole |
 |  |  |  |
| [ ! ] Z - d ≥ 2 [ ! ] 3.0 ≤ J ≤ W－3.0 | [ ! ] Applicable to Shape B only [ ! ] Z - d ≥ 2 [ ! ] 3.0 ≤ J ≥ L－3.0 | [ ! ] Applicable to Shape A only [ ! ] Q (R)－Y ≥ 2 [ ! ] S+T ≤ W－3.0 [ ! ] S (T) ≥ 3.0 | [ ! ] Applicable to Shape A only [ ! ] Q－R ≥ 2 [ ! ] R－WB ≥ 2 [ ! ] S+T ≤ W－3.0 [ ! ] S (T) ≥ 3.0 |
| Nominal(N,C) | dH7 |
| 8～10(K) | ＋0.015 0 |
| 11～18 | ＋0.018 0 |
| 19～30 | ＋0.021 0 |
| 31～50 | ＋0.025 0 |
| 51～70 | ＋0.030 0 |
| Nominal(N) | bJS9 | t | ||
| 8～10 | 3 | ±0.0125 | 1.4 | ＋0.1 0 |
| 10K～12 | 4 | ±0.0150 | 1.8 | |
| 13～17 | 5 | 2.3 | ||
| 18～22 | 6 | 2.8 | ||
| 23～30 | 8 | ±0.0180 | 3.3 | ＋0.2 0 |
| 31～38 | 10 | |||
| 39～44 | 12 | ±0.0215 | ||
| 45～50 | 14 | 3.8 | ||
| 55 | 16 | 4.3 | ||
| Nominal(C) | bJS9 | t | ||
| 10～12 | 4 | ＋0.022 ＋0.010 | 1.5 | ＋0.1 0 |
| 15～20 | 5 | 2 | ||
| Shape | Hole | ||||||
| H | P | N(C) | V | F | Y | WB | |
| A | ○ | ○ | ○ | ○ | ‐ | ○ | ○ |
| B | ○ | ○ | ○ | ○ | ○ | ‐ | ‐ |
| Type | Belt Width | [M] Material | [S] Surface Treatment | [A] Accessory Set Screws | |||||
| 15 mm | 25 mm | 30 mm | 40 mm | 60 mm | Pulley | Flange | |||
| S8M150 | S8M250 | S8M300 | S8M400 | S8M600 | |||||
| HTPA | ● | ● | ● | ● | ● | Extra Super Duralumin Aluminum alloy | Aluminum alloy | Clear Anodize | SUS304 |
| HTPB | ● | ● | ● | ● | ● | Black Anodize | |||
| HTPK | ● | ● | ● | ● | ● | Hard Clear Anodize | |||
| HTPN | ● | ● | ● | ● | ● | Electroless nickel plating | |||
| HTPT | ● | ● | ● | ● | ● | S45C Equivalent | SPCC | — | SCM435 (Black Oxide) |
| HTPM | ● | ● | ● | ● | ● | Black Oxide Coating | |||
| HTPP | ● | ● | ● | ● | ● | Electroless nickel plating | |||
| HTPS | ● | ● | ● | — | — | SUS304 | SUS304 | — | SUS304 |
[ ! ] For orders with no flange, please specify the alteration NFC.
[ ! ] Due to vibrations during transportation, the set screw may become detached from the main body.