High Torque Timing Pulleys S8M Type
Brand :
MISUMI
Caution
- Please note that the swaged flange options, NFC, RFC, and LFC, are not reflected in the CAD data.
- Please check the content on our website as the PDF does not contain the most up-to-date information.
Product Description
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[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
Dimensional Drawing
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
[ ! ] For aluminum flanges, the flange thickness is 1.5.
[ ! ] 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.
[ ! ] 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 shaft bores.
[ ! ] No standard value is specified for chamfering of d dim.
[ ! ] Surface treatment may not be applied to shaft bores.
[ ! ] No standard value is specified for chamfering of d dim.
| H Round Hole | P Round Hole + Tap | N New JIS Keyway + Tap C Old JIS Keyway + Tap |
 |  |  |
[ ! ] For A-Shape pulley, | [ ! ] Specify NK10 when selecting "New JIS Keywayed Bore" + "Shaft Bore Diameter 10" + "Keyway Width 4.0 mm". [ ! ] The difference between part number N10 and NK10 is the machining dimensions. See the table below, "New JIS Keyway Dimension Tolerance," for details. [ ! ] The position of the keyway and the phase of the teeth are not guaranteed. |
| V Stepped Hole | F Stepped Hole (Counterbored Hole on the Hub Side) | Y Both Ends Stepped Hole | WB Two-stepped Hole |
 |  |  |  |
| [ ! ] Z-V(d) ≥ 2 [ ! ] 3.0 ≤ J ≤ W-3.0 | [ ! ] Applicable to Shape B only [ ! ] Z-F(d) ≥ 2 [ ! ] 3.0 ≤ J ≥ L-3.0 | [ ! ] Applicable to Shape A only [ ! ] Q-Y(d) ≥ 2 [ ! ] R-Y(d) ≥ 2 [ ! ] S+T ≤ W-3.0 [ ! ] S (T) ≥ 3.0 | [ ! ] Applicable to Shape A only [ ! ] Q-R ≥ 2 [ ! ] R-WB(d) ≥ 2 [ ! ] S+T ≤ W-3.0 [ ! ] S (T) ≥ 3.0 |
■Belt Nominal Width / Dimensions
| 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 |
■Tapped Hole Dimensions (Shaft Bore Specs.: P,N,C)
[ ! ] No specification is set for the tightening torque
of the set screw.
| 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 |
of the set screw.
Dimensional tolerances without command
[ ! ] Compliant with JIS B 0405 Class m
(Medium Class).
| Dimension Range | Tolerance (mm) | |
| Over | or Less | |
| 0.5 | 3 | ±0.1 |
| 3 | 6 | |
| 6 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
(Medium Class).
■Keyway Dimension Table
d Dimensional Tolerance (H7)
| Nominal(N,C) | dH7 |
| 8 to 10(K) | ＋0.015 0 |
| 11 to 18 | ＋0.018 0 |
| 19 to 30 | ＋0.021 0 |
| 31 to 50 | ＋0.025 0 |
| 51 to 70 | ＋0.030 0 |
New JIS Keyway Dimension Tolerance
| Nominal(N) | bJS9 | t | ||
| 8 to 10 | 3 | ±0.0125 | 1.4 | ＋0.1 0 |
| 10K to 12 | 4 | ±0.0150 | 1.8 | |
| 13 to 17 | 5 | 2.3 | ||
| 18 to 22 | 6 | 2.8 | ||
| 23 to 30 | 8 | ±0.0180 | 3.3 | ＋0.2 0 |
| 31 to 38 | 10 | |||
| 39 to 44 | 12 | ±0.0215 | ||
| 45 to 50 | 14 | 3.8 | ||
| 55 | 16 | 4.3 | ||
Old JIS Keyway Dimension Tolerance
| Nominal(C) | bJS9 | t | ||
| 10 to 12 | 4 | ＋0.022 ＋0.010 | 1.5 | ＋0.1 0 |
| 15 to 20 | 5 | 2 | ||
■Pulley Shape and Shaft Bore Machining Table
| 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 |
[ ! ] Due to vibrations during transportation, the set screw may become detached from the main body.
[ ! ] For orders with no flange, please specify the alteration NFC.