O-Ring
Product name | O-Rings - P Series |
Part number | NPA32 |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
To transport a workpiece without damaging it
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Available sizes
■O-Rings - P Series
Material | Hardness (JIS Hs) | Color | Operable Temperature Range | JIS Symbol | Usage |
Nitrile Rubber | 70±5 | Black | -30-100℃ | Class 1 A | Mineral Oil Resistant |
90±5 | Black | -25-100℃ | Class 1 B |
Silicon Rubber | 50±5 | Milky White | -50-200℃ | − | Heat Resistant |
70±5 | Navy | -50-200℃ | Class 4 C |
Fluororubber | 70±5 | Black | -15-200℃ | Class 4 D |
90±5 | Black | -15-200℃ | − |
Ethylene Propylene Rubber | 70±5 | Black | -45-130℃ | − | For Weather Resistant Items |
■Sizes and Dimensions (excerpt)
JIS Nominal Number | Ring I.D. | Ring Wire Dia. | Against O-ring of Opposite Side Diameter |
Internal Contact | External Contact |
P22 | φ21.8 | φ2.4 | φ22 | φ26 |
P22A | φ21.7 | φ3.5 | φ22 | φ28 |
P22.4 | φ22.1 | φ22.4 | φ28.4 |
P24 | φ23.7 | φ24 | φ30 |
P25 | φ24.7 | φ25 | φ31 |
P25.5 | φ25.2 | φ25.5 | φ31.5 |
P26 | φ25.7 | φ26 | φ32 |
P28 | φ27.7 | φ28 | φ34 |
P29 | φ28.7 | φ29 | φ35 |
P29.5 | φ29.2 | φ29.5 | φ35.5 |
P30 | φ29.7 | φ30 | φ36 |
P31 | φ30.7 | φ31 | φ37 |
P31.5 | φ31.2 | φ31.5 | φ37.5 |
P32 | φ31.7 | φ32 | φ38 |
P34 | φ33.7 | φ34 | φ40 |
P35 | φ34.7 | φ35 | φ41 |
P35.5 | φ35.2 | φ35.5 | φ41.5 |
P36 | φ35.7 | φ36 | φ42 |
P38 | φ37.7 | φ38 | φ44 |
P39 | φ38.7 | φ39 | φ45 |
P40 | φ39.7 | φ40 | φ46 |
P41 | φ40.7 | φ41 | φ47 |
P42 | φ41.7 | φ42 | φ48 |
P44 | φ43.7 | φ44 | φ50 |
P45 | φ44.7 | φ45 | φ51 |
P46 | φ45.7 | φ46 | φ52 |
P48 | φ47.7 | φ48 | φ54 |
P50 | φ49.7 | φ50 | φ56 |
* Please see the product pages for other diameter rings
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Accuracy Info
Ring Wire DIA. Tolerance:
Wire Dia. | Tolerance |
φ1.9 | ±0.08 |
φ2.4 | ±0.09 |
φ3.5 | ±0.10 |
φ5.7 | ±0.13 |
Parting Surface Burr Height: 0.1 or less
Parting Surface Burr Width: 0.15 or less
Ring I.D. Tolerance;
JIS Nominal Number | Ring I.D. | Tolerance |
Nitrile | Silicone Nitrile | Fluorine |
P22 | φ21.8 | ±0.24 | ±0.36 | ±0.28 |
P22A | φ21.7 |
P22.4 | φ22.1 |
P24 | φ23.7 |
P25 | φ24.7 | ±0.25 | ±0.37 | ±0.30 |
P25.5 | φ25.2 |
P26 | φ25.7 | ±0.26 | ±0.39 | ±0.31 |
P28 | φ27.7 | ±0.28 | ±0.42 | ±0.33 |
P29 | φ28.7 | ±0.29 | ±0.43 | ±0.34 |
P29.5 | φ29.2 |
P30 | φ29.7 |
P31 | φ30.7 | ±0.30 | ±0.45 | ±0.36 |
P31.5 | φ31.2 | ±0.31 | ±0.46 | ±0.37 |
P32 | φ31.7 |
P34 | φ33.7 | ±0.33 | ±0.49 | ±0.39 |
P35 | φ34.7 | ±0.34 | ±0.51 | ±0.40 |
P35.5 | φ35.2 |
P36 | φ35.7 |
P38 | φ37.7 | ±0.37 | ±0.55 | ±0.44 |
P39 | φ38.7 |
P40 | φ39.7 |
P41 | φ40.7 | ±0.38 | ±0.57 | ±0.45 |
P42 | φ41.7 | ±0.39 | ±0.58 | ±0.48 |
P44 | φ43.7 | ±0.41 | ±0.61 | ±0.49 |
P45 | φ44.7 |
P46 | φ45.7 | ±0.42 | ±0.63 | ±0.50 |
P48 | φ47.7 | ±0.44 | ±0.66 | ±0.52 |
P50 | φ49.7 | ±0.45 | ±0.67 | ±0.54 |
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Idler
Product name | Idler Pulleys - Resin, Flat / Flanged |
Part number | TPBSN38-15 |
Features | Can be used as the tension adjuster for timing belts. |
* Orange colored cells in the table below indicate the part numbers used in this example.
Selection criteria
Used for tension adjustment of a timing belt
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Available sizes
■Idler Pulleys - Resin, Flat / Flanged
Body Material | Bearing Material |
Glass Reinforced Nylon (engineered plastic) | Steel |
■Sizes
Nominal Dia. of the Idler | Overall Width | Inner Width | O.D. | Bearing No. to Use | Applicable Idler Shaft |
Flanged | No Flange | Flanged |
φ38 | 18 | 18 | 15 | φ42 | 6200ZZ | WS010S |
φ40 | 26 | 26 | 20 | φ48 | 6201ZZ | WS116S・WS122S |
φ45 | 25 | 25 | φ50 | 6202ZZ | WS216S |
φ46 | φ52 | 6201ZZ | WS112S・WS116S |
φ50 | 31 | 31 | 25 | φ62 | WS116S・WS122S |
φ60 | 36 | − | 30 | φ66 |
φ70 | 35 | − | 28 | φ80 | 6202ZZ | WS216S・WS222S |
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IDEA NOTE Circuit board contact
An O-ring is used on the roller for contacting the sides and edges of the circuit board.
IDEA NOTE Rollers serve as a width guide
The roller attached with the O-ring is flanged and the flange guides the workpiece in the widthwise direction.
IDEA NOTE Idler
Idler presses the belt from the top, creating proper tensioning between belt and pulleys.