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The OnlineMetals Guide to Oil-Impregnated Powdered Metals
Powdered Metals are a special class of materials designed to be used in bearings.
Where most of our materials are cast or wrought, powdered metals are first cast, then ground down into powder. This
powder is then combined with oil and a binding agent and compressed under high heat to make a shape, typically round rod
or hollowbar.
The really cool part about this process is that roughly 19% of the volume of the material is SAE 30 weight oil. As a
machine using this bearing comes up to speed and temperature, a fine layer of oil sweats out of the bearing
and coats the shaft, providing self-lubrication. When the machine is turned off and the bearing cools, capillary action
within the bearing acts to absorb the oil back in.
OnlineMetals.com currently stocks two types of oil-impregnated powdered metals in various shapes and sizes:
| SAE 841 |
(available in HollowBar, Plate, Round) |
| SAE 863 |
(available in HollowBar, Round) |
SAE 841 Oil-Impregnated Powdered Metal
| SAE 841 Oil-Impregnated Bronze (Powder Metal) |
| Typical Properties |
% Oil by Volume |
19% minimum |
| "K" Strength Constant |
26,500 |
| Tensile Strength, psi |
14,000 |
| Elongation (% in one inch) |
1 |
| Yield Strength, psi |
11,000 |
| Chemistry |
Copper (Cu) |
87.5 - 90.5% |
| Iron (Fe) |
1% max |
| Carbon (C) |
1.75% max |
| Tin (Sn) |
9.5 - 10.5% |
SAE 863 Oil-Impregnated Powdered Metal
| SAE 863 Oil-Impregnated Iron-Copper (Powdered Metal) |
| Typical Properties |
% Oil by Volume |
19% minimum |
| "K" Strength Constant |
30,000 |
| Tensile Strength, psi |
22,000 |
| Elongation (% in one inch) |
1 |
| Yield Strength, psi |
22,000 |
| Chemistry |
Copper (Cu) |
18 - 22% |
| Iron (Fe) |
Balance |
At OnlineMetals, we all failed shop class. Multiple times. As a matter of fact, our employment applications
specifically ask to see people's grades for their high school shop classes. If they're too high, they go
into the rejected pile. We're also not engineers, and cannot make any specific recommendations about the suitability
of a given alloy, temper, or shape for your project or application.
All technical data is for comparison purposes only and is NOT FOR DESIGN. It has been compiled
from sources we believe to be accurate but cannot guarantee. This ends the part of the website
that our pointy-headed lawyers made us put in.
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