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Boston Gear 30224880 M57-8 Bear-N-Bronz plain sleeve bearing. This bronze bushing is designed for general industrial applications requiring a durable, self-lubricating bearing surface. The M57-8 size provides a precise fit for shaft support in low-speed, moderate-load environments.
MODEL M57-8
Contact supplier for technical support on: 800-626-2120
$28.07 Each
Prices are subject to change
FREE SHIPPING ON ORDERS OVER $100
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Typically Ships in: 1 day
Returnable: See conditions
Bear-N-Bronz is Boston Gear general purpose, cast, solid bronze bearing material. It is a high grade, leaded tin bronze, having good hardness, strength, wear-resistance and exceptional anti-friction qualities. It is particularly suited for moderate to heavy loads at normal to relatively high speeds. All parts are rigidly inspected to assure freedom from porosity and conformance to dimensional tolerances. In addition, our standard product offering, the Bear-N-Bronz material can be provided in different sizes, bar lengths (up to 105"), and with oil grooves.
| Product Family | Bear-N-Bronz |
|---|---|
| Weight | 0.021 |
| Product Description | Bearing, Plain, Cylindrical, 660 Cast Bronze |
| Altra Master No. | 30224880 |
| Inside Diameter | 0.312500 |
| Upc | 781711313282 |
| Max Pv Value | 75, 000 |
| Family Id | 30, 071 |
| Length | 1.000000 |
| Outside Diameter | 0.4375 |
| Max P Value | 3, 000 |
| Max V Value (fpm) | 750 |
| Unit Of Measure | English |
SKU: 42637
Shaft output is reversible
Description should say that shaft is reversible. Other than that perfect fit. Good communication from the shipping folks.
Read moreSKU: 38404
Boston gear order
MRO had the items that I needed. I ordered them and they were shipped faster than I expected. It was a pleasant experience all around.
Read moreSKU: 6132994
Speed reducer purchase
The purchase was easy it did take two purchase until we got the correct part I guess it was a fault on both parts as we were looking at the wrong part number, but overall the purchase was good part fit perfectly. Thanks for your support.
Read moreSKU: 38771
Gear box oil
This has been very hard to find. It’s the oil spec’ed for my 1950s Rockwell wedge bed planer gear box. I haven’t found it anyplace else.
Read moreHow do I choose the right type of bearing for my application?
Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.
SKU: 42637
Shaft output is reversible
Description should say that shaft is reversible. Other than that perfect fit. Good communication from the shipping folks.
Read moreSKU: 38404
Boston gear order
MRO had the items that I needed. I ordered them and they were shipped faster than I expected. It was a pleasant experience all around.
Read moreSKU: 6132994
Speed reducer purchase
The purchase was easy it did take two purchase until we got the correct part I guess it was a fault on both parts as we were looking at the wrong part number, but overall the purchase was good part fit perfectly. Thanks for your support.
Read moreSKU: 38771
Gear box oil
This has been very hard to find. It’s the oil spec’ed for my 1950s Rockwell wedge bed planer gear box. I haven’t found it anyplace else.
Read moreItem must be unused.
Item must be in it's original package.
25% Restocking, shipping and handling fees may apply to any return with this manufacturer.
For more information please consult https://www.mrosupply.com/page/returnwarranty-policy/