dfh.fm
MR85-ZZ Bearings
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10-pack of MR85-ZZ miniature shielded ball bearings. These are the compact 5 mm ID × 8 mm OD × 2.5 mm width deep-groove bearings used anywhere a small 5 mm shaft needs low-friction support in a tight printed assembly.
Why use MR85-ZZ here
- Correct miniature size: MR85-ZZ / MR85ZZ format, also cross-referenced as L850ZZ or R-850ZZ by bearing suppliers.
- Metal shields on both sides: ZZ shields help keep dust and printed-plastic debris out while staying lower-drag than contact rubber seals.
- Chrome-steel construction: supplier datasheets list SAE 52100 chrome-steel rings and balls with a pressed-steel cage.
- Pre-lubricated: ready to install for light-duty printer, robotics, and hobby motion assemblies.
Specifications
- Quantity: 10 bearings
- Designation: MR85-ZZ / MR85ZZ
- Bore / inner diameter: 5 mm
- Outer diameter: 8 mm
- Width: 2.5 mm
- Closure: metal shielded both sides (ZZ / 2Z)
- Material: SAE 52100 chrome steel rings and balls; pressed-steel cage
- Typical reference speed: 53,000 rpm with adequate lubrication, per SMB Bearings MR85ZZ datasheet
Fitment notes
- Use these when your BOM calls for MR85-ZZ, MR85ZZ, L850ZZ, or R-850ZZ.
- Keep a spare pack with small-format printer builds; the live Voron V0.2r2 Upgrade Kit listing calls out one MR85zz bearing.
- If you are rebuilding leftover ERCF v1/v1.1 hardware, cross-check the bearing callouts against the Rabbit Poop bundle notes before ordering extras.
What it is not
- Not a rubber-sealed 2RS bearing; choose 2RS only where your application needs contact seals over lower drag.
- Not a flanged bearing and not a 623-size bearing. For other miniature bearing formats, compare the bore, OD, and width before substituting.
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
