CC-BRG-MINI-DS-MR128 rev A Size datasheet - MR128
'?) CommunityCAD
MR series MR128 miniature ball bearing
Size datasheet: this bearing's values with their levels, conventions and sources, a row per product as sold.
For 8 mm shafts Part keys bearings- miniature-mr128, bearings - miniature - mr128 - 2z, bearings - miniature - mr128- 2rs Files 3 STEP AP214 (simplified) Built from open MR128 - 2Z MR128ZZ - MR128ZZ, front view, 3:1 MR128ZZ, view from above, 2:1 2RS MR128ZZ 2RS Width as the shielded bearing; sealed row not listed by the sources. Sym. Dimension Value Level d Bore diameter, MR128 8.000 l1 +2 D Outside diameter, MR128 12.000 l1 +2 B Width, MR128 2.500 l1 + 2 r Chamfer dimension r_s min, MR128 > 0.100 l1 +2 d Bore diameter, MR128ZZ 8.000 l1 +2 D Outside diameter, MR128ZZ 12.000 l1 +2 B Width, MR128ZZ 3.500 l1 + 2 r Chamfer dimension r_s min, MR128ZZ > 0.100 l1 +2
Modeled value: nominal, else the midpoint of min-max. =: only that limit is given. * amber: one source (LO). c: a source value was corrected. Level - independent sources.
No published standard: NSK, MinebeaMitsumi and NTN listings Page 1/2 Miniature ball bearing - MR128 - Dimensions in mm - CC-BY 4.0, IronPixel Labs LLC spec 70b2bf787ea8F07904ce030af50bcaf231F0c68F
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.
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* CC-BRG-MINI-DS-MR128 rev A '?) CommunityCAD Size datasheet - MR128
Conventions
e Rings and corners: Bore d, outside diameter D and width B at the nominals of the product's own row; the rings concentric, their faces flush. Ring corners are quarter-rounds of r_s min; the shape isn't specified.
« Ring faces: Each ring's face is (D - d)/8 wide; the annulus between them is the middle half of the radial section.
¢ Shield and seal (2Z, 2RS): A flat annulus recessed r_s min / 2 below the ring faces, the same for both: no groove, snap wire or lip. Each is built from its own row; a 2RS with no sealed row listed takes the shielded row, labelled.
« Open bearing: The annulus recessed B/4 per face, leaving a solid web between the rings. Balls, cage and raceways are not modeled. « Values: d, D and B at their nominals; r at r_s min, the only limit the sources give. * Markings and grades: No markings. Tolerance class, internal clearance and lubricant are not geometry: one model per bearing and product.
Sources Source Publisher Retrieved sha256 nsk-miniature NSK 2026-10-28 Sa2a0c17b82F nmb-miniature MinebeaMitsumi (NMB) 2026-10-29 96Fa41F62F5d
The whole series (verification map, corrections, drawings): CC-BRG-MINI-DS.
No published standard: NSK, MinebeaMitsumi and NTN listings Page 2/2 Miniature ball bearing - MR128 - Dimensions in mm - CC-BY 4.0, IronPixel Labs LLC spec 70b2bf787ea8F07904ce030af50bcaf231F0c68F
Modeled from cited sources; not certified. Found an error? Use the feedback section on the part page.