MR84 Miniature Ball Bearing (MR Bearing), MR series

The MR84 miniature ball bearing (MR series) has a 4 mm bore, an 8 mm outside diameter and a width of 2 mm. Get it as simplified STEP files.

How these parts are made, and what the levels mean: read the method

• Also searched as: MR84 bearing
• Model id: bearings-miniature-mr84
• Standard: MR series · size MR84

Files

Part key	Simplified
bearings-miniature-mr84	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Bore diameter		4		4	nominal	L1
D	Outside diameter		8		8	nominal	L1
B	Width		2		2	nominal	L1
r	Chamfer dimension	0.1			0.1	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-BRG-MINI-SZ-MR84.pdf.

The MR84 miniature ball bearing beside the MR74 and the MR104

The MR84 is number 3, counting from the smallest, of the 12 MR series miniature ball bearings published here, from MR63 to MR148.

• Bore diameter (d): 4 mm on the MR84 miniature ball bearing, the same on the MR74 and the MR104.
• Outside diameter (D): 8 mm on the MR84 miniature ball bearing, against 7 mm on the MR74 and 10 mm on the MR104.
• Width (B): 2 mm on the MR84 miniature ball bearing, against 2 mm on the MR74 and 3 mm on the MR104.
• Chamfer dimension (r): at least 0.1 mm on the MR84 miniature ball bearing, against at least 0.08 mm on the MR74 and at least 0.15 mm on the MR104.

The MR84 miniature ball bearing in its other versions

• MR84-2Z Miniature Ball Bearing (MR Bearing), Shielded, MR series: width 3 mm.
• MR84-2RS Miniature Ball Bearing (MR Bearing), Sealed, MR series: width 3 mm.

Other sizes

• One size smaller: MR74 Miniature Ball Bearing (MR Bearing), MR series, 4 mm bore, 7 mm OD, 2 mm wide.
• One size larger: MR104 Miniature Ball Bearing (MR Bearing), MR series, 4 mm bore, 10 mm OD, 3 mm wide.

Documents

• CC-BRG-MINI-DS-MR84.pdf: MR84 datasheet: values with levels, sources
• CC-BRG-MINI-SZ-MR84.pdf: MR84 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

nmb-miniature, nsk-miniature. Full citations: the method page and this size's datasheet.

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