6904, 6904-2Z, 6904-2RS Ball Bearing, ISO 15

The 6904 ball bearing (ISO 15) has a 20 mm bore, a 37 mm outside diameter and a width of 9 mm. Get it as simplified STEP files.

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

• Also searched as: 6904 bearing, 6904-2Z bearing, 6904-2RS bearing
• Model id: iso15-6904
• Standard: ISO 15 · size 6904

Versions

Designation	What differs	Part key	Simplified
6904	open	iso15-6904	STEP
6904-2Z	2Z (shielded)	iso15-6904-2z	STEP
6904-2RS	2RS (sealed)	iso15-6904-2rs	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Bore diameter		20		20	nominal	L1
D	Outside diameter		37		37	nominal	L1
B	Width		9		9	nominal	L1
r	Chamfer dimension	0.3			0.3	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-ISO15-SZ-6904.pdf.

Load ratings and speeds

What NSK's web catalogue (nsk-dgbb) lists for its open bearing of this designation. Limiting speeds are for the open bearing; a shielded or sealed bearing has its own, lower ones.

• Basic Load Ratings, Cr: 7000 N
• Basic Load Ratings, C0r: 3700 N
• Limiting Speeds, Grease: 19000 min-1
• Limiting Speeds, Oil (Oil-bath): 22000 min-1

The 6904 ball bearing beside the 6804 and the 16004

The 6904 is number 49 of the 71 ISO 15 ball bearings published here, listed from 693 to 6306.

• Bore diameter (d): 20 mm on the 6904 ball bearing, the same on the 6804 and the 16004.
• Outside diameter (D): 37 mm on the 6904 ball bearing, against 32 mm on the 6804 and 42 mm on the 16004.
• Width (B): 9 mm on the 6904 ball bearing, against 7 mm on the 6804 and 8 mm on the 16004.
• Chamfer dimension (r): at least 0.3 mm on the 6904 ball bearing, the same on the 6804 and the 16004.

Other sizes

• One size smaller: 6804 Ball Bearing, ISO 15, 20 mm bore, 32 mm OD, 7 mm wide.
• One size larger: 16004 Ball Bearing, ISO 15, 20 mm bore, 42 mm OD, 8 mm wide.

Documents

• CC-ISO15-DS-6904.pdf: 6904 datasheet: values with levels, sources
• CC-ISO15-SZ-6904.pdf: 6904 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

nsk-dgbb, ntn-bearingfinder-dgbb. Full citations: the method page and this size's datasheet.

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