6903, 6903-2Z, 6903-2RS Ball Bearing, ISO 15

The 6903 ball bearing (ISO 15) has a 17 mm bore, a 30 mm outside diameter and a width of 7 mm. Get it as simplified STEP files.

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

• Also searched as: 6903 bearing, 6903-2Z bearing, 6903-2RS bearing
• Model id: iso15-6903
• Standard: ISO 15 · size 6903

Versions

Designation	What differs	Part key	Simplified
6903	open	iso15-6903	STEP
6903-2Z	2Z (shielded)	iso15-6903-2z	STEP
6903-2RS	2RS (sealed)	iso15-6903-2rs	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Bore diameter		17		17	nominal	L1
D	Outside diameter		30		30	nominal	L1
B	Width		7		7	nominal	L1
r	Chamfer dimension	0.3			0.3	single limit (min), modeled at the limit	L1

Drawing

As a PDF: CC-ISO15-SZ-6903.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: 5050 N
• Basic Load Ratings, C0r: 2550 N
• Limiting Speeds, Grease: 24000 min-1
• Limiting Speeds, Oil (Oil-bath): 28000 min-1

The 6903 ball bearing beside the 6803 and the 16003

The 6903 is number 43 of the 71 ISO 15 ball bearings published here, listed from 693 to 6306.

• Bore diameter (d): 17 mm on the 6903 ball bearing, the same on the 6803 and the 16003.
• Outside diameter (D): 30 mm on the 6903 ball bearing, against 26 mm on the 6803 and 35 mm on the 16003.
• Width (B): 7 mm on the 6903 ball bearing, against 5 mm on the 6803 and 8 mm on the 16003.
• Chamfer dimension (r): at least 0.3 mm on the 6903 ball bearing, the same on the 6803 and the 16003.

Other sizes

• One size smaller: 6803 Ball Bearing, ISO 15, 17 mm bore, 26 mm OD, 5 mm wide.
• One size larger: 16003 Ball Bearing, ISO 15, 17 mm bore, 35 mm OD, 8 mm wide.

Documents

• CC-ISO15-DS-6903.pdf: 6903 datasheet: values with levels, sources
• CC-ISO15-SZ-6903.pdf: 6903 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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