30203 Tapered Roller Bearing (Taper Roller Bearing), ISO 355

For a 17 mm shaft and a 40 mm housing bore, the 30203 tapered roller bearing (ISO 355) is 13.25 mm wide. Modeled as simplified STEP files.

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

• Also searched as: 30203 bearing
• Model id: iso355-30203
• Standard: ISO 355 · size 30203

Files

Part key	Simplified
iso355-30203	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Bore diameter		17		17	nominal	L1
D	Outside diameter		40		40	nominal	L1
T	Total width		13.25		13.25	nominal	L1
B	Cone width		12		12	nominal	L1
C	Cup width		11		11	nominal	L1
r1	Cone back face chamfer dimension	1			1	single limit (min), modeled at the limit	L1
r3	Cup back face chamfer dimension	1			1	single limit (min), modeled at the limit	L1
d1	Cone back face rib diameter		29 ref		29	reference value	L0 (ref: one source)
Y	Axial load factor		1.74		1.74	nominal	L1
alpha	Cup half angle		12.95		12.95	nominal	L0 (nom: one source)

Drawing

As a PDF: CC-ISO355-SZ-30203.pdf.

The 30203 tapered roller bearing beside the 30202 and the 32004X

The 30203 is number 2 of the 16 ISO 355 tapered roller bearings published here, listed from 30202 to 30210.

• Bore diameter (d): 17 mm on the 30203 tapered roller bearing, against 15 mm on the 30202 and 20 mm on the 32004X.
• Outside diameter (D): 40 mm on the 30203 tapered roller bearing, against 35 mm on the 30202 and 42 mm on the 32004X.
• Total width (T): 13.25 mm on the 30203 tapered roller bearing, against 11.75 mm on the 30202 and 15 mm on the 32004X.
• Cone width (B): 12 mm on the 30203 tapered roller bearing, against 11 mm on the 30202 and 15 mm on the 32004X.
• Cup width (C): 11 mm on the 30203 tapered roller bearing, against 10 mm on the 30202 and 12 mm on the 32004X.
• Cone back face chamfer dimension (r1): at least 1 mm on the 30203 tapered roller bearing, against at least 0.6 mm on the 30202 and at least 0.6 mm on the 32004X.
• Cup back face chamfer dimension (r3): at least 1 mm on the 30203 tapered roller bearing, against at least 0.6 mm on the 30202 and at least 0.6 mm on the 32004X.
• Cone back face rib diameter (d1): 29 mm (reference) on the 30203 tapered roller bearing, against 25.6 mm (reference) on the 30202 and 32.1 mm (reference) on the 32004X.

Other sizes

• One size smaller: 30202 Tapered Roller Bearing (Taper Roller Bearing), ISO 355, 15 mm bore, 35 mm OD, 11.75 mm wide.
• One size larger: 32004X Tapered Roller Bearing (Taper Roller Bearing), ISO 355, 20 mm bore, 42 mm OD, 15 mm wide.

Documents

• CC-ISO355-DS-30203.pdf: 30203 datasheet: values with levels, sources
• CC-ISO355-SZ-30203.pdf: 30203 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

nsk-tapered, ntn-bearingfinder-tapered, rule-iso355-cup-angle, skf-17000-tapered, timken-tapered. Full citations: the method page and this size's datasheet.

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