30208 Tapered Roller Bearing (Taper Roller Bearing), ISO 355

For a 40 mm shaft and an 80 mm housing bore, the 30208 tapered roller bearing (ISO 355) is 19.75 mm wide. Modeled as simplified STEP files.

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

• Also searched as: 30208 bearing
• Model id: iso355-30208
• Standard: ISO 355 · size 30208

Files

Part key	Simplified
iso355-30208	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
d	Bore diameter		40		40	nominal	L1
D	Outside diameter		80		80	nominal	L1
T	Total width		19.75		19.75	nominal	L1
B	Cone width		18		18	nominal	L1
C	Cup width		16		16	nominal	L1
r1	Cone back face chamfer dimension	1.5			1.5	single limit (min), modeled at the limit	L1
r3	Cup back face chamfer dimension	1.5			1.5	single limit (min), modeled at the limit	L1
d1	Cone back face rib diameter		57.5 ref		57.5	reference value	L0 (ref: one source)
Y	Axial load factor		1.6		1.6	nominal	L1
alpha	Cup half angle		14.04		14.04	nominal	L0 (nom: one source)

Drawing

As a PDF: CC-ISO355-SZ-30208.pdf.

The 30208 tapered roller bearing beside the 32008X and the 32009X

The 30208 is number 12 of the 16 ISO 355 tapered roller bearings published here, listed from 30202 to 30210.

• Bore diameter (d): 40 mm on the 30208 tapered roller bearing, against 40 mm on the 32008X and 45 mm on the 32009X.
• Outside diameter (D): 80 mm on the 30208 tapered roller bearing, against 68 mm on the 32008X and 75 mm on the 32009X.
• Total width (T): 19.75 mm on the 30208 tapered roller bearing, against 19 mm on the 32008X and 20 mm on the 32009X.
• Cone width (B): 18 mm on the 30208 tapered roller bearing, against 19 mm on the 32008X and 20 mm on the 32009X.
• Cup width (C): 16 mm on the 30208 tapered roller bearing, against 14.5 mm on the 32008X and 15.5 mm on the 32009X.
• Cone back face chamfer dimension (r1): at least 1.5 mm on the 30208 tapered roller bearing, against at least 1 mm on the 32008X and at least 1 mm on the 32009X.
• Cup back face chamfer dimension (r3): at least 1.5 mm on the 30208 tapered roller bearing, against at least 1 mm on the 32008X and at least 1 mm on the 32009X.
• Cone back face rib diameter (d1): 57.5 mm (reference) on the 30208 tapered roller bearing, against 54.7 mm (reference) on the 32008X and 60.7 mm (reference) on the 32009X.

Other sizes

• One size smaller: 32008X Tapered Roller Bearing (Taper Roller Bearing), ISO 355, 40 mm bore, 68 mm OD, 19 mm wide.
• One size larger: 32009X Tapered Roller Bearing (Taper Roller Bearing), ISO 355, 45 mm bore, 75 mm OD, 20 mm wide.

Documents

• CC-ISO355-DS-30208.pdf: 30208 datasheet: values with levels, sources
• CC-ISO355-SZ-30208.pdf: 30208 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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