steve/tapered-roller-bearing

Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm, as a boundary-dimension envelope.

v1.0.0 STEVE MIT 0

Open in STEVE

Isometric

Parameters

Preset17 sizes

Bearing number17 options

Defaults built

part.py 18 lines · Python · STEVE runtime · checked

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"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm: envelope for assemblies. The cone (inner ring side) of width B and the cup

(outer ring side) of width C share the overall width T: drawn as one solid ring d x D x T. Rollers and cage are not modelled. Axis along Z, centred."""

from steve import Model

designation = "30204" # Bearing number

# number: (d, D, T, B, C). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, boundary dimensions.

BEARINGS = {"30203": (17, 40, 13.25, 12, 11), "30204": (20, 47, 15.25, 14, 12), "30205": (25, 52, 16.25, 15, 13), "30206": (30, 62, 17.25, 16, 14), "30207": (35, 72, 18.25, 17, 15), "30208": (40, 80, 19.75, 18, 16), "30209": (45, 85, 20.75, 19, 16), "30210": (50, 90, 21.75, 20, 17), "30302": (15, 42, 14.25, 13, 11), "30303": (17, 47, 15.25, 14, 12), "30304": (20, 52, 16.25, 16, 13), "30305": (25, 62, 18.25, 17, 15), "30306": (30, 72, 20.75, 19, 16), "30307": (35, 80, 22.75, 21, 18), "30308": (40, 90, 25.25, 23, 20), "30309": (45, 100, 27.25, 25, 22), "30310": (50, 110, 29.25, 27, 23)}

d, D, T, B, C = BEARINGS[designation]

model = Model()

with model.sketch("rings", on="XY", name="Rings") as sk:

sk.circle("outer", (0, 0), D / 2)

sk.circle("bore", (0, 0), d / 2)

model.extrude("body", "rings", distance=T, both=True, name="Bearing")

model.material("steel-generic", color="#b9bdc2")

result = model.result()

"""Tapered roller bearing, 302 and 303 series, bore up to 50 mm: envelope for assemblies. The cone (inner ring side) of width B and the cup
(outer ring side) of width C share the overall width T: drawn as one solid ring d x D x T. Rollers and cage are not modelled. Axis along Z, centred."""
from steve import Model

designation = "30204"  # Bearing number

# number: (d, D, T, B, C). NTN Ball and Roller Bearings CAT. No. 2203-3/E (2024), PDF pages 165-167, boundary dimensions.
BEARINGS = {"30203": (17, 40, 13.25, 12, 11), "30204": (20, 47, 15.25, 14, 12), "30205": (25, 52, 16.25, 15, 13), "30206": (30, 62, 17.25, 16, 14), "30207": (35, 72, 18.25, 17, 15), "30208": (40, 80, 19.75, 18, 16), "30209": (45, 85, 20.75, 19, 16), "30210": (50, 90, 21.75, 20, 17), "30302": (15, 42, 14.25, 13, 11), "30303": (17, 47, 15.25, 14, 12), "30304": (20, 52, 16.25, 16, 13), "30305": (25, 62, 18.25, 17, 15), "30306": (30, 72, 20.75, 19, 16), "30307": (35, 80, 22.75, 21, 18), "30308": (40, 90, 25.25, 23, 20), "30309": (45, 100, 27.25, 25, 22), "30310": (50, 110, 29.25, 27, 23)}

d, D, T, B, C = BEARINGS[designation]
model = Model()
with model.sketch("rings", on="XY", name="Rings") as sk:
    sk.circle("outer", (0, 0), D / 2)
    sk.circle("bore", (0, 0), d / 2)
model.extrude("body", "rings", distance=T, both=True, name="Bearing")
model.material("steel-generic", color="#b9bdc2")
result = model.result()

pypart.toml 134 lines · TOML

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name = "steve/tapered-roller-bearing"

version = "1.0.0"

runtime = "steve"

license = "MIT"

summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm, as a boundary-dimension envelope."

description = """Tapered roller bearing (302 and 303 series) as an envelope for assemblies: one solid d x D x T, the overall width. Rollers and \

cage are not modelled. Axis along Z, centred on the origin. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""

tags = ["bearing", "roller-bearing", "tapered-roller", "iso-355", "metric"]

[parameters.designation]

type = "choice"

default = "30204"

choices = ["30203", "30204", "30205", "30206", "30207", "30208", "30209", "30210", "30302", "30303", "30304", "30305", "30306", "30307", "30308", "30309", "30310"]

label = "Bearing number"

[[presets]]

id = "30203"

title = "30203 (17 × 40 × 13.25)"

params = { designation = "30203" }

aliases = ["30203 bearing", "tapered roller bearing 30203", "4T-30203"]

standard = "ISO 355"

[[presets]]

id = "30204"

title = "30204 (20 × 47 × 15.25)"

params = { designation = "30204" }

aliases = ["30204 bearing", "tapered roller bearing 30204", "4T-30204"]

standard = "ISO 355"

[[presets]]

id = "30205"

title = "30205 (25 × 52 × 16.25)"

params = { designation = "30205" }

aliases = ["30205 bearing", "tapered roller bearing 30205", "4T-30205"]

standard = "ISO 355"

[[presets]]

id = "30206"

title = "30206 (30 × 62 × 17.25)"

params = { designation = "30206" }

aliases = ["30206 bearing", "tapered roller bearing 30206", "4T-30206"]

standard = "ISO 355"

[[presets]]

id = "30207"

title = "30207 (35 × 72 × 18.25)"

params = { designation = "30207" }

aliases = ["30207 bearing", "tapered roller bearing 30207", "4T-30207"]

standard = "ISO 355"

[[presets]]

id = "30208"

title = "30208 (40 × 80 × 19.75)"

params = { designation = "30208" }

aliases = ["30208 bearing", "tapered roller bearing 30208", "4T-30208"]

standard = "ISO 355"

[[presets]]

id = "30209"

title = "30209 (45 × 85 × 20.75)"

params = { designation = "30209" }

aliases = ["30209 bearing", "tapered roller bearing 30209", "4T-30209"]

standard = "ISO 355"

[[presets]]

id = "30210"

title = "30210 (50 × 90 × 21.75)"

params = { designation = "30210" }

aliases = ["30210 bearing", "tapered roller bearing 30210", "4T-30210"]

standard = "ISO 355"

[[presets]]

id = "30302"

title = "30302 (15 × 42 × 14.25)"

params = { designation = "30302" }

aliases = ["30302 bearing", "tapered roller bearing 30302", "4T-30302"]

standard = "ISO 355"

[[presets]]

id = "30303"

title = "30303 (17 × 47 × 15.25)"

params = { designation = "30303" }

aliases = ["30303 bearing", "tapered roller bearing 30303", "4T-30303"]

standard = "ISO 355"

[[presets]]

id = "30304"

title = "30304 (20 × 52 × 16.25)"

params = { designation = "30304" }

aliases = ["30304 bearing", "tapered roller bearing 30304", "4T-30304"]

standard = "ISO 355"

[[presets]]

id = "30305"

title = "30305 (25 × 62 × 18.25)"

params = { designation = "30305" }

aliases = ["30305 bearing", "tapered roller bearing 30305", "4T-30305"]

standard = "ISO 355"

100

[[presets]]

101

id = "30306"

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title = "30306 (30 × 72 × 20.75)"

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params = { designation = "30306" }

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aliases = ["30306 bearing", "tapered roller bearing 30306", "4T-30306"]

105

standard = "ISO 355"

106

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[[presets]]

108

id = "30307"

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title = "30307 (35 × 80 × 22.75)"

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params = { designation = "30307" }

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aliases = ["30307 bearing", "tapered roller bearing 30307", "4T-30307"]

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standard = "ISO 355"

113

114

[[presets]]

115

id = "30308"

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title = "30308 (40 × 90 × 25.25)"

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params = { designation = "30308" }

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aliases = ["30308 bearing", "tapered roller bearing 30308", "4T-30308"]

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standard = "ISO 355"

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[[presets]]

122

id = "30309"

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title = "30309 (45 × 100 × 27.25)"

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params = { designation = "30309" }

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aliases = ["30309 bearing", "tapered roller bearing 30309", "4T-30309"]

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standard = "ISO 355"

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128

[[presets]]

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id = "30310"

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title = "30310 (50 × 110 × 29.25)"

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params = { designation = "30310" }

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aliases = ["30310 bearing", "tapered roller bearing 30310", "4T-30310"]

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standard = "ISO 355"

134

name = "steve/tapered-roller-bearing"
version = "1.0.0"
runtime = "steve"
license = "MIT"
summary = "Tapered roller bearing, 302 and 303 series, bore 15 to 50 mm, as a boundary-dimension envelope."
description = """Tapered roller bearing (302 and 303 series) as an envelope for assemblies: one solid d x D x T, the overall width. Rollers and \
cage are not modelled. Axis along Z, centred on the origin. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker."""
tags = ["bearing", "roller-bearing", "tapered-roller", "iso-355", "metric"]

[parameters.designation]
type = "choice"
default = "30204"
choices = ["30203", "30204", "30205", "30206", "30207", "30208", "30209", "30210", "30302", "30303", "30304", "30305", "30306", "30307", "30308", "30309", "30310"]
label = "Bearing number"

[[presets]]
id = "30203"
title = "30203 (17 × 40 × 13.25)"
params = { designation = "30203" }
aliases = ["30203 bearing", "tapered roller bearing 30203", "4T-30203"]
standard = "ISO 355"

[[presets]]
id = "30204"
title = "30204 (20 × 47 × 15.25)"
params = { designation = "30204" }
aliases = ["30204 bearing", "tapered roller bearing 30204", "4T-30204"]
standard = "ISO 355"

[[presets]]
id = "30205"
title = "30205 (25 × 52 × 16.25)"
params = { designation = "30205" }
aliases = ["30205 bearing", "tapered roller bearing 30205", "4T-30205"]
standard = "ISO 355"

[[presets]]
id = "30206"
title = "30206 (30 × 62 × 17.25)"
params = { designation = "30206" }
aliases = ["30206 bearing", "tapered roller bearing 30206", "4T-30206"]
standard = "ISO 355"

[[presets]]
id = "30207"
title = "30207 (35 × 72 × 18.25)"
params = { designation = "30207" }
aliases = ["30207 bearing", "tapered roller bearing 30207", "4T-30207"]
standard = "ISO 355"

[[presets]]
id = "30208"
title = "30208 (40 × 80 × 19.75)"
params = { designation = "30208" }
aliases = ["30208 bearing", "tapered roller bearing 30208", "4T-30208"]
standard = "ISO 355"

[[presets]]
id = "30209"
title = "30209 (45 × 85 × 20.75)"
params = { designation = "30209" }
aliases = ["30209 bearing", "tapered roller bearing 30209", "4T-30209"]
standard = "ISO 355"

[[presets]]
id = "30210"
title = "30210 (50 × 90 × 21.75)"
params = { designation = "30210" }
aliases = ["30210 bearing", "tapered roller bearing 30210", "4T-30210"]
standard = "ISO 355"

[[presets]]
id = "30302"
title = "30302 (15 × 42 × 14.25)"
params = { designation = "30302" }
aliases = ["30302 bearing", "tapered roller bearing 30302", "4T-30302"]
standard = "ISO 355"

[[presets]]
id = "30303"
title = "30303 (17 × 47 × 15.25)"
params = { designation = "30303" }
aliases = ["30303 bearing", "tapered roller bearing 30303", "4T-30303"]
standard = "ISO 355"

[[presets]]
id = "30304"
title = "30304 (20 × 52 × 16.25)"
params = { designation = "30304" }
aliases = ["30304 bearing", "tapered roller bearing 30304", "4T-30304"]
standard = "ISO 355"

[[presets]]
id = "30305"
title = "30305 (25 × 62 × 18.25)"
params = { designation = "30305" }
aliases = ["30305 bearing", "tapered roller bearing 30305", "4T-30305"]
standard = "ISO 355"

[[presets]]
id = "30306"
title = "30306 (30 × 72 × 20.75)"
params = { designation = "30306" }
aliases = ["30306 bearing", "tapered roller bearing 30306", "4T-30306"]
standard = "ISO 355"

[[presets]]
id = "30307"
title = "30307 (35 × 80 × 22.75)"
params = { designation = "30307" }
aliases = ["30307 bearing", "tapered roller bearing 30307", "4T-30307"]
standard = "ISO 355"

[[presets]]
id = "30308"
title = "30308 (40 × 90 × 25.25)"
params = { designation = "30308" }
aliases = ["30308 bearing", "tapered roller bearing 30308", "4T-30308"]
standard = "ISO 355"

[[presets]]
id = "30309"
title = "30309 (45 × 100 × 27.25)"
params = { designation = "30309" }
aliases = ["30309 bearing", "tapered roller bearing 30309", "4T-30309"]
standard = "ISO 355"

[[presets]]
id = "30310"
title = "30310 (50 × 110 × 29.25)"
params = { designation = "30310" }
aliases = ["30310 bearing", "tapered roller bearing 30310", "4T-30310"]
standard = "ISO 355"

README.md 31 lines · Markdown

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Tapered roller bearing

302 and 303 series, bore 15 to 50 mm, as an envelope for assemblies: one solid d × D × T (T is the overall width). Axis along Z, centred on the origin. Rollers, cage and the separate cone and cup aren't modelled.

Source

NTN, Ball and Roller Bearings, CAT. No. 2203-3/E (2024), https://www.ntnglobal.com/en/products/catalog/pdf/2203E.pdf, PDF pages 165 to 167.

Number	d	D	T	B	C
30203	17	40	13.25	12	11
30204	20	47	15.25	14	12
30205	25	52	16.25	15	13
30206	30	62	17.25	16	14
30207	35	72	18.25	17	15
30208	40	80	19.75	18	16
30209	45	85	20.75	19	16
30210	50	90	21.75	20	17
30302	15	42	14.25	13	11
30303	17	47	15.25	14	12
30304	20	52	16.25	16	13
30305	25	62	18.25	17	15
30306	30	72	20.75	19	16
30307	35	80	22.75	21	18
30308	40	90	25.25	23	20
30309	45	100	27.25	25	22
30310	50	110	29.25	27	23

Maker names identify the source; this part isn't made by or affiliated with any maker.

# Tapered roller bearing

302 and 303 series, bore 15 to 50 mm, as an envelope for assemblies: one solid d × D × T (T is the overall width). Axis along Z, centred
on the origin. Rollers, cage and the separate cone and cup aren't modelled.

## Source

NTN, *Ball and Roller Bearings*, CAT. No. 2203-3/E (2024), <https://www.ntnglobal.com/en/products/catalog/pdf/2203E.pdf>, PDF pages 165 to 167.

| Number | d | D | T | B | C |
|---|---|---|---|---|---|
| 30203 | 17 | 40 | 13.25 | 12 | 11 |
| 30204 | 20 | 47 | 15.25 | 14 | 12 |
| 30205 | 25 | 52 | 16.25 | 15 | 13 |
| 30206 | 30 | 62 | 17.25 | 16 | 14 |
| 30207 | 35 | 72 | 18.25 | 17 | 15 |
| 30208 | 40 | 80 | 19.75 | 18 | 16 |
| 30209 | 45 | 85 | 20.75 | 19 | 16 |
| 30210 | 50 | 90 | 21.75 | 20 | 17 |
| 30302 | 15 | 42 | 14.25 | 13 | 11 |
| 30303 | 17 | 47 | 15.25 | 14 | 12 |
| 30304 | 20 | 52 | 16.25 | 16 | 13 |
| 30305 | 25 | 62 | 18.25 | 17 | 15 |
| 30306 | 30 | 72 | 20.75 | 19 | 16 |
| 30307 | 35 | 80 | 22.75 | 21 | 18 |
| 30308 | 40 | 90 | 25.25 | 23 | 20 |
| 30309 | 45 | 100 | 27.25 | 25 | 22 |
| 30310 | 50 | 110 | 29.25 | 27 | 23 |

Maker names identify the source; this part isn't made by or affiliated with any maker.

Use this part

STEVE

Open in STEVE

Open it in STEVE The STEVE runtime runs in STEVE: open the part there, or download the code and bundle.

Get the code

curl -o part.py "https://pythonparts.org/p/steve/tapered-roller-bearing/v/1.0.0/raw/part.py"

Raw files, bundle and API

part.py
pypart.toml
README.md
bundle.tar.gzthe package, as published

curl "https://pythonparts.org/api/v1/parts/steve/tapered-roller-bearing/1.0.0"

The version's JSON (parameters, presets, files); add /build?name=value for a build at other values.

About this part

steve73 parts

Profile

Steel (generic)Carbon & alloy steels · Custom finish · 7.9 g/cm³

Mass: 171 g

At the parameters shown in the viewer.

License: MIT

Permissive: use, change and sell it; keep the copyright notice.

Runtime: STEVE
Requirements: None stated in the code
Built with: CadQuery 2.9.0.dev0
Published: Nov 4, 2026
Downloads: 0
Builds: 2
Stars: 0
Bundle: 54bc75254054…

#bearing #roller-bearing #tapered-roller #iso-355 #metric

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Tapered roller bearing (302 and 303 series) as an envelope for assemblies: one solid d x D x T, the overall width. Rollers and cage are not modelled. Axis along Z, centred on the origin. Dimensions from a maker's public catalogue (see the README); not affiliated with any maker.

Tapered roller bearing

Source

NTN, Ball and Roller Bearings, CAT. No. 2203-3/E (2024), https://www.ntnglobal.com/en/products/catalog/pdf/2203E.pdf, PDF pages 165 to 167.

Number	d	D	T	B	C
30203	17	40	13.25	12	11
30204	20	47	15.25	14	12
30205	25	52	16.25	15	13
30206	30	62	17.25	16	14
30207	35	72	18.25	17	15
30208	40	80	19.75	18	16
30209	45	85	20.75	19	16
30210	50	90	21.75	20	17
30302	15	42	14.25	13	11
30303	17	47	15.25	14	12
30304	20	52	16.25	16	13
30305	25	62	18.25	17	15
30306	30	72	20.75	19	16
30307	35	80	22.75	21	18
30308	40	90	25.25	23	20
30309	45	100	27.25	25	22
30310	50	110	29.25	27	23

Maker names identify the source; this part isn't made by or affiliated with any maker.

1.1.0 Latest Nov 5, 2026 · 2 hours ago Compare with 1.0.0

Looks like a bearing: rings and rolling elements. detail = simple keeps one solid ring.
1.0.0 Nov 4, 2026 · 3 hours ago

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Source

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Source

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