Original unbranded tapered roller bearing concept visualization

BEARING SPECIFICATION / 30203

30203 Tapered Roller Bearing

17 × 40 × 13.25 mm · A focused approach to combined load. Compare the sourced reference data and specify your SANJ requirement.

Original product concept visualization

30203 dimensional schematic: bore 17 mm, outside diameter 40 mm, width 13.25 mm — Boundary dimension schematic · not a manufacturing drawing · not to scale

Tapered Roller Bearings

30203 at a glance

30203 identifies a tapered roller bearing reference with 17 mm bore, 40 mm outside diameter and 13.25 mm overall width or height.

Bore / d: 17 mm
Outside / D: 40 mm
Width / T: 13.25 mm

Tapered rollers carry combined radial and axial load. Confirm cone and cup designations, overall width and arrangement before selecting a replacement.

Enquire about 30203 ↗Download reference data ↓

Reference configuration: 30203JR
Ratings below belong to the identified JTEKT / Koyo source record. SANJ material, internal design, performance and supply scope require a confirmed quotation and datasheet.

TECHNICAL SOURCEJTEKT / Koyo · 30203JR ↗Source checked 2026-10-20Reference image source ↗

REFERENCE SPECIFICATION

All the details.
One clear source.

Full factual values from the source designation 30203JR. Mounting dimensions and reference mass relate to that design; they must be checked against the final SANJ drawing.

Load ratings: kN · dimensions: mm · speed: min⁻¹ · mass: kg

30203 — JTEKT / Koyo reference data
Parameter	Reference value
d	17 mm
D	40 mm
T	13.25 mm
B	12 mm
C	11 mm
r(min.)	1 mm
r1(min.)	1 mm
Basic load ratings : Cr	26.0 kN
Basic load ratings : C0r	20.7 kN
Fatigue load limit : Cu	2.85 kN
Limiting speeds(Grease lub.)	10000 min-1
Limiting speeds(Oil lub.)	14000 min-1
Load center spread : a	10.1 mm
Constant e	0.35
Axial load factors : Y1	1.74
Axial load factors : Y0	0.96
da(min.)	22.5 mm
db(max.)	23 mm
Da(max.)	34.5 mm
da(min.)	33 mm
db(min.)	37 mm
Sa(min.)	2 mm
Sb(min.)	2 mm
ra(max.)	1 mm
rb(max.)	1 mm
Mass(Refer.)	0.081 kg

SELECTION CONTEXT

Match the bearing
to its duty.

30203 belongs to the tapered roller bearings family. Its reference envelope is 17 mm bore, 40 mm outside diameter and 13.25 mm overall width or height.

Tapered rollers carry combined radial and axial load. Confirm cone and cup designations, overall width and arrangement before selecting a replacement.

For a manufacturing enquiry, provide the complete designation and operating conditions. Matching the dimensional envelope alone does not confirm interchangeability or equivalent performance.

Is the same size a direct replacement?

No. Matching 17 × 40 × 13.25 mm establishes the boundary dimensions. The full designation, tolerances, clearance, contact angle or roller arrangement, seals, cage, lubrication and performance must also be checked.

Understand bearing load ratings →

PREPARE A USEFUL ENQUIRY

Specify what the model
number leaves open.

A complete brief reduces assumptions and gives the quotation a clear technical basis.

Configuration

Full designation, seals or shields, accuracy, clearance, cage, material and any matched arrangement.

Operating duty

Radial and axial loads, speed, temperature, lubrication, fits, environment and expected service.

Supply requirement

Quantity, destination, packing, inspection records, drawing approval and delivery requirement.

30203 Tapered Roller Bearing

30203 at a glance

All the details.One clear source.

Match the bearingto its duty.

Is the same size a direct replacement?

Specify what the modelnumber leaves open.

Configuration

Operating duty

Supply requirement

More in this bearing family.

32205 ↗

32206 ↗

32207 ↗

Let’s specify your next bearing.

All the details.
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Match the bearing
to its duty.

Specify what the model
number leaves open.