NTN W 61903-2RS1

Deep groove ball · 2RS contact seal

The seat — 17 MM × 30 MM × 7 MM

Bore

17 MM

Outside dia

30 MM

Width

7 MM

Type

Deep groove ball

Seal

2RS contact seal

Clearance

CN (Normal)

Precision

ABEC-1 (P0)

Dynamic C

4.0 kN

Static C0

2.5 kN

40 other designations in the catalogue share this bore × outside diameter × width. Each was compared on the four fields every bearing row carries — Type, Seal, Clearance, Precision — as recorded, case- and separator-insensitively. All four agreeing puts a designation in the first list; anything else, a difference or a blank, puts it in the second with the fields named.

Candidates at the recorded dimensions above

May substitute — 6 designations

Part number	Manufacturer	C	C0
61903-2RS1	NTN	4.6 kN	2.5 kN
6903.2RSR	FAG (Schaeffler)	3.2 kN	1.8 kN
6903-2RS1	NTN	3.1 kN	1.8 kN
69032RS	Timken	3.1 kN	1.8 kN
6903DDU	NSK	3.1 kN	1.8 kN
6903LLU	NTN	3.0 kN	1.7 kN

Check before substituting — 34 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
61903	NTN	4.6 kN	Seal: Open — this part: 2RS contact seal
61903-2RZ	NTN	4.6 kN	Seal: Open — this part: 2RS contact seal
61903-2Z	NTN	4.6 kN	Seal: 2Z shield — this part: 2RS contact seal
MRC.1903S	NTN	4.6 kN	Seal: Open — this part: 2RS contact seal
71903 CD/P4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
71903 CDGA/HCP4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
71903 CDGA/P4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
71903 CDGB/HCP4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
71903 CDGB/P4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
71903 CDGC/P4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
S71903 CDGA/HCP4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
S71903 CDGA/P4A	NTN	4.2 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal

What this sheet is — and what the catalogue did not say

The envelope is recorded dimensions only: the same bore, outside diameter and width. Every designation above shares all three, or it would not be on this page.
The four compared fields are Type, Seal, Clearance, Precision. Two recorded spellings were counted to mean one value and are read as one: CN/Normal = CN, and ABEC-1/P0 = P0. A third precision spelling, P0/Class4, is deliberately not equated with either — the catalogue's meaning for it has not been sourced, so it lands in the warnings where both spellings are printed for the reader to judge.
A blank is a difference. Missing is the absence of the proof, not the proof.
Cage material and ring material are never compared: the catalogue records neither, on any bearing row.
Suffixes the catalogue does not record separately — a snap ring (NR) and anything else outside those four fields — are not compared, and this sheet does not claim they match.
Ranking is recorded dynamic load, strongest first, with an unrecorded rating ranked last. It orders the lists; it is not a verdict.
Compiled from catalogue records. This is not a manufacturer interchange list, no manufacturer has confirmed any line on it, and it does not know what job the bearing is doing. Verify before fitting.

Anyone with this link can view this part and its recorded candidate comparison.

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