NSK 6228DDU

Deep groove ball · 2RS contact seal

The seat — 140 MM × 250 MM × 42 MM

Bore

140 MM

Outside dia

250 MM

Width

42 MM

Type

Deep groove ball

Seal

2RS contact seal

Clearance

CN (Normal)

Precision

ABEC-1 (P0)

Dynamic C

170.5 kN

Static C0

119.6 kN

34 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 — 4 designations

Part number	Manufacturer	C	C0
6228.2RSR	FAG (Schaeffler)	175.7 kN	123.2 kN
6228-2RS1	NTN	174.0 kN	122.0 kN
62282RS	Timken	172.3 kN	120.8 kN
6228LLU	NTN	168.8 kN	118.3 kN

Check before substituting — 30 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
NJ 228 ECJ	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 228 ECJ/C3	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN (Normal)
NJ 228 ECML	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NU 228 ECJ	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NU 228 ECJ/C3	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN (Normal)
NU 228 ECM	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NU 228 ECM/C3	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN (Normal)
NU 228 ECML	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NU 228 ECML/C3	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN (Normal)
NUP 228 ECJ	NTN	450.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
QJ 228 N2MA	NTN	345.0 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
QJ 228 N2MA/C3	NTN	345.0 kN	Type: Angular — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN (Normal)

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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