NSK 6309DDU

Deep groove ball · 2RS contact seal

The seat — 45 MM × 100 MM × 25 MM

Bore

45 MM

Outside dia

100 MM

Width

25 MM

Type

Deep groove ball

Seal

2RS contact seal

Clearance

Precision

ABEC-1 (P0)

Dynamic C

52.7 kN

Static C0

31.0 kN

164 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 — 18 designations

Part number	Manufacturer	C	C0
6309-2RS1	NTN	55.3 kN	31.5 kN
6309-2RS1/GJN	NTN	55.3 kN	31.5 kN
6309-2RS1NR	NTN	55.3 kN	31.5 kN
6309-RS1	NTN	55.3 kN	31.5 kN
6309 2RSJEM	NTN	55.3 kN	31.5 kN
6309 2RSNRJEM	NTN	55.3 kN	31.5 kN
6309.2RSR	FAG (Schaeffler)	53.2 kN	30.3 kN
6409.2RSR	FAG (Schaeffler)	53.2 kN	31.3 kN
309PP	Timken	52.7 kN	31.0 kN
6309-2RS	KOYO (JTEKT)	52.7 kN	31.0 kN
6309-2RSH	NTN	52.7 kN	31.0 kN
6309-2RSR	FAG (Schaeffler)	52.7 kN	31.0 kN
6309LLU	NTN	52.7 kN	31.0 kN
6409-2RS1	NTN	52.7 kN	31.0 kN
63092RS	Timken	52.2 kN	29.7 kN
64092RS	Timken	52.2 kN	30.7 kN
6409DDU	NSK	51.6 kN	30.4 kN
6409LLU	NTN	51.1 kN	30.1 kN

Check before substituting — 146 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
21309 E	NTN	129.0 kN	Type: Spherical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
21309 E/C3	NTN	129.0 kN	Type: Spherical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN
21309 EK	NTN	129.0 kN	Type: Spherical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
21309 EK/C3	NTN	129.0 kN	Type: Spherical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN
N 309 ECP	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 309 ECJ	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 309 ECJ/C3	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN
NJ 309 ECM	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 309 ECML	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 309 ECML/C3	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN
NJ 309 ECP	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal
NJ 309 ECP/C3	NTN	112.0 kN	Type: Cylindrical — this part: Deep groove ball Seal: Open — this part: 2RS contact seal Clearance: C3 — this part: CN

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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