NTN MRC.306MFF

Deep groove ball · Open

The seat — 30 MM × 72 MM × 19 MM

Bore

30 MM

Outside dia

72 MM

Width

19 MM

Type

Deep groove ball

Seal

Open

Clearance

CN (Normal)

Precision

ABEC-1 (P0)

Dynamic C

29.7 kN

Static C0

21.6 kN

144 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 — 26 designations · top 20 shown

Part number	Manufacturer	C	C0
306	NTN	29.7 kN	21.6 kN
306 NR	NTN	29.7 kN	21.6 kN
MRC.306M	NTN	29.7 kN	21.6 kN
MRC.306MF	NTN	29.7 kN	21.6 kN
MRC.306MFG	NTN	29.7 kN	21.6 kN
MRC.306MG	NTN	29.7 kN	21.6 kN
306K	Timken	29.6 kN	16.0 kN
6306	NTN	29.6 kN	16.0 kN
6306-2RZ	NTN	29.6 kN	16.0 kN
6306-ZNR	NTN	29.6 kN	16.0 kN
6306 JEM	NTN	29.6 kN	16.0 kN
6306 N	NTN	29.6 kN	16.0 kN
6306 NR	NTN	29.6 kN	16.0 kN
6306 NRJEM	NTN	29.6 kN	16.0 kN
6306 RSJEM	NTN	29.6 kN	16.0 kN
6306 ZJEM	NTN	29.6 kN	16.0 kN
MRC.306S	NTN	29.6 kN	16.0 kN
MRC.306SF	NTN	29.6 kN	16.0 kN
MRC.306SFF	NTN	29.6 kN	16.0 kN
MRC.306SFFG	NTN	29.6 kN	16.0 kN

Check before substituting — 118 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
21306 CC	NTN	65.7 kN	Type: Spherical — this part: Deep groove ball
21306 CC/C3	NTN	65.7 kN	Type: Spherical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
N 306 ECP	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NJ 306 ECJ	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NJ 306 ECJ/C3	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
NJ 306 ECM	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NJ 306 ECML	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NJ 306 ECP	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NJ 306 ECP/C3	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
NJ 306 ECP/C4	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball Clearance: C4 — this part: CN (Normal)
NU 306 ECJ	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball
NU 306 ECJ/C3	NTN	58.5 kN	Type: Cylindrical — this part: Deep groove ball 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.

BEARINGBRAIN.COM/PART/MRC.306MFF/SUBSTITUTE