NTN MRC.311SF

Deep groove ball · Open

The seat — 55 MM × 120 MM × 29 MM

Bore

55 MM

Outside dia

120 MM

Width

29 MM

Type

Deep groove ball

Seal

Open

Clearance

CN (Normal)

Precision

ABEC-1 (P0)

Dynamic C

74.1 kN

Static C0

45.0 kN

138 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 — 22 designations · top 20 shown

Part number	Manufacturer	C	C0
311	NTN	79.2 kN	67.0 kN
311-ZNR	NTN	79.2 kN	67.0 kN
311 NR	NTN	79.2 kN	67.0 kN
MRC.311M	NTN	79.2 kN	67.0 kN
MRC.311MFF	NTN	79.2 kN	67.0 kN
MRC.311MFG	NTN	79.2 kN	67.0 kN
6311-ZNR	NTN	74.1 kN	45.0 kN
6311/W64	NTN	74.1 kN	45.0 kN
6311 JEM	NTN	74.1 kN	45.0 kN
6311 N	NTN	74.1 kN	45.0 kN
6311 NR	NTN	74.1 kN	45.0 kN
6311 NRJEM	NTN	74.1 kN	45.0 kN
6311 RSJEM	NTN	74.1 kN	45.0 kN
6311 ZJEM	NTN	74.1 kN	45.0 kN
6311 ZNRJEM	NTN	74.1 kN	45.0 kN
MRC.311S	NTN	74.1 kN	45.0 kN
MRC.311SFF	NTN	74.1 kN	45.0 kN
MRC.311SG	NTN	74.1 kN	45.0 kN
6411	NTN	73.8 kN	44.1 kN
311K	Timken	71.5 kN	44.0 kN

Check before substituting — 116 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
21311 E	NTN	159.0 kN	Type: Spherical — this part: Deep groove ball
21311 E/C3	NTN	159.0 kN	Type: Spherical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
21311 EK	NTN	159.0 kN	Type: Spherical — this part: Deep groove ball
21311 EK/C3	NTN	159.0 kN	Type: Spherical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
N 311 ECM	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
N 311 ECP	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
NJ 311 ECJ	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
NJ 311 ECJ/C3	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: C3 — this part: CN (Normal)
NJ 311 ECM	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
NJ 311 ECML	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
NJ 311 ECP	NTN	156.0 kN	Type: Cylindrical — this part: Deep groove ball
NJ 311 ECP/C3	NTN	156.0 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.311SF/SUBSTITUTE