NTN 6321/C3

Deep groove ball · Open

The seat — 105 MM × 225 MM × 49 MM

Bore

105 MM

Outside dia

225 MM

Width

49 MM

Type

Deep groove ball

Seal

Open

Clearance

Precision

ABEC-1 (P0)

Dynamic C

182.0 kN

Static C0

153.0 kN

14 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 — 1 designation

Part number	Manufacturer	C	C0
6321 M/C3VL0241	NTN	195.0 kN	153.0 kN

Check before substituting — 13 designations · top 12 shown

Part number	Manufacturer	C	Differs from this part
N 321 ECP	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
NJ 321 ECJ	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
NJ 321 ECP	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
NU 321 ECJ	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
NU 321 ECJ/C3	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball
NU 321 ECML	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
NU 321 ECP	NTN	500.0 kN	Type: Cylindrical — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
7321 BECBM	NTN	216.0 kN	Type: Angular — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
7321 BECBP	NTN	216.0 kN	Type: Angular — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
7321 BEGAM	NTN	216.0 kN	Type: Angular — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
7321 BEP	NTN	203.0 kN	Type: Angular — this part: Deep groove ball Clearance: CN (Normal) — this part: C3
6321	NTN	182.0 kN	Clearance: CN (Normal) — this part: C3

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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