Four Row Cylindrical Roller Bearings

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Introduction

Cylindrical roller bearings have a large load capacity and mainly bear radial loads. Its structure is simple, including cylindrical rolling elements, inner rings, outer rings, and retainers. Single-row cylindrical roller bearings are the most basic type. Its different structures are reflected in the different designs of the ribs. Common basic cylindrical roller bearing types include N NU, NJ NF, and NUP.

The following chart is a simple summary of the comparison of the different rib types for cylindrical roller bearings.

Type	Inner Ring	Outer Ring	Axial Displacement	Axial Load
N	Double Rib	No Rib	Large	None
NU	No Rib	Double Rib	Large	None
NJ	Double Rib	Single Rib	Limited	Small One-Way
NF	Double Rib	Single Rib	Poor	Large One-Way
NUP	Single Rib + Loose Ring	Double Rib	Restricted	Two-Way

Inquiry	Bearing Number		Basic Dimensions
Inquiry	Type1	Type2	d	D	B
	672820	FC202870	100	140	70
	672722	FC2234120	110	170	120
	672724	FC2430105	120	180	105
	672728	FC2842125	140	210	125
	672829	FC2942155	145	210	155
	672732	FC3246180	160	230	180
	672734	FC3450170	170	250	170
	672838	FC3854168	190	270	168
	672738	FC3854200	190	270	200
	672740	FC4058192	200	290	192
	672844	FC4468200	220	340	200
	672852	FC5280335	260	400	335
	672756	FC5678220	280	390	220
	672760	FC6084240	300	420	240
	672770	FC70100380	350	500	380
	672772	FC72102370	360	510	370
	672780	FCD80112300	400	560	300
	6727/570	FCD114150530	570	750	530
	66721/630	FCDP126184515	630	920	515