NN3044-AS-K-M-SP FAG Precision Double Row Cylindrical Roller Bearing with Tapered Bore 220x340x90mm - 2-3 Days Delivery

Cylindrical roller bearings for main spindles are used when the very highest precision is required under very high radial load. Typical areas of application include machine tools and printing machinery. The bearings facilitate bearing arrangements with very high precision, high radial rigidity and very high load carrying capacity. In machine tool building, they provide radial support for the main spindle.

These are single or double row cylindrical roller bearings with a largely tapered bore (taper 1:12) and a removable outer ring, which can thus be mounted separately from the normal bearing package. The inner ring is only removable in the case of series NNU49.

The bearings are available in various designs which are matched to different requirements. For example, hybrid cylindrical roller bearings with half the number of rollers can achieve extremely high speeds.

Main Dimensions & Performance Data

d	220 mm	Bore diameter
D	340 mm	Outside diameter
B	90 mm	Width
Cr	810,000 N	Basic dynamic load rating, radial
C0r	1,450,000 N	Basic static load rating, radial
Cur	166,000 N	Fatigue load limit, radial
nG Grease	2,290 1/min	Limiting speed for grease lubrication
nG Oil	2,700 1/min	Limiting speed for oil lubrication
≈m	29.1 kg	Weight

Mounting dimensions

da	254 mm	diameter shaft shoulder
	h12	diameter shaft shoulder tolerance
Da	317 mm	diameter of housing shoulder
	H12	Shoulder diameter outer ring clearance
ra1 max	2.5 mm	Maximum recess radius

Dimensions

r1 min	3 mm	Minimum chamfer dimension
E	310 mm	Raceway diameter outer ring
ns	15 mm	Width of lubricating groove
ds	8 mm	Diameter lubrication hole
s	5.7 mm	Axial displacement

Temperature range

Tmin	-30 °C	Operating temperature min.
Tmax	150 °C	Operating temperature max.

Your current product variant

Cage	M	Brass Cage
Tolerance class	SP	tolerance class SP
Bore type	K	Tapered, taper 1:12
Change mark	A	Internal Variant A
Radial internal clearance	C1 (Group 1)	Internal clearance smaller than C2
Number of rolling element rows	2	Double-row design