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Super Precision Cylindrical Roller Bearings

ZHIO® cylindrical roller bearings have many designs, dimension series and sizes. The majority is single row bearings with a cage. Single and double row full complement bearings (without cage) complete the ZHIO® standard assortment for general engineering. Bearings with a cage can accommodate heavy radial loads and operate at high speeds. Full complement cylindrical roller bearings are suitable for very heavy radial loads at moderate speeds.

The rollers of ZHIO® cylindrical roller bearings are key components. Their geometry, the so-called logarithmic profile, provides an optimum stress distribution in the contact zones in the bearing. Their surface finish maximizes lubricant film formation and optimizes rolling motion of the rollers. The benefits derived from this compared with traditional designs include enhanced operational reliability and a greater insensitivity to misalignment.

The range of ZHIO® cylindrical roller bearings comprises the basic types.
ZHIO® single row cylindrical roller bearings, caged, mainly of the NU, NJ, NUP and N designs.
ZHIO® double row cylindrical roller bearings, caged, mainly of the NNUand NN designs.
ZHIO® single row full complement cylindrical roller bearings, mainly of the NCF and NJG designs.
ZHIO® double row full complement cylindrical roller bearings, mainly of the NNF design.

ZHIO® cylindrical roll bearings have the following design features:
1. Optimized design in ribs and rollers to enhance the axial load capacity
2. Optimized design in the geometric surface between rollers and raceway to balance the radial load distribution
3. Limit the width of raceway undercut, increase the contact area between raceway and rollers and enhance the radial load capacity
4. High standard material, strictly control the element content, e.g. Ti<30ppm
5. Low noise design, reaches to V1 grade noise level, contributes to the quieter running of automobile engine and gearbox.

Dimension(mm) Radial Load
Model inside Outside Height Dynamic Static Maximum Speed Weight
NNU 49/670 BK/SPW33X 670 mm 900 mm 230 mm 4950 kN 13700 kN 410 kg
NNU 49/670 B/SPW33X 670 mm 900 mm 230 mm 4950 kN 13700 kN 410 kg
NNU 49/600 BK/SPW33X 600 mm 800 mm 200 mm 3580 kN 10200 kN 280 kg
NNU 49/500 BK/SPW33X 500 mm 670 mm 170 mm 2330 kN 6100 kN 173 kg
NNU 49/500 B/SPW33X 500 mm 670 mm 170 mm 2330 kN 6100 kN 165 kg
NNU 4992 BK/SPW33 460 mm 620 mm 160 mm 2090 kN 5500 kN 130 kg
NNU 4992 B/SPW33 460 mm 620 mm 160 mm 2090 kN 5500 kN 142 kg
NN 3092 K/SPW33 460 mm 680 mm 163 mm 2600 kN 5500 kN 200 kg
NNU 4984 BK/SPW33 420 mm 560 mm 140 mm 1510 kN 4000 kN 91 kg
NNU 4984 B/SPW33 420 mm 560 mm 140 mm 1510 kN 4000 kN 99 kg
NNU 4980 BK/SPW33 400 mm 540 mm 140 mm 1470 kN 3800 kN 87.5 kg
NNU 4980 B/SPW33 400 mm 540 mm 140 mm 1470 kN 3800 kN 88 kg
NN 3080 K/SPW33 400 mm 600 mm 148 mm 2160 kN 4500 kN 135 kg
NN 3076 K/SPW33 380 mm 560 mm 135 mm 1680 kN 3450 kN 105 kg
NNU 4972 BK/SPW33 360 mm 480 mm 118 mm 1120 kN 2800 kN 55 kg
NN 3072 K/SPW33 360 mm 540 mm 134 mm 1720 kN 3450 kN 102 kg
NNU 4968 BK/SPW33 340 mm 460 mm 118 mm 1100 kN 2650 kN 56 kg
NNU 4968 B/SPW33 340 mm 460 mm 118 mm 1100 kN 2650 kN 59 kg
NN 3068 K/SPW33 340 mm 520 mm 133 mm 1650 kN 3250 kN 94.5 kg
NNU 4964 BK/SPW33 320 mm 440 mm 118 mm 1060 kN 2500 kN 48 kg
NNU 4964 B/SPW33 320 mm 440 mm 118 mm 1060 kN 2500 kN 55 kg
NN 3064 K/SPW33 320 mm 480 mm 121 mm 1320 kN 2600 kN 73 kg
NNU 4960 BK/SPW33 300 mm 420 mm 118 mm 1020 kN 2360 kN 50 kg
NNU 4960 B/SPW33 300 mm 420 mm 118 mm 1020 kN 2360 kN 50 kg
NN 3060 K/SPW33 300 mm 460 mm 118 mm 1250 kN 2400 kN 69 kg
NNU 4956 BK/SPW33 280 mm 380 mm 100 mm 765 kN 1800 kN 32.5 kg
NNU 4956 B/SPW33 280 mm 380 mm 100 mm 765 kN 1800 kN 32.5 kg
NN 3056 K/SPW33 280 mm 420 mm 106 mm 1080 kN 2080 kN 49.2 kg
NNU 4952 BK/SPW33 260 mm 360 mm 100 mm 748 kN 1700 kN 30.5 kg
NNU 4952 B/SPW33 260 mm 360 mm 100 mm 748 kN 1700 kN 30.5 kg
NN 3052 K/SPW33 260 mm 400 mm 104 mm 1020 kN 1930 kN 45.3 kg
NN 3052 K/SPVS019 260 mm 400 mm 104 mm 1020 kN 1930 kN 45.3 kg
NNU 4948 BK/SPW33 240 mm 320 mm 80 mm 528 kN 1220 kN 17.5 kg
NNU 4948 B/SPW33 240 mm 320 mm 80 mm 528 kN 1220 kN 17.5 kg
NN 3048 K/SPW33 240 mm 360 mm 92 mm 842 kN 1560 kN 30.7 kg
NN 3048 K/SPC2W33 240 mm 360 mm 92 mm 842 kN 1560 kN 30.7 kg
NNU 4944 BK/SPW33 220 mm 300 mm 80 mm 512 kN 1140 kN 16.5 kg
NNU 4944 B/SPW33 220 mm 300 mm 80 mm 512 kN 1140 kN 16.5 kg
NN 3044 K/SPW33VS019 220 mm 340 mm 90 mm 809 kN 1460 kN 28.2 kg
NN 3044 K/SPW33 220 mm 340 mm 90 mm 809 kN 1460 kN 28.2 kg