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N238 - NTN

N238

Single row cylindrical roller bearing, floating, separable, brass cage

In the cylindrical roller bearing range, the single row roller bearing withstands high radial loads. The standard ISO ranges (NU, N, NJ, NF, NUP, NH, RNU, HJ) are available with different types of cage, bore diameters, shoulder rings.

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Technical datasheet

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Specs

PRODUCT DIMENSIONS

Internal diameter (d) 190 mm
External diameter (D) 340 mm
Bearing/Inner ring width (B) 55 mm
Upper roller diameter E 299 mm
Under roller diameter F 231 mm
d1 244,5 mm
Min fillet radius (rs) 4 mm
Min fillet radius r1s 4 mm
Radial clearance class CN
Mass 20,8 kg
Brand NTN
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PRODUCT PERFORMANCE

Dynamic load (C) 615 kN
Static load (C0) 770 kN
Fatigue limit load (Cu) 70 kN
Nlim (oil) 2200 tr/min
Nlim (grease) 1900 tr/min
Min operating temperature (Tmin) -40 °C
Max operating temperature (Tmax) 120 °C
Characteristic cage frequency, FTF 0,436 Hz
Characteristic rolling element frequency, BSF 7,666 Hz
Characteristic outer ring frequency, BPF0 8,281 Hz
Characteristic inner ring frequency, BPFI 10,719 Hz

ABUTMENT

Min shoulder diameter IR (da min) 206 mm
Max shoulder diameter OR (Da max) 324 mm
Min shoulder diameter small face Db min 303 mm
Max N type OR GO diameter Dc max 296 mm
Max fillet radius ra max 3 mm
Maxi fillet radius r1a 3 mm
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