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NTN 30311: bore d 55.000 mm, outside diameter D 120.000 mm, width T 31.500 mm, drawn to scaled 55.000 mmD 120.000 mmT 31.500 mm
Drawing: BearingLookup, to the printed bore d, outside diameter D and width T cited in the specifications below; internal detail is illustrative.

NTN 30311 metric tapered roller bearing

NTN 30311 metric tapered roller bearing: bore d 55.000 mm (2.1650 in), outside diameter D 120.000 mm (4.7244 in), width 31.500 mm (1.2402 in).

Metric tapered roller bearings · All NTN part numbers

Cutaway rendering of a tapered roller bearing with the cup pulled away to show the tapered rollers on the cone
A typical metric tapered roller bearing — not necessarily this part. Photo: “Tapered-roller-bearing din720 120-ex” by Silberwolf, CC BY 2.5, via Wikimedia Commons (resized).

Specifications

Bore d55.000 mm (2.1650 in)
Outside diameter D120.000 mm (4.7244 in)
Width31.500 mm (1.2402 in)
Basic dynamic load rating Cr155.00 kN
Basic static load rating C0r179.00 kN

All specifications: Verified printed in NTN’s own product listing

Same size, other makers and types (55 × 120 × 31.5 mm)

PartManufacturerType
30311CRKoyometric tapered roller bearing
30311DJRKoyometric tapered roller bearing
30311JRKoyometric tapered roller bearing

These match this part on the dimensions each maker prints. A size match is not a stated interchange: check the other specifications before substituting.

Related parts

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