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NTN 3187/3120: bore d 1.1875 in, outside diameter D 2.8593 in, width W 1.1875 in, drawn to scaled 1.1875 inD 2.8593 inW 1.1875 in
Drawing: BearingLookup, to the printed bore d, outside diameter D and width W cited in the specifications below; internal detail is illustrative.

NTN 3187/3120 inch tapered roller bearing

NTN 3187/3120 inch tapered roller bearing: bore d 1.1875 in (30.162 mm), outside diameter D 2.8593 in (72.626 mm), width 1.1875 in (30.162 mm).

Inch tapered roller bearings · All NTN part numbers

Rendering of a tapered roller bearing with the outer cup separated from the cone and its ring of tapered rollers
A typical inch tapered roller bearing — not necessarily this part. Photo: “Tapered-roller-bearing din720 ex” by Silberwolf, CC BY 2.5, via Wikimedia Commons (resized).

Specifications

Bore d1.1875 in (30.162 mm)
Outside diameter D2.8593 in (72.626 mm)
Width1.1875 in (30.162 mm)
Basic dynamic load rating Cr84.50 kN
Basic static load rating C0r98.00 kN

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

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