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Product Series of Automation-Related Precision Ball Screws and Linear Rails – High-Precision Ball Screws

NSK Bearings Tapered Roller Bearings 30311D

Product Overview

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Tapered Roller Bearings/Bearings

30311D

Tapered Roller Bearing

Bore d55 mm
Width T31.5 mm

Product Features

NSK tapered roller bearing (30311 series), model 30311D: 55 mm bore, 120 mm OD, 31.5 mm width
Basic dynamic load rating Cr 161 kN, basic static load rating C0r 153 kN (NSK official catalog; current-generation equivalent HR30311DJ, Cr/C0r figures above are taken from that current design)
Limiting speed approx. 2800 min⁻¹ (grease), 4000 min⁻¹ (oil)
Carries combined radial load and axial load in one direction; inner and outer rings are separable for easy mounting and service
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list

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Product Specifications

Specification	Unit	30311D
Series	-	30311 series
Bore d	mm	55
Outer diameter D	mm	120
Width T	mm	31.5
Min. chamfer r	mm	2.5
Basic dynamic load rating Cr	kN	161
Basic static load rating C0r	kN	153
Limiting speed (grease)	min⁻¹	2800
Limiting speed (oil)	min⁻¹	4000

Product Description

The 30311D is an NSK tapered roller bearing from the 30311 series: 55 mm bore, 120 mm outer diameter, 31.5 mm width. Tapered roller bearings use a tapered inner ring, rollers and outer raceway so a single bearing carries combined radial load and axial load in one direction; inner and outer rings are separable, giving flexible mounting and clearance adjustment. Basic dynamic load rating Cr is 161 kN and basic static load rating C0r is 153 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent HR30311DJ, Cr/C0r figures above are taken from that current design).

Inquiries & customization

Add this part number to your inquiry list — Nahshon is NSK's distributor in Taiwan and works directly with the factory to confirm specifications, stock and pricing.