NSK 5308AZZ dimensions and technical reference
NSK 5308AZZ is a double row angular contact bearing reference with boundary dimensions 40×90×36.5 mm. The order is bore d × outside diameter D × bearing width B. Use the full marking and construction, not only the base number, when comparing candidates.
Rows and closure identification
Two rows are integrated into common inner and outer rings, in a construction comparable to a back-to-back arrangement. This supports axial loads in both directions and moment loading; it is not the same assembly as two separate single-row bearings. ZZ indicates steel shields on both sides. A, B and A1 within these double-row catalogue markings distinguish listed designs; do not decode them using the single-row 30°/40° suffix rule.
Equivalent-load calculation
For Fr > 0 and Fa/Fr ≤ 0.68, P = Fr + 0.92Fa. Above that ratio, P = 0.67Fr + 1.41Fa. Static equivalent load is P0 = Fr + 0.76Fa. These are the factors printed for this double-row family; use consistent load units and the matching model ratings.
Reading speed and lubrication data
The source gives a grease limiting speed of 5300 r/min. These values are for the stated bearing version, not every cage or closure sharing the same dimensions. Near the limit, assess load, lubricant, temperature and heat removal; a catalogue speed is not a guaranteed continuous-duty speed.
Selection and mounting limits
- Open, ZZ and DDU rows may have different load ratings, load-centre spacing and shoulder dimensions despite equal d, D and B. Do not substitute an open-row figure for a sealed version.
- NSK requires a grease code for a complete two-sided shield/seal designation. This table stem does not establish a specific grease fill, life or temperature rating; those remain to be checked on the supplied marking.
- The printed mass is shared by the shielded/sealed row, not independently measured for each closure. Oil limiting speed is not stated for this closed version and is not copied from the open model.
- A numerical contact angle, internal-clearance range and precision class are not specified by this table row. They have not been inferred from another brand or from single-row suffix rules.
- A rating is a calculation reference, not an allowable load for an unspecified machine. Lubrication, fit, temperature, alignment and operating load still matter.
- This source does not establish machine fitment, replacement approval, a CAD file, friction torque or an installed preload. Missing values remain unstated rather than being copied from a similar model.
Technical basis:NSK Rolling Bearings for Industrial Machinery, E1103d (2025), Part C, C106–C107; construction and identification rules C072–C077. Source checked 2026-10-01. Independently organised technical reference, not a sales offer or interchange approval.
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