NAA SERIES

NAA Cylindrical O.D. Eccentric Insert Bearing

Cylindrical Outside Diameter with Eccentric Collar. Catalogue-backed dimensions, exact series drawing and RFQ support from GBC.

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Product Overview

NAA is a specialized cylindrical-OD, eccentric-collar insert. The uploaded catalogue shows a compact model set, so this page is deliberately narrow rather than presenting unsupported sizes.

The published drawing and dimensional table follow the GBC insert-bearing catalogue for this NAA series. It is defined by eccentric locking collar, a cylindrical outside diameter, and the dimensional rows listed below. For broader bearing navigation, explore the Bearings range.

Dimensional Drawing

The drawing below is cropped directly from the supplied catalogue. Use its dimension letters with the table; do not scale the image to estimate dimensions.

Technical Parameters

Base metric rows and documented catalogue models are shown here. Inch-bore suffixes remain available where they appear in the catalogue; quote the complete suffix when an inch shaft is involved. Load ratings are catalogue values and should be checked together with duty, speed, lubrication and mounting conditions.

Selection and Housing Match

Use the exact model code. The table shows materially different envelopes for NAA306 and NAA310, so a substitute should be checked dimension by dimension rather than selected from bore diameter alone.

Installation Notes

Verify the cylindrical seat and the eccentric collar before assembly. Lock the collar in the shaft rotation direction and secure it after the bearing is seated. Send the housing drawing if the surrounding dimensions differ from the catalogue sketch.

The catalogue installation note for eccentric locking types is to rotate the eccentric collar in the direction of shaft rotation, then tighten the set screw on the collar. Keep the collar and shaft clean so the locking action is repeatable.

Catalogue Construction Notes

The catalogue describes insert bearings as single-row deep-groove ball bearings and shows dual-seal and triple-lip sealing arrangements within the product family. It also documents hardened inner-ring areas and an anti-rotation device used when a spherical insert is fitted with clearance in its housing. Confirm the exact suffix when a particular seal is required.

Typical Applications

This series is considered for special machinery and cartridge-style bearing locations that call for the NAA geometry. Application fit still depends on shaft size, housing geometry, contamination, relubrication needs and the real radial/axial load pattern. For food-processing equipment, specify any material, lubricant or washdown requirement explicitly rather than assuming the standard insert meets a hygienic specification.

Ordering Information

Model codes should be ordered exactly as documented. The catalogue uses -G for relubricatable versions in applicable SB/SA families, C-prefix notation for cylindrical outside-diameter variants, 2RS where the double-rubber-seal designation is part of the model, and +H for UK adapter-sleeve combinations. Not every suffix applies to every series.

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