NTNHSB016CAEDBGNP4LSuper-Precision Spindle Angular Contact Ball Bearing Pair – 80 mm ID, 125 mm OD, 22 mm Width Each, Open, 15° Contact Angle, Back-to-Back Matched Set, 2 Pcs.

Product Description

What this part is

NTN HSB016CAEDBGNP4L super-precision angular contact ball bearings, supplied as a back-to-back matched pair. Each bearing has an 80 mm bore, 125 mm outside diameter and 22 mm width, single row, open. Fifteen-degree contact angle, ABEC 7 precision, moulded polyamide cage.

Decoding the designation

HSB is the NTN high-speed super-precision spindle bearing series. 016 is the bore code, giving 80 mm — the 7016 envelope. On the NTN angular contact letter scheme, C denotes the 15° contact angle. DB marks a back-to-back matched pair. P4 is the precision class, equivalent to ABEC 7.

What these specs mean in practice

A 15° contact angle is the high-speed, low-thrust end of the range, favouring running speed and radial stiffness over axial capacity. The HSB series is built for machine tool spindles, where speed and running accuracy govern. The moulded polyamide cage is light and quiet, with a working ceiling around 120 °C. Operating range −30 °C to 120 °C.

Arrangement

Back-to-back places the two contact-angle lines diverging outward from the bearing bore, which widens the effective support span and gives the highest moment and tilting stiffness of the paired arrangements. The pair takes thrust in both directions and locates the shaft axially. Face-to-face by contrast narrows the span, and tandem doubles capacity in one direction only.

Quantity and configuration

2 Pcs — one back-to-back matched pair. Total assembled width 44 mm. Open on all faces, no snap ring.

Fitting notes

Matched-set bearings are marked on the ring faces and are mounted in the marked orientation so the ground back-to-back relationship is kept. Both rings are clamped square against ground shoulders, and the pair is fitted as a set rather than mixed with bearings from another set. At ABEC 7, shaft journal and housing bore geometry carry directly through to spindle runout.

Interchange guidance

The 7016 designation covers this 80 x 125 x 22 mm envelope across makers, and a 7016C from another super-precision maker shares the angle and the envelope. A 7016 at a 25° or 30° angle, at a different precision class, or supplied as a single or as a face-to-face set, is a related size rather than a substitution — the angle sets the load split and the matched arrangement sets the sale unit.