NSK80BAR10STYNDBELP4AAngular Contact Thrust Ball Bearing — 80 mm ID, 125 mm OD, 20 mm Width, Open, 30° Contact Angle, Back-to-Back DB, Extra Light Preload, 2 Pcs

Product Description

What this part is

NSK 80BAR10STYNDBELP4A, a high-speed angular contact thrust ball bearing from NSK’s BAR10 spindle range, supplied as two pieces matched back-to-back. Bore: 80 mm. Outside diameter: 125 mm. Width: 20 mm per bearing. Series: BAR10. Contact angle: 30°. Country of origin as recorded: Japan.

Decoding the order code

80: bore, 80 mm. BAR10: NSK’s high-speed angular contact thrust series, 10 dimension section, published at a 30° contact angle. S: bearing steel, SUJ2. TYN: ball-guided polyamide resin cage. DB: back-to-back matched pair. EL: extra light preload. P4A: ISO Class 4 accuracy, ABEC 7.

What these specs mean in practice

A 30° contact angle puts this bearing between the 15 to 25° spindle bearings and the 60° ball-screw-support types: more thrust capacity than a 7000-series angular contact of the same envelope, and more speed capability than a 40° BTR or a 60° thrust type. NSK’s own wording for the series is that the 30° angle delivers higher speed capability. The ball-guided polyamide cage is quiet, wear-resistant and particularly effective under grease lubrication, at a lower dmn ceiling than an outer-ring-guided phenolic cage. Extra light preload is the lowest of NSK’s four preload steps, chosen where heat generation and running torque matter more than rigidity.

Quantity and configuration

Two pieces, matched back-to-back at extra light preload. Back-to-back mounting carries thrust in both directions and takes moment loads across a wide load-centre spread.

Fitting notes

Both faces are open. A back-to-back pair is fitted with the wide faces of the outer rings together. Bore and outside diameter tolerances are to ISO Class 4, so shaft and housing fits should be specified to match rather than to a standard-class table.

Interchange guidance

BAR10 is an NSK designation, so the closest cross-references are within NSK: 80BAR10ETYNDBELP4A is the same size and preload in NSK’s EQTF steel, and 80BTR10 is the 40° bearing on the same 10 dimension section. Both are related sizes rather than substitutions, because ring material and contact angle each change the ratings. SKF’s BSD 80125 shares the 80 x 125 envelope but is a 60° ball-screw-support bearing, a different type at a different angle. The searchable forms include 80BAR10STYNDBELP4A, 80BAR10-STYN-DBEL-P4A, 80BAR10 STYN DB EL P4A and 80BAR10S.