NSK50BTR10 ETYN DTD P4A TRIPLEXAngular Contact Thrust Ball Bearings – 50 mm ID, 80 mm OD, 14.3 mm Width, 40° Contact Angle, Open, Triplex Tandem Set of Three

Product Description

What this part is

NSK 50BTR10ETYNDTDP4A angular contact thrust ball bearings. Bore: 50 mm. Outside diameter: 80 mm. Width: 14.3 mm (9/16 in) each. Series: BTR. Open, straight bore, polyamide ball-guided cage. Supplied as a triplex tandem set of three.

Decoding the designation

50: 50 mm bore. BTR: NSK’s angular contact thrust series at a 40° contact angle. 10E: series and design designation. TYN: polyamide cage, ball guided. DTD: three-row tandem matched set. P4A: NSK class 4 accuracy.

What these specs mean in practice

Basic dynamic axial load rating: 17.4 kN. Basic static axial load rating: 31.5 kN. Permissible axial load: 19.3 kN. Limiting speed at extra-light preload: 10,800 rpm on grease, 14,000 rpm on oil-air; at light preload, 9,200 rpm on grease and 11,900 rpm on oil-air. A 40° contact angle puts most of the load line along the shaft axis, which is what makes this series an axial-load and axial-stiffness bearing rather than a radial one. Three rows in tandem share that axial load across three ball complements, so the set carries roughly three times what a single row does in the loaded direction.

Quantity and configuration

Three pieces, 3 Pcs, a factory triplex tandem set. Total stack width 42.8 mm. Mass 0.272 kg per bearing.

Fitting notes

Straight bore, open. Tandem rows all face the same direction, so the set takes thrust one way and runs against an opposing bearing for the return direction. Set pieces mount in the order and orientation marked on their faces, clamped between a shaft shoulder and a locknut.

Interchange guidance

NSK 50BAR10E is the same 50 mm bore size in the BAR series at a 30° contact angle, a related size rather than a substitution. NSK 50TAC100B is the ball-screw support family at 60° on a different envelope. Searchable forms: 50BTR10ETYNDTDP4A, 50BTR10 ETYN DTD P4A, 50BTR10E, 50BTR10.