NSK7005A5TYDUMP4Super-Precision Angular Contact Ball Bearing Duplex Pair — 25 mm ID, 47 mm OD, 12 mm Width, Open, 25°, Medium Preload, Polyamide Cage

Product Description

What this part is

A matched duplex pair of NSK 7005A5TYDUMP4 super-precision angular contact ball bearings. Each bearing has a 25 mm bore, 47 mm outside diameter and 12 mm width, is open on both faces and runs a straight bore. The pair is universally ground with medium preload built in.

Decoding the designation

7005 identifies an angular contact ball bearing in the ISO 70 light series with a 25 mm bore. In the NSK scheme A5 sets a 25° contact angle. TY denotes a ball-guided polyamide cage. DU marks the bearings as a universally ground duplex set and the following M sets medium preload. P4 is the precision class, equivalent to ABEC 7.

What these specs mean in practice

A 25° contact angle carries more thrust and gives greater axial stiffness than a 15° bearing in the same envelope, at the cost of a lower speed ceiling. Medium preload adds rigidity over a light-preload set with correspondingly higher friction and heat generation, which suits work where positional stiffness governs. The polyamide cage is light and quiet and tolerates high cage speeds. P4 accuracy controls bore, outside diameter and running runout to super-precision tolerances.

Load and speed data

Dynamic and static load ratings, limiting speed and temperature limits are published in the specification table on this page.

Quantity and configuration

Two bearings, supplied as a matched universal duplex set. Each is single row and open, with no snap ring, seals or shields.

Fitting notes

Universal grinding allows assembly back-to-back, face-to-face or in tandem. A back-to-back or face-to-face arrangement locates the shaft axially in both directions and develops the built-in medium preload as the rings are clamped; tandem mounting shares thrust in one direction only. A single row alone takes thrust in one direction. The set is matched and stays together as supplied. Polyamide cages are kept clear of solvents and of temperatures above their ceiling.

Interchange guidance

A substitution needs the same 25° angle, the same medium preload and the same P4 class. A 7005 with a 15° angle, a light or heavy preload letter, or a lower precision class shares the 25 x 47 x 12 mm envelope but is a related size rather than an equivalent. Same-spec designations from other manufacturers are listed in the cross-reference table.