Barden2210HDMSuper-Precision Angular Contact Ball Bearing Duplex Pair – Straight Bore, 50 mm ID, 90 mm OD, 20 mm Width, Open, 25° Contact Angle, P4S, Medium Preload, 2 Pcs

Product Description

What this part is

Barden 2210HDM super-precision angular contact ball bearing set, 200 metric series, 50 mm bore x 90 mm outside diameter x 20 mm width per bearing. Bore: 50 mm. Outside Diameter: 90 mm. Overall Width: 20 mm. Bore Type: Straight. Number Of Rows: 1 per bearing. Rolling Elements: Steel balls. Closure Type: Open. Contact Angle: 25°. Precision Class: P4S. Preload: Medium. Cage Material: Reinforced phenolic. Cage Type: One-piece halo design. Design Units: Metric. Material: 100Cr6 bearing steel rings, steel balls. Country of Origin: United States.

Decoding the designation

2210: the Barden 200 metric series in its 25° execution, giving a 50 mm bore on the ISO 7210 envelope. H: non-separable relieved outer ring, which carries the reinforced phenolic one-piece halo cage. D: duplex pair, universal mounting. M: medium preload. Searchable variants: 2210-HDM, 2210 HD M, 2210H, 7210, 7210A5, 7210ACD, 3MM7210WI-CR-DUM.

What these specs mean in practice

Dynamic Load Rating: 39,660 N. Static Radial Load Rating: 32,911 N. Limiting Speed, oil lubrication: 21,000 rpm. Limiting Speed, grease lubrication: 14,000 rpm. Preload Force at medium class: 885 N. Axial Rigidity at medium class: 209.07 N/µm. Unloading Force at medium class: 2,672.91 N. A 25° contact angle carries more thrust and gives higher axial rigidity than a 15° execution of the same envelope, at the cost of top speed. Medium preload holds axial position more tightly than light, which suits work where the thrust direction reverses. The one-piece halo phenolic cage is light and stiff, and it keeps ball spacing stable through speed changes. Lubricant: grease or oil.

Quantity and configuration

Unit Quantity: 2 Pcs. A universally mountable duplex pair, so the two bearings assemble back-to-back, face-to-face or in tandem and reach medium preload when clamped. Internal Clearance: N/A — face grinding sets the axial position on a universally mountable preloaded pair, in place of a radial clearance class.

Fitting notes

Maximum Corner Radius, thrust side: 1.00 mm. Maximum Corner Radius, non-thrust side: 0.50 mm.

Interchange guidance

Same-specification equivalents carried on the carton: Fafnir 3MM7210WI-CR-DUM, NSK 7210A5, SKF 7210 ACD, RHP 7210ETDUMP4. The 15° sibling in Barden’s own scheme is the 210H, which shares the 50 x 90 x 20 mm envelope at a different contact angle and is a related size rather than a substitution.