NTN7210CT1GDLP4Super-Precision Angular Contact Ball Bearing Duplex Pair – Straight Bore, 50 mm ID, 90 mm OD, 20 mm Width, Open, 15° Contact Angle, ABEC 7, Light Preload, 2 Pcs

Product Description

What this part is

NTN 7210CT1GDLP4 super-precision angular contact ball bearing set, 72 dimension 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. Total Width: 40 mm across the pair. Bore Type: Straight. Number Of Rows: 1 per bearing. Rolling Elements: Steel balls. Closure Type: Open. Contact Angle: 15°. Precision Class: JIS Class 4, equal to ABEC 7. Preload: Light. Cage Material: Phenol resin. Cage Type: Machined. Design Units: Metric. Material: High-carbon chrome bearing steel. Country of Origin: Japan.

Decoding the designation

7210: the 72 dimension series with a 50 mm bore. C: 15° contact angle in NTN’s own key, which gives C for 15°, AD for 25° and no symbol for 30°. T1: machined phenol resin cage. G: flush ground, so the faces are ground for universal matching. D: universally matched for duplex assembly. L: light preload, NTN’s GL class. P4: JIS Class 4. Searchable variants: 7210C, 7210C-T1-G-DL-P4, 7210C T1 G DL P4, 7210CT1GDLP4/B7, 7210CT1GD2/GLP4.

What these specs mean in practice

Dynamic Load Rating, two-row set: 69,500 N (15,624 lbf). Static Load Rating, two-row set: 63,500 N (14,275 lbf). Standard Preload at the GL class for a 50 mm bore, 72C type: 98 N. Item Weight: 0.445 kg (0.98 lb) per bearing, 0.890 kg (1.97 lb) per set. Operating Temperature Range: -40 °C to 120 °C. A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why it dominates high-speed spindle work. The machined phenol resin cage is light and runs quietly, and flush-ground faces let any two bearings of the designation be clamped to a known preload without shimming. Lubricant: grease or oil.

Quantity and configuration

Unit Quantity: 2 Pcs. Mounting Arrangement: universally matched duplex, for back-to-back, face-to-face or tandem assembly. Internal Clearance: N/A — face grinding sets the axial position on a flush-ground preloaded set, in place of a radial clearance class.

Fitting notes

Diameter of Shaft Abutment: 57.0 mm minimum, and 54.5 mm on the second face. Diameter of Housing Abutment: 83.0 mm maximum, and 85.5 mm on the second face. Maximum Shaft or Housing Fillet Radius: 1.0 mm, and 0.6 mm on the second face. Chamfer Dimension: 1.1 mm and 0.6 mm.

Interchange guidance

Same-specification equivalents: Fafnir 2MM210WI-DUL, NSK 7210CTRDULP4, SKF 7210 CD/P4ADGA, FAG B7210-C-T-P4S-UL, RHP 7210CTDULP4. A 7210AD execution shares the 50 x 90 x 20 mm envelope at a 25° contact angle, which is a related size rather than a substitution.