NSK7303ATDBP5Angular Contact Bearing Matched DB Pair, 17 x 47 x 14 mm, 30°

Product Description

What this part is:

A matched back-to-back (DB) pair of NSK precision angular contact ball bearings, 17 mm bore, 47 mm outside diameter, 14 mm wide each. Both carry a 30° contact angle, are ground to ISO Class 5 (ABEC 5), and run a phenolic resin cage. Unit Quantity: 2 Pcs, one matched DB pair in the original NSK carton, ring-marked as a set. Country of Origin: Japan.

Decoding the designation:

7303 — single-row angular contact ball bearing, 03 dimension series, bore number 03 = 17 mm bore, 47 mm outside diameter, 14 mm width.

A — 30° contact angle in NSK’s scheme, which runs C = 15°, A5 = 25°, A = 30°.

T — phenolic resin cage. NSK documents T and TR as its phenolic cage options, TR being the outer-ring-guided version.

DB — back-to-back duplex arrangement, the O configuration.

P5 — ISO tolerance class 5, equivalent to ABEC 5.

Specifications:

Bore Diameter: 17 mm. Outside Diameter: 47 mm. Width: 14 mm per bearing. Contact Angle: 30°. Precision Class: P5 (ISO Class 5 / ABEC 5). Cage Material: Phenolic resin. Closure Type: Open. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bearing Material: 52100 Chrome Steel. Series: 7300.

Single-bearing ratings (NSK 7303A envelope): Basic dynamic load rating (Cr): 17,500 N per bearing. Basic static load rating (C0r): 8,650 N per bearing. Limiting speed: 11,000 rpm grease, 15,000 rpm oil-bath. Mass: 0.116 kg per bearing.

Matched back-to-back set values: Basic dynamic load rating (Cr), pair: 28,500 N. Basic static load rating (C0r), pair: 17,300 N. Limiting speed, pair: 9,000 rpm grease, 12,000 rpm oil-bath. Mass: 0.232 kg for the pair.

Dimensions and mounting:

Bore (d): 17 mm. Outside diameter (D): 47 mm. Width (B): 14 mm per bearing. Overall mounted width (2B): 28 mm. Effective load centre (a): 16.2 mm. Load centre spacing (a0): 32.5 mm. Shaft abutment diameter (da min.): 23 mm. Housing abutment (Da max.): 41 mm; Db max.: 42 mm. Chamfers: r min. 1.0 mm, r1 min. 0.6 mm. Fillet ra max.: 1.0 mm; rb max.: 0.6 mm. A DB set takes thrust in both directions from a single bearing station.

Compatibility and replacement:

NSK 7303A5DB — 25° contact angle. NSK 7303AWDB — pressed-steel cage, standard class. FAG 7303-B-XL-JP — 40° angle, standard tolerance. SKF 7303 BECBP — 40° angle. NSK 7303B is the 40° version.

Frequently asked questions:

What does Unit Quantity 2 Pcs mean for this listing?

Two bearings forming one matched back-to-back (DB) pair, ring-marked as a set.

What are the size and contact angle?

Bore Diameter: 17 mm. Outside Diameter: 47 mm. Width: 14 mm per bearing. Contact Angle: 30°.

What do the T and P5 suffixes mean?

T is a phenolic resin cage. P5 is ISO tolerance class 5, equivalent to ABEC 5.