NTN7211CDBGNP4Angular Contact Ball Bearing Matched Pair – 55 mm ID, 100 mm OD, 21 mm Width Each, 42 mm Pair, Open, 15° Contact Angle, Back-to-Back, Normal Preload, ABEC 7

Product Description

What this part is:

NTN 7211CDBGNP4 is a super-precision angular contact ball bearing supplied as a factory matched pair in back-to-back (DB) arrangement. Bore 55 mm, outside diameter 100 mm, width 21 mm per bearing, 42 mm across the pair. Unit Quantity: 2 Pcs.

Decoding the designation:

72 — ISO 72 dimension series, light section.

11 — bore code, 11 x 5 = 55 mm.

C — 15° contact angle in the NTN scheme.

DB — back-to-back duplex arrangement.

GN — normal preload (NTN ladder: GL light, GN normal, GM medium, GH heavy).

P4 — ISO class 4 precision, equivalent to ABEC 7.

Specifications:

Bore Diameter: 55 mm. Outside Diameter: 100 mm. Width: 21 mm per bearing. Total Width: 42 mm across the pair. Contact Angle: 15°. Arrangement: Back-to-back (DB). Preload: Normal (GN). Precision Class: P4 / ABEC 7. Closure Type: Open. Rolling Elements: Steel balls. Material: High carbon chrome steel.

Dynamic Load Rating: 53.0 kN per bearing; 86 kN per pair. Static Load Rating: 40.0 kN per bearing; 80 kN per pair. Limiting Speed: 11,400 rpm grease; 14,700 rpm oil. Load Centre: 20.9 mm per bearing. Item Weight: 0.590 kg (1.30 lb) per bearing. Operating Temperature: −40 °C to 120 °C.

Dimensions and mounting:

Shaft Shoulder Diameter da: 63.5 mm minimum. Shaft Shoulder Diameter db: 60.5 mm minimum. Housing Shoulder Diameter Da: 91.5 mm maximum. Housing Shoulder Diameter Db: 94.5 mm maximum. Fillet Radius r: 1.5 mm. Fillet Radius r1: 1.0 mm. Inner Ring Land Diameter d1: 69.0 mm. Outer Ring Land Diameter D2: 92.3 mm. Bore Type: Straight. Preload is ground into the ring faces at the factory.

Compatibility and replacement:

Cross-references: SKF 7211 CD/P4ADGA (universally matchable pair), FAG B7211-C-T-P4S-UL (universally matchable), NSK 7211CTRDULP4 (duplex, light preload). The NTN designation is also written 7211C/DBGNP4, 7211 C DB GN P4 and 7211-C-DB-GN-P4.

Frequently asked questions:

What size is the NTN 7211CDBGNP4?

Bore 55 mm, outside diameter 100 mm, width 21 mm per bearing; the matched pair is 42 mm wide.

What do DB and GN mean in 7211CDBGNP4?

DB is a back-to-back duplex arrangement and GN is normal preload.

What are the load ratings of the pair?

Dynamic 86 kN and static 80 kN per pair; 53.0 kN and 40.0 kN per single bearing.