NDHAngular Contact Ball Bearing 40 x 80 x 18 mm, Flanged Outer Ring, Tandem Duplex

Product Description

What this part is

An NDH Q20208-DT-L7A angular contact ball bearing with a flanged outer ring: 40 mm bore, 80 mm outside diameter, 18 mm wide, tandem duplex matched. The envelope is the ISO 7208 size.

Decoding the designation

Q: phenolic separator. 20208: NDH’s angular contact dimension series for a 40 mm bore, the ISO 7208 envelope at 40 x 80 x 18 mm. DT: duplex tandem, two rows arranged facing the same direction. L: light preload. 7: ABEC 7 precision class. A: rust-preventive slush coating. The outside diameter carries an integral locating flange.

Specifications

Manufacturer: New Departure Hyatt (NDH). Part Number: Q20208DTL7A. Base Number: Q20208. Bearing Type: angular contact ball bearing, flanged outer ring, tandem duplex. Series: NDH Q20200 angular contact, ISO 7208 envelope. Bore: 40 mm. Outside Diameter: 80 mm. Width: 18 mm. Bore Type: straight. Contact Angle: 15°. Rolling Elements: balls. Cage Material: phenolic. Preload: light. Mounting Arrangement: tandem (DT). Housing Style: flanged outer ring with an integral locating flange on the outside diameter. Closure Type: open. Precision Class: ABEC 7. Basic Dynamic Load Rating: 34.5 kN / 7,756 lbf. Basic Static Load Rating: 24.1 kN / 5,418 lbf. Surface Protection: rust-preventive slush coating. Lubricant: oil. Item Weight: 0.81 lb. Maximum Temperature: 120 °C. Minimum Temperature: -30 °C. Design Units: metric. Harmonization Code: 8482.10.50.28. Country of Origin: United States. Manufacturer Status: NDH is a discontinued brand, supplied as surplus and new old stock.

What these specifications mean in practice

An angular contact ball bearing carries thrust in one direction, because the ball-to-raceway contact line runs at an angle across the bearing and can only be pushed. A tandem arrangement faces both rows the same way, so the two rows share one thrust load and roughly double the axial capacity in that single direction; a back-to-back or face-to-face duplex opposes the rows and takes thrust both ways. The 15° contact angle is a shallow angle that favours speed and radial capacity over pure thrust. The flanged outer ring locates the bearing axially against a machined housing face rather than a shoulder bored into the housing, which shortens the housing and fixes the axial position without shims. The phenolic separator is a light, low-friction, ball-guided cage of the kind used in high-speed spindle service.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing, tandem duplex matched.

Interchange guidance

The ISO envelope is 7208, so 7208-C, SKF 7208 BECBP, FAG 7208-B-XL-TVP and NSK 7208A share the 40 x 80 x 18 mm size; the SKF B and NSK A executions run 40° and 30° contact angles against this bearing’s 15°, and the plain outer rings on all of them locate on a housing shoulder. In super precision at the same envelope and angle, SKF 7208 CDGA/P4A and FAG B7208-C-T-P4S-UL are the closest matches, and the Fafnir equivalent recorded for this part is 2MM208WI CR DUL. A Q20208-DB or -DF in the same NDH series is back-to-back or face-to-face and takes thrust in both directions.