MRC1907RDB#3Angular Contact Ball Bearing – 35 mm ID, 55 mm OD, 10 mm Width, 20 mm Total Width, Open, 15 ° Contact Angle, Back-to-Back Duplex Pair

Product Description

What this part is

MRC 1907RDB#3 angular contact ball bearing set. Envelope: 35 mm bore × 55 mm outside diameter × 10 mm width per bearing. Stacked total width for the pair: 20 mm. Series: 1900 extremely light. Contact angle: 15°. Closure: open. Rolling elements: balls. Material: chrome steel.

Decoding the designation

Base number: 1907. Bore code 07 gives a 35 mm bore. Type letter R sets the 15° contact angle and a counterbored outer ring. Execution code DB is a back-to-back duplex pair. Precision Class: Class 3. Searchable forms: 1907RDB#3, 1907 R DB 3, 1907-R-DB-3, 1907RDB3.

What these specs mean in practice

A 15° contact angle carries less thrust and more speed than a 40° angle, and the extremely light 1900 section keeps the outside diameter close to the shaft for compact spindle envelopes. Class 3 precision buys tighter running and dimensional tolerance, lower running vibration, and closer shaft location than a standard-class bearing. Limiting speed on the record: 15000 rpm. Dynamic load rating: 13.5 kN. Static load rating: 10 kN.

Quantity and configuration

Two pieces ship, a factory back-to-back duplex pair. Back-to-back execution sets the two contact-angle lines diverging outward, which gives a wide effective support spread and takes thrust in both directions with high moment stiffness. The pair is ground for preload as a matched set. Carton arrangement code: DB.

Fitting notes

Mounting arrangement: back-to-back. Bore type: straight. Cage material: phenolic. Internal clearance: N/A — DB duplex grinding sets preload, so a running-clearance class carries no meaning on this bearing. Lubricant: oil. Operating temperature range on the record: −30 °C to 120 °C.

Interchange guidance

The MRC 19nn series maps to ISO 719nn, so 1907R corresponds to the ISO 71907 dimension series at 35 × 55 × 10 mm. Genuine interchanges at 15° in a back-to-back pair: SKF 71907 CD/DB and FAG 71907-C-DB. ISO base number for search: 71907.

Origin

Country of origin: United States. Condition: new. Harmonization code: 8482.10.50.28.