MRC7116KRDTDBAngular Contact Ball Bearing Set – Straight Bore, 80 mm ID, 125 mm OD, 22 mm Section Width, Open, 15° Contact Angle, Back-to-Back Arrangement

Product Description

What this part is

MRC 7116KRDTDB precision angular contact ball bearing set. Bore: 80 mm. Outside diameter: 125 mm. Section width: 22 mm per bearing. Series: 7100K, MRC’s extra-light angular contact section. Contact Angle: 15°. Precision Class: ABEC 7 (P4). Chrome steel balls run on a phenolic cage, rings open on both faces.

Decoding the designation

Series: 7100K, angular contact, extra light. Bore code 16: 80 mm. Type R: 15° contact angle with a counterbored outer ring. DT: matched tandem execution. DB: back-to-back mounting. Precision Class: ABEC 7, equivalent to P4. Searchable forms of the number include 7116KRDTDB, 7116 KR DT DB, 7116KRDTDB ABEC-7 and 7116KRDT.

What these specs mean in practice

A 15° contact angle favours speed and radial rigidity over thrust capacity, which is what carries an 80 mm bore to an 11,000 rpm limiting speed. The counterbored outer ring gives each bearing one high shoulder, so each piece carries thrust in a single direction and the pair covers both. Dynamic Load Rating: 53.0 kN. Static Load Rating: 47.5 kN. ABEC 7 tolerances hold bore, outside diameter and raceway runout to super-precision limits, which is what keeps a spindle running true at speed.

Quantity and configuration

Unit Quantity: 2 Pcs. Total set width: 44 mm. Mounting Arrangement: back-to-back. Faces are flush ground so the pair seats on a common shoulder and takes up its preload on clamp-up. Preload comes from the matched grinding rather than from an internal clearance class.

Fitting notes

Bore Type: straight, 80 mm. Housing bore: 125 mm. Back-to-back mounting sets the load lines divergent, which gives the stiffer moment reaction of the two duplex arrangements and tolerates shaft deflection better than face-to-face. Lubricant: oil or grease. Operating range: −30 °C to 120 °C, the phenolic cage setting the upper figure. Set mass: 4.30 lb.

Interchange guidance

ISO base number: 7016. A same-spec 15° super-precision equivalent is FAG B7016-C-T-P4S-DB. A 29° or 40° bearing on the same 80 x 125 x 22 mm envelope is a related size, carrying a different thrust-to-speed balance. The same envelope in a face-to-face (DF) execution is likewise a related size, since the ground offset and load path differ.

Origin

Country of origin: United States.