Barden2124HDHMatched Duplex Angular Contact Ball Bearing Set – 120 mm ID, 180 mm OD, 28 mm Width, Open, 25°, Heavy Preload, ABEC 7

Product Description

What this part is

Barden 2124HDH matched duplex super-precision angular contact ball bearing set. Bore: 120 mm. Outside diameter: 180 mm. Width: 28 mm per bearing. Series: Barden 2100. Single row per bearing, open, chrome steel rings and balls. Searchable forms of the designation include 2124HDH, 2124-HDH, 2124 HDH and the ISO cross 7124.

Decoding the designation

Bore: 120 mm. In the Barden 2100 series the bore code is multiplied by five, so code 24 gives a 120 mm bore, matching the 120 x 180 x 28 mm envelope. Arrangement: matched duplex pair, from the HD position. Preload: heavy, from the trailing H. Contact Angle: 25°. Precision Class: ABEC 7 / ISO P4.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° bearing, which suits spindles that take heavy axial cutting loads. Heavy preload adds axial and radial stiffness and holds shaft position under reversing load. Dynamic Load Rating: 102 kN (22,930 lbf). Static Load Rating: 101 kN (22,705 lbf). Limiting Speed: 8,000 rpm. The machined phenolic cage is light and quiet at speed and runs to 120 °C. ABEC 7 tolerances give tighter running accuracy and lower running vibration than standard class.

Quantity and configuration

Two pieces, supplied as a factory-matched duplex set. Ring faces are ground as a pair so the heavy preload is achieved by clamping the two bearings together against their shoulders. Total width across the pair: 56 mm.

Fitting notes

Preload is ground into the ring faces, so this set carries no radial internal clearance class. The two bearings are kept together and mounted in the orientation marked on their outer ring faces. Lubricant: oil.

Interchange guidance

Equivalents at the same envelope, angle and heavy preload: SKF 7024 ACD/P4ADGC, Fafnir 3MM9124WI-DUH. The 7024 CD forms are a related size at 15° and carry different thrust and speed figures. The 2124HDL and 2124HDM forms are the same envelope at light and medium preload.