Fafnir2MM214WI CR DULAngular Contact Ball Bearing – 70 mm ID, 125 mm OD, 24 mm Width, Open, 15° Contact Angle, Light Preload, Matched Pair

Product Description

What this part is:

Fafnir 2MM214WICR-DUL super precision angular contact ball bearings, supplied as a factory-matched back-to-back pair. Series: 200WI. Base Number: 214. Bore Diameter: 70 mm. Outside Diameter: 125 mm. Overall Width: 24 mm per bearing. Contact Angle: 15°. Precision Class: ABEC 7/9 (ISO P4S). Cage Material: Phenolic. Cage Type: Outer Ring Land Riding. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1 per bearing. Preload: Light. Mounting Arrangement: Back-to-back (DUL). Internal Clearance: N/A. GTIN: 087796070837.

Decoding the designation:

2MM — Fafnir super precision execution at a 15° contact angle, built to ISO P4S.

214 — 200WI dimension series at a 70 mm bore. Timken’s world part number for the same bearing is 7214C-T-P4S.

WI — low shoulder on both rings, the form that allows duplex mounting in either direction.

CR — phenolic cage, guided on the outer ring land.

DUL — two bearings universally ground as a matched set, mounted back to back, at light preload.

What these specs mean in practice:

Dynamic Load Rating: 84,200 N per bearing. Static Load Rating: 60,000 N per bearing. Limiting Speed: 11,400 rpm grease; 22,800 rpm oil.

Contact Angle: 15°. A 15° angle favours speed and radial stiffness over thrust capacity, which is why it is the standard spindle angle for high-rpm machine tool work.

Cage Material: Phenolic. A machined fabric-base phenolic cage is light, holds oil in its own structure and runs quietly at spindle speeds. Cage Type: Outer Ring Land Riding, so the cage is piloted on the outer ring bore and stays centred under acceleration.

Preload: Light. A back-to-back light-preload pair takes thrust in both directions and holds axial position under reversing load, with less heat generation than a medium or heavy set.

Precision Class: ABEC 7/9 (ISO P4S). Running accuracy at this class holds shaft position to a few microns.

Mounting data:

Max Housing Fillet Radius: 1.5 mm. Shaft Backing Shoulder Diameter: 80.3 mm. Housing Backing Shoulder Diameter: 115.8 mm.

Quantity and configuration:

Unit Quantity: 2 Pcs. One factory-matched DUL pair, ground to run together back to back at light preload.

Interchange guidance:

The ISO designation for this bearing is 7214C at P4 precision. A matched pair from another maker interchanges where the contact angle is 15°, the precision class is P4 or P4S, the preload is light and the arrangement is back to back. All four have to match for the substitution to behave the same way in a spindle.