Fafnir2MM215WICRDUMAngular Contact Ball Bearing – 75 mm ID, 130 mm OD, 25 mm Width, 15° Contact Angle, Medium Preload Duplex Pair, ABEC 7/9

Product Description

What this part is

Fafnir 2MM215WI-CR-DUM super-precision angular contact ball bearing, 200WI spindle series, 75 x 130 x 25 mm. Timken world part number 7215C-T-P4S-DUM. Bore Diameter: 75 mm. Outside Diameter: 130 mm. Overall Width: 25 mm per bearing. Total Width: 50 mm for the mounted pair. Contact Angle: 15°. Precision Class: ABEC 7/9 / P4S. Cage Type: Outer-ring land riding. Cage Material: Phenolic. Rolling Elements: Ball. Bearing Material: Chrome steel. Bore Type: Straight. Closure Type: Open. Design Units: Metric.

Decoding the designation

2 — 15° contact angle.

MM — Fafnir super-precision spindle execution, ISO P4S tolerance class.

215 — 200 series, bore code 15, giving a 75 mm bore.

WI — low shoulder on both rings, the spindle bearing form.

CR — phenolic outer land riding cage.

DUM — duplex pair, medium preload.

What these specs mean in practice

Dynamic Load Rating: 87,900 N per bearing. Static Load Rating: 64,900 N. Limiting Speed: 10,800 rpm grease; 21,600 rpm oil. Lubricant: grease or oil.

A 15° contact angle favours rotational speed over thrust capacity, giving the 21,600 rpm oil figure. Medium preload sits between the light and heavy grades: more stiffness than light, lower heat generation than heavy. Preload and internal clearance are mutually exclusive, so Internal Clearance: N/A.

The cage is guided on the outer ring land rather than on the balls, which steadies it at high speed. Phenolic absorbs and releases lubricant, suiting continuous spindle duty.

Mounting data

Shaft Backing Shoulder Diameter: 85.2 mm (3.360 in). Housing Backing Shoulder Diameter: 120.8 mm (4.760 in). Maximum housing fillet radius that the bearing corners will clear: 1.5 mm (0.059 in). Outer ring to-clear radius: 1.5 mm (0.059 in).

Quantity and configuration

Unit Quantity: 2 Pcs. Number Of Rows: 1 per bearing, 2 rows per set. Mounting Arrangement: duplex pair, medium preload. Rows per set: duplex. The pair is ground as a matched set and stacks to 50 mm on the shaft seat.

Interchange guidance

Timken 7215C-T-P4S-DUM, SKF 7215 CD/P4ADGB, FAG B7215-C-T-P4S-DUM, NSK 7215CTRDUMP4 and RHP 7215CTDUMP4 share the 75 x 130 x 25 mm envelope, the 15° angle, P4S tolerance and medium preload. A standard-precision 7215C matches the envelope and the angle at a looser tolerance class.