Fafnir3MM214WIDULSuper Precision Angular Contact Ball Bearing – Straight Bore, 70 mm ID, 125 mm OD, 24 mm Width, Open, 25° Contact Angle, Light Preload, Phenolic Outer-Land-Riding Cage, ISO P4S

Product Description

What this part is: Fafnir 3MM214WI SUL super precision angular contact ball bearing, single row, 200WI spindle series. Manufacturer Part Number: 3MM214WI SUL. World Part Number: 7214E-T-P4S-SUL. Bore: 70 mm. Outside Diameter: 125 mm. Bearing Width: 24 mm. Total Width: 24 mm. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Rolling Elements: Steel balls. Design Units: Metric. Decoding the designation: Contact Angle: 25°, carried by the 3MM prefix. Series: 200WI, the Fafnir spindle angular contact range. Size code 214 carries the ISO 7214 envelope, 70 x 125 x 24 mm. WI: low shoulder on both rings. CR: phenolic outer land riding cage. SU: single universally ground, so any two or more of these bearings stack in any arrangement and arrive at the specified preload. L: light preload. Precision Class: ISO P4S, equivalent to ABEC 7/9. Preload: Light. Mounting Arrangement: Universal single. Published ratings: Dynamic Radial Load Rating – 1M Revs (C1): 80,200 N (18,000 lbf). C1 ISO Dynamic Radial Rating, per row: 72,900 N (16,400 lbf). Static Radial Load Rating (C0): 57,400 N (12,900 lbf). Limiting Speed, grease: 11,300 rpm. Limiting Speed, oil: 20,600 rpm. These are single-bearing figures for the SUL execution. Mounting dimensions: Max Shaft Fillet Radius: 1.5 mm. Outer Ring To Clear Radius: 1.5 mm. Shaft Backing Shoulder Diameter: 80.3 mm. Housing Backing Shoulder Diameter: 115.8 mm. What these specs mean in practice: A 25° contact angle puts more of the load line along the shaft axis, so this bearing is stiffer axially than the 15° execution on the same envelope and holds a spindle nose in position under thrust — boring, drilling, plunge milling, heavy face milling. The trade is speed: a steeper angle raises the centrifugal and gyroscopic work on the ball set, so the limiting speeds sit below those of the 15° part. Light preload is the setting for speed and low heat generation. It gives less axial stiffness than a medium or heavy set and lets the spindle run cooler at the top of its range. Internal Clearance: N/A — a preloaded bearing is set by preload rather than by a clearance class. Cage Type: CR, phenolic outer land riding. Cage Material: Phenolic. A machined phenolic laminate cage is light, so it loads the ball pockets very little at speed, it is self lubricating, and it damps rather than rings. Guidance on the outer ring land keeps it stable at high speed. Its service range suits oil mist, oil air and grease for life spindles. Quantity and configuration: Unit Quantity: 1 Pc. Rows per Set: single. Universal grinding means one bearing runs alone, or several stack back to back, face to face or in tandem and reach the light preload of the set. The carton is factory sealed and the 2 has been crossed to 3MM, which is the 25° prefix. Interchange guidance: Base Number: 7214. MPN Variants: 3MM214WISUL, 3MM214WI SUL, 3MM-214-WI-SUL, 3-MM-214-WI-SUL, 3MM214WIDUL, 3MM214WI, 7214AC. Same-envelope 25° super precision light-preload equivalents are written SKF 7214 ACDGA/P4A, FAG B7214-E-T-P4S-UL and NSK 7214A5. Cage material and precision class vary between makers inside those designations. The line passed from Fafnir to Torrington to Timken, and Timken lists 3MM214WI SUL today.