P4 Precision Angular Contact Ball Bearing 71914AC 25 Degree High Rigidity Spindle Bearing

The 71914AC is a P4 precision angular contact ball bearing with a 25 degree contact angle, built for spindles that demand rigidity and accuracy. A 70 mm bore, 100 mm outside diameter and 16 mm width deliver a basic dynamic load rating of 31.5 kN and a static rating of 31.0 kN, enough for heavy cutting and stiff preload. The larger 25 degree angle raises axial stiffness, so the bearing resists deflection under thrust load while holding P4 runout for accurate surface finish. It reaches 12000 RPM grease speed and 19000 RPM oil speed, covering demanding turning, milling and grinding spindles.

• P4 Precision Control: Bore, radial runout and face runout are held to P4 limits, reducing vibration and delivering accurate, repeatable surface finish.
• High Rigidity 25 Degree: The 25 degree contact angle raises axial stiffness, resisting deflection under heavy thrust load in precision spindles.
• Strong Load Capacity: A 31.5 kN dynamic rating and 31.0 kN static rating support preloaded, high force cutting conditions without distortion.
• Precision Steel Balls: Grade steel balls provide high rigidity and stable rolling contact for accurate, low vibration rotation.
• Outer Guide Cage: The outer guide phenolic cage tracks balls smoothly, keeping friction and heat low across the working speed range.
• Matched Set Ready: The unit can be combined into DB, DT and DF arrangements to build stiff, accurate spindle bearing clusters.

The 71914AC is specified for precision machine tool spindles in turning centers, milling machines and surface grinders, plus measuring spindles and high accuracy rotary tables. Its high rigidity and P4 accuracy suit jobs that call for tight tolerance and low vibration, such as mold finishing and precision bearing bores. Tool builders use it where a stiff, accurate bearing set is required and speed remains within the 12000 to 19000 RPM range.

Precision bearings are wrapped in anti-rust paper, cushioned with foam and packed in a labeled export carton to resist moisture and impact in transit. Bore, runout, clearance and precision class are verified before packing, and inspection reports can be supplied per batch. Custom preload, matched angular arrangements and grease selection are available for OEM spindle builders, with mixed-model pallet consolidation to lower freight cost.