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Angular Contact Ball Bearing 234438-M-SP FAG

The FAG 234438-M-SP is a high‑precision, double‑direction thrust angular contact ball bearing designed for heavy axial loads, high rigidity, and precision spindle applications. As a premium FAG precision thrust bearing, it features a 60° contact angle, separable construction, and SP special precision grade, delivering exceptional accuracy and reliability for high‑performance industrial systems.

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The FAG 234438-M-SP is a high‑precision, double‑direction thrust angular contact ball bearing designed for heavy axial loads, high rigidity, and precision spindle applications. As a premium FAG precision thrust bearing, it features a 60° contact angle, separable construction, and SP special precision grade, delivering exceptional accuracy and reliability for high‑performance industrial systems.
Compliant with ISO 281 and DIN standards, its exact dimensions: bore 190 mm, outer diameter 290 mm, total width 120 mm, outer ring width 60 mm, minimum chamfer 2.1 mm (rmin), and SP precision grade (tolerance class). Additional key parameters: contact angle 60°, basic dynamic axial load rating 246 kN, static axial load rating 940 kN, limiting speed (grease) 1,900 rpm.
Critical components use high‑grade bearing materials. Inner/outer rings and balls are manufactured from 100Cr6 high‑carbon chromium steel, hardened to HRC 60–64 for superior wear resistance, contact fatigue strength, and dimensional stability. The M suffix indicates a solid brass cage, ensuring precise ball guidance, low noise, and excellent thermal stability at high speeds.
Core production processes include precision forging, CNC turning, vacuum heat treatment (quenching/tempering), raceway grinding, and superfinishing. Strict process control minimizes surface roughness (Ra ≤ 0.02 μm) and geometric errors, enhancing operational smoothness and extending service life for the FAG 234438-M-SP.
Service life is calculated per ISO 281. Under standard axial load and clean lubrication, the L10 life exceeds 25,000 hours. Key factors affecting life include actual load magnitude, alignment accuracy, lubrication condition, operating temperature, and environmental cleanliness.
This high‑precision FAG thrust bearing is widely used in CNC machine tool spindles, heavy‑duty machining centers, precision grinding machines, and high‑speed industrial gearboxes. Its double‑direction design supports bidirectional axial forces, while the SP grade ensures tight runout and high rotational accuracy—ideal for precision metal removal applications.
For maintenance, use NLGI 2 extreme‑pressure lithium grease with 30–40% cavity fill. Relubricate every 500 operating hours. Keep mounting surfaces free of contaminants; regularly check temperature (≤80°C), vibration, and noise. Replace the bearing if abnormal wear, scoring, or cage damage occurs.
During installation, clean shafts/housings thoroughly. Use thermal or press assembly; avoid direct hammer blows. Control alignment error within 0.04 mm, apply specified torque, and run a 30‑minute no‑load test to verify smooth rotation. Proper installation prevents premature failure and ensures consistent precision.

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI
BEARINGS NO.	234438-M-SP FAG
TYPE	Angular Contact Ball Bearings
Inner(d)mm	190
Outer(D)mm	290
Width(B)mm	120
WEIGHT/KG	24.7
EAN CODE	4012801 487948

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