B7211-E-T-P4S-UL FAG

Angular Contact Ball Bearing Single Row B7211-E-T-P4S-UL FAG

The FAG B7211‑E‑T‑P4S‑UL is a high‑precision single‑row angular contact ball bearing engineered for high‑speed machine tool spindle applications, widely searched for precision spindle bearing, P4S super precision bearing, FAG UL pre‑set bearing for CNC machinery.

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FAG B7211‑E‑T‑P4S‑UL Angular Contact Ball Bearing Technical Datasheet

The FAG B7211‑E‑T‑P4S‑UL is a high‑precision single‑row angular contact ball bearing engineered for high‑speed machine tool spindle applications, widely searched for precision spindle bearing, P4S super precision bearing, FAG UL pre‑set bearing for CNC machinery.
Key dimensional parameters: Bore diameter \(d=55\ \text{mm}\), outer diameter \(D=100\ \text{mm}\), width \(B=21\ \text{mm}\), chamfer dimension \(r_{\text{min}}=1.5\ \text{mm}\). Tolerance grade P4S (super‑precision, tighter than standard P4 ISO 281), contact angle 25° for elevated axial load capacity. UL suffix denotes universal matching for face‑to‑face or back‑to‑back mounting without shim adjustment.
Material specification: Inner ring and outer ring adopt 100Cr6 high‑carbon chromium bearing steel. Rockwell hardness HRC 60‑64, delivering outstanding wear resistance, contact fatigue strength and moderate corrosion resistance. Rolling elements are 100Cr6 steel balls. The phenolic resin fabric laminate (T‑suffix) cage features low friction, high dimensional stability and excellent high‑speed performance, preventing ball skidding under rapid acceleration.
Core manufacturing processes: Raw stock undergoes closed‑die forging to optimise grain flow, followed by precision turning for near‑net shape. Controlled quenching‑tempering heat treatment secures consistent hardness and residual stress control. Raceway grinding and superfinishing produce ultra‑smooth raceway surfaces, minimising vibration, noise and frictional heat, critical for high‑precision running performance.
Service life: Calculated per ISO 281 bearing life standard. Under standard operating conditions: 10 000 rpm, combined radial‑axial load below basic dynamic load rating, nominal \(L_{10}\) life reaches 18 000 operating hours. Service life is influenced by operating speed, load magnitude, lubrication cleanliness, mounting alignment and ambient temperature.
Application industries: Primary deployment in high‑speed CNC machine tool spindles, milling centres, grinding equipment. Also selected for precision automation, semiconductor processing machinery. Its 25‑degree contact angle and P4S precision support combined radial‑axial loads and strict rotational accuracy requirements.
Maintenance guidelines: Perform routine inspection every 800‑1 000 operating hours. Use high‑speed spindle grease or low‑viscosity circulating oil lubricant; fill 25‑35 % of bearing internal free volume. Keep mounting housing and shaft seats free of particles and contamination. Check running temperature, vibration amplitude and noise; shut down equipment immediately upon abnormal thermal rise or rattling noise.
Installation notes: Inspect shaft and housing dimensional tolerance and surface finish before assembly. Maintain strict shaft‑housing alignment to eliminate misalignment stress. Apply specified mounting torque; avoid direct hammer impact on bearing rings. Post‑installation check rotational smoothness, running‑in temperature and run‑out values to validate correct preload condition.

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI
BEARINGS NO.	B7211-E-T-P4S-UL FAG
TYPE	Angular Contact Ball Bearings
Inner(d)mm	55
Outer(D)mm	100
Width(B)mm	21
WEIGHT/KG	0.61
EAN CODE	4012801 616232

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+86-510-6831-3099

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fonkin-industries@188.com

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No.105, Huixin Road,Yuqi Industrial Park, Huishan District, hunqi Road, Yuqi Town, Wuxi, Jiangsu Province, P.R.CHINA

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