Home / Product / Angular Contact Ball Bearings

Angular Contact Ball Bearing QJ309N2MA/C2L SKF

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.

Industry Expertise
Global Reach
OEM/ODM Services

Get a Free Quote +86-510-6831-3099 fonkin-industries@188.com 8618751551686

Product Introduction
Detailed Parameters
Message Us

The QJ309N2MA/C2L SKF is a high‑precision four‑point contact ball bearing engineered by SKF for combined radial and bidirectional axial load applications. Featuring C2 ultra‑small radial clearance, N2 notch positioning and machined brass cage, it delivers rigid positioning, high‑speed stability and outstanding anti‑tilting performance for precision transmission systems with strict clearance requirements.
Dimensional parameters comply with ISO 1229 standard: inner diameter 45 mm, outer diameter 100 mm, width 25 mm, chamfer 1.5×45°, tolerance class P0, radial clearance C2. Equipped with outer‑ring locating notches, it enables precise axial positioning in compact assemblies.
Inner and outer rings are manufactured from high‑purity 100Cr6 vacuum‑refined bearing steel, quenched to HRC 61–63 with excellent wear resistance, contact fatigue strength and dimensional stability. Precision steel balls use the same high‑grade bearing steel. The MA solid brass cage provides superior thermal stability, low friction and long‑term reliability under high‑speed continuous operation.
Key manufacturing processes include precision forging, CNC turning, vacuum heat treatment, raceway grinding and superfinishing. Forging optimizes metal fiber flow; heat treatment eliminates residual stress; superfinishing achieves ultra‑low surface roughness, minimizing friction and improving high‑speed running performance.
Calculated per ISO 281 standard, the QJ309N2MA/C2L SKF achieves a rated L10 service life of 64 000 hours under standard load, steady speed and proper lubrication. Service life is mainly affected by combined load magnitude, operating speed, alignment accuracy, lubrication quality and temperature.
This four‑point contact bearing is widely used in machine tool spindles, wind turbine gearboxes, heavy‑duty gear units, railway transmission systems and precision automation equipment. Its bidirectional axial‑radial load capacity and C2 tight clearance make it ideal for precision positioning and high‑speed rotating applications.
Maintenance requires lubrication every 300 operating hours with high‑speed lithium‑based extreme‑pressure grease. Keep mating surfaces clean from contaminants; regularly check noise, temperature and backlash, replacing components upon abnormal wear or play.
Before installation, clean shafts and housings and verify H7/h6 tolerance. Use press‑fit assembly without hammer impact, control coaxiality within 0.02 mm/m and apply standard tightening torque. Conduct no‑load test run post‑installation to confirm smooth rotation and stable positioning.

BRAND	FONKIN/SKF/FAG/INA/NSK/NTN/TIMKEN/SNR/IKO/KOYO/ASAHI/FYH/THK/HIWIN/PMI
BEARINGS NO.	QJ309N2MA/C2L SKF
TYPE	Angular Contact Ball Bearings
Inner(d)mm	45
Outer(D)mm	100
Width(B)mm	25
WEIGHT/KG	1.05
EAN CODE	7316570 296549

Tel

+86-510-6831-3099

E-mail

fonkin-industries@188.com

Address

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

All the fields are required. By sending the form you agree to the Terms & Conditions