Koyo7011C-5GLP4Super-Precision Angular Contact Ball Bearing – 55 mm ID, 90 mm OD, 18 mm Width, Open, 15°, Light Preload, ABEC 7

Product Description

What this part is: Koyo 7011C-5GLP4 super-precision angular contact ball bearing. Bore: 55 mm. Outside diameter: 90 mm. Width: 18 mm. Series: 7000. Base number: 7011. Single row, open, chrome steel rings and balls. The carton also carries the Fafnir designation 2MM9111 for the same bearing. Searchable forms include 7011C-5GLP4, 7011C5GLP4, 7011-C-5GL-P4-FG, 7011C-5GLFGP4 and 2MM9111. Decoding the designation: Contact Angle: 15°, from the C position in Koyo’s scheme, and confirmed independently by the Fafnir 2MM prefix on the same carton. Cage: injection-moulded polyamide resin, from the FG position. Preload: light, from the GL position. Precision Class: ISO P4 / ABEC 7. What these specs mean in practice: A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why it is the standard machine tool spindle angle. Dynamic Load Rating: 38 kN (8,540 lbf). Static Load Rating: 32.5 kN (7,300 lbf). Limiting Speed: 15,000 rpm. Operating temperature: –30 to +120 °C. Mass: 1.85 lb. A moulded polyamide cage is the lightest of the super-precision cage options, which lowers cage-driven friction and lets the bearing accelerate hard. ISO P4 tolerances give tighter running accuracy and lower running vibration than standard class. Lubricant: oil. Quantity and configuration: One bearing, ground for universal matching, so any two pieces of this designation pair back-to-back, face-to-face or in tandem and reach the light preload by clamping the rings. Fitting notes: Rings are clamped solid against the shaft shoulder and the housing shoulder. Because the light preload is ground into the ring faces, this bearing carries no radial internal clearance class. Interchange guidance: Equivalents at the same envelope, angle, precision class and preload: SKF 7011 CDGA/P4A, FAG B7011-C-T-P4S-UL, NSK 7011CTYNSULP4, Fafnir 2MM9111WI-DUL. The 7011C-5GLP5 is the same bearing to the looser P5 class. The 7011C-5GLX2FGP4 carries an additional X2 order code and is a related size rather than a straight substitution.