Description: SG20 bearings are specially guide wheel and pulley wheel for textile machine. Dual-row, pre-lubricated, normal accuracy, low noise and smooth. With small friction and high-limit speed, these u groove pulley bearings are cost-effective and require little maintenance. Chromium Steel (GCr15) made with heat treating, provides high and uniform hardness, good wear resistance, and high contact fatigue performance. Suitable for furniture hardware accessories, mobile doors, glass sliding doors, aluminum doors and windows, shower pulleys and drawers, etc. Specification:Model: SG20Sealed Type: Double SealedInner Race/Outer Race Material: Chrome SteelCage Material: SteelInner Diameter (d): 6mmOuter Diameter (D): 24mmInner Race Thickness (B): 12.75mmOuter Race Thickness (C): 11mmGroove Width (C): 6.5mmGroove Depth: 1.75mmFit Lead Rail Dia.: 8mmAccuracy Class: P0 (ABEC-1)Noise Level: Z1Number of Pack: 1 Pcs