61814 Hybrid Ceramic Bearings can be made with chrome 52100 or stainless steel for the inside and outside race along with silicon nitride balls
ACE125X50SBT Airtac ACE Compact Air Cylinder
You can purchase KD047AR0 4
Model = 7207ACDGA/HCP4A 72 = Angular contact ball bearing in accordance with ISO dimension series 02 07 = 35mm bore diameter ACD = 25 deg contact angle
3mm Ring Material 52100 Chrome Steel Ball Material 52100 Chrome Steel Cage Material Brass Dynamic Radial Load 4118 lbs Dynamic Thrust 6499 lbs Dynamic Moment 329 lbs Static Radial Load 7125 lbs Static Thrust 17813 lbs Static Moment 759 lbs Max Speed (X1000 rpm) 0 Lubrication Lubricated Shaft Mount Type Press Fit Temperature Range -30°C to 110 °C ABEC Rating ABEC-1 Radial Clearance 0
HLQ8X30S
Airtac Compact Slide Air Cylinder Axial Cylindrical Roller Bearings 812 61814 Hybrid Ceramic Bearings canHLQ8X30S Airtac Compact Slide Air Cylinder Pneumatic compact slide cylinder, recirculating linear ball bearing, 8mm Bore, 30mm Stroke, with Magnet, without adjuster (basic type), M5 port Acting Type Double Acting Adjuster Option Without Adjuster Basic Type Airtac hlq Slide Table Actuator with Recirculating Linear Ball Bearing Airtac Product Series Airtac HLQ Slide Table Actuator Recirculating Linear Ball Bearing Bore Size 8mm Brand Airtac Component