this is exactly the same size as any 6205 ball bearing
HLH16X15S Airtac Compact Slide Air Cylinder
The Bearings part number is B7203-C-T-P4S-UL and This bearing has the following Dimensions: B7203 C T P4S UL 17x40x12 mm
Acting Type Double Acting Airtac tacq Guided Compact Air Cylinder Airtac Product Series Airtac TACQ Guided Compact Air Cylinder Bore Size 63mm Brand Airtac Component Type Guided Air Cylinder Magnet Without Magnet Stroke Length 100mm Thread Type G
Cylindrical Roller Follower
SDA100X20ST Airtac SDA Compact Air Cylinder, Double Acting Super Precision Angular Contact Spindle Bearing this is exactly the sameSDA100X20ST Airtac SDA Compact Air Cylinder, Double Acting Compact pneumatic cylinder, double acting, 100mm Bore, 20mm Stroke, with Magnet, Female thread, NPT thread type Product Info Acting Type Double Acting Airtac sda series Compact Air Cylinder Product Series Airtac SDA Compact Air Cylinder Bore Size 100mm Brand Airtac Component Type Compact Air Cylinder Magnet With Magnet Rod Type Female Thread Stroke Length 20mm Type of Thread NPT