There are two main o-ring sizing types. Standard was developed for use in the USA, while the international community uses metric for their o-ring dimensions.
Size - 1.14(29mm) Outside Diameter, 0.87(22mm) Inner Diameter, 0.14(3.5mm) Cross-Section Diameter. Temperature - Silicone O-rings can be used
uxcell Silicone O-Ring, 29mm OD, 22mm ID, 3.5mm Width, VMQ Seal Rings Gasket, Red, Pack of 10
Seal & Design Manufacturer & Distributor of Custom Sealing Products
O-Ring Size Chart for U.S. & Metric Standard Sizes
O-Rings Sizes I.D. ( Standard / Custom Size Charts )-CNL SEALS
STATIC FACE or FLANGE o-ring seals Designs, and Gland Dimensions
O-Rings – Orange Seal
Groove Design: O-Ring Seals - Minnesota Rubber & Plastics
O-rings and back-up rings
How To Measure An O-ring Size
O Rings - an overview