The ISO 3601 metric-size O-rings quickreference chart lists the O-rings in millimeters, with IDs from 0.74 to 658.88 mm, and cross sections (widths) from 1.02 to 6.99 mm. The O-rings are available in six basic materials — Buna-N, ethylene-propylene, silicone, neoprene, fluorocarbon, and fluorosilicone.

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