O-Ring Size Finder

Size an O-ring from one photo. Lay one ring flat next to a ruler or a widely recognized coin, shoot from above, and get a report you can take to a parts counter. The report includes: • Inside diameter, cross-section, and outside diameter • The closest AS568 or metric size • Compatible replacement sizes • Other sizes the photo still allows • How sure the reading is: high, medium, or low • A parts-counter summary you can text or email Made for mechanics, technicians, plumbers, and anyone replacing a seal when the package is gone. A useful photo: • One O-ring, lying flat, not stretched or stacked • A metric ruler or a common coin in the same plane (US quarter, €1, or £1) • Shot from directly above, in even light, on a plain background A phone photo is not a caliper reading. Perspective and a slightly flattened ring can shift the size by a fraction of a millimeter. Confirm inside diameter and cross-section before ordering a seal for pressure, fuel, or other critical equipment. Material, such as NBR, FKM, or EPDM, cannot be read from a photo. Free includes one successful size check every 24 hours. Premium is an auto-renewable subscription that removes the wait. Payment is charged to your Apple ID account at confirmation. The subscription renews unless you turn off auto-renew at least 24 hours before the end of the current period. You can manage or cancel the subscription in Settings > Apple ID > Subscriptions. Your last 30 size checks stay on this device.