The Parker Size Gauge for O-Rings is a uniquely marked plastic cone with special cross-section measuring base and a separate pi tape. The device is used for checking any sample O-Ring up to eight (8.00") inches in diameter to determine the nearest standard.
NOTE: The device does not measure actual dimensions. Proper identification and markings appear on the cone and tape, making the device easy to read. The cone and tape are sold as a set.

The Cone Measures Standard Sized O-Rings:

  • -001 through -041 O-Rings
  • -110 through -151 O-Rings
  • -210 through -235 O-Rings
  • -325 through -337 O-Rings

The Tape Measures Standard Sized O-Rings:

  • -042 through -050 O-Rings
  • -152 through -171 O-Rings
  • -235 through -266 O-Rings
  • -338 through -369 O-Rings
  • -425 through -445 O-Rings