Catalog Hardware O-Rings and O-Ring Kits O-rings and O-ring kits help ensure a tight seal to prevent air and fluid leaks in applications such as air conditioner repair or plumbing installations. ◀◀ ◀ ▶ ▶▶ O-Ring: 018, 3/4 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 70 Shore A, Blue, 5 PK O-Ring: 42 mm Nominal Inside Dia., 50 mm Nominal Outside Dia., 50 mm Actual Outside Dia., 25 PK O-Ring: 208, 5/8 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 0.887 in Actual Outside Dia. O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 50 Shore A, Black, 25 PK O-Ring: 285 mm Nominal Inside Dia., 293 mm Nominal Outside Dia., 293 mm Actual Outside Dia., Black O-Ring: 312, 5/8 in Nominal Inside Dia., 1 in Nominal Outside Dia., 75 Shore A, Brown, 10 PK O-Ring: 210, 3/4 in Nominal Inside Dia., 1 in Nominal Outside Dia., 1.012 in Actual Outside Dia. O-Ring: 7.3 mm Nominal Inside Dia., 12.1 mm Nominal Outside Dia., 12.1 mm Actual Outside Dia., 50 PK O-Ring: 159, 5 in Nominal Inside Dia., 5 3/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 26 mm Nominal Inside Dia., 32 mm Nominal Outside Dia., 32 mm Actual Outside Dia., Std, 50 PK O-Ring: 18 mm Nominal Inside Dia., 22 mm Nominal Outside Dia., 22 mm Actual Outside Dia., Std, 50 PK O-Ring: 55 mm Nominal Inside Dia., 61 mm Nominal Outside Dia., 61 mm Actual Outside Dia., Std, 2 PK O-Ring: 36 mm Nominal Inside Dia., 39 mm Nominal Outside Dia., 39 mm Actual Outside Dia., 100 PK O-Ring: 14 mm Nominal Inside Dia., 20 mm Nominal Outside Dia., 20 mm Actual Outside Dia., 25 PK O-Ring: 37 mm Nominal Inside Dia., 45 mm Nominal Outside Dia., 45 mm Actual Outside Dia., 25 PK O-Ring: 124.5 mm Nominal Inside Dia., 130.5 mm Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 224, 1 3/4 in Nominal Inside Dia., 2 in Nominal Outside Dia., 90 Shore A, Black, Inch, 5 PK O-Ring: 12 mm Nominal Inside Dia., 17 mm Nominal Outside Dia., 17 mm Actual Outside Dia., Std, 25 PK O-Ring: 66 mm Nominal Inside Dia., 69 mm Nominal Outside Dia., 69 mm Actual Outside Dia., 25 PK O-Ring: 463, 17 in Nominal Inside Dia., 17 1/2 in Nominal Outside Dia., 90 Shore A, Black, Inch ◀◀ ◀ ▶ ▶▶