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: 10 mm Nominal Inside Dia., 16 mm Nominal Outside Dia., 16 mm Actual Outside Dia., 100 PK O-Ring: 339.5 mm Nominal Inside Dia., 356.3 mm Nominal Outside Dia., 356.3 mm Actual Outside Dia. O-Ring: 21.5 mm Nominal Inside Dia., 27.5 mm Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 86 mm Nominal Inside Dia., 90 mm Nominal Outside Dia., 90 mm Actual Outside Dia., 10 PK O-Ring: 254, 5 1/2 in Nominal Inside Dia., 5 3/4 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 166, 6 3/4 in Nominal Inside Dia., 6 15/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 129, 1 9/16 in Nominal Inside Dia., 1 3/4 in Nominal Outside Dia., 70 Shore A, Natural, 2 PK O-Ring: 257, 5 7/8 in Nominal Inside Dia., 6 1/8 in Nominal Outside Dia., 70 Shore A, Red, Inch O-Ring: 9.8 mm Nominal Inside Dia., 13.31 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 264, 7 1/2 in Nominal Inside Dia., 7 3/4 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 22 mm Nominal Inside Dia., 27 mm Nominal Outside Dia., 27 mm Actual Outside Dia., Std, 50 PK O-Ring: 135 mm Nominal Inside Dia., 143 mm Nominal Outside Dia., 143 mm Actual Outside Dia., 2 PK O-Ring: 437, 6 in Nominal Inside Dia., 6 1/2 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 012, 3/8 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 0.504 in Actual Outside Dia. O-Ring: 214, 1 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 90 Shore A, Black, Inch, 10 PK O-Ring: 472, 23 in Nominal Inside Dia., 23 1/2 in Nominal Outside Dia., 23.49 in Actual Outside Dia. O-Ring: 417, 3 1/2 in Nominal Inside Dia., 4 in Nominal Outside Dia., 4.025 in Actual Outside Dia. O-Ring: 214, 1 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 80 Shore A, Black, Inch, 5 PK O-Ring: 4 mm Nominal Inside Dia., 8 mm Nominal Outside Dia., 8 mm Actual Outside Dia., Black, 50 PK O-Ring: 55 mm Nominal Inside Dia., 65 mm Nominal Outside Dia., 65 mm Actual Outside Dia., Std, 20 PK ◀◀ ◀ ▶ ▶▶