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: 26 mm Nominal Inside Dia., 30 mm Nominal Outside Dia., 30 mm Actual Outside Dia., 10 PK O-Ring: 199.5 mm Nominal Inside Dia., 216.3 mm Nominal Outside Dia., 70 Shore A, Black, 2 PK O-Ring: 21 mm Nominal Inside Dia., 24 mm Nominal Outside Dia., 24 mm Actual Outside Dia., 100 PK O-Ring: 452, 11 1/2 in Nominal Inside Dia., 12 in Nominal Outside Dia., 75 Shore A, Brown O-Ring: 190 mm Nominal Inside Dia., 200 mm Nominal Outside Dia., 200 mm Actual Outside Dia., Black O-Ring: 11.3 mm Nominal Inside Dia., 16.1 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 100 PK O-Ring: 018, 3/4 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 70 Shore A, Black, X, 100 PK O-Ring: 920, 3/16 in Nominal Inside Dia., 5/16 in Nominal Outside Dia., 70 Shore A, Black, 60 PK O-Ring: 9 mm Nominal Inside Dia., 11 mm Nominal Outside Dia., 11 mm Actual Outside Dia., Red, 50 PK Backup Ring, Contoured: Buna N, For 437, 0.117 in Thick, 0.344 in Radius, 10 PK O-Ring: 232, 2 3/4 in Nominal Inside Dia., 3 in Nominal Outside Dia., 70 Shore A, Black, Inch, 10 PK O-Ring: 340, 3 3/8 in Nominal Inside Dia., 3 3/4 in Nominal Outside Dia., 70 Shore A, Red, 25 PK O-Ring: 5 mm Nominal Inside Dia., 7 mm Nominal Outside Dia., 7 mm Actual Outside Dia., Black, 100 PK O-Ring: 238, 3 1/2 in Nominal Inside Dia., 3 3/4 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 314, 3/4 in Nominal Inside Dia., 1 1/8 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 35 mm Nominal Inside Dia., 40 mm Nominal Outside Dia., 40 mm Actual Outside Dia., Std, 50 PK O-Ring: 463, 17 in Nominal Inside Dia., 17 1/2 in Nominal Outside Dia., 70 Shore A, Red, Inch, 2 PK O-Ring: 165, 6 1/2 in Nominal Inside Dia., 6 11/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 014, 1/2 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Blue, Inch, 5 PK O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 70 Shore A, Black, 20,000 PK ◀◀ ◀ ▶ ▶▶