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: 23 mm Nominal Inside Dia., 28 mm Nominal Outside Dia., 28 mm Actual Outside Dia., 50 PK O-Ring: 046, 4 1/4 in Nominal Inside Dia., 4 3/8 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 901, 0.09375 in Actual Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 905, 5/16 in Nominal Outside Dia., 0.558 in Actual Outside Dia., 90 Shore A, Black, 100 PK O-Ring: 221, 1 7/16 in Nominal Inside Dia., 1 11/16 in Nominal Outside Dia., 70 Shore A, Inch, 25 PK O-Ring: 012, 3/8 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 104.4 mm Nominal Inside Dia., 110.6 mm Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 22 mm Nominal Inside Dia., 25 mm Nominal Outside Dia., 25 mm Actual Outside Dia., Red, 25 PK O-Ring: 10 mm Nominal Inside Dia., 15 mm Nominal Outside Dia., 15 mm Actual Outside Dia., Red, 25 PK O-Ring: 21 mm Nominal Inside Dia., 23 mm Nominal Outside Dia., 23 mm Actual Outside Dia., 100 PK O-Ring: 13 mm Nominal Inside Dia., 17 mm Nominal Outside Dia., 17 mm Actual Outside Dia., 100 PK O-Ring: 46 mm Nominal Inside Dia., 49 mm Nominal Outside Dia., 49 mm Actual Outside Dia., Std, 5 PK O-Ring: 169.5 mm Nominal Inside Dia., 186.3 mm Nominal Outside Dia., 70 Shore A, Black, 2 PK O-Ring: 014, 1/2 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 236, 3 1/4 in Nominal Inside Dia., 3 1/2 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 17 mm Nominal Inside Dia., 25 mm Nominal Outside Dia., 25 mm Actual Outside Dia., 25 PK O-Ring: 28 mm Nominal Inside Dia., 38 mm Nominal Outside Dia., 38 mm Actual Outside Dia., Red, 5 PK O-Ring: 114, 5/8 in Nominal Inside Dia., 13/16 in Nominal Outside Dia., 55 Shore D, White, 25 PK O-Ring: 15 mm Nominal Inside Dia., 20 mm Nominal Outside Dia., 20 mm Actual Outside Dia., 75 Shore A O-Ring: 157, 4 1/2 in Nominal Inside Dia., 4 11/16 in Nominal Outside Dia., 75 Shore A, Blue ◀◀ ◀ ▶ ▶▶