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: 35.7 mm Nominal Inside Dia., 42.7 mm Nominal Outside Dia., 42.7 mm Actual Outside Dia. O-Ring: 78 mm Nominal Inside Dia., 86 mm Nominal Outside Dia., 86 mm Actual Outside Dia., 10 PK O-Ring: 19 mm Nominal Inside Dia., 24 mm Nominal Outside Dia., 24 mm Actual Outside Dia., 25 PK O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 75 Shore A, Brown, 50 PK O-Ring: 72 mm Nominal Inside Dia., 75 mm Nominal Outside Dia., 75 mm Actual Outside Dia., Std, 5 PK O-Ring: 024, 1 1/8 in Nominal Inside Dia., 1 1/4 in Nominal Outside Dia., 80 Shore A, Black, 10 PK O-Ring: 318, 1 in Nominal Inside Dia., 1 3/8 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 117, 13/16 in Nominal Inside Dia., 1 in Nominal Outside Dia., 70 Shore A, Blue, 5 PK O-Ring: 444, 7 3/4 in Nominal Inside Dia., 8 1/4 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 6 mm Nominal Inside Dia., 12 mm Nominal Outside Dia., 12 mm Actual Outside Dia., 25 PK O-Ring: 263, 7 1/4 in Nominal Inside Dia., 7 1/2 in Nominal Outside Dia., 75 Shore A, Brown, 2 PK O-Ring: 11 mm Nominal Inside Dia., 17 mm Nominal Outside Dia., 17 mm Actual Outside Dia., Std, 10 PK O-Ring: 346, 4 1/8 in Nominal Inside Dia., 4 1/2 in Nominal Outside Dia., 70 Shore A, Black, X, 5 PK O-Ring: 125, 1 5/16 in Nominal Inside Dia., 1 1/2 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 448, 9 1/2 in Nominal Inside Dia., 10 in Nominal Outside Dia., 70 Shore A, Black, Inch, 2 PK O-Ring: 230 mm Nominal Inside Dia., 240 mm Nominal Outside Dia., 240 mm Actual Outside Dia., Black O-Ring: 112, 1/2 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 75 Shore A, Black, 25 PK O-Ring: 163, 6 in Nominal Inside Dia., 6 3/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 269, 8 3/4 in Nominal Inside Dia., 9 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 63 mm Nominal Inside Dia., 71 mm Nominal Outside Dia., 71 mm Actual Outside Dia., 20 PK ◀◀ ◀ ▶ ▶▶