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: 015, 9/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 050, 5 1/4 in Nominal Inside Dia., 5 3/8 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 174 mm Nominal Inside Dia., 180 mm Nominal Outside Dia., 180 mm Actual Outside Dia., 5 PK O-Ring: 58 mm Nominal Inside Dia., 64 mm Nominal Outside Dia., 64 mm Actual Outside Dia., 5 PK O-Ring: 340, 3 3/8 in Nominal Inside Dia., 3 3/4 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 223, 1 5/8 in Nominal Inside Dia., 1 7/8 in Nominal Outside Dia., 80 Shore A, Black, 5 PK O-Ring: 27.5 mm Nominal Inside Dia., 31.5 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 82 mm Nominal Inside Dia., 92 mm Nominal Outside Dia., 92 mm Actual Outside Dia., 10 PK O-Ring: 237, 3 3/8 in Nominal Inside Dia., 3 5/8 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 124, 1 1/4 in Nominal Inside Dia., 1 7/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 8 mm Nominal Inside Dia., 11 mm Nominal Outside Dia., 11 mm Actual Outside Dia., 50 PK O-Ring: 153, 3 1/2 in Nominal Inside Dia., 3 11/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK O-Ring: 6 mm Nominal Inside Dia., 9 mm Nominal Outside Dia., 9 mm Actual Outside Dia., Red, 50 PK O-Ring: 128 mm Nominal Inside Dia., 132 mm Nominal Outside Dia., 132 mm Actual Outside Dia., 2 PK O-Ring: 355, 5 1/4 in Nominal Inside Dia., 5 5/8 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 3.1 mm Nominal Inside Dia., 6.3 mm Nominal Outside Dia., 6.3 mm Actual Outside Dia., 25 PK O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 75 Shore A, Blue, 10 PK O-Ring: 31 mm Nominal Inside Dia., 39 mm Nominal Outside Dia., 39 mm Actual Outside Dia., 25 PK O-Ring: 4.2 mm Nominal Inside Dia., 8 mm Nominal Outside Dia., 8 mm Actual Outside Dia., 50 PK O-Ring: 267, 8 1/4 in Nominal Inside Dia., 8 1/2 in Nominal Outside Dia., 80 Shore A, Black ◀◀ ◀ ▶ ▶▶