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: 4 mm Nominal Inside Dia., 8 mm Nominal Outside Dia., 8 mm Actual Outside Dia., Black, 25 PK O-Ring: 115, 11/16 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 12 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., 25 PK O-Ring: 010, 1/4 in Nominal Inside Dia., 3/8 in Nominal Outside Dia., 75 Shore A, Brown, 100 PK O-Ring: 40 mm Nominal Inside Dia., 46 mm Nominal Outside Dia., 46 mm Actual Outside Dia., Red, 5 PK O-Ring: 117, 13/16 in Nominal Inside Dia., 1 in Nominal Outside Dia., 75 Shore A, Black, 10 PK O-Ring: 168, 7 1/4 in Nominal Inside Dia., 7 7/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 019, 13/16 in Nominal Inside Dia., 15/16 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 240, 3 3/4 in Nominal Inside Dia., 4 in Nominal Outside Dia., 70 Shore A, Black, Inch, 25 PK O-Ring: 32 mm Nominal Inside Dia., 36.8 mm Nominal Outside Dia., 36.8 mm Actual Outside Dia., 25 PK O-Ring: 85 mm Nominal Inside Dia., 92 mm Nominal Outside Dia., 92 mm Actual Outside Dia., 5 PK O-Ring: 6 mm Nominal Inside Dia., 8 mm Nominal Outside Dia., 8 mm Actual Outside Dia., Black, 50 PK O-Ring: 71 mm Nominal Inside Dia., 81 mm Nominal Outside Dia., 81 mm Actual Outside Dia., 75 Shore A O-Ring: 470, 21 in Nominal Inside Dia., 21 1/2 in Nominal Outside Dia., 70 Shore A, Black O-Ring Assortment: SAE, Viton(R), 212 Pieces, 20 # of Sizes, 90 Shore A O-Ring: 168, 7 1/4 in Nominal Inside Dia., 7 7/16 in Nominal Outside Dia., 90 Shore A, Black, 2 PK O-Ring: 117 mm Nominal Inside Dia., 122 mm Nominal Outside Dia., 122 mm Actual Outside Dia., 5 PK O-Ring: 211, 13/16 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 70 Shore A, Red, 5 PK O-Ring: 379, 11 in Nominal Inside Dia., 11 3/8 in Nominal Outside Dia., 90 Shore A, Black, Inch O-Ring: 221, 1 7/16 in Nominal Inside Dia., 1 11/16 in Nominal Outside Dia., 90 Shore A, Inch, Round ◀◀ ◀ ▶ ▶▶