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: 111, 7/16 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 0.63 in Actual Outside Dia. O-Ring: 175 mm Nominal Inside Dia., 187 mm Nominal Outside Dia., 187 mm Actual Outside Dia., Black O-Ring: 902, 1/8 in Nominal Outside Dia., 0.367 in Actual Outside Dia., 75 Shore A, Black, 25 PK O-Ring: 021, 15/16 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 75 Shore A, Brown, 50 PK O-Ring: 16 mm Nominal Inside Dia., 22 mm Nominal Outside Dia., 22 mm Actual Outside Dia., 25 PK O-Ring: 67 mm Nominal Inside Dia., 71 mm Nominal Outside Dia., 71 mm Actual Outside Dia., 25 PK O-Ring: 204, 3/8 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Red, 25 PK O-Ring: 205, 7/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 70 Shore A, Red, Inch, 5 PK O-Ring: 4 mm Nominal Inside Dia., 6.4 mm Nominal Outside Dia., 6.4 mm Actual Outside Dia., 50 PK O-Ring: 213, 15/16 in Nominal Inside Dia., 1 3/16 in Nominal Outside Dia., 50 Shore A, Red, 25 PK O-Ring: 018, 3/4 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 75 Shore A, Black, Inch, 5 PK O-Ring: 250 mm Nominal Inside Dia., 256 mm Nominal Outside Dia., 256 mm Actual Outside Dia., 5 PK O-Ring: 16 mm Nominal Inside Dia., 20 mm Nominal Outside Dia., 20 mm Actual Outside Dia., X, 10 PK O-Ring: 109, 5/16 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 0.505 in Actual Outside Dia. O-Ring: 015, 9/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 75 Shore A, Blue, 10 PK O-Ring: 21.8 mm Nominal Inside Dia., 26.6 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 25 PK O-Ring: 041, 3 in Nominal Inside Dia., 3 1/8 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 40 mm Nominal Inside Dia., 42.4 mm Nominal Outside Dia., 42.4 mm Actual Outside Dia., 25 PK O-Ring: 140, 2 1/4 in Nominal Inside Dia., 2 7/16 in Nominal Outside Dia., 50 Shore A, Black, 25 PK O-Ring: 20 mm Nominal Inside Dia., 22 mm Nominal Outside Dia., 22 mm Actual Outside Dia., 100 PK ◀◀ ◀ ▶ ▶▶