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: 97 mm Nominal Inside Dia., 101 mm Nominal Outside Dia., 101 mm Actual Outside Dia., 10 PK O-Ring: 70 mm Nominal Inside Dia., 80 mm Nominal Outside Dia., 80 mm Actual Outside Dia., 75 Shore A O-Ring: 027, 1 5/16 in Nominal Inside Dia., 1 7/16 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 120, 1 in Nominal Inside Dia., 1 3/16 in Nominal Outside Dia., 70 Shore A, Black, X, 100 PK O-Ring: 7.5 mm Nominal Inside Dia., 10.5 mm Nominal Outside Dia., 10.5 mm Actual Outside Dia., Black O-Ring: 235, 3 1/8 in Nominal Inside Dia., 3 3/8 in Nominal Outside Dia., 75 Shore A, Black O-Ring: 7.8 mm Nominal Inside Dia., 11.6 mm Nominal Outside Dia., 11.6 mm Actual Outside Dia., 10 PK O-Ring: 111, 7/16 in Nominal Inside Dia., 5/8 in Nominal Outside Dia., 70 Shore A, Blue, 5 PK Backup Ring, Contoured: Buna N, For 443, 0.117 in Thick, 0.344 in Radius, 10 PK O-Ring: 49 mm Nominal Inside Dia., 59 mm Nominal Outside Dia., 59 mm Actual Outside Dia., 10 PK O-Ring: 311, 9/16 in Nominal Inside Dia., 15/16 in Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 13.9 mm Nominal Inside Dia., 17.5 mm Nominal Outside Dia., 70 Shore A, Green, 50 PK O-Ring: 126, 1 3/8 in Nominal Inside Dia., 1 9/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 97 mm Nominal Inside Dia., 105 mm Nominal Outside Dia., 105 mm Actual Outside Dia., 10 PK O-Ring: 236, 3 1/4 in Nominal Inside Dia., 3 1/2 in Nominal Outside Dia., 85 Shore A O-Ring: 59 mm Nominal Inside Dia., 67 mm Nominal Outside Dia., 67 mm Actual Outside Dia., 25 PK O-Ring: 16 mm Nominal Inside Dia., 19 mm Nominal Outside Dia., 19 mm Actual Outside Dia., Std, 50 PK O-Ring: 49 mm Nominal Inside Dia., 54 mm Nominal Outside Dia., 54 mm Actual Outside Dia., Std, 5 PK O-Ring: 39 mm Nominal Inside Dia., 47 mm Nominal Outside Dia., 47 mm Actual Outside Dia., 25 PK O-Ring: 35 mm Nominal Inside Dia., 47 mm Nominal Outside Dia., 47 mm Actual Outside Dia., 5 PK ◀◀ ◀ ▶ ▶▶