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. ◀◀ ◀ ▶ ▶▶ Backup Ring: Hytrel, For 126, 0.045 in Thick, Black, 50 PK O-Ring: 903, 7/23 in Nominal Inside Dia., 3/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 338, 3 1/8 in Nominal Inside Dia., 3 1/2 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 146, 2 5/8 in Nominal Inside Dia., 2 13/16 in Nominal Outside Dia., 50 Shore A, Black, 25 PK O-Ring: 3.7 mm Nominal Inside Dia., 5.7 mm Nominal Outside Dia., 5.7 mm Actual Outside Dia., 50 PK O-Ring: 4.9 mm Nominal Inside Dia., 8.7 mm Nominal Outside Dia., 8.7 mm Actual Outside Dia., 50 PK O-Ring: 125 mm Nominal Inside Dia., 137 mm Nominal Outside Dia., 137 mm Actual Outside Dia., 2 PK O-Ring: 234, 3 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 70 Shore A, Black, Inch, 2 PK O-Ring: 029, 1 1/2 in Nominal Inside Dia., 1 5/8 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 135 mm Nominal Inside Dia., 139 mm Nominal Outside Dia., 139 mm Actual Outside Dia., 5 PK O-Ring: 903, 3/16 in Nominal Outside Dia., 0.429 in Actual Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 253, 5 3/8 in Nominal Inside Dia., 5 5/8 in Nominal Outside Dia., 75 Shore A, Blue O-Ring: 20 mm Nominal Inside Dia., 29 mm Nominal Outside Dia., 29 mm Actual Outside Dia., 25 PK O-Ring: 69.5 mm Nominal Inside Dia., 75.5 mm Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 94.6 mm Nominal Inside Dia., 106 mm Nominal Outside Dia., 106 mm Actual Outside Dia., Black O-Ring: 12.3 mm Nominal Inside Dia., 17.1 mm Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 19 mm Nominal Inside Dia., 26 mm Nominal Outside Dia., 26 mm Actual Outside Dia., 100 PK O-Ring: 26 mm Nominal Inside Dia., 34 mm Nominal Outside Dia., 34 mm Actual Outside Dia., 75 Shore A Backup Ring, Contoured: Buna N, For 022, 0.049 in Thick, 0.087 in Radius, 100 PK O-Ring: 345, 4 in Nominal Inside Dia., 4 3/8 in Nominal Outside Dia., 70 Shore A, Black, Inch, 25 PK ◀◀ ◀ ▶ ▶▶
