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: 419, 3 3/4 in Nominal Inside Dia., 4 1/4 in Nominal Outside Dia., 70 Shore A, Red O-Ring: 99.4 mm Nominal Inside Dia., 105.6 mm Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 13.5 mm Nominal Inside Dia., 17.5 mm Nominal Outside Dia., 75 Shore A, Black, 25 PK O-Ring: 20 mm Nominal Inside Dia., 25 mm Nominal Outside Dia., 25 mm Actual Outside Dia., X, 5 PK O-Ring: 229, 2 3/8 in Nominal Inside Dia., 2 5/8 in Nominal Outside Dia., 70 Shore A, Red, 25 PK O-Ring: 3.5 mm Nominal Inside Dia., 6.5 mm Nominal Outside Dia., 6.5 mm Actual Outside Dia., 100 PK O-Ring: 16 mm Nominal Inside Dia., 19 mm Nominal Outside Dia., 19 mm Actual Outside Dia., Red, 50 PK O-Ring: 9 mm Nominal Inside Dia., 11 mm Nominal Outside Dia., 11 mm Actual Outside Dia., 50 PK O-Ring: 15.1 mm Nominal Inside Dia., 18.3 mm Nominal Outside Dia., 70 Shore A, Black, 100 PK Backup Ring, Contoured: Buna N, For 165, 0.053 in Thick, 0.129 in Radius, 10 PK O-Ring: 8 mm Nominal Inside Dia., 11 mm Nominal Outside Dia., 11 mm Actual Outside Dia., Red, 50 PK O-Ring: 115, 11/16 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 70 Shore A, Red, Inch, 5 PK Backup Ring: Hytrel, For 16, 0.045 in Thick, Black, 50 PK O-Ring: 22 mm Nominal Inside Dia., 27 mm Nominal Outside Dia., 27 mm Actual Outside Dia., 10 PK O-Ring: 452, 11 1/2 in Nominal Inside Dia., 12 in Nominal Outside Dia., 90 Shore A, Black, Inch O-Ring: 451, 11 in Nominal Inside Dia., 11 1/2 in Nominal Outside Dia., 90 Shore A, Black O-Ring: 13 mm Nominal Inside Dia., 17 mm Nominal Outside Dia., 17 mm Actual Outside Dia., 25 PK Backup Ring, Contoured: Buna N, For 272, 0.05 in Thick, 0.174 in Radius, 5 PK O-Ring: 172, 8 1/4 in Nominal Inside Dia., 8 7/16 in Nominal Outside Dia., 90 Shore A, Black, 2 PK Backup Ring, Contoured: Buna N, For 248, 0.05 in Thick, 0.174 in Radius, 25 PK ◀◀ ◀ ▶ ▶▶
