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: 217, 1 3/16 in Nominal Inside Dia., 1 7/16 in Nominal Outside Dia., 70 Shore A, 2 PK O-Ring: 207, 9/16 in Nominal Inside Dia., 13/16 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 11.6 mm Nominal Inside Dia., 16.4 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 4.3 mm Nominal Inside Dia., 9.1 mm Nominal Outside Dia., 9.1 mm Actual Outside Dia., 100 PK O-Ring: 29.2 mm Nominal Inside Dia., 35.2 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 94.4 mm Nominal Inside Dia., 100.6 mm Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 118, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 50 Shore A, Black, 25 PK O-Ring: 390, 21 in Nominal Inside Dia., 21 3/8 in Nominal Outside Dia., 70 Shore A, Black O-Ring: 14 mm Nominal Inside Dia., 24 mm Nominal Outside Dia., 24 mm Actual Outside Dia., 25 PK O-Ring: 007, 5/32 in Nominal Inside Dia., 9/32 in Nominal Outside Dia., 0.285 in Actual Outside Dia. O-Ring: 208, 5/8 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 70 Shore A, Red, 25 PK O-Ring: 6.1 mm Nominal Inside Dia., 9.3 mm Nominal Outside Dia., 9.3 mm Actual Outside Dia., 100 PK O-Ring: 237, 3 3/4 in Nominal Inside Dia., 3 5/8 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 4.5 mm Nominal Inside Dia., 6.5 mm Nominal Outside Dia., 6.5 mm Actual Outside Dia., 50 PK O-Ring: 49/64 in Nominal Inside Dia., 0.937 in Actual Outside Dia., 55 Shore D, White, 50 PK O-Ring: 155, 4 in Nominal Inside Dia., 4 3/16 in Nominal Outside Dia., 80 Shore A, Black, 5 PK O-Ring: 233, 2 7/8 in Nominal Inside Dia., 3 1/8 in Nominal Outside Dia., 60 Shore A, White, 2 PK O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK Backup Ring, Contoured: Buna N, For 036, 0.049 in Thick, 0.087 in Radius, 50 PK ◀◀ ◀ ▶ ▶▶