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: 18 mm Nominal Inside Dia., 22 mm Nominal Outside Dia., 22 mm Actual Outside Dia., 5 PK O-Ring: 7.6 mm Nominal Inside Dia., 12.4 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 100 PK O-Ring: 332, 2 3/8 in Nominal Inside Dia., 2 3/4 in Nominal Outside Dia., 50 Shore A, Black, 5 PK O-Ring: 248, 4 3/4 in Nominal Inside Dia., 15/16 in Nominal Outside Dia., 90 Shore A, Black, 5 PK O-Ring: 393, 24 in Nominal Inside Dia., 24 3/8 in Nominal Outside Dia., 24.36 in Actual Outside Dia. O-Ring: 200 mm Nominal Inside Dia., 212 mm Nominal Outside Dia., 212 mm Actual Outside Dia., Black Backup Ring, Contoured: Buna N, For 043, 0.049 in Thick, 0.087 in Radius, 50 PK O-Ring: 50 mm Nominal Inside Dia., 56 mm Nominal Outside Dia., 56 mm Actual Outside Dia., Std, 5 PK O-Ring: 015, 9/16 in Nominal Inside Dia., 11/16 in Nominal Outside Dia., 75 Shore A, Brown, 100 PK O-Ring: 120, 1 in Nominal Inside Dia., 1 3/16 in Nominal Outside Dia., 55 Shore D, White, 10 PK O-Ring: 209, 11/16 in Nominal Inside Dia., 15/16 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 908, 1/2 in Nominal Outside Dia., 0.818 in Actual Outside Dia., 90 Shore A, Black, 100 PK O-Ring: 113, 9/16 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 70 Shore A, Blue, Inch, 5 PK O-Ring: 36 mm Nominal Inside Dia., 41 mm Nominal Outside Dia., 41 mm Actual Outside Dia., 10 PK X-Ray and Metal Detectable O-Ring: 130, 5/8 in Nominal Inside Dia., 13/16 in Nominal Outside Dia. O-Ring: 38 mm Nominal Inside Dia., 46 mm Nominal Outside Dia., 46 mm Actual Outside Dia., 25 PK O-Ring: 004, 3/64 in Nominal Inside Dia., 13/64 in Nominal Outside Dia., 0.21 in Actual Outside Dia. O-Ring: 118, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 70 Shore A, Black, 100 PK O-Ring: 108, 1/4 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 70 Shore A, Black, FDA, 25 PK O-Ring: 80 mm Nominal Inside Dia., 84 mm Nominal Outside Dia., 84 mm Actual Outside Dia., 10 PK ◀◀ ◀ ▶ ▶▶