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: 018, 3/4 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 0.879 in Actual Outside Dia. O-Ring: 4.1 mm Nominal Inside Dia., 7.3 mm Nominal Outside Dia., 7.3 mm Actual Outside Dia., 100 PK O-Ring: 234, 3 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 90 Shore A, Black, 25 PK O-Ring: 110, 3/8 in Nominal Inside Dia., 9/16 in Nominal Outside Dia., 75 Shore A, Black, 5,000 PK O-Ring: 232, 2 3/4 in Nominal Inside Dia., 3 in Nominal Outside Dia., 3.012 in Actual Outside Dia. X-Ray and Metal Detectable O-Ring: 218, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia. O-Ring: 82 mm Nominal Inside Dia., 90 mm Nominal Outside Dia., 90 mm Actual Outside Dia., 75 Shore A O-Ring: 12.5 mm Nominal Inside Dia., 16.1 mm Nominal Outside Dia., 70 Shore A, Red, 25 PK O-Ring: 916, 1/8 in Nominal Inside Dia., 1/4 in Nominal Outside Dia., 70 Shore A, Black, 70 PK O-Ring: 59 mm Nominal Inside Dia., 65 mm Nominal Outside Dia., 65 mm Actual Outside Dia., 2 PK O-Ring: 11.8 mm Nominal Inside Dia., 16.6 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 100 PK O-Ring: 018, 3/4 in Nominal Inside Dia., 7/8 in Nominal Outside Dia., 0.879 in Actual Outside Dia. O-Ring: 263, 7 1/4 in Nominal Inside Dia., 7 1/2 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 12 mm Nominal Inside Dia., 14 mm Nominal Outside Dia., 14 mm Actual Outside Dia., 100 PK Backup Ring, Contoured: Buna N, For 213, 0.05 in Thick, 0.174 in Radius, 100 PK O-Ring: 017, 11/16 in Nominal Inside Dia., 13/16 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 011, 5/16 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 70 Shore A, Natural, 10 PK O-Ring: 4.3 mm Nominal Inside Dia., 9.1 mm Nominal Outside Dia., 9.1 mm Actual Outside Dia., 25 PK O-Ring: 17 mm Nominal Inside Dia., 20 mm Nominal Outside Dia., 20 mm Actual Outside Dia., Std, 25 PK ◀◀ ◀ ▶ ▶▶