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: 21.3 mm Nominal Inside Dia., 26.1 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 2.5 mm Nominal Inside Dia., 5.5 mm Nominal Outside Dia., 5.5 mm Actual Outside Dia., Black O-Ring: 382, 13 in Nominal Inside Dia., 13 3/8 in Nominal Outside Dia., 90 Shore A, Black Backup Ring: Hytrel, For 332, 0.065 in Thick, Orange, 25 PK O-Ring: 239, 3 5/8 in Nominal Inside Dia., 3 7/8 in Nominal Outside Dia., 75 Shore A, Brown, 5 PK O-Ring: 51 mm Nominal Inside Dia., 56 mm Nominal Outside Dia., 56 mm Actual Outside Dia., Std, 25 PK O-Ring: 30 mm Nominal Inside Dia., 34 mm Nominal Outside Dia., 34 mm Actual Outside Dia., 10 PK O-Ring: 149, 2 13/16 in Nominal Inside Dia., 3 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 2.7 mm Nominal Inside Dia., 4.7 mm Nominal Outside Dia., 4.7 mm Actual Outside Dia., 50 PK O-Ring: 76 mm Nominal Inside Dia., 88 mm Nominal Outside Dia., 88 mm Actual Outside Dia., 2 PK O-Ring: 170, 7 3/4 in Nominal Inside Dia., 7 15/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 33 mm Nominal Inside Dia., 35 mm Nominal Outside Dia., 35 mm Actual Outside Dia., 25 PK O-Ring: 278, 12 in Nominal Inside Dia., 12 1/4 in Nominal Outside Dia., 75 Shore A, Brown O-Ring: 31.6 mm Nominal Inside Dia., 36.4 mm Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 036, 2 3/8 in Nominal Inside Dia., 2 1/2 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 25 mm Nominal Inside Dia., 30 mm Nominal Outside Dia., 30 mm Actual Outside Dia., Red, 25 PK O-Ring: 206, 1/2 in Nominal Inside Dia., 3/4 in Nominal Outside Dia., 0.762 in Actual Outside Dia. O-Ring: 68 mm Nominal Inside Dia., 75 mm Nominal Outside Dia., 75 mm Actual Outside Dia., 5 PK O-Ring: 14 mm Nominal Inside Dia., 18 mm Nominal Outside Dia., 18 mm Actual Outside Dia., 100 PK O-Ring: 164 mm Nominal Inside Dia., 172 mm Nominal Outside Dia., 172 mm Actual Outside Dia., 2 PK ◀◀ ◀ ▶ ▶▶
