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. ◀◀ ◀ ▶ ▶▶ Backup Ring, Contoured: Buna N, For 390, 0.076 in Thick, 0.262 in Radius, 2 PK O-Ring: 46 mm Nominal Inside Dia., 53 mm Nominal Outside Dia., 53 mm Actual Outside Dia., 10 PK O-Ring: 5.5 mm Nominal Inside Dia., 10.5 mm Nominal Outside Dia., 10.5 mm Actual Outside Dia., 25 PK O-Ring: 8 mm Nominal Inside Dia., 16 mm Nominal Outside Dia., 16 mm Actual Outside Dia., 50 PK O-Ring: 332, 2 3/8 in Nominal Inside Dia., 2 3/4 in Nominal Outside Dia., 90 Shore A, Inch O-Ring: 226, 2 in Nominal Inside Dia., 2 1/4 in Nominal Outside Dia., 90 Shore A, Black, Inch, 5 PK O-Ring: 99 mm Nominal Inside Dia., 107 mm Nominal Outside Dia., 107 mm Actual Outside Dia., 10 PK O-Ring: 22 mm Nominal Inside Dia., 26 mm Nominal Outside Dia., 26 mm Actual Outside Dia., Std, 10 PK O-Ring: 216, 1 1/8 in Nominal Inside Dia., 1 3/8 in Nominal Outside Dia., 75 Shore A, Brown, 25 PK O-Ring: 905, 5/16 in Nominal Outside Dia., 0.558 in Actual Outside Dia., 90 Shore A, Black, 25 PK Backup Ring: Hytrel, For 248, 0.045 in Thick, Black, 25 PK O-Ring: 139, 2 3/16 in Nominal Inside Dia., 2 3/8 in Nominal Outside Dia., 50 Shore A, Black, 25 PK O-Ring: 9.1 mm Nominal Inside Dia., 12.3 mm Nominal Outside Dia., 12.3 mm Actual Outside Dia., 25 PK O-Ring: 243, 4 1/8 in Nominal Inside Dia., 4 3/8 in Nominal Outside Dia., 75 Shore A, Brown, 5 PK O-Ring: 379, 11 in Nominal Inside Dia., 11 3/8 in Nominal Outside Dia., 90 Shore A, Black O-Ring: 37 mm Nominal Inside Dia., 43 mm Nominal Outside Dia., 43 mm Actual Outside Dia., Std, 25 PK O-Ring: 76 mm Nominal Inside Dia., 84 mm Nominal Outside Dia., 84 mm Actual Outside Dia., 10 PK O-Ring: 109, 5/16 in Nominal Inside Dia., 1/2 in Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 909, 9/16 in Nominal Outside Dia., 0.9 in Actual Outside Dia., 90 Shore A, Black, 25 PK Backup Ring, Contoured: Buna N, For 208, 0.05 in Thick, 0.174 in Radius, 100 PK ◀◀ ◀ ▶ ▶▶
