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: 445, 8 in Nominal Inside Dia., 8 1/2 in Nominal Outside Dia., 90 Shore A, Black, Inch, 2 PK O-Ring: 38 mm Nominal Inside Dia., 44 mm Nominal Outside Dia., 44 mm Actual Outside Dia., 10 PK Backup Ring, Contoured: Buna N, For 229, 0.05 in Thick, 0.174 in Radius, 50 PK O-Ring: 104, 1/8 in Nominal Inside Dia., 5/16 in Nominal Outside Dia., 90 Shore A, Black, 50 PK O-Ring: 34.7 mm Nominal Inside Dia., 41.7 mm Nominal Outside Dia., 41.7 mm Actual Outside Dia. Backup Ring, Contoured: Buna N, For 313, 0.076 in Thick, 0.262 in Radius, 100 PK O-Ring: 50 mm Nominal Inside Dia., 57 mm Nominal Outside Dia., 57 mm Actual Outside Dia., 75 Shore A O-Ring: 174, 8 3/4 in Nominal Inside Dia., 8 15/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 23 mm Nominal Inside Dia., 27 mm Nominal Outside Dia., 27 mm Actual Outside Dia., 20 PK O-Ring: 57 mm Nominal Inside Dia., 63 mm Nominal Outside Dia., 63 mm Actual Outside Dia., 25 PK O-Ring: 179 mm Nominal Inside Dia., 185 mm Nominal Outside Dia., 185 mm Actual Outside Dia., 5 PK O-Ring: 3.1 mm Nominal Inside Dia., 6.3 mm Nominal Outside Dia., 6.3 mm Actual Outside Dia., 100 PK O-Ring: 218, 1 1/4 in Nominal Inside Dia., 1 1/2 in Nominal Outside Dia., 75 Shore A, Black, Inch O-Ring: 177, 9 1/2 in Nominal Inside Dia., 9 11/16 in Nominal Outside Dia., 70 Shore A, Red, 10 PK Backup Ring, Contoured: Buna N, For 019, 0.049 in Thick, 0.087 in Radius, 100 PK O-Ring: 431, 5 1/4 in Nominal Inside Dia., 5 3/4 in Nominal Outside Dia., 90 Shore A, Black, 2 PK Backup Ring, Contoured: Buna N, For 041, 0.049 in Thick, 0.087 in Radius, 50 PK Backup Ring, Contoured: Buna N, For 314, 0.076 in Thick, 0.262 in Radius, 100 PK O-Ring: 118, 7/8 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 60 Shore A, White, 5 PK Backup Ring, Contoured: Buna N, For 311, 0.076 in Thick, 0.262 in Radius, 100 PK ◀◀ ◀ ▶ ▶▶
