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: 440, 6 3/4 in Nominal Inside Dia., 7 1/4 in Nominal Outside Dia., 70 Shore A, Red, 2 PK O-Ring: 338, 3 1/8 in Nominal Inside Dia., 3 1/2 in Nominal Outside Dia., 75 Shore A, Black O-Ring: 155, 4 in Nominal Inside Dia., 4 3/16 in Nominal Outside Dia., 75 Shore A, Brown, 2 PK O-Ring: 125, 1 5/16 in Nominal Inside Dia., 1 1/2 in Nominal Outside Dia., 70 Shore A, Black, 25 PK O-Ring: 322, 1 1/4 in Nominal Inside Dia., 1 5/8 in Nominal Outside Dia., 90 Shore A, Black, 10 PK O-Ring: 26 mm Nominal Inside Dia., 32 mm Nominal Outside Dia., 32 mm Actual Outside Dia., 5 PK O-Ring: 032, 1 7/8 in Nominal Inside Dia., 2 in Nominal Outside Dia., 90 Shore A, Black, Inch, 25 PK O-Ring Assortment: SAE, Buna N, 1,050 Pieces, 12 # of Sizes, 70 Shore A Backup Ring: Hytrel, For 129, 0.045 in Thick, Black, 50 PK O-Ring: 108, 1/4 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 50 Shore A, Red, 25 PK O-Ring: 377, 10 in Nominal Inside Dia., 10 3/8 in Nominal Outside Dia., 90 Shore A, Black O-Ring: 337, 3 in Nominal Inside Dia., 3 3/8 in Nominal Outside Dia., 70 Shore A, Red, 50 PK O-Ring: 149, 2 13/16 in Nominal Inside Dia., 3 in Nominal Outside Dia., 70 Shore A, Black, 10 PK Backup Ring, Contoured: Buna N, For 111, 0.053 in Thick, 0.129 in Radius, 100 PK O-Ring: 108, 1/4 in Nominal Inside Dia., 7/16 in Nominal Outside Dia., 70 Shore A, Red, Inch, 10 PK O-Ring: 416, 3 3/8 in Nominal Inside Dia., 3 7/8 in Nominal Outside Dia., 3.9 in Actual Outside Dia. O-Ring: 241, 3 7/8 in Nominal Inside Dia., 4 1/8 in Nominal Outside Dia., 75 Shore A, Brown, 5 PK O-Ring: 33.7 mm Nominal Inside Dia., 40.7 mm Nominal Outside Dia., 75 Shore A, Black, 10 PK O-Ring: 180 mm Nominal Inside Dia., 184 mm Nominal Outside Dia., 184 mm Actual Outside Dia., 2 PK O-Ring: 12.7 mm Nominal Inside Dia., 15.8 mm Nominal Outside Dia., 70 Shore A, Green, 50 PK ◀◀ ◀ ▶ ▶▶
