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: 215, 1 1/16 in Nominal Inside Dia., 1 5/16 in Nominal Outside Dia., 70 Shore A, Inch, 100 PK Backup Ring, Contoured: Buna N, For 210, 0.05 in Thick, 0.174 in Radius, 100 PK O-Ring: 234, 3 in Nominal Inside Dia., 3 1/4 in Nominal Outside Dia., 3.262 in Actual Outside Dia. O-Ring: 210, 3/4 in Nominal Inside Dia., 1 in Nominal Outside Dia., 90 Shore A, Black, Inch, 2 PK O-Ring: 310 mm Nominal Inside Dia., 320 mm Nominal Outside Dia., 320 mm Actual Outside Dia., Black O-Ring: 003, 1/16 in Nominal Inside Dia., 3/16 in Nominal Outside Dia., 75 Shore A, Brown, 100 PK O-Ring: 12 mm Nominal Inside Dia., 22 mm Nominal Outside Dia., 22 mm Actual Outside Dia., Std, 10 PK O-Ring: 51 mm Nominal Inside Dia., 56 mm Nominal Outside Dia., 56 mm Actual Outside Dia., 2 PK X-Ray and Metal Detectable O-Ring: 210, 3/4 in Nominal Inside Dia., 1.01 in Actual Outside Dia. O-Ring: 17.5 mm Nominal Inside Dia., 21.5 mm Nominal Outside Dia., 70 Shore A, Black, 50 PK O-Ring: 270 mm Nominal Inside Dia., 280 mm Nominal Outside Dia., 280 mm Actual Outside Dia., Black O-Ring: 275 mm Nominal Inside Dia., 283 mm Nominal Outside Dia., 283 mm Actual Outside Dia., Black O-Ring: 17.8 mm Nominal Inside Dia., 22.6 mm Nominal Outside Dia., 70 Shore A, Black, Metric, 100 PK O-Ring: 242, 4 in Nominal Inside Dia., 4 1/4 in Nominal Outside Dia., 70 Shore A, Black, 5 PK O-Ring: 021, 15/16 in Nominal Inside Dia., 1 1/16 in Nominal Outside Dia., 75 Shore A, Black O-Ring: 114, 5/8 in Nominal Inside Dia., 13/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK O-Ring: 38 mm Nominal Inside Dia., 48 mm Nominal Outside Dia., 48 mm Actual Outside Dia., Std, 10 PK O-Ring: 194 mm Nominal Inside Dia., 198 mm Nominal Outside Dia., 198 mm Actual Outside Dia., 2 PK O-Ring Assortment: Metric, Buna N, 426 Pieces, 32 # of Sizes, 70 Shore A O-Ring: 150, 2 7/8 in Nominal Inside Dia., 3 1/16 in Nominal Outside Dia., 70 Shore A, Black, 10 PK ◀◀ ◀ ▶ ▶▶