Standard AS568 O-ring
AS568-257 O-Ring, 5.859 x 0.139 in (148.82 x 3.53 mm)
The AS568-257 O-ring (dash 257, also written 2-257) has an inside diameter of 5.859 in (148.82 mm), a cross section of 0.139 in (3.53 mm), nominal 1/8 inch, and an outside diameter of 6.137 in (155.88 mm). We supply it in Buna-N (nitrile), Viton (FKM), EPDM or Silicone, in packs of 10, 25 and 100.
Size
| AS568 size | -257 |
|---|---|
| Inside diameter (ID) | 5.859 in (148.82 mm) |
| Cross section (CS) | 0.139 in (3.53 mm), nominal 1/8 in |
| Outside diameter (OD) | 6.137 in (155.88 mm) |
Rubber and pack prices
| Rubber | 10-pack | 25-pack | 100-pack |
|---|---|---|---|
| Buna-N (nitrile) 70AGood for water, air and petroleum oils; the usual choice for filter housings. | $5.99 | $12.99 | Request a quote |
| Viton (FKM) 75AGood for heat, fuels and many chemicals. | $23.99 | $66.99 | Request a quote |
| EPDM 70AGood for hot water, steam and chlorinated or chloraminated water. | $9.99 | $22.99 | Request a quote |
| Silicone 70A (orange)Good for a wide temperature range and food-contact use. | $11.99 | $26.99 | Request a quote |
A size match is not a fit claim for your equipment. Some sizes ship from stock; others have a 2-3 business day lead time before they ship. Not for oxygen, medical, aviation, scuba or other safety-critical use.