70 Durometer Buna-N O-Ring, Inch OD, 2-5/8 Inch ID, 0.14 Inch Width

Actual I.D.
2.61
Actual O.D.
2.89
Actual Width
0.139 in
Dash Size
-231
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
2-5/8
Nominal O.D.
2-7/8
Nominal Width
1/8
Package Qty.
10
Supplier Part Number
568-231
Alternate Part Numbers
Alternate Part Number C1CE83, Alternate Part Number MI-08740438, Alternate Part Number MINO-00407X90438
Product Weight
0.01 lbs

Product Questions & Answers

What size is this o-ring exactly? I need to make sure it's gonna fit right.
Question by: Ray T on Aug 28, 2025, 4:44 PM
Precisely, this O-ring has an actual inner diameter of 2.609 inches, an outer diameter of 2.887 inches, and a width of 0.139 inches.
Answer by: Customer Support on Aug 29, 2025, 6:55 PM
What size is this O-ring actually? The description says 2-7/8" OD and 1/8" width, but then I see "Actual OD" and "Actual Width" listed too. Which one is right?
Question by: Gary H on Jan 10, 2026, 9:38 PM
For precise measurements, the actual OD is 2.887 inches and the actual width is 0.139 inches. The nominal measurements are there for general reference, but use the "actual" numbers when you need to be exact.
Answer by: Customer Support on Jan 12, 2026, 6:00 AM
trying to swap out an old -231 o-ring, is this the same dash size?
Question by: Eddie A on Jan 16, 2026, 10:20 AM
Match it up by dash size first. This one is a -231 (Hercules catalog C1CE83, supplier part 568-231) and it has a nominal 2-5/8 inch ID, 2-7/8 inch OD, with a 1/8 inch nominal width.
Answer by: Customer Support on Jan 18, 2026, 8:39 AM
what temp range does this o-ring hold up in, got some equipment running pretty hot
Question by: Rhonda W on Dec 27, 2025, 5:19 PM
Rated from -40°F up to 240°F, so it handles both cold startups and sustained heat without issue. For most hydraulic and fluid handling setups running in normal industrial ranges, that window covers you well.
Answer by: Customer Support on Dec 29, 2025, 6:54 AM

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A-354 -354 5-1/8 5-1/2 3/16 5.1 5.52 0.21 in 4
A-357 -357 5-1/2 5-7/8 3/16 5.475 5.895 0.21 in 4
A-425 -425 4-1/2 5 1/4 4.475 5.025 0.275 in 4
A-433 -433 5-1/2 6 1/4 5.475 6.025 0.275 in 4
A-440 -440 6-3/4 7-1/4 1/4 6.725 7.275 0.275 in 2