70 Durometer Buna-N O-Ring, Inch OD, 3/8 Inch ID, 0.14 Inch Width

Actual I.D.
0.36
Actual O.D.
0.64
Actual Width
0.139 in
Dash Size
-204
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
3/8
Nominal O.D.
5/8
Nominal Width
1/8
Package Qty.
50
Supplier Part Number
568-204
Alternate Part Numbers
Alternate Part Number C1CE51, Alternate Part Number MI-08740408, Alternate Part Number MINO-00407X90408
Product Weight
0.01 lbs

Product Questions & Answers

Will these Buna-N O-rings hold up to regular hydraulic fluid?
Question by: Rick J on Apr 24, 2025, 9:44 PM
Designed for reliability, these 70 Durometer Buna-N O-rings offer excellent resistance to oil and fuel, making them well-suited for hydraulic applications.
Answer by: Customer Support on Apr 26, 2025, 4:57 PM
These come in a 50-pack, right? Just wanna make sure before I order, we burn through o-rings pretty regular on our hydraulic press and I don't wanna be short.
Question by: Wade R on Dec 14, 2025, 2:31 PM
each package comes with 50 o-rings. For a shop that goes through them steady, that quantity ought to hold you over real well between supply runs. Just keep in mind the actual ID on these measures 0.359 inches and the OD is 0.637 inches, so double-check those against your press fittings before you commit to a bulk order.
Answer by: Customer Support on Dec 16, 2025, 9:22 AM
i’ve got a gland that takes a -204 o-ring. are these the right size or are they off a hair?
Question by: Hubert E on May 20, 2025, 8:45 PM
For a Dash Size -204, these match the standard with actual dimensions of 0.359 inch ID, 0.637 inch OD, and 0.139 inch width. The nominal callout is 3/8 inch ID and 5/8 inch OD, but the actual measurements are what you want to use for a precise fit.
Answer by: Customer Support on May 22, 2025, 7:26 AM

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