70 Durometer Buna-N O-Ring, Inch OD, 4-3/4 Inch ID, 0.21 Inch Width

Actual I.D.
4.73
Actual O.D.
5.15
Actual Width
0.21 in
Dash Size
-351
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
4-3/4
Nominal O.D.
5-1/8
Nominal Width
3/16
Package Qty.
4
Supplier Part Number
568-351
Alternate Part Numbers
Alternate Part Number C1CF93, Alternate Part Number MI-08740541, Alternate Part Number MINO-00407X21597
Product Weight
0.03 lbs

Product Questions & Answers

What's the actual outside diameter on this O-ring? Just want to make sure it'll fit right.
Question by: Randy B on Oct 12, 2025, 9:20 PM
The actual outer diameter is 5.145 inches, so double-check that measurement against your needs for proper fit.
Answer by: Customer Support on Oct 14, 2025, 8:39 PM
Got a cylinder that takes a dash -351 o-ring, this gonna fit right or do I need to double-check them dimensions before I order?
Question by: Ray P on Jul 17, 2025, 3:32 PM
For a dash -351 application, this one lines up correctly. The actual inner diameter is 4.725 inches, outer diameter is 5.145 inches, and the width comes in at 0.21 inches. The nominal ID is 4-3/4 inch and nominal OD is 5-1/8 inch, so as long as your groove is cut to those dash -351 specs, you're good to go.
Answer by: Customer Support on Jul 19, 2025, 2:29 PM
got an o-ring groove that calls for dash -351. is this the right one or am i gonna be fighting it
Question by: Pete F on Jul 29, 2025, 1:05 PM
Match it up by dash size and dimensions. This one conforms to dash size -351 and measures 4.725 inch ID, 5.145 inch OD, and 0.21 inch width, with nominal callouts of 4-3/4 inch ID, 5-1/8 inch OD, and 3/16 inch width.
Answer by: Customer Support on Jul 31, 2025, 6:48 AM

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