70 Durometer Buna-N O-Ring, Inch OD, 1-1/4 Inch ID, 0.14 Inch Width

Actual I.D.
1.23
Actual O.D.
1.51
Actual Width
0.139 in
Dash Size
-218
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
1-1/4
Nominal O.D.
1-1/2
Nominal Width
1/8
Package Qty.
20
Supplier Part Number
568-218
Alternate Part Numbers
Alternate Part Number 568-218, Alternate Part Number A-218-ORING, Alternate Part Number C1CE67, Alternate Part Number MI-08740424, Alternate Part Number MINO-00407X90424
Product Weight
0.01 lbs

Product Questions & Answers

trying to match up an old o-ring, is this the -218 dash size with a 1-1/4 inch ID?
Question by: Denise B on Mar 16, 2026, 12:11 PM
For fit confirmation, this one is dash size -218 with a nominal 1-1/4 inch inside diameter and a nominal 1/8 inch width. The actual measured ID is listed as 1.234 inches and the actual width as 0.139 inch.
Answer by: Customer Support on Mar 17, 2026, 7:17 PM
what's the temp range on this o-ring? got some equipment runnin pretty hot and need to know if buna-n can handle it
Question by: Debbie B on Apr 1, 2025, 7:11 AM
Buna-N at 70 durometer holds up from negative 40 degrees Fahrenheit all the way to 240 degrees Fahrenheit. If your equipment is staying under that 240 mark, you should be in good shape. Push past that ceiling and you'll start seeing the material break down faster than you'd want.
Answer by: Customer Support on Apr 3, 2025, 6:28 AM
What's the inside and outside diameter on this o-ring? Gotta make sure it's the right fit for my application.
Question by: Shawn F on Nov 2, 2025, 4:19 PM
This O-ring has an actual inner diameter of 1.234 inches and an actual outer diameter of 1.512 inches. The actual width is 0.139 inches. Make sure those measurements line up with your needs.
Answer by: Customer Support on Nov 3, 2025, 4:31 PM
these come in a 20-pack right? trying to figure out how many bags to order for a decent stock on hand
Question by: Dean P on Jul 18, 2025, 11:11 AM
20 pieces per package. Makes it pretty easy to stock up without ordering a bunch of individual rings. If you go through these regular, ordering a couple packs at a time keeps you covered without a big outlay.
Answer by: Customer Support on Jul 20, 2025, 8:26 AM

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A-341 -341 3-1/2 3-7/8 3/16 3.475 3.895 0.21 in 4
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