70 Durometer Buna-N O-Ring, Inch OD, 5-1/4 Inch ID, 0.14 Inch Width

Actual I.D.
5.23
Actual O.D.
5.51
Actual Width
0.139 in
Dash Size
-252
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
5-1/4
Nominal O.D.
5-1/2
Nominal Width
1/8
Package Qty.
4
Supplier Part Number
568-252
Alternate Part Numbers
Alternate Part Number C1CF17, Alternate Part Number MI-08740459, Alternate Part Number MINO-00407X90459
Product Weight
0.02 lbs

Product Questions & Answers

i’ve got a dash -252 o-ring i’m replacin. are these the same size or am i gonna be fightin it
Question by: Brett K on Jan 20, 2026, 2:00 PM
For a dash size -252, the nominal dimensions are 5-1/4 inch ID, 5-1/2 inch OD, and 1/8 inch width. The actual measured dimensions are about 5.234 inch ID, 5.512 inch OD, and 0.139 inch width, so it matches the -252 sizing with the typical actual-versus-nominal difference.
Answer by: Customer Support on Jan 21, 2026, 6:21 PM
got a seal that measures out to about 5.234 on the inside and sits in a groove that's seen some heat over the years, will buna-n hold up or should I be looking at something else for higher temps?
Question by: Billy C on Aug 4, 2025, 7:57 AM
Buna-N handles a range of -40°F up to 240°F, so for most standard hydraulic and industrial setups running within that band, you're in good shape. Where it starts to struggle is with certain synthetic fluids, fuels, or environments pushing past that upper limit. If your system stays under 240°F and you're not running anything aggressive like phosphate ester fluid, this material is a solid fit for everyday sealing duty.
Answer by: Customer Support on Aug 5, 2025, 3:38 PM
these come in a 4-pack right? trying to figure out how many i need to order for a repair job on some cylinder heads
Question by: Shawn C on May 19, 2025, 5:12 PM
they ship in packs of 4. Each ring measures 5.234 inches on the inside diameter and 5.512 on the outside, with a width of 0.139 inches, so make sure your groove dimensions line up with those actuals before you order up.
Answer by: Customer Support on May 21, 2025, 5:09 PM

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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