70 Durometer Buna-N O-Ring, Inch OD, 1/2 Inch ID, 0.10 Inch Width

Actual I.D.
0.49
Actual O.D.
0.69
Actual Width
0.103 in
Dash Size
-112
Brand
Hercules Sealing Products
Brand
Hercules Sealing Products
Pack Size
1.00
UOM
EA
Nominal I.D. (in)
1/2
Nominal O.D.
11/16
Nominal Width
3/32
Package Qty.
50
Supplier Part Number
568-112
Alternate Part Numbers
Alternate Part Number 568-112, Alternate Part Number C1CD67, Alternate Part Number MI-08740349, Alternate Part Number MINO-00407X90349
Product Weight
0.01 lbs

Product Questions & Answers

got a groove cut for a -112 o-ring. is this the right dash size and what are the actual measurements?
Question by: Dale P on Jan 11, 2026, 1:19 PM
It matches dash size -112, with a nominal 1/2 inch ID, 11/16 inch OD, and 3/32 inch cross section. The actual measured dimensions are about 0.487 inch ID, 0.693 inch OD, and 0.103 inch width.
Answer by: Customer Support on Jan 12, 2026, 4:22 PM
runs from -40 up to 240 degrees fahrenheit on this o-ring, but what's it actually made of and will that hold up in a hydraulic fluid environment?
Question by: Tommy C on Oct 7, 2025, 12:52 PM
Buna-N rubber at 70 durometer is about as common as it gets for hydraulic sealing work. That material handles petroleum-based hydraulic oils well and the 70 durometer rating puts it right in the middle range for hardness, firm enough to resist extrusion under pressure but still pliable enough to seat properly. The temperature window of -40°F to 240°F covers most standard hydraulic system operating conditions without issue.
Answer by: Customer Support on Oct 8, 2025, 2:21 PM
What size is this o-ring actually? I see the nominal, but what's the real deal?
Question by: Shawn M on Mar 11, 2026, 8:50 AM
Actual dimensions are an OD of 0.693 inches, an ID of 0.487 inches, and a width of 0.103 inches.
Answer by: Customer Support on Mar 12, 2026, 11:33 AM
i’ve got a dash -112 o-ring i’m swapping out, is this the right size or am i gonna be fighting it?
Question by: Bobby R on Mar 25, 2025, 8:13 PM
For a -112 size, the nominal dimensions are 1/2 inch ID, 11/16 inch OD, and 3/32 inch width. The actual measured dimensions listed are 0.487 inch ID, 0.693 inch OD, and 0.103 inch width, so it should line up with a standard -112 replacement.
Answer by: Customer Support on Mar 27, 2025, 11:27 AM
what temp range is this o-ring good for? got some equipment that sees pretty cold winters and hot summer conditions both
Question by: Dean B on Oct 25, 2025, 4:18 PM
Buna-N at 70 durometer holds up from -40°F all the way to 240°F, so seasonal temperature swings on outdoor equipment generally fall well within that range. Cold starts and summer heat cycles both stay inside those limits without pushing the material toward cracking or excessive softening.
Answer by: Customer Support on Oct 27, 2025, 6:08 AM
What's the temperature range on these o-rings?
Question by: Dwight E on Oct 19, 2025, 10:26 AM
These Buna-N o-rings are rated for use between -40°F and 240°F.
Answer by: Customer Support on Oct 20, 2025, 4:45 PM

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A-113 -113 9/16 3/4 3/32 0.549 0.755 0.103 in 50
A-137 -137 2-1/16 2-1/4 3/32 2.05 2.256 0.103 in 20
A-207 -207 9/16 13/16 1/8 0.546 0.824 0.139 in 50
A-211 -211 13/16 1-1/16 1/8 0.796 1.074 0.139 in 20
A-212 -212 7/8 1-1/8 1/8 0.859 1.137 0.139 in 20
A-228 -228 2-1/4 2-1/2 1/8 2.234 2.512 0.139 in 20
A-330 -330 2-1/8 2-1/2 3/16 2.1 2.52 0.21 in 20
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