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ORING OD 7/8 W 1/16

Description & Features

Manufactured by Hercules Sealing Products, this standard O-ring carries a nominal outside diameter of 7/8 inch and a nominal width of 1/16 inch. Actual dimensions measure 0.88 inch OD, 0.74 inch ID, and 0.07 inch width, making it well-suited for hydraulic sealing applications where consistent dimensional accuracy is essential.

The ORING OD 7/8 W 1/16 is a commonly stocked sealing component used across a wide range of hydraulic and industrial equipment. Its compact cross-section fits standard gland geometries designed for this nominal size, and it is compatible with many cylinders, valves, and fittings that call for a 3/4 inch nominal ID seal.

SKU: 568-018

Supplier Part Number (MPN): 568-018

Alternate Part Numbers: 568-018-B, A-018, C1CD22, H70018, H90018, MI-08740312, MINO-00407X90312

Specifications

Actual I.D. 0.74 Inch	Actual O.D. 0.88 Inch	Actual Width 0.07 Inch	Alternate Part Numbers Alternate Part Number 568-018-B, Alternate Part Number A-018, Alternate Part Number C1CD22, Alternate Part Number H70018, Alternate Part Number H90018, Alternate Part Number MI-08740312, Alternate Part Number MINO-00407X90312	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Nominal I.D. (in) 3/4	Nominal O.D. 7/8	Nominal Width 1/16	Supplier Part Number 568-018	Product Weight 0.01 lbs

Product Questions & Answers (4)

Question by: Jimmy K on Nov 19, 2025, 6:00 PM

what temp range does this o-ring hold up to? got some equipment that sees pretty cold winters and hot summer days both

Answer by: Customer Support on Nov 21, 2025, 8:06 AM

Buna-N at 70 durometer covers a solid range for that kind of situation. This particular o-ring is rated from -40°F on the cold end up to 240°F on the high side, so seasonal swings in most working environments fall well within what it can handle.

Question by: Duane B on Nov 5, 2025, 4:26 PM

trying to match up an old seal, is this the o-ring with a 3/4 inch ID and 7/8 inch OD?

Answer by: Customer Support on Nov 7, 2025, 6:29 AM

It’s a nominal 3/4 inch I.D. by 7/8 inch O.D. with a 1/16 inch nominal width. The actual measurements listed are about 0.74 inch I.D., 0.88 inch O.D., and 0.07 inch width.

Question by: Kent C on Aug 20, 2025, 5:38 PM

what's the actual OD on this one? nominal says 7/8 but I need the exact number before I order

Answer by: Customer Support on Aug 22, 2025, 2:45 PM

Measured out, the actual outside diameter runs 0.88 inch. The nominal 7/8 is just the standard call-out size, so if you're matching to a groove or bore, 0.88 is the number to work with. The actual inside diameter is 0.74 inch and the width comes in at 0.07 inch, which corresponds to the 1/16 nominal width.

Question by: Tommy B on Dec 9, 2025, 2:24 PM

trying to match up an old A-018 o-ring, is this the same size or am i off?

Answer by: Customer Support on Dec 11, 2025, 7:15 AM

Cross reference wise, it matches the oldsku A-018 and the supplier part number 568-018. Size wise it is a 3/4 inch nominal ID, 7/8 inch nominal OD, and 1/16 inch nominal width, with actual measurements listed as 0.74 inch ID, 0.88 inch OD, and 0.07 inch width.