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Industrial o-rings on a measurement tray beside an AS568 size reference sheet

Independent seal sourcing

o ring

O-Rings Sourcing is an independent sourcing partner. We help US buyers write one size standard, compound, Shore A hardness, quantity and destination so factory wholesale quotes can sit on the same line. We do not mold seals, hold warehouse stock, or sell under a brand appointment. The measured product form that starts this brief is o ring; neighbouring spellings stay on later pages instead of being copied into this H1.

Request Factory Quotes
  • Size AS568 or metric ID/OD
  • Compound NBR, FKM, silicone, EPDM
  • Hardness Shore A the factory must confirm
  • Destination US state or postal code

4

Request axes before a factory can answer

5

Reviewed inquiry options in this family

0

Warehouse SKUs claimed by this desk

1

Shared specification list sent to each plant

Which purchasing requirements separate o ring from neighbouring options

An o ring brief names a closed-loop seal by inner diameter, outer diameter or AS568 dash size, plus compound and Shore A. An o-ring kit, a drawing-based custom, or a consumer silicone ring search is a different request even when the search string shares the family. The buyer still chooses the size standard and the medium; the factory only confirms what it can mold.

Nitrile / NBR

Oil and fuel contact on pumps and fittings. Ask the factory to name the acrylonitrile level and Shore A, not just “black rubber”.

  • NBR
  • Buna-N
  • 70 Shore A typical ask
  • ASTM D2000 line
Request Datasheet

FKM / fluoroelastomer

Hydrocarbons and higher heat where nitrile swells. Do not treat FKM as interchangeable with silicone on the same groove.

  • FKM
  • Type 1 / Type 2
  • Compression set ask
  • Fuel swell check
Compare Grades

Silicone

Wide temperature and food or medical files after qualification. Consumer ring wording is not an industrial dash size.

  • VMQ
  • Platinum or peroxide cure
  • FDA 21 CFR lot file
  • -60 to +230 C ask
Request Datasheet

EPDM

Water, steam and weather seals. Confirm the cure system before a factory substitutes EPDM for NBR on a hydraulic fitting.

  • EPDM
  • Peroxide cure ask
  • NSF 61 if potable
  • Ozone / steam check
Compare Grades

What an independent o ring request has to contain

01

Write the axes

Inner and outer diameter or AS568 / metric size, compound, Shore A hardness the supplier must confirm, and service temperature in F or C with the medium. Those stay the buyer’s decisions.

02

Split quantity

Quantity belongs against each configuration, not as one lump. State sample versus production lot, packing, destination, and the documents that travel with the lot.

03

Compare replies

O-Rings Sourcing sends the same list to more than one factory. A plant certificate is not a lot test. A unit price without Incoterms is a different deal.

Where US buyers usually start an o ring brief

Pump and valve gland with an o-ring groove

Pumps and valves

Hydraulic fitting face seal

Hydraulic fittings

OEM assembly tray of molded seals

OEM assemblies

Food equipment lid gasket groove

Food equipment after files

Automotive hose junction o-ring

Automotive after IATF files

Procurement situations, not customer testimonials

These cards are checklists for typical US buyer situations. They are not named reviews, savings claims, or completed orders.

“A pump OEM replacing a nitrile o ring on a 2 inch gland still has to name AS568 or metric size and Shore A. A photo of a black ring is not a specification.”

Scenario A
Materials manager · Pump OEM · US Midwest

“A hydraulic fitting kit mixes NBR and FKM on one purchase order only when each dash size and compound is a separate quantity row.”

Scenario B
Commodity buyer · Mobile hydraulics · US South

“A food-equipment lid that started as a consumer silicone-ring search still needs service temperature, cure system, and a lot-level food-contact file.”

Scenario C
QA engineer · Food equipment · US West

Checks this desk repeats on every o ring brief

AS568 / metric

Size standard stays a buyer field. Factories confirm dash size against the groove, not against a stock photo.

Shore A

Hardness is confirmed by the supplier on the quoted compound. This desk does not publish a hardness table as its own.

F or C + medium

Temperature without the fluid is incomplete. Silicone and FKM win different windows; see the application page for the trade-off.

Lot files

REACH, RoHS, FDA 21 CFR or IATF papers belong to a named grade and lot. A company badge is not current product evidence.

Send the o ring specification you already have

Missing fields stay visible. We will not invent a dash size, hardness or destination to make a form look complete.

Request Factory Quotes Open inquiry options