Viton O-Ring, Brown, Qty of Five

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$3.00
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SKU
DX-V568A-xx
We stock a variety of sizes of Viton fluorocarbon elastomer (FKM) oxygen compatible O-rings suitable for use in SCUBA applications. Sold in individual packages of five each.

Viton O-Ring, Brown, Qty of Five

Viton O-Ring, Brown, Qty of Five
Viton O-Ring, Brown, Qty of Five
  • Viton fluorocarbon elastomer (FKM) oxygen compatible O-rings
  • Choose the size you need from the chart below
  • Qty 5 are packaged in a resealable plastic bag
  • All sizes are 90-durometer (except -003 & -006 O-rings are 75-duro)

These Viton fluorocarbon elastomer (FKM) oxygen compatible O-rings are brown color and 90-duro (except for the -003 & -006 O-rings, which are 75-duro). They are well suited for the SCUBA applications we describe. Five of the size O-ring you select are packaged in a resealable plastic bag that is properly labeled with the size.

AS568B- Outside Diameter SCUBA Application Seal
214 1-1/4 Cylinder with Large Neck/Valve (3/4 NPS - All Aluminum, most Steel cylinders)
116 15/16 Cylinder with Small Neck/Valve (7/8 UNF - "Genesis" 3500 psi Steel cylinders)
112 11/16 Standard DIN Regulator/Valve (Nearly all DIN regulators)
111 5/8 Small DIN Regulator/Valve (You know if you need this one)
015 11/16 Cylinder Valve Bonnet Nut
014 5/8 Standard Yoke Regulator/K-Valve
013 9/16 Large Low-Pressure Port/Hose (1/2 UNF)
012 1/2 High-Pressure Port/Hose (7/16 UNF) Manifold and Manifold Port Plugs
011 7/16 Standard Low-Pressure Port/Hose (3/8 UNF)
010 3/8 Low-Pressure Hose/2nd Stage Regulator Cylinder Valve Stem
006 1/4 BC Power Inflator
003 3/16 High-Pressure Hose/SPG Swivel
More Information
SKU DX-V568A-xx
Weight (lbs) 0.1500
Brand DGX
Customer Reviews
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    Everything arrived well and on time.
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    As described
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    Good fast and Quality of products
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    Arrived in a timely manner. They're 0-rings, what can I say, but I have no reason to doubt their quality based on all the other stuff I've bought from Dive Gear Express.
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    Product as listed
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Tek Tip Warning Image WARNING

Designers of modern SCUBA equipment often specify O-rings with special properties and materials for specific uses inside their equipment. The special o-rings are supplied as part of original equipment manufacturer (OEM) service parts kits. Substituting any other generic O-ring just because it's the right size can cause difficult-to-diagnose problems and degrade performance. Improper service could cause a failure which would have serious and life threatening consequences.

Sizing and Selecting O-Rings for SCUBA

Sizing --Society of Automotive Engineers AS568B is an Aerospace Standard that specifies sizes for O-Rings used in sealing applications. An AS568B number is a three-digit suffix that identifies the O-Ring's size. Technically, an O-Ring size is listed as AS568B-016, AS568B-112, etc., but most people use just the three-digit number. The first digit denotes the O-Ring cross section width: 0xx = 1/16-inch, 1xx = 3/32-inch, 2xx = 1/8-inch. While it might seem convenient to provide a picture sizing chart, we've never seen an online version that could be reproduced exactly in a Web browser. Also, sizing an existing O-Ring that has been in service can be error prone because O-Rings can take a set that changes their dimensions enough to be misleading. Luckily, the sizes used in 'user servicable' SCUBA applications are fairly regular, so it's probably best to choose the size based upon the application.

Materials -- O-rings can be made of a very long list of exotic materials; most are inappropriate for SCUBA applications. The materials commonly used in SCUBA applications appear in the following table.

Material Description
Acrylonitrile-Butadine Copolymers
(NBR or Nitrile)
Most O-rings used in SCUBA are made from Nitrile, a hydrocarbon based synthetic rubber. Nitrile offers excellent resistance to many oils and acids and has good physical properties. However, Nitrile is not a very oxygen resistant material and is not considered oxygen compatible. Nitrile is also often referred to as Buna-N.
 
Fluorocarbon Elastomers
(FKM)
O-rings made of FKM have been the preferred choice for oxygen and nitrox compatibility in SCUBA diving applications. FKM is an elastomer with excellent oil and oxygen resistance at high and low temperatures, very good chemical resistance. Even for use with ordinary air, most experts agree that FKM O-rings outperform common Nitrile O-rings.
 
Polyurethane
(PUR)
The milky white O-ring occasionally seen in the face of K-valves, sometimes called a 10,000 psi O-ring, is made of Polyurethane. Polyurethane is very abrasion-resistant, but it is sensitive to UV light (sunlight).
 
Ethylene Propylene Diene Monomer
(EPDM)
EPDM O-rings are becoming more common in SCUBA because some people feel it's a safer material for use in breathing air systems. EPDM is a elastomer with excellent weatherability, heat resistance, dielectric qualities and odor-free characteristics. However, EPDM is less resilient and is not recommended for use with petroleum derivatives.

Hardness -- O-rings are normally available with a hardness rating, as measured by an ASTM type-A durometer, of 70 (the "soft" kind) or more rarely a rating of 90 (the "stiff" kind). The O-rings sold on this page are 90-duro (except for the -003 & -006 O-rings), and well suited for the SCUBA applications we describe. The soft O-rings are appropriate for dynamic applications where the O-ring is providing a seal with a constantly moving part, such as inside regulators. The stiff O-rings are more durable in static applications where the O-ring is providing a seal with stationary or occasionally moving parts, such as a valve.

Color -- O-rings are available in nearly any color, although most commonly seen in black. Most Viton O-rings are black. The oxygen compatible O-rings sold on by Dive Gear Express are brown, simply to make them easily distinguishable from Nitrile O-rings which are usually black and EPDM O-rings which are often purple. Just to be clear, the COLOR of the O-ring is MEANINGLESS. Some people believe there is a difference in quality based on color, but that is more likely attributed to unknowingly using soft dynamic O-rings in static applications. Our O-ring manufacturer states there is little difference in quality for O-rings based on color alone, and independent testing supports that statement. Some people also incorrectly believe a Viton O-ring can be distinguished from a Nitrile O-ring by the surface appearance. Nitrile O-rings are said to have a shiny surface, and Viton O-rings are said to have a matte surface. This is not a reliable indicator, and certainly not true if the O-ring has been lubricated.

Counterfeits --Many people refer to any and all generic "oxygen-compatible" O-rings as Viton. Viton® is DuPont Performance Elastomer's brand name for their fluorocarbon based elastomers (FKM). However, DuPont is not the only company that manufactures FKM products. Bear in mind that not all FKMs are equivalent, and there are different types intended for various different applications. The industry has also begun to see a lot of counterfeits, particularly with O-rings manufactured outside the US. As a result, you could end up with O-rings that are not the type of FKM you need and possibly not even an oxygen compatible O-ring at all. We've seen impostor O-rings that were actually a mixture of a little FKM and mostly cheap plain rubber, yet were also brown. We're going to be very frank: some of the 'asian import' o-ring kits in the little plastic compartmentalized boxes may not be 'as advertised'. Counterfeit FKM o-rings are so widespread that we make up our own kits using o-rings supplied through trustworthy channels.

Shelf-Life -- The Society of Automotive Engineers (SAE) issued ARP5316 as the recommended practice for the storage of o-rings. It states the shelf life prior to use of Polyurethane (PUR) orings is 5 years, Nitrile (NBR) o-rings is 15 years and the shelf life of Viton (FKM) o-rings is "unlimited".



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