Dec. 16, 2024
Agriculture
We now sell over 6,300 oil seals on our website! Lip seals or rotary shaft seals are vital components for all types of engineering machinery. As a result, we've created a guide our guide to help you choose the correct seal for your application, you can then continue to our new Oil Seal section to make your purchase.
If you are looking for more details, kindly visit our website.
What are they? Oil Seals are used in driveshafts, crankshafts and hydraulic cylinders where a rotating shaft is lubricated by oil or grease. They are metal caps covered in rubber with a garter spring supporting the inner lip.
What is the difference between single and double lips? Double lipped rotary seals provide an extra layer of protection against outside containments such as dust or dirt.
What is the best size? Refer to our Oil Seal Tolerance Guide. Generally, oil seals require a very tight tolerance between the outer diameter and housing. Meanwhile, the garter spring allows a larger tolerance with the rotating shaft to prevent a build-up of friction.
Industry Comparison - Please view our Oil Seal Cross Reference guide to compare the part codes across 24 different industry retailers. The comprehensive list includes Simrit, Trelleborg, Forsheda Stefa, Eriks, Dichtomatic, SKF, Harwal, Garlock, Freudenberg, Gaco, Goetze, ISO, Kaco, NAK, NOK, Paulstra, Pioneer Weston, Simmerwerke, Timken, TCM and Wyko Seals.
Part Code Breakdown
Finally, Polymax part codes follow the same pattern as our O-rings - inner diameter, outer diameter and height. This is different from the industry-standard convention, whereby imperial oil seals follow - outer diameter, inner diameter and height.
1) We sell two lips - Single (21) or Double (23)
2) We sell four types - Type A, B, C & F
3) We sell two materials - Viton or FKM alternative (V) and Nitrile (N)
Many items of scuba diving equipment contain rubber O-rings that perish, dry out and develop cracks as time goes by. Even if the dive gear is not used, once it is a few years old, all the O-rings will need replacing.
An O-ring is a doughnut, or torus shaped seal typically used to prevent the passing of air or fluid. In other words, O-rings are used to keep fluid or air IN or OUT of a defined space. For example, an underwater camera housing uses O-rings to keep water out, and scuba regulators use O-rings to prevent precious air from escaping.
Just as barbed wire and duck tape seems to fix everything on land, O-rings and tie wraps seem to fix anything when you're at sea. These tiny rubber rings are crucial parts of a variety of scuba diving gear and equipment. O-rings prevent leaks at the seams of scuba gear and are a vital part of your life support equipment while diving. O-rings are used in scuba regulators, underwater lights and strobes, dive computers and cylinder/tank valves, and may often break due to pressure and wear and tear.
If you work on dive gear you know the importance of having the correct O-rings. Many of the O-rings used on cylinders, valves and regulator hoses are pretty much generic. Having a large selection of common O-rings is a must for the serious technical diver.
However, if you aren't well versed in the technical aspect of scuba gear, it's only advisable to attempt to change the O-ring on a scuba cylinder/tank valve (Yoke), or the face of your DIN regulator. Leave other O-rings for experienced professionals.
The information that follows should help you to know more about the O-rings used in various scuba diving applications.
In the USA the Society of Automotive Engineers (S.A.E.) publishes AS568B as an Aerospace Standard that specifies sizes for O-rings used in sealing applications. The equivalent British Standards Institution publication is BS, which lists all Imperial standard sizes. This standard includes all of the 5 main cross section groups in AS568, plus several sizes that are "between" AS568 sizes. In Australia BS is widely referenced in many industries, including the dive industry.
The BS number is a three-digit suffix that identifies the O-ring's size. Technically, an O-ring size is listed as BS-016, BS-112, etc., but most people use BS and the three-digit number (e.g. BS112), or just the three-digit number (e.g. 112). 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. However, you can download and print our Scuba O-Ring Sizes Chart (Adobe PDF | 356.37 KB) &#; Chart showing scuba diving O-ring sizes.
Please remember that 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 serviceable' SCUBA applications are fairly regular, so it's probably best to choose the size based upon the application.
BS- OD ID CS SCUBA Application Seal 214 1-1/4" 1"O-rings can be made of a very long list of exotic materials and most are inappropriate for SCUBA applications. The materials commonly used in SCUBA applications appear in the following table.
Material Description Acrylonitrile-Butadine Copolymers
The Difference between FPM, FKM and Viton®
The terms FPM, FKM and Viton® very often cause confusion and lead to incorrect interpretations. All of these designations actually stand for one single base material: fluoro rubber.
Dingtong are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.
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 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.
O-rings are available in nearly any colour, although most commonly seen in black. Most FPM/FKM/Viton® O-rings are black. The FPM/FKM/Viton® O-rings typically sold for scuba diving 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 COLOUR of the O-ring is MEANINGLESS.
Some people believe there is a difference in quality based on colour, 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 colour alone, and independent testing supports that statement.
Some people also incorrectly believe a FPM/FKM/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 FPM/FKM/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.
Remove the old O-ring visible in the orifice of the tank's regulator valve. For this you should use a brass O-ring pick which looks similar to that of a dental pick (pictured right). This is because metal tweezers or other objects can damage the o-ring groove, and even the slightest dent of the groove can cause leaks. A plastic toothpick too is a safe tool to use if you don't have an O-ring pick.
Using the pick, scoop the old O-ring out and clean out the groove using the same plastic toothpick or professional pick. Look out for sand or debris and keep an eye out for any corrosion. If you spot any, you may want to have a professional take a look at it.
Check your replacement O-ring against the one you removed. Confirm they are of similar size and materials.
Push the new O-ring into the groove to replace the old one. It should slip in easily. If you have to stretch or force it, it's probably not the right size. Never use silicone grease. This is especially to be avoided if you are using a nitrox mix (a combination of nitrogen and oxygen). Silicone reacts with oxygen. Avoid using anything other than your finger or the back eraser end of a pencil to seat the O-ring.
Make sure the new o-ring you just put in doesn't have any nicks, cuts or stretch marks on it. If it does, replace it with a new one again.
Test the new O-ring, by attaching the first stage of your regulator like you would normally do. Slowly open the cylinder valve to pressurize the regulator. If you hear a loud pop or clap and air hissing out, the O-ring is not properly seated. Go back to the beginning and try again.
Trident Brass O-Ring 3 Piece Tool Set
RRP: $29, Our Price: $25, You Save $4 (14%).
This tool set combines three brass picks for the removal of O-rings from regulators, scuba tanks valves and so on.
Apeks Regulator Travel Kit
This table lists the O-Rings used for servicing Apeks regulators for the following models:
* First stages: US4, DS4, UST, DST, FST(ATX100), FSR(ATX200)
* Second stages: T20, TX40/50/100/200, AT20, ATX40/50/100/200
Please download/view the Apeks Spare Parts and O-Ring Identification Chart (Adobe PDF | 308.83 KB).
Please download/view the Scubapro O-Rings Chart (Adobe PDF | 59.32 KB).
The ISO standard specification for dimensions of the O-ring groove in the nose of the 232 bar and 300 bar DIN connectors for compressed air has an inside dimension of 12 mm and an outside dimension of 17 mm. In , the standard depth for the groove was revised from the original 1.9 mm to a slightly deeper 2 mm. The specification for the sealing O-ring itself is an inside diameter of 11.2 mm with a cross section of 2.65 mm. From what we have been able to determine, not all SCUBA regulator manufacturers seem to use the current standard groove and O-ring in the universal DIN fittings found on their first stages.
The sealing O-ring in the nose of the DIN connector groove we find on most SCUBA regulator first stages is commonly an SAE AS568 and BS ISO imperial standard 112 size that is equivalent to 12.37 X 2.62 metric dimensions. In the case of a few regulators (notably Apeks, Atomic, and ScubaPro brands) their groove better accepts the next smaller 111 size O-ring that is equivalent to 10.77 X 2.62 metric dimensions. Both the 112 and 111 size O-rings are very common sizes available in a variety of choices for material and durometer.
The groove in the Cressi and Poseidon brand regulator DIN connectors measures closest to the original standard, best accepting a BS ISO metric size O-ring with 11.3 X 2.4 dimensions for which there is no imperial standard equivalent. The M2.4X11.3 size O-ring is uncommon, especially in a material suitable for use with Nitrox. (FYI, the O-ring in Yoke K-valves is easy, it is always an 014 size.)
Compared to the 111 size, the M2.4X11.3 size is slightly smaller cross section and slightly larger diameter with a good fit for the O-ring groove of the DIN connectors on Cressi and Poseidon regulators. Because of availability, most Nitrox and technical divers make do with a 111 size O-ring for their Cressi and Poseidon regulators, but the 111 is not as good a fit for the connector of those two brands.
In the European Union nations, the EN 144-3: standard requires a valve outlet known as M26x2 to be used on dive cylinders containing oxygen or Nitrox mixtures with greater than 22% oxygen. The M26x2 outlet is similar in appearance but slightly larger than the standard DIN outlet, and thus incompatible with the standard DIN connector found on SCUBA regulators. The purpose of this incompatible valve outlet is to force the dedication of cylinders, regulators and fill stations to Nitrox use. The sealing O-ring in the nose of the M26x2 connector is 13.9 X 2.6 metric dimensions, equivalent to the 113 size. The M26x2 outlet and connector for Nitrox and oxygen is very rarely seen outside the EU.
At The Scuba Doctor Dive Shop we keep the following O-rings commonly used on the face of DIN regulators and cylinder/tank valves in stock for purchase in-store as emergency replacements:
Sonar DIN O-Rings for Cressi and Poseidon First Stages (10 Pack)
RRP: $12, Our Price: $9, You Save $3 (25%).
The Sonar DIN O-Rings for Cressi and Poseidon First Stage Regulators are a great save a dive kit item. The O-rings in this pack of 10 are coloured Yellow which makes it easy to identify them.
Sonar DIN O-Rings for Apeks and Scubapro First Stages (10 Pack)
RRP: $12, Our Price: $9, You Save $3 (25%).
The Sonar DIN O-Rings for Apeks and Scubapro First Stage Regulators are a great save a dive kit item. The O-rings in this pack of 10 are coloured Red which makes it easy to identify them.
Sonar DIN O-Rings for Mares First Stages (10 Pack)
RRP: $12, Our Price: $9, You Save $3 (25%).
The Sonar DIN O-Rings for Mares First Stage Regulators are a great save a dive kit item. The O-rings in this pack of 10 are coloured Blue which makes it easy to identify them.
Sonar Scuba O-Ring - 112 NBR 90 Duro - Black (10 Pack)
RRP: $10, Our Price: $8, You Save $2 (20%).
This is the O-ring size typically used at the front and back of the DIN insert used to convert standard DIN valves to INT/Yoke valves. These are the O-rings we prefer to use on the Faber / San-o-Sub DIN/K valves on Faber steel cylinders. We prefer these harder 90 durometer O-rings over the softer 70 duro ones commonly used.
Sonar Scuba O-Ring - 112 Viton/FPM 75 Duro - Brown (5 Pack)
RRP: $15, Our Price: $11.50, You Save $3.50 (23%).
This is the O-ring size typically used at the front and back of the DIN insert used to convert standard DIN valves to INT/Yoke valves. These are the O-rings we prefer to use on the Faber / San-o-Sub DIN/K valves on Faber steel cylinders that are being used for Nitrox or Oxygen.
Trident O-Ring Kit and Pick
RRP: $29, Our Price: $26, You Save $3 (10%).
A mini scuba cylinder/tank container with Brass Pick and 10 popular diver O-Rings. A must for any diver's spares kit!
We have a range of O-Rings and Lubricants available for purchase from our online dive shop.
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.
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