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IBC tote fittings do not use one universal thread size. The most common outlet size is about 2 inches, but the thread style varies by tote maker and valve type.
For many common IBC totes, the outlet has a coarse buttress thread rather than standard pipe thread. One of the most common sizes is S60x6, which has an outside thread diameter of about 60 mm and a 6 mm thread pitch. Other IBC totes may use different buttress sizes or pipe-thread connections.
The safest approach is to identify both the diameter and thread type before buying an adapter.
The Most Common IBC Thread Size
A very common IBC valve outlet is:
- S60x6
- About 60 mm outside diameter
- 6 mm thread pitch
- Coarse buttress-style thread
This connection is often described by sellers as a 2-inch IBC tote thread, although it is not the same thing as a 2-inch NPT pipe thread.
That difference matters. An adapter labeled only "2 inch" may not fit your tote.
What S60x6 Means
The designation breaks down roughly like this:
- S refers to the buttress-style thread form.
- 60 refers to the nominal thread diameter in millimeters.
- 6 refers to the thread pitch, or distance from one thread to the next, in millimeters.
The large, widely spaced threads are easy to recognize compared with ordinary plumbing threads.
IBC Thread Size Is Not the Same as Pipe Size
One of the most common mistakes is assuming that a 2-inch IBC outlet accepts a normal 2-inch plumbing fitting.
It often does not.
A typical IBC valve may have an S60x6 male outlet. A normal plumbing fitting may use:
- NPT
- BSP
- Straight pipe thread
- Hose thread
These thread systems have different diameters, pitches, and shapes.
Trying to force one onto another can damage the plastic threads and cause leaks.
Common IBC Outlet Thread Types
Several connection types appear on IBC totes.
| Connection | Typical use |
|---|---|
| S60x6 | Very common coarse IBC outlet |
| S100x8 | Larger IBC outlet on some containers |
| Other buttress threads | Manufacturer-specific valves |
| NPT | Used on some valves and adapters |
| BSP | More common in some markets outside North America |
| Camlock | Often added with an adapter for quick hose connections |
There are also manufacturer-specific versions that may look similar while having slightly different thread dimensions.
That is why visual appearance alone is not always enough.
How to Tell What Thread Your IBC Tote Has
Start by checking the valve and container markings. Some valves have the thread size molded into the plastic.
If there is no marking, measure the fitting.
Measure the outside diameter
Use calipers if possible.
Measure across the outside of the male threads.
An S60x6 connection will be roughly 60 mm across the threads.
A tape measure can give you a rough idea, but calipers are much better when you are trying to distinguish between similar fittings.
Check the thread spacing
Measure the distance between thread peaks.
S60x6 has a coarse pitch of about 6 mm.
You can also measure across several threads and divide the distance by the number of spaces. This can be easier than measuring one thread.
Look at the thread shape
IBC buttress threads usually look much larger and coarser than ordinary pipe threads.
NPT threads are finer and tapered. The fitting becomes tighter as it screws together.
Many IBC buttress connections are designed to seal with a gasket rather than by wedging tapered threads together.
Why "2-Inch IBC Adapter" Can Be Misleading
The term 2-inch IBC fitting is commonly used, but it can describe several different things.
It may refer to:
- The approximate valve outlet size
- An S60x6 buttress thread
- A 2-inch pipe connection
- A fitting that converts an IBC outlet to another 2-inch connection
These are not automatically interchangeable.
Alongside practical considerations for all ibc totes the same thread size, assess likely upkeep demands over the system’s service life.
When selecting an adapter, look for the exact connection on both sides. For example:
S60x6 female × 3/4-inch garden hose thread
is much more useful than a listing that simply says:
2-inch IBC adapter
Adapting an IBC Tote for Rainwater Use
For a rainwater system, the IBC valve often needs an adapter before it can connect to garden hose, PVC pipe, polyethylene tubing, or a pump.
A common setup might be:
IBC valve → IBC thread adapter → shutoff fitting or pipe → hose or irrigation line
Before choosing the adapter, check:
- IBC outlet thread
- Adapter inlet thread
- Adapter outlet size
- Pipe or hose connection type
- Gasket location
- Valve clearance
- Required flow rate
Larger irrigation lines may benefit from keeping the outlet close to the original valve diameter instead of immediately reducing it to a small garden hose.
Reducing the line too much can limit flow, especially in a gravity-fed system.
Do IBC Fittings Need Thread Tape?
Not always.
Many IBC buttress-thread adapters seal against a flat gasket. In that type of connection, the gasket does most of the sealing.
Adding large amounts of thread tape to the coarse IBC threads usually does not correct a damaged gasket or incompatible fitting.
Thread tape may be appropriate on certain downstream tapered pipe-thread connections, such as NPT fittings, when the fitting manufacturer calls for it.
Check how the specific joint is designed to seal before adding sealant.
Watch for Damaged or Contaminated Totes
Thread compatibility is only one part of choosing an IBC tote for rainwater storage.
Before using a secondhand tote, find out what it previously contained. Do not assume that washing an unknown container makes it suitable for water storage.
For garden or household rainwater systems, use a container whose previous contents and material are appropriate for your intended use.
Water intended for drinking requires much more than choosing the correct tote and fitting. Collection surfaces, storage materials, pretreatment, treatment, maintenance, current laboratory testing, and applicable local requirements all matter.
A Simple Rule for Buying IBC Fittings
Do not buy an IBC adapter based only on the words 1 inch, 2 inch, or 3 inch.
Confirm these three things:
- The outside diameter of the tote outlet.
- The thread pitch and thread style.
- The connection you need on the other side of the adapter.
For many totes, that first connection will be S60x6. But measuring first is much easier than dealing with an adapter that almost fits.
Frequently Asked Questions
What is the most common IBC tote thread size?
S60x6 is one of the most common IBC tote outlet threads. It is approximately 60 mm in diameter with a 6 mm thread pitch.
Is S60x6 the same as 2-inch NPT?
No. S60x6 is a coarse IBC buttress thread. A 2-inch NPT fitting uses a different thread form and pitch and should not be forced onto it.
Are all IBC tote valves the same size?
No. Valve sizes and thread types vary by manufacturer and tote design. Some use S60x6, while others use larger buttress threads or different connection systems.
How do I measure an IBC fitting?
Measure the outside diameter of the male threads with calipers, then measure the distance between thread peaks. Also check whether the threads are coarse buttress threads or conventional pipe threads.
What does S60x6 mean on an IBC fitting?
It indicates a roughly 60 mm thread diameter and a 6 mm thread pitch using an IBC-style buttress thread form.
Can I connect a garden hose directly to an IBC tote?
Usually you need an adapter. A common setup converts the tote's IBC thread to garden hose thread. Confirm the tote thread before ordering the adapter.
Should I use thread tape on an IBC adapter?
Not automatically. Many IBC adapters seal with a gasket rather than the threads. Thread tape is more commonly used on certain tapered pipe-thread connections downstream.
