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No. IBC tote threads are not all the same. Many totes use the common S60x6 coarse thread at the valve outlet, but other thread sizes and standards are also used. Two outlets can look almost identical and still need different adapters.
Before buying a hose, pump, camlock, or irrigation adapter, check the outside diameter, thread spacing, and thread shape on your actual tote.
The Most Common IBC Thread: S60x6
S60x6 is one of the most common threads found on IBC tote valve outlets.
The name gives you two useful measurements:
- 60 means the thread is about 60 mm across.
- 6 means there is about 6 mm between thread peaks.
- S refers to the coarse buttress-style thread.
The threads are large and widely spaced. This makes S60x6 fairly easy to recognize once you know what you are looking for.
It is also commonly advertised as:
- 60 mm coarse thread
- 2-inch IBC thread
- DN50 IBC thread
- S60 × 6
Be careful with the term 2-inch IBC thread. It does not mean the fitting has a normal 2-inch plumbing thread. S60x6 and 2-inch pipe threads can have similar outside diameters but very different thread spacing.
Common IBC Threads Are Not Interchangeable
IBC totes can use several connection types.
| Connection | Approximate size | What makes it different |
|---|---|---|
| S60x6 | 60 mm | Very coarse 6 mm pitch |
| S75x6 | 75 mm | Larger coarse IBC thread |
| S100x8 | About 100 mm | Large outlet with 8 mm pitch |
| M80x3 | About 80 mm | Metric thread with 3 mm pitch |
| S92x4 | About 92 mm | Less common coarse thread |
| 2-inch BSP | About 59 mm | Fine pipe thread |
| 2-inch NPT/NPS | About 60 mm | Fine North American pipe thread |
Several of these can look surprisingly similar until you put them next to each other.
There are also differences between older and newer totes, manufacturers, valve designs, and replacement valves.
The safest rule is simple:
Do not order an IBC adapter based only on tote capacity or the words "2 inch."
Measure the connection first.
Why Two 2-Inch IBC Fittings May Not Fit
"2 inch" is often a nominal size. Nominal means it describes the general fitting size rather than giving you the exact outside diameter and thread pattern.
For example, an S60x6 outlet is around 60 mm across. A 2-inch pipe connection can also be close to 60 mm across.
But look at the thread spacing and the difference becomes clear.
An S60x6 has threads roughly 6 mm apart. Common 2-inch pipe threads have much finer spacing, around 2 mm between threads.
Trying to screw one into the other can:
- damage the plastic threads
- cross-thread the fitting
- crack an adapter
- cause a slow leak
- create a connection that comes loose later
If an adapter only turns a fraction of a turn before becoming unusually tight, stop. Do not use a wrench to force mismatched plastic threads together.
How to Identify Your IBC Thread
You usually need four pieces of information.
1. Check Which Connection You Are Measuring
An IBC can have several different threaded parts.
These can include:
- the connection between the tank and valve
- the discharge side of the valve
- a removable valve cap
- the large top fill lid
- smaller threaded openings in the lid
Do not assume the tank connection and valve outlet use the same thread.
If you are trying to attach a garden hose, pump, or irrigation line, you normally need to identify the thread on the discharge side of the existing valve.
2. Measure the Outside Diameter
For a male thread, measure straight across the widest part of the threads.
A caliper is much more useful than a tape measure.
For example, a measurement near 60 mm puts S60x6 and several 2-inch pipe threads into consideration. Diameter alone does not tell you which one you have.
3. Measure the Thread Pitch
Thread pitch is the distance between matching points on two neighboring threads.
S60x6 has a very obvious coarse pitch of about 6 mm.
If the threads are much closer together, you probably do not have S60x6.
Measuring several threads at once can make this easier. For example, measure across several thread peaks and divide by the number of spaces between them.
4. Look at the Thread Shape
IBC buttress threads are chunky and coarse.
NPT, NPS, and BSP pipe threads are much finer.
NPT is also a tapered pipe thread, while many other fittings use straight or parallel threads.
Do not identify a fitting from diameter alone.
S60x6 vs 2-Inch NPT
This is one of the easiest mistakes to make.
An S60x6 adapter and a 2-inch NPT fitting may both be described as "2 inch," but they are different systems.
S60x6 is a coarse IBC-style buttress thread.
NPT, or National Pipe Taper, is a common North American plumbing thread. The threads are much finer and the connection is tapered.
For a rainwater tote, you may use an adapter such as:
IBC S60x6 outlet → NPT adapter → pipe or pump fitting
That allows the tote's IBC thread to connect to standard plumbing components without trying to make incompatible threads fit directly.
BSP and NPT Are Different Too
Another common mistake is assuming BSP and NPT fittings will interchange.
BSP means British Standard Pipe.
NPT means National Pipe Taper.
They can look close in larger sizes, but their thread forms and spacing are not the same. A fitting may seem to start threading before binding or leaking.
If you are adapting an IBC tote to a pump or irrigation system, verify whether the downstream fitting is BSP or NPT rather than relying only on its stated diameter.
What About Camlock Fittings?
Explore practical considerations for all ibc totes the same thread size to verify connection requirements before hardware is ordered.
A camlock, also called a cam-and-groove coupling, is a quick-connect system commonly used with IBC totes.
The working camlock connection itself does not screw together. One side has locking arms that clamp onto the matching half.
However, an IBC camlock adapter may have a threaded connection on the tote side.
For example, a system might be:
S60x6 tote valve → 2-inch camlock adapter → camlock hose
The camlock size therefore does not tell you what thread is on your tote.
You still need to identify the tote-side connection.
Does Tote Capacity Tell You the Thread Size?
Not reliably.
A 275-gallon tote and a 330-gallon tote may both have S60x6 outlets. But capacity does not guarantee the thread.
Different totes of the same capacity can have:
- different valves
- different valve outlets
- different tank-to-valve connections
- replacement valves installed during reconditioning
- different top lids
The manufacturer name can help narrow the possibilities, but measuring the actual fitting is safer.
Choosing an Adapter for a Rainwater IBC Tote
Start at the tote and work outward.
For example, suppose you want to connect an IBC tote to a garden irrigation line.
Your connection path might be:
IBC valve → correct IBC thread adapter → hose or pipe fitting → irrigation line
Before buying anything, check:
- The thread on the existing IBC valve.
- Whether the adapter needs male or female threads.
- The connection type on the other side of the adapter.
- The hose or pipe size you want to use.
- Whether the gasket supplied with the adapter is suitable for water.
- Whether reducing the outlet size will restrict the flow you need.
A common rainwater setup may reduce a large IBC outlet to a garden-hose connection. That can work well for slow gravity watering.
For a pump or larger irrigation line, keeping a larger outlet may provide better flow.
The Gasket Matters as Much as the Thread
Many IBC connections seal against a gasket rather than relying on the threads themselves to stop water.
That means the correct thread can still leak if:
- the gasket is missing
- the gasket is twisted
- the sealing surface is dirty
- the gasket has hardened
- the fitting is cracked
- the adapter is overtightened
Do not assume more thread tape will fix every leak.
PTFE tape is useful on connections designed to seal through threaded pipe joints, such as some NPT connections. It is not a substitute for the flat gasket used by many IBC adapters.
Do Not Force Plastic IBC Fittings
IBC valves and adapters are commonly made from plastic. Large threads may look strong, but forcing the wrong adapter can damage them quickly.
Start connections by hand.
The fitting should engage evenly without needing heavy force.
If it becomes tight after only part of a turn, remove it and check:
- diameter
- pitch
- thread type
- male versus female connection
- damaged threads
- dirt or grit in the threads
A badly damaged valve may need replacement rather than another adapter.
Check Used Totes Before Using Them for Rainwater
Thread compatibility is only one issue when reusing an IBC.
Find out what the tote previously contained.
A tote that held an unknown substance or unsuitable chemical should not simply be rinsed and assumed suitable for household water storage.
For garden use, consider what was previously stored and whether residues could reach plants, soil, people, or animals.
For drinking-water applications, treat the tote and the rest of the rainwater system as parts of one water-quality system. A compatible fitting or clean-looking tank does not establish that collected rainwater is potable, meaning safe for drinking.
Drinking-water use requires suitable collection and storage materials, contamination control, appropriate treatment, maintenance, current laboratory testing, and compliance with applicable local requirements.
The Bottom Line
IBC threads are not all the same.
S60x6 is a very common valve outlet thread, but you may also encounter larger buttress threads, BSP, NPT, NPS, metric threads, and manufacturer-specific variations.
The simplest way to avoid buying the wrong adapter is to check:
- outside thread diameter
- thread pitch
- thread shape
- male or female connection
- which part of the tote you are connecting to
If your outlet measures close to 60 mm and has very coarse threads about 6 mm apart, S60x6 is a strong possibility. If the threads are much finer, do not assume it is S60x6 just because the outlet is described as 2 inches.
Frequently Asked Questions
What is the most common IBC tote thread?
S60x6 is one of the most common threads on IBC tote valve outlets. It is a coarse buttress thread about 60 mm across with a pitch of about 6 mm. However, it is not universal, so measure your tote before ordering an adapter.
Is an S60x6 thread the same as a 2-inch pipe thread?
No. S60x6 is a coarse IBC buttress thread. A 2-inch NPT or BSP pipe thread is much finer. They can have similar outside diameters but are not interchangeable.
How do I know if my IBC tote has S60x6 threads?
Measure the outside diameter and thread spacing. An S60x6 male thread is about 60 mm across and has approximately 6 mm between thread peaks. Its threads look much coarser than normal pipe threads.
Are 275-gallon and 330-gallon IBC tote fittings the same?
They can be, but tote capacity does not guarantee fitting compatibility. Both sizes commonly appear with similar valves, but manufacturers and replacement valves can use different threads. Check the actual connection.
Can I connect a garden hose directly to an IBC tote?
Usually you need an adapter. The adapter must match the tote valve thread on one side and the garden-hose thread on the other. Many rainwater totes use an S60x6-to-garden-hose adapter, but verify your outlet first.
Is a 2-inch camlock the same as a 2-inch IBC thread?
No. A camlock is a quick-connect coupling system. An adapter may have an IBC thread on one side and a 2-inch camlock connection on the other, but the two connection types are different.
Why does my IBC adapter start threading but then get stuck?
The threads may be different even though their diameters are similar. Stop rather than forcing the fitting. Check the diameter, thread pitch, thread type, and condition of both parts. Forcing mismatched plastic threads can damage the valve or adapter.
