RFSO Bored O/D
RFSO Bored O/D
What is a bored O/D tube flange?
Hygienic and metric tube is specified by its outside diameter, so a tube flange for it needs a bore that matches that diameter. An RFSO bored O/D flange is a raised face slip-on flange with exactly that bore.
In our range, a DN150 flange is bored to 154mm, a DN200 to 204mm, a DN250 to 254mm and a DN300 to 304mm. Always check the bore against your tube before you order.
How is a bored O/D flange different from a standard slip-on?
A standard RFSO flange is bored for nominal bore pipe. A bored O/D flange has the same outer dimensions and drilling, but its centre bore is machined to suit the outside diameter of metric or hygienic tube instead.
That matters because the two types of pipe aren’t the same size, even when they share a DN number. Fitting a standard flange to O/D tube would leave the wrong gap, which is why this range exists.
What is the specification?
Our bored O/D flanges are EN1092-1 type 01 flanges. That is the standard’s slip-on flange, and ours have a raised face. In our product names you’ll see them as PN16/01B or PN10/01B, where PN16 or PN10 is the pressure rating, 01 is the flange type and B is the raised face.
They come in two pressure ratings, PN10 and PN16, and two grades, A182 F304/L and F316/L. That means you can match the rating to your system and choose the grade to suit the media.
Like any slip-on flange, they slide over the tube and are welded in place. The raised face is the gasket seating area, where the gasket sits between the two flanges.
When should you use a bored O/D flange?
Use them when your system is built from hygienic or metric O/D tube and fittings. We stock PN16 flanges to suit hygienic O/D pipe and fittings, and they work alongside our hygienic fittings.
If the duty doesn’t call for a full specification flange, our reduced thickness flanges are a more cost-effective option for hygienic and metric pipework.
Which related flanges are available?
Depending on your pipework, you may also need:
RFSO flanges, for standard nominal bore pipe
RFBL flanges, to close off a line
SCRD flanges, a different joining method, for threaded pipework
Flanges are also only one way to join hygienic tube. Our hygienic range includes hygienic clamp fittings and RJT fittings, which suit joints that need to be opened regularly. You can also browse by grade: 304 or 316.
What are the common ordering mistakes?
The most common mistake is ordering by DN alone. DN is a nominal size, so two flanges with the same DN can have different bores. Always check the bore against your tube’s actual outside diameter.
The second is ordering a standard slip-on for O/D tube, and the third is mixing PN10 and PN16, which differ in rating.
What should you tell us when you enquire?
The most important detail is your tube’s outside diameter, because the bore of the flange has to match it. Please tell us:
1. The tube’s outside diameter.
2. The DN size.
3. The PN rating, either PN10 or PN16.
4. The grade, either 304 or 316.
5. How many you need.
If you’re not sure of the outside diameter, measure the tube or check the specification it was bought to.
Frequently asked questions
What does bored O/D mean on a flange?
Bored O/D means the flange’s bore has been machined to suit pipe or tube measured by outside diameter, such as hygienic and metric tube, rather than standard nominal bore pipe.
What bore does a DN150 bored O/D flange have?
In our range, a DN150 flange is bored to 154mm. A DN125 is bored to 129mm, a DN200 to 204mm, a DN250 to 254mm and a DN300 to 304mm. Always check the bore against your tube’s outside diameter.
Which pressure ratings and grades are available?
We hold RFSO bored O/D flanges to EN1092-1 in PN10 and PN16, in A182 F304/L and F316/L.
Can I use a standard slip-on flange on outside diameter tube?
A standard slip-on flange is bored for nominal bore pipe, so its bore won’t match outside diameter tube. A bored O/D flange is made for that job, so check the bore against your tube before you order.
Contact Anglo Stainless for more information
If you’re not sure which bore you need, contact us with your tube’s outside diameter and a member of our team will help you choose. You can also request our brochure using the form below.
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DN300 EN1092-1 PN16/01B RFSO BORED 304MM A182 F316/LDN300 EN1092-1 PN10/01B RFSO BORED 304MM A182 F316/LDN300 EN1092-1 PN16/01B RFSO BORED 304MM A182 F304/LDN250 EN1092-1 PN10/01B RFSO BORED 254MM A182 F316/LDN250 EN1092-1 PN16/01B RFSO BORED 254MM A182 F316/LDN200 EN1092-1 PN10/01B RFSO BORED 204MM A182 F316/LDN250 EN1092-1 PN16/01B RFSO BORED 254MM A182 F304/LWhat is a bored O/D tube flange?
Hygienic and metric tube is specified by its outside diameter, so a tube flange for it needs a bore that matches that diameter. An RFSO bored O/D flange is a raised face slip-on flange with exactly that bore.
In our range, a DN150 flange is bored to 154mm, a DN200 to 204mm, a DN250 to 254mm and a DN300 to 304mm. Always check the bore against your tube before you order.
How is a bored O/D flange different from a standard slip-on?
A standard RFSO flange is bored for nominal bore pipe. A bored O/D flange has the same outer dimensions and drilling, but its centre bore is machined to suit the outside diameter of metric or hygienic tube instead.
That matters because the two types of pipe aren’t the same size, even when they share a DN number. Fitting a standard flange to O/D tube would leave the wrong gap, which is why this range exists.
What is the specification?
Our bored O/D flanges are EN1092-1 type 01 flanges. That is the standard’s slip-on flange, and ours have a raised face. In our product names you’ll see them as PN16/01B or PN10/01B, where PN16 or PN10 is the pressure rating, 01 is the flange type and B is the raised face.
They come in two pressure ratings, PN10 and PN16, and two grades, A182 F304/L and F316/L. That means you can match the rating to your system and choose the grade to suit the media.
Like any slip-on flange, they slide over the tube and are welded in place. The raised face is the gasket seating area, where the gasket sits between the two flanges.
When should you use a bored O/D flange?
Use them when your system is built from hygienic or metric O/D tube and fittings. We stock PN16 flanges to suit hygienic O/D pipe and fittings, and they work alongside our hygienic fittings.
If the duty doesn’t call for a full specification flange, our reduced thickness flanges are a more cost-effective option for hygienic and metric pipework.
Which related flanges are available?
Depending on your pipework, you may also need:
RFSO flanges, for standard nominal bore pipe
RFBL flanges, to close off a line
SCRD flanges, a different joining method, for threaded pipework
Flanges are also only one way to join hygienic tube. Our hygienic range includes hygienic clamp fittings and RJT fittings, which suit joints that need to be opened regularly. You can also browse by grade: 304 or 316.
What are the common ordering mistakes?
The most common mistake is ordering by DN alone. DN is a nominal size, so two flanges with the same DN can have different bores. Always check the bore against your tube’s actual outside diameter.
The second is ordering a standard slip-on for O/D tube, and the third is mixing PN10 and PN16, which differ in rating.
What should you tell us when you enquire?
The most important detail is your tube’s outside diameter, because the bore of the flange has to match it. Please tell us:
1. The tube’s outside diameter.
2. The DN size.
3. The PN rating, either PN10 or PN16.
4. The grade, either 304 or 316.
5. How many you need.
If you’re not sure of the outside diameter, measure the tube or check the specification it was bought to.
Frequently asked questions
What does bored O/D mean on a flange?
Bored O/D means the flange’s bore has been machined to suit pipe or tube measured by outside diameter, such as hygienic and metric tube, rather than standard nominal bore pipe.
What bore does a DN150 bored O/D flange have?
In our range, a DN150 flange is bored to 154mm. A DN125 is bored to 129mm, a DN200 to 204mm, a DN250 to 254mm and a DN300 to 304mm. Always check the bore against your tube’s outside diameter.
Which pressure ratings and grades are available?
We hold RFSO bored O/D flanges to EN1092-1 in PN10 and PN16, in A182 F304/L and F316/L.
Can I use a standard slip-on flange on outside diameter tube?
A standard slip-on flange is bored for nominal bore pipe, so its bore won’t match outside diameter tube. A bored O/D flange is made for that job, so check the bore against your tube before you order.
Contact Anglo Stainless for more information
If you’re not sure which bore you need, contact us with your tube’s outside diameter and a member of our team will help you choose. You can also request our brochure using the form below.
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