Our approach is designed to maximizing steel productivity and operational efficiency.
CoreMet Steel
Nominal Bore Tube Supplier UK & Global
CoreMet Steel is a trusted nominal bore tube supplier in the UK and worldwide, providing high-quality NB tubes for construction, engineering, and fluid conveyance applications.
Our nominal bore tubes (NB tubes) are recognised for strength, consistency, and durability, making them ideal for conveying fluids, fabrication, and general structural use.
What Is a Nominal Bore Tube?
A Nominal Bore Tube (NB Tube) is a steel tube where the size is defined by its nominal bore rather than the outside diameter. The nominal bore refers to the approximate internal diameter, while the actual outside diameter and wall thickness vary depending on the tube weight or schedule.
Nominal bore tubes are commonly used in fluid conveyance, mechanical systems, and structural applications where compatibility with standard fittings, valves, and pipework is required. They are widely supplied with plain or threaded ends and are suitable for welding, cutting, and general fabrication.
Because of their standardised sizing and reliable strength, NB tubes are widely used in plumbing, gas systems, handrails, scaffolding, and general engineering applications.
Nominal Bore Tube Specifications
CoreMet Steel supplies nominal bore tubes manufactured in accordance with internationally recognised standards, ensuring consistent quality, dimensional accuracy, and dependable performance.
Common standards include:
- EN 10255 – Steel tubes for water, gas, and air
- ASTM A53 / A106 (available on request for export projects)
Typical supply options:
- Nominal bore sizes from 15NB to 150NB
- Available in light, medium, and heavy wall thicknesses
- Standard lengths of 6 m and 12 m, or cut-to-length
- Surface finishes available in self-colour (black) or galvanised
- End finishes supplied as plain, threaded, or bevelled
- Manufactured to EN tolerances for dimensional accuracy
Material certification and mill test certificates are available on request.
Typical Nominal Bore Tube Sizes
| NB Size | Outside Diameter | Wall Thickness | Length |
|---|---|---|---|
| 15 NB | 21.3 mm | 2–3 mm | 6m |
| 25 NB | 33.7 mm | 2.5–4 mm | 6m |
| 50 NB | 60.3 mm | 3–5 mm | 6m |
| 100 NB | 114.3 mm | 3–5 mm | 6m |
Why Choose CoreMet for Nominal Bore Tube?
✅ Wide Range of Sizes: We supply nominal bore tubes from 15NB to 150NB in various wall thicknesses.
✅ Quality Assurance: Manufactured to UK and international standards for reliability.
✅ Versatile Applications: Suitable for fluid transportation, handrails, frames, and fabrication.
✅ Fast Global Delivery: Keeping your projects on schedule.
✅ Global Export Service: Secure packaging with reliable shipping worldwide.
Applications of Nominal Bore Tube
Our nominal bore tubes are commonly used for:
- Fluid and gas conveyance in industrial settings
- Handrails and balustrades
- Structural frames and supports
- Scaffolding and temporary structures
- General fabrication and engineering projects
Our Nominal Bore Tube Product Range
We supply:
- Light, medium, and heavy wall thicknesses
- Galvanised and self-colour options for indoor and outdoor use
- Compliant with EN and BS standards for consistent quality
Benefits of Nominal Bore Tube
✅ Strong and durable for demanding applications
✅ Good weldability and machinability
✅ Corrosion-resistant options available
✅ Versatile for multiple industries
✅ Cost-effective for construction and fabrication
As a leading Nominal Bore Tube Supplier UK & Worldwide, we ensure consistent quality, reliable stock availability, and fast delivery for all project sizes.
Explore More from Our Merchant Bar Range
Discover our full range of merchant bar products including Flat Bars, Square Bars, Round Bars, and Channel Bars — designed to support construction, manufacturing, and industrial fabrication sectors.
Nominal Bore Tube FAQ
Common standards include EN10255, ASTM A53, and BS standards depending on the application.
Nominal bore tubes are widely used for fluid conveyance, gas systems, plumbing, handrails, and structural fabrication.
A nominal bore tube is a steel pipe where the size is defined by its nominal internal diameter rather than the exact outside diameter.
For technical data and steel design standards, visit SteelConstruction.info for more guidance on steel section applications in the UK.
get a free quote
Built for reliable steel supply.projects.trade.sourcing.partnerships.
From steel coils to fencing systems: sourcing quality materials for global buyers, projects, and distributors.