What is the average lead time?

Lead times vary depending on the complexity of the product. Generally, orders are completed within 3-5 days for standard items, 7-10 days for more intricate products, and 10-14 days for highly specialized or custom items.

How do I know which service best supports my product requirements?

Our dedicated team at Coopers Needle Works is here to offer advice and guidance tailored to your specific needs. We understand that each project is unique, and we can help you determine the most suitable services and materials to ensure your product design is fully supported from start to finish. Feel free to reach out to us for personalized assistance.

What is the difference between 304 and 316 stainless steel tube?

304 Stainless Steel: Commonly used in general applications with good corrosion resistance but less effective in chloride-rich environments. 316 Stainless Steel: Contains molybdenum, which provides enhanced corrosion resistance, especially against chlorides and chemicals, making it ideal for marine, chemical, and coastal environments.

Is there a minimum order value?

Yes, the minimum order value is £45 for domestic orders and £50 for international orders. However, if you choose to collect your order from our Birmingham location, there is no minimum order requirement.

How is postage calculated?

We use well-known, reliable carriers to ensure your order is delivered safely. Postage costs are categorized based on the size, weight, and dimensions of your order. For added convenience, all orders above £500 qualify for free postage.

Technical Glossary: Precision Stainless Steel Tubing & Hypodermic Guide

Expert Engineering Solutions for Medical, Scientific, and Industrial Sectors

At Coopers Needle Works (CNW), we are a leading ISO 9001-certified supplier specializing in high-tolerance stainless steel tubing. From 36-gauge micro-bore capillary tubes to heavy-wall industrial structural tubing, our stock is meticulously maintained to meet the rigorous demands of global manufacturing, R&D, and surgical device engineering.

Material Science: AISI Stainless Steel Grades

The performance of any tube assembly depends on its metallurgical composition. We primarily stock AISI 304 and AISI 316 alloys to ensure the highest quality for our clients.

Properties: Resistant to atmospheric corrosion; easy to weld and sanitize.

Common Applications: Disposable medical needles, fluidic sensors, and laboratory instruments.

AISI 304: High-Strength Versatility

Commonly known as 18/8 stainless, this grade offers excellent tensile strength and fabricability.

Properties: Resistant to atmospheric corrosion; easy to weld and sanitize.

Common Applications: Disposable medical needles, fluidic sensors, and laboratory instruments.

AISI 316: Surgical & Marine Grade Excellence

Enhanced with 2–3% Molybdenum, AISI 316 provides superior pitting resistance in chloride-heavy environments.

Properties: Exceptional chemical compatibility; ideal for components requiring frequent autoclave sterilization or chemical cleaning.

Common Applications: Pharmaceutical chromatography, marine sensors, and permanent surgical implants.

Key Technical Terminology

Understanding the geometry and processing of a tube is essential for proper specification.

OD (Outer Diameter)

The measurement across the extreme outside of the tube. This is the critical dimension for fitment into hubs, connectors, and compression fittings.

ID (Inner Diameter / Bore)

Also known as the bore size, the ID is the internal measurement. This is the most important factor for fluid dynamics and flow rate calculations.

Wall Thickness

The thickness of the steel between the OD and ID. This determines the pressure rating and structural rigidity of the tube.

Tolerance

The permissible limit of variation in a physical dimension. CNW specialises in tight-tolerance cutting, ensuring tubes meet exact requirements with minimal deviation.

Stainless Steel Tubing Wall Thickness Specifications

The relationship between Outer Diameter (OD) and Wall Thickness is the most critical factor in tube selection. It dictates both the internal bore (ID) for fluid flow and the structural tensile strength of the assembly.

Precision Hypodermic & Micro-Bore Tubing (14g to 36g)

Engineered for medical and scientific applications, our regular wall hypodermic tubing offers the industry-standard balance between high-pressure resistance and bore size. These are ideal for cannulae, laboratory probes, and micro-fluidic assemblies.

Thin Wall (T/W) and Ultra-Thin Wall (UTW)

These specialised profiles feature a reduced wall to maximize the internal diameter (ID) without increasing the tube's footprint. UTW tubing is the preferred choice for high-flow requirements in space-restricted surgical devices and diagnostic equipment.

Heavy-Wall Industrial, Metric & Fractional Tubing

For applications requiring extreme durability, we stock heavy-wall tubing in Fractional/Imperial (1/16" to 5/8") and Metric (0.2mm to 20.0mm) dimensions. With a high wall-to-OD ratio, these are robustly manufactured for high-pressure hydraulic lines, protective sleeves, and structural supports.

Bespoke & Intermediate "Special" Sizes

Our inventory includes hundreds of unique OD/ID combinations, filling the gaps between standard Gauge, Metric, and Fractional charts. If your project requires a unique decimal-accurate intermediate size, we stock the precise geometry to meet your bespoke engineering requirements.

Product Range

International Sizing & Calibration Standards

We supply tubing in three distinct measurement standards to support global engineering specifications:

Needle Gauge Sizes: The standard for hypodermic tubing. Remember: The higher the gauge number, the smaller the tube OD.

Metric Tubing (mm): Precise decimal sizing ranging from 0.2mm to 20.0mm.

Fractional/Imperial Tubing: Standardized inch-based dimensions (e.g., 1/16", 1/8", 1/4") common in traditional aerospace and mechanical engineering

International Distribution

Coopers Needle Works ltd