Ferrules
What are Ferrules?
Ferrules are precision-engineered components used in instrument tubing systems to ensure leak-tight, high-pressure connections. Typically made of stainless steel or other corrosion-resistant alloys, ferrules grip the tube as the nut is tightened, creating a seal between the tube and fitting body. They are crucial in instrumentation, chemical processing, and gas distribution setups.
Asiad Steel Industries is a leading supplier of high-quality ferrules for industrial, laboratory, and instrumentation applications. Our range includes single and double ferrule designs to meet diverse pressure, temperature, and media requirements.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Outer Diameter (OD) Tubing | 1/16” to 2” (2 mm to 50 mm) |
| Wall Thickness Compatibility | Standard & heavy wall tubing | |
| Pressure Ratings | Working Pressure | Up to 6000 psi (depending on size & material) |
| Temperature Range | -196°C to +650°C (Material dependent) | |
| Ferrule Types | Configuration | Single Ferrule, Double Ferrule |
| Components | Front Ferrule, Back Ferrule | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Standards & Certifications | ASME / ANSI | ASME B31.3, ASME B31.1 |
| ASTM | ASTM A276, ASTM A479 | |
| ISO | ISO 8434-1 (Metallic tube connections), ISO 9001 | |
| Other Approvals | NACE MR0175 / ISO 15156, PED 2014/68/EU | |
| Design Features | Sealing Method | Metal-to-metal sealing with tube grip technology |
| Compatibility | Suitable for seamless & welded tubing | |
| Interchangeability | Compatible with major international brands (Swagelok, Parker, etc.)* | |
| Assembly | Easy installation, leak-tight under vibration & high pressure | |
| Coating & Surface Finish | Standard Finish | Bright Annealed, Passivated |
| Optional Finish | Electro-Polished, PTFE Coated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Ultrasonic (UT), Eddy Current | |
| Destructive Testing | Tensile, Hardness, Impact | |
| Ferrule Performance Tests | Repeated assembly/disassembly test, Vibration & leak resistance test |
Dimensions
| Tube OD (mm) | Tube OD (inch) | Ferrule Length (L, mm) | Ferrule Thickness (t, mm) | Hex Size (AF, mm) | Typical Pressure Rating (psi) |
|---|---|---|---|---|---|
| 3 | 1/8” | 4.5 | 0.8 | 8 | Up to 6000 |
| 6 | 1/4” | 6.5 | 1.0 | 11 | Up to 6000 |
| 8 | 5/16” | 7.0 | 1.2 | 12 | Up to 5500 |
| 10 | 3/8” | 8.0 | 1.2 | 14 | Up to 5500 |
| 12 | 1/2” | 9.5 | 1.5 | 19 | Up to 5000 |
| 16 | 5/8” | 11.5 | 1.5 | 22 | Up to 5000 |
| 18 | 3/4” | 13.0 | 1.6 | 27 | Up to 4500 |
| 20 | 7/8” | 14.0 | 1.8 | 30 | Up to 4500 |
| 25 | 1” | 16.0 | 2.0 | 36 | Up to 4000 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 485 – 750 | MPa (Stainless Steel, Alloy Steel, Duplex) |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 80 – 200 | HB (Brinell) depending on material |
| Elongation | ≥ 25 – 35 | % |
| Density | 7.8 – 8.3 | g/cm³ (SS & Duplex), 8.4 – 8.9 g/cm³ (Nickel alloys), 4.5 g/cm³ (Titanium) |
| Impact Toughness | ≥ 27 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa (for SS & CS), ~110 GPa (Titanium) |
| Fatigue Strength | 250 – 450 | MPa (for SS 304/316) |
| Corrosion Resistance | Excellent | (SS 316L, Duplex, Nickel alloys > CS) |
| Thermal Conductivity | 14 – 45 | W/m·K (material-dependent) |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Surface Finish | Bright Annealed, Passivated, Electro-Polished | As per ASTM / ISO standards |
| Ferrule Design | Single & Double Ferrule | As per ISO 8434-1, ASME B31.3 |
| Operating Temperature Range | -196 to 650 | °C (depending on alloy) |
| Working Pressure | Up to 6000 | psi (high-pressure instrument fittings) |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
| Nitrogen (N) | — | — | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Applications of Ferrules
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the difference between single and double ferrule fittings?
Can ferrules be reused?
Do you offer ferrules in metric sizes?
Are your ferrules compatible with major fitting brands?
