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by Tubotech Alloys INC
Female Fittings’ is a term that is also used to describe piping and tubing components Female Adaptors. Typically, they are used to join any component that possesses an external, or “male,” connection—typically male threads, a ferrule, or a spigot end. The feature that defines this component type is its internally machined recess, which functions to help seal against an opposing male component.
At Tubotech, a top piping and tubing components manufacturer in India we offer you a wide range of high-quality Female Adaptors that are designed to ensure secure, leak-proof connections in a variety of industrial piping and tubing systems.More importantly, we ensure that they are manufactured using ‘Precision Engineering’ so that they offer ‘Durability’ and ‘High-Performance’.
Above all, we make sure that all our Female Adaptors are manufactured in a manner that help meet global standards for safety, strength, and reliability.






All the specifications details of Female Adaptors based on widely used in design like Female NPT to Tube OD made from Stainless Steel 316/310S are given in the table below:
| Tube OD (in) | Thread Type | Thread Size (NPT) | Hex Size (mm) | Overall Length (mm) | Pressure Rating (bar) | Material Options |
|---|---|---|---|---|---|---|
| 1/8″ | Female NPT | 1/8″-27 | 14 | 25 | 300 | SS 304, SS 316, SS 310S |
| 1/4″ | Female NPT | 1/4″-18 | 19 | 30 | 300 | SS 304, SS 316, SS 310S |
| 3/8″ | Female NPT | 3/8″-18 | 22 | 32 | 300 | SS 304, SS 316, SS 310S |
| 1/2″ | Female NPT | 1/2″-14 | 27 | 38 | 275 | SS 304, SS 316, SS 310S |
| 3/4″ | Female NPT | 3/4″-14 | 32 | 45 | 275 | SS 304, SS 316, SS 310S |
| 1″ | Female NPT | 1″-11.5 | 41 | 52 | 250 | SS 304, SS 316, SS 310S |
| 1-1/4″ | Female NPT | 1-1/4″-11.5 | 50 | 60 | 210 | SS 304, SS 316, SS 310S |
| 1-1/2″ | Female NPT | 1-1/2″-11.5 | 55 | 65 | 200 | SS 304, SS 316, SS 310S |
| 2″ | Female NPT | 2″-11.5 | 70 | 75 | 180 | SS 304, SS 316, SS 310S |
Female Adaptors are usually created from some casual stainless steel gradings such as SS 304, SS 316, and SS 310 / 310S. The chemical contents for separate type are given in the table below:
1. Austenitic Stainless Steel- SS 304:
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Iron (Fe) | Balance |
2. Austenitic Stainless Steel (Mo-Alloyed)-SS 316:
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Iron (Fe) | Balance |
3. High-Temperature Austenitic Stainless Steel- SS 310 / 310S:
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.25 (310), ≤ 0.08 (310S) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Iron (Fe) | Balance |
There are several stainless steel grades that are used in manufacturing Equal Unions. They include SS 304, SS 316, SS 310, and SS 310S and are given in the table below:
| Property | SS 304 | SS 316 | SS 310 / 310S |
|---|---|---|---|
| Tensile Strength (MPa) | 515 – 750 | 515 – 760 | 520 – 750 |
| Yield Strength 0.2% (MPa) | ≥ 205 | ≥ 205 | ≥ 205 |
| Elongation (% in 50 mm) | ≥ 40 | ≥ 40 | ≥ 40 |
| Hardness (Brinell, HB) | ≤ 201 | ≤ 217 | ≤ 217 |
| Modulus of Elasticity (GPa) | ~193 | ~193 | ~192 |
| Impact Toughness @ Room Temp. | Excellent | Excellent | Good to Excellent |
| Operating Temp. Range (°C) | -196 to 870 | -196 to 870 | -196 to 1150 (310S) |
| Density (g/cm³) | 7.90 | 7.98 | 7.90 |
| Thermal Conductivity (W/m·K) | 16.2 | 16.3 | 14.2 |
| Specific Heat (J/kg·K) | 500 | 500 | 500 |
There are a few types and subtypes of Female Adaptors and they are given below:
These fittings are crucial in ensuring smooth, dependable, and ordinary fluid and gas waft at some stage in various high-stakes programs.
The table below focuses on the types of Female Adaptors available. It includes common thread sizes matched to corresponding tube or pipe sizes.
| Tube Outer Diameter (OD) | Thread Size (Female NPT) | Approx. Thread Diameter (in) | Approx. Hex Size (mm) | Overall Length (mm) |
|---|---|---|---|---|
| 1/8″ (3.18 mm) | 1/8″ – 27 NPT | 0.405 | 14 | 25 |
| 1/4″ (6.35 mm) | 1/4″ – 18 NPT | 0.540 | 19 | 30 |
| 3/8″ (9.53 mm) | 3/8″ – 18 NPT | 0.675 | 22 | 32 |
| 1/2″ (12.7 mm) | 1/2″ – 14 NPT | 0.840 | 27 | 38 |
| 3/4″ (19.05 mm) | 3/4″ – 14 NPT | 1.050 | 32 | 45 |
| 1″ (25.4 mm) | 1″ – 11.5 NPT | 1.315 | 41 | 52 |
| 1-1/4″ (31.75 mm) | 1-1/4″ – 11.5 NPT | 1.660 | 50 | 60 |
| 1-1/2″ (38.1 mm) | 1-1/2″ – 11.5 NPT | 1.900 | 55 | 65 |
| 2″ (50.8 mm) | 2″ – 11.5 NPT | 2.375 | 70 | 75 |
It is for the Female Adaptors made using a common stainless steel grading SS 316 that information about weight is tabulated below:
| Size (NPT Thread) | Tube OD (inch) | Approx. Weight (grams) | Approx. Weight (lbs) |
|---|---|---|---|
| 1/8″ | 1/8″ | 30 | 0.07 |
| 1/4″ | 1/4″ | 45 | 0.10 |
| 3/8″ | 3/8″ | 65 | 0.14 |
| 1/2″ | 1/2″ | 110 | 0.24 |
| 3/4″ | 3/4″ | 180 | 0.40 |
| 1″ | 1″ | 320 | 0.70 |
| 1-1/4″ | 1-1/4″ | 540 | 1.19 |
| 1-1/2″ | 1-1/2″ | 720 | 1.59 |
| 2″ | 2″ | 1200 | 2.65 |
It is because of its ‘Durability’ and its ‘High-Performance’ that Female Adaptors are used in a wide range of industrial applications. They are as follows:
There are several factors that illustrate why you must choose Tubotech, a leading piping and tubing components manufacturer in India. They are as follows:
If you're seeking dependable, high-performance equivalent Female Adaptors for your next project, look no further than Tubotech. As a fine Female Adaptors Vendor, and Female Adaptors Exporter, we are ready to copy your operations with world-class fittings and unmatched customer service
Tubotech delivers precision-engineered tubing, fittings, and fasteners with innovative solutions and customizable options. Trusted for quality and durability, we serve industries requiring reliable, high-performance piping and instrumentation products.
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