Product Specifications
| Model / Specification | M6 - M100 |
| Material | Stainless Steel |
| Nominal diameter | 6 | 8 | 10 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | |
| Thread size code | 1/8 | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1-1/4 | 1-1/2 | 2 | 2-1/2 | 3 | 4 | |
| A | Min. | 10 | 11 | 13 | 14 | 16 | 19 | 21 | 21 | 22 | 27 | 28 | 32 |
Headless Male-Female Threaded Adapter — Product Introduction
The headless male-female threaded adapter (code FB) is a forged threaded pipe fitting conforming to GB/T 14383-2021. One end is female threaded and the other end is male threaded, with no protruding head structure. It is suitable for steel piping systems with nominal sizes DN 6–DN 100 and pressure ratings Class 2000, 3000, 6000 and 9000. It is mainly used for reducing connections, thread conversion and pipeline extension in piping systems.
1. Product Features
• Headless structure design: The overall shape is cylindrical, without hexagonal or square protruding parts. After installation, it occupies little space and is suitable for piping layouts with limited space.
• Male-female thread combination: One end is female threaded and the other is male threaded, allowing direct connection with pipes or fittings having different threaded ends and realizing thread form conversion.
• Taper pipe thread sealing: The thread conforms to the 60° taper pipe thread (NPT) specified in GB/T 12716, achieving sealing through conical interference fit.
• Various material options: Common materials include 20, 16Mn, 12CrMo, 15CrMo, 12Cr1MoV, 1Cr5Mo, 06Cr19Ni10 (304), 06Cr17Ni12Mo2 (316), etc., adapting to different temperature, pressure and corrosive working conditions.
• Integrally forged: Manufactured from forgings or bars, with dense structure and high strength, suitable for high-pressure piping systems.
2. Product Advantages
• Flexible installation and strong adaptability: The headless design allows installation in narrow spaces. The male-female thread combination can connect different types of threaded fittings, solving pipeline reducing or interface conversion problems.
• Reliable sealing: The taper pipe thread, used with thread sealant or PTFE tape, forms an effective sealed connection, suitable for medium and high pressure piping systems.
• Complete pressure ratings: Covers four pressure ratings from Class 2000 to 9000, allowing flexible selection according to system pressure and meeting different working conditions.
• High standardization: As a national standard fitting, it has uniform dimensions and good interchangeability, facilitating design selection and spare parts management.
• Wide applicable media: With different materials, it is suitable for water, steam, oil, gas and various corrosive chemical media.
3. Application Scope
• Petroleum and chemical industry: Threaded connections and reducing conversions in refinery units and chemical production pipelines.
• Power and energy: Medium and high pressure piping systems such as power station boilers, steam-water pipelines and heating networks.
• Machinery and metallurgy: Pipeline connections in hydraulic lines, lubrication systems and metallurgical equipment.
• Textile and chemical fiber: Threaded pipe fitting connections in chemical fiber production units and textile machinery pipelines.
• General industrial piping: Various piping projects requiring threaded connections, limited space or thread form conversion.
