Specializing in the production of various stainless steel pipes, plates, coils, rods, pipe fittings, high nickel alloy steel products, high temperature resistant products
PRODUCTS
Threaded Tube
Category:
Threaded Tube
keywords :
Threaded Tube
Product Description
Produced by cutting or rolling threads onto plain steel pipe ends (for coupling connections), or by cold rolling internal/external helical ribs along the tube length (for enhanced heat transfer). Features reliable mechanical connection (threaded ends), or improved heat exchange efficiency (helical ribs). Available base materials: carbon steel (20#, Q235B, Q355B, ST35.8, ST45.8, J55, K55, N80), stainless steel (304, 316L), and alloy steel. Thread types (end threads): NPT, BSPT, BSPP, API (8-round, buttress), or metric. Nominal diameter: 15mm – 400mm (1/2″–16″). Wall thickness: 1.5mm – 20mm. Length: 3m – 12m (custom). For internal/external helical ribbed tube: base tube OD 16mm – 219mm, rib height 0.5mm – 3mm, rib pitch 5mm – 30mm. Surface finish: black, varnished, or galvanized. End finish: threaded with coupling, plain, or beveled. Meets ASTM A53, API 5CT, EN 10255, GB/T 8163, GB/T 12771 standards. Custom threads, lengths, and protective caps available.
Parameter
|
Product Name |
Threaded Pipe (End-Threaded Pipe / Helically Ribbed Tube) |
|
Base Tube Materials |
Carbon steel (20#, Q235B, Q355B, ST35.8, ST45.8, J55, K55, N80), stainless steel (304, 316L), alloy steel |
|
Pipe Type |
Seamless or welded (ERW, LSAW) |
|
Nominal Diameter (DN) |
15mm – 400mm (1/2″ – 16″) |
|
Outer Diameter (OD) |
21.3mm – 426mm (standard; custom up to 610mm) |
|
Wall Thickness |
1.5mm – 20mm |
|
Standard Length |
3m – 12m (custom up to 18m) |
|
End Thread Types |
NPT (60° taper), BSPT (55° taper), BSPP (parallel), API 8-round, API buttress, metric (M) |
|
Thread Direction |
Right-hand (standard), left-hand (available) |
|
Thread Gauge |
Go / No-go gauges, thread profile inspection |
|
Couplings |
Threaded couplings (same standard) supplied loose or hand-tightened |
|
Protection |
Plastic end caps on threads, rust preventive oil (optional) |
|
Surface Finish |
Black (varnished), hot-dip galvanized, or coated |
|
Helically Ribbed Tube – Base OD |
16mm – 219mm |
|
Helically Ribbed Tube – Rib Height |
0.5mm – 3.0mm (internal and/or external) |
|
Helically Ribbed Tube – Rib Pitch |
5mm – 30mm |
|
Helically Ribbed Tube – Rib Type |
Helical, continuous, cold-rolled |
|
Standards Compliance (End-Threaded) |
ASTM A53, API 5CT, EN 10255, GB/T 8163, GB/T 12771 |
|
Standards Compliance (Ribbed Tube) |
GB/T 24591, customer specification |
|
Applications |
Fire protection, water/gas/oil pipelines, scaffolding, heat exchangers, boilers, condensers |
Application description:
Widely used in fire protection systems (sprinkler lines), water supply and drainage, natural gas and compressed air pipelines, scaffolding connections, and oil/gas transmission (API threaded casing and tubing). The threaded ends enable quick, reliable assembly without welding. Helically ribbed tubes (internal or external) are extensively used in heat exchangers, boilers, condensers, and economizers to enhance heat transfer efficiency and reduce fouling.
Production description
For end-threaded pipes: Plain steel pipe is cut to length, then threads are formed by rolling or cutting on one or both ends. Protective caps or couplings are applied. For helically ribbed tubes: A plain tube is passed through a cold rolling head that creates internal and/or external helical ribs. The tube is then inspected for thread/rib profile and dimensional accuracy.
Shipping Packaging
For export, threaded pipes are bundled with plastic end caps (to protect threads), interleaved separators, secured with steel straps, and packed on ISPM-15 pallets or in steel crates. Couplings may be packed separately or hand-tightened. Labels include grade, thread type, dimensions, length, and heat number for safe sea freight.
Why Choose Us?
1.Factory Strength:Direct manufacturer with CNC threading lines, cold rib rolling machines, and coupling assembly equipment, producing threaded ends (NPT, BSPT, API) on carbon steel, stainless steel, and alloy pipes from 15–400mm OD.
2.Quality Assurance:Strict control of thread profile (P1/P2), taper, length, and gauge acceptance; 100% thread gauging; hydrostatic testing available; compliant with ASTM A53, API 5CT, EN 10255, GB/T 8163.
3.Certifications & Reports:Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV) and thread inspection reports available upon request.
4.Customization & Service:Wide range of thread types (NPT, BSPT, BSPP, API 8-round, buttress), plain or galvanized finish, custom lengths, internal/external ribbed tubes for heat transfer, and fast lead times.
5.Export Packaging:Plastic end caps + interleaved separators + steel strapping + ISPM-15 pallets/steel crates + clear labeling for safe sea freight and thread protection.
FAQ
1. How to protect threaded pipe ends during storage and transport?
Always keep plastic end caps on threads. Store pipes on level wooden pallets, avoid rolling or dropping. For galvanized threaded pipes, use caps and avoid moisture. If caps are lost, wrap threads with corrosion-inhibiting tape or apply rust preventive oil before storage.
2. What is the difference between end-threaded pipe and helically ribbed (threaded) tube?
End-threaded pipe refers to tapered or parallel threads cut/rolled on pipe ends for mechanical coupling. Helically ribbed tube (often called “threaded tube” in heat exchanger context) has continuous internal or external spiral ribs cold-rolled along the tube length to increase heat transfer surface area. They serve different purposes: one for joining, the other for enhancing thermal performance.
3. Can threaded pipes be reused after disassembly from a system?
Yes, if threads are not damaged. Inspect threads for galling, deformation, or corrosion. Clean and apply fresh thread sealant or PTFE tape before reassembly. For high-pressure or critical services, replace couplings and re-check gauge fit. Do not reuse damaged threads; re-threading may weaken the pipe wall.
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HONORS AND QUALIFICATIONS
The company has sufficient inventory and complete varieties and specifications. Special materials and specifications are produced according to customer requirements and exported to Asia, the Middle East, Europe and other countries and regions. We have our own quality management systems: ISO9001, ISO14000, OHSAS18001 standards.
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We understand that our customers value quality and after-sales service most. We consistently adhere to high standards and strict requirements, striving to become your preferred partner.
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