ALLLAND Boiler Steel Pipe Supply

API Thread

ALLLAND’s API Thread products strictly adhere to API standards, meeting specifications such as API 5B, API 5CT, and API 5L for use in oil pipes, casing, drill pipes, and more. These API Threads offer advantages including high precision, diverse dimensions, multiple steel grades, and comprehensive protective measures, making them highly favored in international projects. All our API Threads undergo rigorous inspection to ensure clear furnace temperature profiles, standard-compliant taper angles and pitch dimensions, guaranteeing smooth on-site installation.

Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!

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Pipe Nipple Specification

ERW Pipe Full From

API Thread is a specialized thread for oil and gas pipelines conforming to American Petroleum Institute standards, primarily used in petroleum and natural gas extraction and downhole operations. Its defining feature is the API-standard thread at the pipe end, enabling rapid connection of casing and tubing with high reliability and excellent sealing performance. Manufactured to standards, it offers enhanced compatibility and meets specifications such as API 5CT. It is widely adopted across the global oil and gas industry.

API Thread Core Features

Strict compliance with international standards such as API 5B, API 5CT, and API 5L

Excellent torque resistance and mechanical strength

Reliable threaded structure enabling airtight or non-airtight connections

Widest-used standard compatible with most pipeline systems

Sealing achievable via thread lubricants, sealing rings, etc.

Commonly used in oil and gas extraction for easy field installation.

Common API Thread Types

API Threads represent the most widely used thread standard in oil and gas pipelines, encompassing STC, LTC, BTC, NUE, EUE, API REG, IF, and NC series threads. These standards cover all specifications required for casing, tubing, and drill pipes. They offer unified standards, easy installation, and excellent compatibility.

Different pipelines utilize specific thread types, and the characteristics and distinctions of each thread are categorized below.

Surface Casing → STC
Intermediate Casing → LTC
Production Casing / Deep Wells → BTC
Tubing (Standard) → EUE
Shallow Well Tubing → NUE

Common Characteristics of API Threads

Taper: 1:16

Thread Angle: 60°

Primarily load-bearing with limited sealing capability

Emphasis on interchangeability and versatility.

Low cost, easy maintenance

Casing Thread

API STC

Full Name: Short Thread Coupling
Thread Type: API Round Thread
Characteristics: Short thread length, simple structure, lower pressure resistance, limited load capacity, not a gas-tight connection.

API LTC

Full Name: Long Thread Coupling
Thread Type: API Round Thread
Features: Long thread length with multiple threads, excellent tensile strength, suitable for deep wells, non-gas-tight thread.

API BTC

Full Name: Buttress Thread Coupling
Thread Type: Trapezoidal thread, vertical on one side
Characteristics: Strong vertical load capacity, exceptional tensile strength, suitable for high loads, non-gas-tight thread.

Tubing Threads

API NUE

Full Name: Non-Upset End
Characteristics: Equal wall thickness between body and thread section, low thread strength, limited tensile capacity.

API EUE

Full Name: External Upset End
Features: Thicker thread end wall, increased thread strength, extended service life.

Drill Pipe Threads

API Regular / IF / NC

Features: High torque capacity, suitable for repeated installation.

Among these, the mandrel process is optimal for boiler tube manufacturing. This method involves elongating the billet in a multi-stand machine to reduce wall thickness, ensuring surface quality and uniform wall thickness.

ALLLAND API Thread

As an OCTG pipe manufacturer, our facility possesses advanced API thread processing technology, enabling comprehensive pipeline production and machining workflows.

Supports diverse API thread production for varied operating conditions and pipelines. Strict adherence to standards ensures dimensional accuracy and thread engagement.

CNC High-Precision Thread Machining Capability ALLLAND employs CNC threading equipment to precisely control thread taper and profile, enhancing connection reliability and batch consistency.

100% API Go/No-Go Gauge Inspection Ensures every pipe meets API standards, guaranteeing 100% compliance with acceptance criteria.

Thread Protection and Anti-Corrosion Treatment Following thread machining, anti-rust spraying or thread grease application is performed to preserve thread precision and prevent rework or damage risks.