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PT INTER WORLD STEEL MILLS INDONESIA

Trusted Rebar Distributor & SNI-Certified Steel Mill Since 1971

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Inter World Steel mill premium rebar manufacturer Indonesia
ABOUT US

Trusted Rebar Distributor & Premium Steel Provider in Indonesia

Indonesia has the fourth largest population in the world and is also the world's largest island country. We are proud to be the preferred supplier for many of the largest contractors and property developers in Indonesia since 1971. 

Since its establishment in 1971, Inter World Steel Mills Indonesia (IWS) has grown into a trusted steel manufacturer and distributor serving contractors, project owners, and building material suppliers across Indonesia. As a steel mill with our own production facility, we manufacture plain and deformed reinforcing bars (premium rebar) in grades BjTP 280 and BjTS 420 & 550, available in diameters D10 to D25, all certified to SNI 2052:2024.

As a direct manufacturer, we are able to offer competitive rebar prices without multiple layers of distribution — an advantage that is difficult to match for a typical hardware store or rebar supplier. Every production batch undergoes tensile strength testing and strict quality control before shipment, ensuring the material you receive is safe for use in multi-story structures, bridges, and large-scale infrastructure projects.

Our production process follows consistent quality standards, from raw material selection and melting to final forming, with monitoring at every stage to maintain diameter consistency, tensile strength, and rib bond strength in line with SNI specifications.

Strategically located in Jakarta, IWS delivers to various regions across Indonesia. Whether you are a contractor looking for a reliable rebar distributor or want to buy construction steel directly from the manufacturer, our team is ready to prepare a quote tailored to your project's specifications and volume.

PRODUCT

DEFORMED BARS

PT. Inter World Steel Mills Indonesia "IS" marking is the definition of high grade reinforcement bars. Manufactured in accordance with Indonesia’s stringent SNI 2052:2024 industry standard.

Premium rebar plain and deformed bar SNI standard products

CONSTRUCTION PROJECTS USING IWS REBAR

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Selanjutnya
acset indonusa
astra international
intiland development
fairmont jakarta
adhi karya
sinar mas land
mrt jakarta
agung sedayu group
china state construction
jasa marga
bauer aktiengesellschaft
powerchina sinohydro
nusa raya cipta
pondok indah group
shimizu corporation
hyundai engineering & construction
total bangun persada
pp presisi
waskita karya
hutama karya
wijaya karya
kereta api indonesia
keppel land
kajima indonesia
FAQ

FREQUENTLY ASKED QUESTION

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What is structural steel?

Structural steel is a steel material used as a primary load-bearing element in construction projects, including building frames, bridges, warehouses, and industrial facilities. It is widely used due to its high strength, dimensional accuracy, and consistent quality.

To learn more about commonly used structural steel types and specifications, please refer to the IW Steel product specification page.

 

What is reinforcing steel, and what is its role in construction?

Reinforcing steel, commonly known as rebar, consists of steel bars used to strengthen reinforced concrete structures. Its primary role is to resist tensile forces, helping concrete structures withstand loads without cracking or structural failure.

Information on reinforcing steel types, sizes, and quality standards is available on the IW Steel reinforcing steel product page.

What is construction steel?

Construction steel is a broad term that refers to iron and steel materials used in construction, both for structural and supporting purposes. Common examples include reinforcing bars, structural steel profiles, hollow sections, angle bars, and steel pipes.

To explore the full range of construction steel products and their specifications, please visit the IW Steel product catalog page.

What is plain rebar, and what is it used for?

Plain rebar is a type of reinforcing steel characterized by a smooth surface and the absence of ribs. It is typically used for ties, stirrups, or secondary reinforcement to help maintain the position and alignment of the main reinforcement within concrete structures.

Details on available sizes and specifications of plain rebar can be found on the IW Steel rebar product page.

What is the difference between plain rebar and deformed rebar?

The primary difference lies in surface texture and bonding performance. Plain rebar has a smooth surface and is easier to bend, while deformed rebar features ribs that provide improved bonding with concrete, making it more suitable for primary reinforcement.

For a detailed technical comparison, you can review their specifications on the IW Steel rebar product page.

What does reinforcing steel grade mean?

Reinforcing steel grade refers to the classification of steel based on its mechanical properties, including yield strength, tensile strength, and ductility. The selected grade directly influences the load-carrying capacity and performance of reinforced concrete structures.

Information on the reinforcing steel grades used in IW Steel products is available on the Reinforcing Steel Specification page.

 

Why is reinforcing steel grade important?

The reinforcing steel grade plays a critical role in ensuring structural safety and long-term durability. Using the correct grade helps reinforced concrete structures perform as designed and reduces the risk of premature deterioration or structural issues.

For this reason, it is essential to choose reinforcing steel with clear and verified technical specifications, as listed on the IW Steel product page.

 

What is SNI rebar?

SNI rebar refers to reinforcing steel that complies with the Indonesian National Standard (SNI). This standard specifies technical requirements such as dimensions, tolerances, and mechanical properties to ensure safe and reliable use in construction projects.

Rebar specifications that comply with this standard can be reviewed on the IW Steel rebar product page.

 
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