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High-Quality Standard I-Beams for Structural Use in Brooklyn, NY

Standard I-Beams in Brooklyn, NY That Are Built to Last

The standard I-beam is one of the most reliable structural components in construction. Used in everything from residential floor systems to large-scale bridge projects, I-beams have been a cornerstone of building for over a century. Eastern Steel Corporation has supplied standard I-beams in Brooklyn, NY since 1924, serving contractors and builders throughout the Northeast. With a long track record and deep regional expertise, we remain a trusted source for high-quality I-beams that meet the demands of any project.

What Is a Standard I-Beam?

A standard I-beam is a structural steel member with a cross-section shaped like the capital letter “I.” Originally produced using a rolling process first developed in France in the late 1840s, modern steel I-beams are typically fabricated with welded flanges and webs for improved strength and consistency. Thanks to advances in fabrication technology, aluminum I-beams are now also available, offering a lightweight alternative for projects where load requirements allow.

The standard I-beam differs from a wide flange I-beam (W-beam) in one key way: the flanges on a standard I-beam taper slightly toward the edges, while wide flange beams have nearly parallel flanges. This gives wide flange beams greater lateral stability, making them the preferred choice for column applications and heavy building framing. Standard I-beams, by contrast, are particularly well-suited for residential construction and lighter structural applications.

Standard I-Beam Specifications

Choosing the right beam starts with understanding the numbers. Below is a reference I-beam size chart reflecting the standard specifications carried by Eastern Steel Corporation. All of these dimensions follow AISC standards:

SizeLbs/FtFlange WidthWeb Thickness
Size3Lbs/Ft5.7Flange Width2.33Web Thickness0.17
SizeLbs/Ft7.5Flange Width2.509Web Thickness0.349
Size4Lbs/Ft7.7Flange Width2.663Web Thickness0.193
SizeLbs/Ft9.5Flange Width2.796Web Thickness0.326
Size5Lbs/Ft10Flange Width3.004Web Thickness0.214
Size6Lbs/Ft12.5Flange Width3.332Web Thickness0.232
SizeLbs/Ft17.25Flange Width3.565Web Thickness0.465
Size8Lbs/Ft18.4Flange Width4.001Web Thickness0.271
SizeLbs/Ft23Flange Width4.171Web Thickness0.441
Size10Lbs/Ft25.4Flange Width4.661Web Thickness0.311
SizeLbs/Ft35Flange Width4.944Web Thickness0.594
Size12Lbs/Ft31.8Flange Width5Web Thickness0.35
SizeLbs/Ft35Flange Width5.078Web Thickness0.428
SizeLbs/Ft40.8Flange Width5.252Web Thickness0.462
SizeLbs/Ft50Flange Width5.477Web Thickness0.687
Size15Lbs/Ft42.9Flange Width5.501Web Thickness0.411
SizeLbs/Ft50Flange Width5.64Web Thickness0.55
Size18Lbs/Ft54.7Flange Width6.001Web Thickness0.461
SizeLbs/Ft70Flange Width6.251Web Thickness0.711
Size20Lbs/Ft66Flange Width6.255Web Thickness0.505
SizeLbs/Ft75Flange Width6.385Web Thickness0.635
SizeLbs/Ft86Flange Width7.06Web Thickness0.66
SizeLbs/Ft96Flange Width7.2Web Thickness0.8
Size24Lbs/Ft80Flange Width7Web Thickness0.5
SizeLbs/Ft90Flange Width7.125Web Thickness0.625
SizeLbs/Ft100Flange Width7.245Web Thickness0.745
SizeLbs/Ft106Flange Width7.87Web Thickness0.62
SizeLbs/Ft121Flange Width8.05Web Thickness0.8

Why Beam Weight Matters in Structural Design

The weight per foot listed in an I-beam size chart directly reflects the beam’s cross-sectional area and, by extension, its load-bearing capacity.

Heavier beams typically have thicker webs and wider flanges, which increase their resistance to bending and shear forces. Selecting a beam that’s too light for the applied load can lead to deflection or structural failure over time. Conversely, over-specifying beam weight adds unnecessary cost and dead load to your structure.

Proper beam selection requires evaluating four key variables: applied force, span length, web thickness, and flange width. Each of these variables plays a critical role in determining the appropriate beam size, and overlooking any one of them can result in an under- or over-designed structure that compromises both safety and cost efficiency. These I-beam dimensions are essential to ensuring a structure is safe, cost-effective, and durable.

What Are the Advantages of I-Beams?

Steel I-beams offer several structural and economic advantages over alternative building materials such as wood, laminated veneer lumber (LVL), or concrete:

  • Pressure Resistance – I-beams withstand tremendous compressive and tensile forces, delivering reliable structural integrity across decades of use.
  • Shape Resilience – Their geometry makes them exceptionally efficient at handling shearing and bending loads in the plane of the web, providing strength relative to weight that few materials can match.
  • Customized Strength – Because I-beams can be fabricated to precise specifications, the second moment of area can be optimized for a given application, resulting in a stiffer, more efficient structure.
  • Longevity and Low Maintenance – High-quality steel resists warping, rot, and pest damage. Unlike timber, it won’t degrade under sustained load.
  • Cost-Effectiveness – The higher upfront cost of steel I-beams is offset by reduced maintenance, longer service life, and faster installation compared to many alternatives.

The Versatility of I-Beams: Understanding ASTM Grade Standards

The material grade determines yield strength, corrosion resistance, and suitability for different environments. When selecting a metal I-beam, it’s important to understand which ASTM specification applies to your project:

  • ASTM A36 – This is the most widely used structural steel grade. A36 is suitable for riveted, bolted, or welded applications in buildings and bridges, with a yield strength of approximately 36,000 psi (250 MPa).
  • ASTM A588 – ASTM A588 is similar to A36 in application, but with enhanced atmospheric corrosion resistance, making it a better fit for outdoor or exposed environments. Yield strength ranges from 42,000 to 60,000 psi (290–410 MPa).
  • ASTM A992 – This is the preferred specification for building framing. With a yield strength of 50,000–65,000 psi (340–450 MPa), A992 is commonly specified for wide flange sections in commercial and industrial construction.
  • ASTM A572 – ASTM A572 is a high-strength, low-alloy option available in five grades, with a typical yield strength of around 50,000 psi (340 MPa). It’s widely used in construction applications where higher strength-to-weight ratios are needed.
  • ASTM A709 – This covers carbon and high-strength, low-alloy steel for bridge construction, and is available in four distinct yield strength grades.

Standard I-Beam Applications

The range of projects that rely on standard I-beams is broad. Common applications include:

  • Residential Construction – I-beams can be used for floor joists, load-bearing walls, basement support beams, and lintels over door and window openings.
  • Commercial Buildings – Mezzanine framing, structural columns, and roof support systems all rely on standard I-beams.
  • Civil Engineering – I-beams can be used for bridge girders, retaining wall systems, and highway infrastructure.
  • Industrial Facilities – Overhead crane runways, equipment supports, and large warehouse frameworks all use standard I-beams.

Frequently Asked Questions

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What I-Beam Sizes Are Available at Eastern Steel Corporation?

Eastern Steel Corporation stocks standard I-beams in sizes ranging from S3 to S24, with varying weights per foot, flange widths, and web thicknesses. Custom fabrication is also available for non-standard dimensions. Contact us directly for current inventory and pricing.

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How Do I Determine the Right I-Beam Size for My Project?

Use an I-beam weight calculator as a starting point, then factor in the span length, load type (dead vs. live load), support conditions, and applicable building codes. For structural applications, always have beam selection reviewed by a licensed structural engineer.

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What ASTM Grade Should I Specify for Building Framing?

ASTM A992 is generally the recommended specification for structural framing applications, particularly for wide flange sections. For general construction and welded applications, ASTM A36 is the most common choice. Your fabricator or structural engineer can confirm the appropriate grade for your project.

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What’s the Difference Between an H-Beam vs. an I-Beam?

The main difference between an H-beam and an I-beam lies in their cross-sectional shape. An H-beam has a wider flange than an I-beam, giving it an H-shape when viewed from the end. On the other hand, an I-beam has a narrower flange and a thicker web, giving it its characteristic I-shape. This difference in shape also translates to differences in load-bearing capacity. Due to its wider flange, an H-beam can support heavier loads compared to an I-beam of the same weight.

Get the Right I-Beam for Your Project. Contact Us Today for a Quote.

Choosing the right standard I-beam comes down to understanding your load requirements, span, and the environment in which the beam will operate. With the right specifications and a reliable fabricator, steel I-beams deliver decades of structural performance with minimal maintenance.

Eastern Steel Corporation has been serving builders, contractors, and engineers in Brooklyn and the broader Northeast since 1924. Our team can help you navigate I-beam size charts, select the appropriate ASTM grade, and custom-fabricate beams to your exact specifications. Contact us today to discuss your project requirements and get a quote on I-beams for sale in Brooklyn, NY.

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