MS Flat Bar Sizes and Weight Chart: Complete Guide

MS flat bar weight depends mainly on its width, thickness, length, and the density of steel. For a standard theoretical calculation, weight per metre can be estimated from the cross-sectional area and steel density.

This guide walks through MS flat bar sizes and weight chart values, explains the calculation formula in plain terms, and shows worked examples so you can estimate material requirements before you order — whether that's for a single bracket or a bulk fabrication order.

What Is an MS Flat Bar?

An MS flat bar is a length of mild steel flat bar with a rectangular cross-section — flat and wide rather than round or square. It is defined by two key dimensions: width (the broader face) and thickness (the shorter face), and it is supplied in standard commercial lengths that vary by manufacturer.

Compared to other steel sections like angles, channels, or beams, a flat bar has a simple solid rectangular profile with no bends or flanges. This makes it easier to cut, weld, drill, and shape, which is why steel flat bar is widely used in general fabrication.

Typical uses of mild steel flat bar include:

• Brackets and support frames

• Gates, grills, and railings

• Machinery bases and mounting plates

• Structural bracing and stiffeners

• General engineering and repair work

Because the cross-section is uniform along its length, calculating material quantity and weight is relatively straightforward once the dimensions are known.

MS Flat Bar Sizes and Dimensions

MS flat bar sizes are typically expressed as Width × Thickness × Length. For example, "50 × 6 mm" means a bar approximately 50 mm wide and 6 mm thick, supplied in a standard length (commonly 3 to 6 metres, though this varies by supplier and stock availability).

It's worth noting that actual available sizes, tolerances, and commercial lengths can differ slightly between manufacturers and applicable specifications, so the nominal size on a quotation should always be confirmed against the supplier's product documentation before ordering.

The four factors that determine an MS flat bar's identity and weight are:

• Width — the broader dimension of the cross-section, in mm

• Thickness — the narrower dimension, in mm

• Length — the supplied or required length, usually in metres

• Cross-sectional area — width × thickness, which directly drives weight

A larger cross-sectional area means more steel per metre, and therefore a heavier bar.

MS Flat Bar Size Chart

MS Flat Bar Weight Chart

An MS flat bar weight chart is only useful when the difference between theoretical and actual weight is understood. Theoretical weight is calculated purely from nominal dimensions and length, using a fixed steel density. Actual supplied weight, on the other hand, depends on the real rolled dimensions, which are never perfectly exact.

Weight can be expressed in a few practical ways:

• Weight per metre (kg/m) — the most common reference for Indian and metric markets

• Weight per foot (kg/ft) — useful when working with imperial length measurements

• Total weight — weight per metre multiplied by the full length ordered

Actual weight can differ from theoretical weight because of manufacturing tolerances, slight variation in actual rolled width and thickness, length-cutting tolerance, and surface condition (mill scale, rust, or coating). This is why experienced buyers treat a weight chart as a planning tool, not a guaranteed delivery weight, and always confirm final weight against the supplier's mill test certificate or delivery documentation.

MS Flat Bar Weight Per Meter

Weight per metre is calculated from the cross-sectional area of the bar and the density of mild steel, which is commonly taken as approximately 7,850 kg/m³ for theoretical calculations.

Formula:

Weight (kg/m) ≈ Width (mm) × Thickness (mm) × 0.00785

Here, width and thickness are entered in millimetres, and the constant 0.00785 already accounts for the unit conversion from cubic millimetres to the density value in kg/m³, so the formula returns weight directly in kilograms per metre.

This is the same theoretical approach used across the steel industry for estimating flat bar, angle, and plate weights before actual weighment.

How to Calculate MS Flat Bar Weight

Calculating weight is a two-step process: first find the weight per metre, then multiply by the required length.

Example 1: 50 × 6 mm MS Flat Bar

Weight per metre = 50 × 6 ×

1. 00785 = 2.355 kg/m

For a 6-metre length: 2.355 × 6 = 14.13 kg

Example 2: 100 × 10 mm MS Flat Bar

Weight per metre = 100 × 10 × 0785 = 7.85 kg/m

For a 6-metre length: 7.85 × 6 = 1 kg

For a 12-metre length: 7.85 × 12 = 94.2 kg

This method works for any width and thickness combination — simply substitute the values and multiply by the required length.

MS Flat Bar Weight Per Foot

For projects working in feet rather than metres, weight per metre can be converted using the standard length conversion factor.

Formula:

Weight per foot = Weight per metre ÷ 3.28084

Example: For a 50 × 6 mm MS flat bar with a weight of 2.355 kg/m:

355 ÷ 3.28084 ≈ 0.718 kg/ft

When estimating quantities for a project, it's important to keep length units consistent throughout the calculation — mixing metres and feet midway is a common source of ordering errors.

MS Flat Bar Weight by Size

Size	Weight (kg/m)
40 × 6 mm	1.884
50 × 6 mm	2.355
65 × 6 mm	3.062
50 × 10 mm	3.925
100 × 6 mm	4.710

MS Flat Bar Weight Calculator

A simple MS flat bar weight calculator only needs a few inputs to produce a useful estimate:

Inputs required:

• Width (mm)

• Thickness (mm)

• Length (metres)

• Steel density (default 7,850 kg/m³)

Output:

• Theoretical weight per metre (kg/m)

Total theoretical weight for the specified length

Formula used: Weight (kg/m) = Width × Thickness × 0.00785, then multiplied by length in metres.

A calculator built this way is useful for quick material estimation, but it does not replace an actual weighment or a supplier's certified weight, since real-world tolerances always exist.

50x6 MS Flat Bar Weight

A 50 × 6 mm MS flat bar has a theoretical weight of approximately 2.355 kg/m, using a steel density of 7,850 kg/m³. For a 3-metre length this comes to roughly 7.07 kg, and for a 6-metre length roughly 14.13 kg. Multiply the per-metre value by the exact length required to estimate total theoretical weight for a project.

100x10 MS Flat Bar Weight

A 100 × 10 mm MS flat bar has a theoretical weight of approximately 7.85 kg/m, using the same steel density assumption. For a 6-metre length this is about 47.1 kg, and for a 12-metre length about 94.2 kg. As with all theoretical figures, the actual supplied weight should be confirmed against the manufacturer's documentation, since rolling tolerances can cause small variations.

MS Flat Bar Sizes in mm — How to Choose the Right Size?

Choosing the correct MS flat bar size depends on more than just weight. Key factors include:

• The specific application (bracket, frame, railing, machinery base, etc.)

• Required strength and expected load

• Span or unsupported length

• Fabrication method — welding, bolting, or bending

• Connection details at either end

• Available space or clearance

• Thickness needed for durability or corrosion allowance

Project drawing or specification requirements

A heavier bar is not automatically the "safer" or "better" choice. Selecting flat bar size should be based on the actual engineering requirement of the application, and for load-bearing or structural uses, this should be confirmed by a qualified engineer rather than by weight alone.

MS Flat Bar Applications

Steel flat bar is one of the most versatile sections in general fabrication because of its simple, workable profile. Common applications include:

• Fabricated brackets and mounting plates

• Structural frames and support members

• Gates, grills, and security railings

• Machinery bases and equipment stands

• General engineering and repair fabrication

• Construction components where specified in drawings

Reinforcement in fabricated assemblies, where the design calls for it

The right application depends on the project specification and load requirement, and should always be verified against the relevant drawing or engineering guidance rather than assumed from the section type alone.

IS 2062 and E250 for MS Flat Bars

IS 2062 is a widely referenced Indian standard for structural steel, and E250 is one of the grades defined within that standard, denoting a minimum yield strength specification. These terms are commonly seen in steel procurement documentation.

However, not every mild steel flat bar in the market is automatically manufactured or certified to IS 2062 E250. The applicable specification depends on how the material was produced and tested, and buyers requiring a specific grade for structural or engineering use should request supporting documentation — such as a mill test certificate — rather than assuming compliance based on the product description alone. When a project specification calls for a particular grade, this should be confirmed in writing with the supplier before the order is placed.

How to Choose MS Flat Bar for Your Project

A simple checklist can help streamline the buying process:

• Identify the application (fabrication, construction, machinery, etc.)

• Determine the required width and thickness

• Check the length requirement per piece

• Determine total quantity needed

• Calculate theoretical weight using the standard formula

• Verify the applicable steel specification (e.g., IS 2062 grade, if required)

• Compare quotations only between equivalent specifications

• Check for supporting material documentation

• Consider transportation and handling requirements

• Confirm delivery timelines and ocation before finalising the order

Buy MS Flat Bars from BuildEX

BuildEX supplies MS flat bars and other steel products for construction, fabrication, and industrial requirements. Buyers can enquire based on the required width, thickness, length, quantity, application, and delivery location.

Before placing an order, it helps to compare equivalent specifications across suppliers and confirm the required dimensions in writing, so the material received matches the actual project requirement. This is especially useful for teams sourcing material for projects in and around Visakhapatnam, Vijayawada, Guntur, Kakinada, Rajahmundry, Nellore, and other parts of Andhra Pradesh, as well as Hyderabad, where confirming local stock availability and delivery timelines in advance can save time on site.

For enquiries on MS flat bar sizes, weight estimates, and bulk quantities, visit https://www.heybuildex.com

Frequently Asked Questions

1. What is an MS flat bar?

An MS flat bar is a mild steel section with a rectangular cross-section, defined by its width, thickness, and length. It is widely used in fabrication and construction for brackets, frames, and general engineering work due to its simple, workable shape.

2. What are the common MS flat bar sizes?

Common sizes range from small sections like 25 × 3 mm to larger ones like 100 × 10 mm, covering widths from 25 mm to 100 mm and thicknesses from 3 mm to 10 mm. Availability can vary by supplier and stock.

3. How much does an MS flat bar weigh per metre?

Weight per metre depends on width and thickness and is calculated using the formula Width × Thickness × 0.00785. For example, a 50 × 6 mm bar weighs approximately 2.355 kg/m theoretically.

4. What is the MS flat bar weight calculation formula?

The standard theoretical formula is Weight (kg/m) ≈ Width (mm) × Thickness (mm) × 0.00785, based on a steel density of approximately 7,850 kg/m³.

5. How do I calculate MS flat bar weight?

Multiply the width and thickness (in mm) by 0.00785 to get weight per metre, then multiply that figure by the total length in metres to get the total theoretical weight.

6. How much does a 50×6 mm MS flat bar weigh?

A 50 × 6 mm MS flat bar weighs approximately 2.355 kg/m theoretically, using a steel density of 7,850 kg/m³. Multiply by the required length to get total weight.

7. How much does a 100×10 mm MS flat bar weigh?

A 100 × 10 mm MS flat bar weighs approximately 7.85 kg/m theoretically, using the same density assumption. For a 6-metre piece, this comes to roughly 47.1 kg.

8. How do I calculate MS flat bar weight per foot?

Divide the weight per metre by 3.28084 to convert to weight per foot. For example, a bar weighing 2.355 kg/m works out to approximately 0.718 kg/ft.