Acier Lachine offers a wide range of standard and special reinforcing bars for construction projects of any scale. Couple that with Acier Lachine’s competitive cut-to-measure service – and you can be sure you are in the right place to cover all your reinforcement construction needs. The rebars are cut, bent, and pre-fixed(optional) for various concrete structures and are delivered to construction sites.

Rebar (short for Reinforcing Bar), also known as reinforcement steel, is used in reinforced concrete and reinforced masonry structures. Concrete is strong under compression, but tension forces can crack it. Therefore, rebar is used as a tension device to significantly increase the tensile strength of the structure. Rebar is made from steel because steel is very strong, and because steel expands and shrinks at nearly the same rate as concrete in hot and cold weather.

For a better bond with the concrete and to reduce the risk of slippage, the rebar’s surface is covered in ribs, lugs, or indentations. See below the various patterns of the rebars’ surface.

In addition to the rebar patterns, the reinforcing bars are manufactured in different forms such as:

  • Round

  • Ribbed

  • Square-twisted
  • Stretched, twisted and ribbed

  • Ribbed and twisted


The size of the rebar used in a particular job is dependent on the amount of strength that is needed, consequently, when more strength is needed, bigger rebar is used. The Imperial Measurement categorizes the rebars by a number reflecting the solid diameter of the rebar. The numbers range from #3 (smallest) to #18 (largest). For example, The #3 bar size is 3/8″ diameter of the solid section, the #4 bar size is 4/8″ diameter of the solid section, and the #5 bar size is 5/8″ diameter of the solid section, and so on.

The house project contractors will mostly use #3, #4, and #5 rebars. The rebar size #3 is used for driveways and patios. For walls and columns, #4 rebar size should be used as they require more strength. It is better to use the #5 rebar size for footers and foundations. On the other hand, the civil engineering and industrial constructions will utilize the entire range of sizes, from the smallest #3 to the largest #18.

Please note, that the raised portion of the deformation of the rebar is not considered in measuring the rebar diameter. We need to measure across the roundsquare portion where there is no deformation

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Reinforcing Bars - Imperial Measurement

wdt_ID No. Diameter in Inches Diameter in MM Weight – Lbs./Lin. Ft. Weight – Bar of 20′ in Lbs.
1 #3 3/8″ 9.5 mm 0.376 lbs. 7.520 lbs.
2 4# 1/2″ 12.7 mm 0.668 lbs. 13.360 lbs.
3 #5 5/8″ 15.9 mm 1.043 lbs. 20.860 lbs.
4 #6 3/4″ 19.0 mm 1.502 lbs. 30.040 lbs.
5 #7 7/8″ 22.2 mm 2.045 lbs. 40.900 lbs.
6 #8 1″ 25.4 mm 2.670 lbs. 53.400 lbs.
7 #10 1 1/4″ 31.8 mm 4.303 lbs. 86.060 lbs.
No. Diameter in Inches Diameter in MM Weight – Lbs./Lin. Ft. Weight – Bar of 20′ in Lbs.

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Reinforcing Bars - Metric Measurement

wdt_ID No. Diameter in Inches Diameter in MM Weight – Lbs./Lin. Ft. Weight – Bar of 20′ in Lbs.
1 10 mm 0.390″ 11.2 mm 0.407 lbs. 8.14 lbs.
2 10 m 0.455″ 11.3 mm 0.527 lbs. 10.54 lbs.
3 12 m 0.475″ 12.06 mm 0.596 lbs. 11.92 lbs.
4 15 m 0.630″ 16.0 mm 1.056 lbs. 21.10 lbs.
5 20 m 0.768″ 19.5 mm 1.582 lbs. 31.64 lbs.
6 25 m 0.992″ 25.2 mm 2.637 lbs. 52.74 lbs.
7 30 m 1.177″ 29.9 mm 3.693 lbs. 73.84 lbs.
8 35 m 1.405″ 35.7 mm 5.276 lbs. 105.50 lbs.
9 45 m 1.720″ 43.7 mm 7.912 lbs. 158.24 lbs.
10 55 m 2.220″ 56.4 mm 13.188 lbs. 263.74 lbs.
No. Diameter in Inches Diameter in MM Weight – Lbs./Lin. Ft. Weight – Bar of 20′ in Lbs.
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Types of Steel Reinforcing Bars (Rebars) offered by Acier Lachine

The surface of the mild steel bars are plain and round in shape and are available in various sizes up to 50 mm. They are used in concrete for special purposes, such as dowels at expansion joints, where bars must slide in a metal or paper sleeve, for contraction joints in roads and runways, and for column spirals. They are easy to cut and bend without damage.

TMT Bars = Thermo Mechanically Treated Bars are hot treated bars that are high in strength used in reinforced cement concrete work. They are also part of deformed steel bars that have ribs or other patterns on the surface of the bar. Their tensile properties are higher compared to other rebars. The characteristics of the TMT Rebarsa are as follows:

  • Better ductility and malleability

  • High yield strength and toughness

  • More bonding strength

  • Earthquake resistance

  • Corrosion resistance

  • High thermal resistance

The TMT Rebars are also economical and safe in the use, don’t show the loss in strength at welding joints, and can be welded with ordinary electrodes.

Economical and safe in use
No loss in strength at welded joints
Ordinary electrodes used for welding the joints

High strength deformed bars (HSD Rebars) are cold twisted steel bars with lugs, ribs, projection, or deformation on the surface. They are extensively used for reinforcement purposes in constructions.  The characteristics of the HSD Rebars are as follows:

  • Low carbon value resulting in good ductility and strength

  • Superior bonding strength when used with concrete.

  • HSD rebars have 100% welding capability due to their low carbon content.

  • HSD rebars feature high tensile strength. They offer a great advantage in the construction process, where a lot of bending and re-bending is required.

  • Satisfactorily malleable where minimum weight and maximum strength and suitable for both compression and tension reinforcement.

High Strength Deformed Rebars also have a wide application range covering building bridges and residential, commercial, and industrial structures. 

This is the most common type of rebar and is sometimes referred to as a “black bar.” It’s incredibly versatile, but it corrodes more easily than other types, making it less than ideal in areas that are subject to high humidity or in structures frequently exposed to water.

European rebars are made of manganese, which makes them bend easily. They are not suitable for use in areas that are prone to extreme weather conditions or geological effects, such as earthquakes, hurricanes, or tornadoes. The advantage of the European rebar is its low cost.

Epoxy-coated rebars are simply black rebars coated with a thin epoxy coat. This makes them up to 1,700 times more resistant to corrosion than standard carbon steel rebars. As a result, they are often used in areas in contact with saltwater or where a corrosion problem is imminent. The only drawback is that the coating can be very delicate and any damage to the coating will minimize the resistance to corrosion, so bars should be ordered from a reputable supplier.

Stainless steel rebars tend to be expensive and are about eight times the price of epoxy-coated rebar. They are also the best rebars available for most projects because the stainless steel rebars are 1,500 times more resistant to corrosion than black bars. 

Usage of Stainless Steel Rebars has a high initial cost but is limited to a few percent of the cost of the structure.  The main advantage is that it has a low lifecycle cost. Here are the main characteristics:

  • Design similar to C-steels

  • Mixed C-steel/stainless reinforcements work well

  • Easy installation, can also be bent in the field

  • Insensitive to poor concrete quality

  • Tolerates poor workmanship (insufficient concrete cover, poor compaction, inadequate curing…)

  • No life limit

  • No maintenance

  • Allows a thinner concrete cover

  • Better fire resistance

  • 100% Recycled

Galvanized rebars are only 40 times more resistant to corrosion than black rebars. However, it is more difficult to damage the coating of a galvanized rebar. In that respect, it has more value than epoxy-coated rebar. This makes it an excellent alternative to epoxy-coated rebars if you need something less likely to corrode. Unfortunately, galvanized rebars are about 40% more expensive than epoxy-coated rebars.

Glass-Fiber-Reinforced-Polymer (GFRP) Rebars are made up of carbon fiber. As it is made up of fiber, bending is not allowed. Like carbon fiber, GFRP rebars will not corrode — ever, under any conditions. This unique advantage is achieved at a very high price. These GFRP rebars can run ten times the cost of epoxy-coated rebars.

Rebar uses in Concrete and Masonry

  • Primary reinforcement refers to the steel which is employed to guarantee the resistance needed by the structure as a whole to support the design loads.

  • Secondary reinforcement, also known as distribution or thermal reinforcement, is employed for durability and aesthetic reasons, by providing enough localized resistance to limit cracking and resist stresses caused by effects such as temperature changes and shrinkage.

  • Conferring resistance to concentrated loads by providing enough localized resistance and stiffness for a load to spread through a wider area.

  • Assisting and holding other steel bars in the correct position to accommodate their loads.

  • External steel tie bars can constrain and reinforce masonry structures, as applied to ancient structures in Rome and the Vatican.

  • Reinforced masonry: Some standard masonry units like blocks and bricks are made with voids to accommodate rebar, which is then secured in place with grout. This combination is known as reinforced masonry.

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