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https://civiltoday.com/civil-engineering-materials/brick/191-types-of-bricks
STANDARD BRICK SIZES IN ENGLAND
In UK, the size and width of common brick had remained constant over the centuries, however, the depth is greater than about two inches (about 51 mm) or smaller than two and a half inches (about 64 mm).
The standard dimension of a modern brick is 215 × 102.5 × 65 mm (approximately 8 5⁄8 × 4 1⁄8 × 2 5⁄8 inch), with a nominal 10 mm (3⁄8 inch). The mortar joint makes a unit dimension of 225 × 112.5 × 75 mm (9 × 4 1/2 × 3 in) for a ratio of 6 × 3: 2
STANDARD BRICK SIZES IN THE UNITED STATES
In the US, modern normal bricks (controlled by the American Society for Testing and Materials i.e. ASTM) are approximately 8 × 3 5⁄8 × 2 1⁄4 in. (203 × 92 × 57 mm).
A generally used modular brick is 7 5 /8 × 3 5 × 8 × 2 1/ inches (194 × 92 × 57 inches).
This modular brick of 7 5⁄8 with 3/8 mortar joint makes it simple to calculate the number of bricks in a given run.
STANDARD BRICK SIZES IN AUSTRALIA:
According to the Boral Company in Australia, the standard brick size (or working size) is 76 mm x 230 mm x 110 mm based on the Australian standard AS4455.
Some bricks are made with different work sizes.
Bigger bricks are sometimes used for extra economical laying and as a design characteristic either by themselves or mixed with smaller bricks.
The Larger (140 mm large x 90 mm high x 290 mm long) hollow bricks are used in cyclonic areas to permit reinforcement and grating within the wall.
Wider (150 mm large) bricks will also be used in walls requiring low sound transmission, excessive fire resistance levels and high load carrying capability, relying on the particular sound properties.
STANDARD SIZE OF BRICK IN INDIA:
In India, the usual brick size is 190 mm x 90 mm x 90 mm as per the recommendation of BIS.
With the thickness of the mortar, the dimension of the brick turns into 200 mm x 100 mm x 100 mm which is often known as the nominal size of a minor brick.
STANDARD BRICK SIZES IN NEPAL
According to the Nationwide Building Code of Nepal (NBC 205: 1994), the bricks shall be of a standard rectangular shape, burnt red, hand-made or machined and the crushing strength shall not be lower than 3.5 N / mm².
Standard brick size 240 x 115 x 57 mm with 10 mm horizontal and vertical mortar joints.
Thickness of -10 mm on length, -5 mm on width and 3 mm on thickness would be acceptable for the purpose of thick walls on this mandatory rule (MRT).