Rebar specifications, what are the rebar specifications and models?

Generally, it should include the standard grade (type code), the nominal diameter of the rebar, the nominal weight (mass), the specified length and the tolerance value of the above indicators. China's standard recommends a series of rebar with a nominal diameter of mm. The length of supply is divided into two types: fixed length and double ruler.

China's export rebar sizing sizing selection range is 6 12m, and the sizing range of Japanese rebar is; If there is no requirement in the contract, the domestic rebar is usually fixed to 9m and 12m in length.

For details, please refer to.

Which rebar model and specification are you asking, generally the rebar specifications range from small to large, from 12mm to 40mm diameter. You can make a reference.

Rebar specifications: public specifications: 8mm 10mm 12mm, 14mm, 16mm, 18mm, 22mm, 25mm, individual manufacturers can produce more than 28mm is generally high-rise thread.

As shown below:

Rebar is hot-rolled ribbed steel bar.

Colloquial name. The grade of ordinary hot-rolled steel bar consists of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words "hotrolled", "ribbed" and "bars", respectively.

Features:

The geometry of the transverse rib of the imported rebar is mainly an ordinary square thread or an ordinary oblique square thread. The geometry of the transverse rib of domestic rebar mainly includes three types: spiral, herringbone and crescent.

The ordering principle of rebar is generally based on meeting the gripping performance requirements required by engineering design, and the mechanical process performance or mechanical strength index is the main one.

Here is a spec sheet of some common standard sizes for metric threads:

1. The thread diameter is, and the pitch per millimeter is.

2. The thread diameter is 2mm, and the pitch per millimeter is.

3. The diameter of the threaded trousers is and the pitch per millimeter is.

4. The thread diameter is 3mm, and the pitch per millimeter is.

5. The thread diameter is 4mm, and the pitch per millimeter is.

6. The thread diameter is 5mm, and the pitch per millimeter is.

7. M6X1: The thread diameter is 6mm, and the pitch per millimeter is 1mm.

8. The thread diameter is 8mm, and the pitch per millimeter is.

9. The thread diameter is 10mm, and the pitch per millimeter is.

10. The thread diameter is 12mm, and the pitch per millimeter is.

The three elements of the thread:

1. Number of threads: The number of spirals forming threads is called the number of threads. There are single threads and multi-threads, and the multi-threads are evenly distributed within the profile perpendicular to the axis.

2. Pitch and guide spine sales:

The distance between adjacent teeth in the axial direction of two points on the mid-diameter line is called the pitch. On the same spiral line, the distance between the two adjacent teeth corresponding to the axial direction of the two points on the middle diameter of the Hu trace is called the lead. The relationship between the number of lines n, the pitch p, and the lead s is: s=n p.

3. Rotation direction: Looking along the axis direction, the thread that rotates clockwise becomes the right-handed thread, and the thread that rotates counterclockwise is called the left-handed thread. If the thread is vertically viewed, the visible part of the thread rising to the left is a left-handed thread, and the visible part rising to the right is a right-handed thread<>

The nominal diameter is recommended by the common specifications and standards of construction in China.

It is a series of spiral steel pipes in mm.

The length of supply is divided into two types: fixed length and double ruler. China exports rebar.

The sizing range is 6 12 m, and the sizing range of Japanese rebar is 3 5 10 m.

Generally commonly used construction seamless steel pipes.

It is used with high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30Cr Mnsi, 45Mn Mnb and other alloy steels.

Equal mild steel made from hot or cold rolling.

Seamless pipes are manufactured primarily for fluid transfer pipelines.

Seamless pipes made of medium carbon steel such as CR are used to make mechanical parts, such as stressed parts of automobiles and tractors. The seepage source is prepared for the general seamless steel pipe to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Cold rolled is delivered in heat-treated condition.

The standard size specification table of threads is as follows:1. American screws:

American screws are generally marked with numbers, such as ex: 2-56 (:2 56 teeth.

ex: 4-40 (:4 40 teeth.)

ex: 6-32 ( 6 pan 32 teeth.)

ex: 8-32 ( 8 pan 32 teeth.)

ex: 10-24 (:10 24 teeth.)

2. Inch screws:

The denominator is 8, and then the numerator is directly called.

ex: 1 8 x : 1 split thread screw x length, ppb.

ex: 5 16 x x: 2 minutes and a half screws x length, ppb.

ex: 5 32 x x : 1 minute 2 and a half centimeter screws x length, ppb.

ex: 1 4 x x : 2 points screw length, ppb.

The standard size of the thread comes from.

The standard size of ordinary screw threads is divided into more than 10 grades, and the intermediate and above bolts are made of low-carbon alloy steel or medium-carbon steel and heat-treated, commonly known as high-strength screws, and the rest are commonly referred to as ordinary screws.

French engineer Renaud saw that there were many specifications of wire ropes on hot air balloons, so he thought of a way to open 10 to the 5th power to get a number, and then multiply them to get 5 priority numbers: .