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ASTM A193 B7 Studs

ASTM A193 B7 bolts specification/manufacturers in india

ASTM A193 B7 bolts are mainly used for high pressure heat applications. These bolts are used in those pressure vessels that do not get corrosion resistance. B7 Stud bolts mainly have bare plane metal plain finish for standard type of applications.Bhalla Fasteners manufactures astm A193 B7 studs which are heavy duty bolts used in heavy  applications and supply  in USA ,UK ,Poland,Germany,Austraila.

a193 b7 material equivalent

Bhalla Fasteners b7 Stud bolts are composed of chromium molybdenum steel which is heat treated. These stud bolts are quenched and tempered with heat which are  the main factors to give them desired mechanical strength. Tensile strength of the b7 bolt are increased after certain heat treatment.

b7 bolts specification

B7 studs can easily stressed from medium to high temperatures. ASTM A193 Grade b7 studs are liquid quenched between 50 °F to 900°F and air quenched from 40° F to 900°F. These studs are used in combination with ASTM A-194 Grade 2 H UNC HEAVY HEX NUTS with one stud and 2 nuts.

astm a193 b7 equivalent material

ASTM A193 Grade B7m Bolts are zinc plated, xylon coated, hot dipped galvanized, PTFE coated according to the special requirements of customer. They are widely available in market because they are widely used in many applications.

Grade b7 studs are mainly used in construction and pipe flange connection. A193 B7 threaded rods are good for enhancing corrosion resistance of fasteners.

A193 Grade B7 Bolts have dimensions of ASME B18.2.1, B18.3.


astm a193 gr b7 a194 gr 2h and sizes

A193 Grade B7 sizes are available in both inches and mm sizes.These studs are used with A194 grade 2h nuts. Mechanical property and high temperature characteristics should be considered while selection of these bolts. Imperial sizes in standard and thread rolling diameters are available depending on how it is turned. Chemical and petroleum construction are the main industries where ASTM A193 is heavily utilized. If ASTM A193  is used in traditional application 8 threads per inch for diameter above 1 inch works best  in valves ,flanges ,pressure vessels ,bolting, piping, and fittings.

a193 gr b7 material

Chromium molybdenum alloy Steel are the standard material used in a193 B7 stud Bolt. High temperature is the main reason these bolts are considered best for use. ASTM a193 grade B7 bolts can tolerate upto 450 °Celsius temperature due to heat treated chromium molybdenum steel used in it. ASTM 193 B7 threaded rod is really long rod and is threaded on the both ends. Bhalla Fasteners is the leading manufacturer and exporter of ASTM A193 B7 stud bolts having extremely good tensile strength.

b7 stud yield strength

ASTM a193 GR B7 bolts can suffer minimum tensile strength of hundred KSI and yield strength of 75 KSI.

A193 b7 thread bolts are also called as studs. Alloy stainless steels and austenitic stainless steels are included in the use of this grades. It have a grades of B5, b6 ,B7, b8 and b8m etc.

astm a194 b7 application

This B7 studs can be used tough projects according to the extreme condition of the project requirement. This combination of ASTM A193 stud and A194 Heavy hex nut is  extremely reliable and can be used in all the petroleum equipment’s.

Surface preparation of this B7 stud bolts are done by hardness testing and nondestructive evaluation as well as ultrasonic bolt tensioning.

B7 stud bolts gives advantage when combined with A194 grade 2H nuts for maintaining steel pipe line made of carbon. Bhalla Fasteners manufactures metric size of grade B7 nuts are from M6 to M150 and ¼ to 6 inches or customised ASTM A193 bolts as per customer specific requirements.B7 threaded bolts can also be heat treated by furnace or induction of the electrical resistance method.

ASTM a193 grade B7 threaded rod are without head which is threaded from outside and contains two nuts on both side , they are used in flange connection according to their threaded pattern and design. A193 B7 bolts are specially built for construction use. This bolts have multiple material Design properties . There are numerous type of stud bolt ASTM A193 Grade B7 like continuous threaded stud bolts , flange stud bolts , double end stud bolts and tap end stud bolts.

ASTM A193 Grade B7 normally have AISI 4140 as raw material. Heat treated to 28-32 Rockwell hardness ,105,000 PSI yield these nuts are great when combined with 2H Heavy Hex Nuts..

They are also made from AISI 410 stainless steel,hence  can be easily used in corrosive environment

ASTM A194 Grade 2H Nut and  ASTM F436 are washer are recommended with B7 Studs.

Hex bolts and eye bolts are commonly produced B7 fasteners such as heavy hex Bolts, stud Bolts, Hex Screws , Anchor Bolts. Eyes bolts such as socket head Cap Screws , Counter sunk Screws ,U bolts and Square Head Bolts are part of commonly produced B7 Fasteners.

Chemical composition of this B7 Fasteners contain Carbon(0.37-0.49c), Manganese(0.65-1.10%),phosphorus(0.035% max), sulfur(0.040 % max), silicon(0.15-0.35%), Chromium(0.75-1.20%) and Molybdenum(0.15-0.25%).

Typical steel composition used for this grade are 4140,4142,4145,4140H,4142H, and 4145H.

Addition of Bi, Se, Te, and Pb is not permitted.

Bhalla Fasteners is the leading manufacturer ,supplier and exporter of ASTM A193 B7 and contact us for best quote.

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Weight Table

b7 bolts specification

Bhalla Fasteners iASTM A193 B7weight chart

Diameter
               
Length 1/2 5/8  3/4  7/8 1 1-1/8  1-1/4 1-3/8 1-1/2
3" 0.13 0.21 0.3 0.42 0.55 0.72 0.9 1.1 1.33
3-1/4" 0.14 0.22 0.33 0.46 0.6 0.78 0.97 1.19 1.44
3-1/2" 0.15 0.24 0.35 0.49 0.65 0.84 1.05 1.29 1.55
3-3/4" 0.16 0.26 0.38 0.53 0.69 0.9 1.12 1.38 1.66
4" 0.17 0.28 0.4 0.56 0.74 0.96 1.2 1.47 1.77
4-1/4" 0.18 0.29 0.43 0.6 0.79 1.02 1.27 1.56 1.88
4-1/2" 0.19 0.31 0.45 0.63 0.83 1.08 1.35 1.66 1.99
4-3/4" 0.2 0.33 0.48 0.67 0.88 1.14 1.42 1.75 2.1
5" 0.22 0.35 0.51 0.71 0.93 1.2 1.5 1.84 2.22
5-1/4" 0.23 0.36 0.53 0.74 0.97 1.26 1.58 1.93 2.33
5-1/2" 0.24 0.38 0.56 0.78 1.02 1.32 1.65 2.02 2.44
5-3/4" 0.25 0.4 0.58 0.81 1.06 1.38 1.73 2.12 2.55
6" 0.26 0.42 0.61 0.85 1.11 1.44 1.8 2.21 2.66
6-1/4" 0.27 0.43 0.63 0.88 1.16 1.5 1.88 2.3 2.77
6-1/2" 0.28 0.45 0.66 0.92 1.2 1.56 1.95 2.39 2.88
6-3/4" 0.29 0.47 0.68 0.95 1.25 1.62 2.03 2.49 2.99
7" 0.3 0.49 0.71 0.99 1.3 1.68 2.1 2.58 3.1
7-1/4" 0.31 0.5 0.73 1.02 1.34 1.74 2.18 2.67 3.21
7-1/2" 0.33 0.52 0.76 1.06 1.39 1.8 2.25 2.76 3.33
7-3/4" 0.34 0.54 0.79 1.1 1.44 1.86 2.33 2.85
Specification Table
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Chemical composition , mechanical properties, hardness and heat treatment are recommended nuts washers for Grade b7 fasteners.

 

 

Material composition of ASTM A193 Trade B7

CHEMICAL

                                 RANGE

Check variation over or under.

Studs

2H nuts

Carbon

0.36 to 0.49

0.40 minimum

0.02

Manganese

0.66 to 1.10

1.00 maximum

0.04

Phosphorus

0.035 maximum

0.04 maximum

0.005

Sulfur

0.04

0.05 maximum

0.005

Silicon

0.15 to 0.35

0.40

0.02

Chromium

0.75 to 1.20

 

0.05

Molybdenum

0.15 to 0.25

 

0.02

 

 

 

 

Description-continuous threaded stud bolts for use in high to medium temperature.

Nominal size D- is the diameter of stud bolt.

Length L- length l is measured by it’s all over length.

Points– Both end of the stud bolt shall be pointed , flat and chamfered. When flat and chamfered the diameter of the flat should not exceed the minor diameter of the thread.

Threads- Unified coarse thread series ,Class 2A for all sizes under 1 in and unified 8 thread series, class 2A for all sizes under 1 in.

Material– Material physical properties shall be specified by purchaser. And shall be required as by ASTM and ANSI specifications.

Designation – When specifying dimensions of stud bolts,it is recommended that they are given in the following order. D*l

 

TENSILE REQUIREMENTS ASTM A193 GD -B7

Diameter in inches

Minimum tempering

Temp .F

(C)

Tensile

Strength

Min. Psi

(Mpa)

Yield Point

Min. Psi.

(NPAa)

Elongation

In 2 Inches min.pct

Reduction of Area min. Pct.

2-1/2 and under

1100

(593)

125,000

(860)

105,000

(720)

 

16

 50

Over 2-1/ 2 to 4 incl

1100

(593)

115,000

(790)

95,000

(655)

16

50

 

 

 

 

 

Brinell Hardness

24 hour temperature test

Brinell hardness after test

248,352

1000°F (538°C)

179 min.