Types of Fasteners Standards Products

ASTM A320 L7 Stud Bolts Exporter

[wpseo_breadcrumb]

Specification

CHEMICAL & MECHANICAL COMPOSITION

Enquire Now

ASTM A320 L7 Stud Bolts

ASME SA320 gr L7 Hex Bolt & ASTM A320 Bolts and Nuts manufacturer in India

Manufacturer of A320 Gr L7 Material for for pressure vessels, Check SA 320 gr L7 Threaded Rod at best price Mumbai

Detailed Information

Prashaant Steel & Alloys specializes in manufacturing large caliber ASTM A320 L7 Stud Bolts. Among others, the ASTM A320 L7 Stud Bolts we make are common thanks to their superlative quality. At Prashaant Steel & Alloys Building, we are a well-equipped manufacturing facility with state-of-the-art technologies that enable us to produce industry-appreciated ASTM A320 L7 Stud Bolts. At Prashaant Steel & Alloys, we believe in consumer service and so we aim to fulfill our customers’ price and quantity demands and aspirations. Our massive inventory helps deliver bulk orders to our customers in no time. We market our products to various countries around the world and store our ASTM A320 L7 Stud Bolts in appropriate wooden boxes to avoid any damage to our product while shipping. We also include all the documents you require with our packaging. Some of the documents that we provide with our ASTM A320 L7 Stud Bolts are raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc. 

L7m bolts & nuts belong to the ASTM A320 specification which covers bolt, nuts, studs and other fasteners that are used at high temperature applications. There are classes A, B, C and D in this specification that are used in different application types. Jignesh Steel is a leading manufacturer and supplier of the different types of ASTM A320 gr l7 Studs and the L7M types. Both are similar in the chemical composition but have differences in the mechanical properties. The grade L7M has higher hardness values than the L7 bolts. The ASTM A320 Grade L7 Material has carbon, manganese, phosphorus, sulfur, silicon, 24% nickel, 13% chromium, molybdenum, titanium, aluminum, vanadium and boron in the composition. This composition allows the bolts to have excellent mechanical and corrosion resistance properties. The class D has 895MPa minimum tensile strength and 725MPa minimum yield strength while the classes A, B and C have only up to 585MPa minimum yield strength.

The elongation for all grades of ASTM A320 L7 Stud Bolts are 15%. The material also has very good hardness values. The class D has Brinell Hardness Number ranging from 248 to 321 where the other grades have from 248 to 341. The strength, corrosion resistance and the temperature resistance makes the bolts applicable in various applications. The A320 Gr L7 Hdg is quenched and tempered to get the maximum hardness for the bolts. 

ASTM A320 L7 Fasteners Specifications

ASTM A320 L7 Bolts

ANSI B18.2.1, DIN 931/ 933, ASTM A320 Grade L7M, L7, B8, B8M

Alloy Steel ASTM A320 gr L7 Hex Bolts Size Metric

  • Dia: M10 – M110
  • Length: 12 – 1200MM

A320 L7 Hex Bolts Size Inch

  • Dia: 1/2″ – 4.0″
  • Length: 1/2″ – 52″

ASTM A320 Grade L7 Alloy Steel Eye Bolts Metric Size

  • Dia: M10 – M48

A320 Grade L7 Stud Bolt Metric Size

  • Dia: M10 – M110
  • Length: 12 mm – 6000 mm

Grade L7 Alloy Steel Stud Bolt Inch

  • Dia: 1/2″ – 4.1/2″
  • Length: 1/2″ – 236″

ASTM A320 L7 Carbon Steel Hex Nut (DIA)

  • Metric: M6 – M110
  • Inch: 1/4″ – 4.5″

ASME SA320 L7 Plain Washer (DIA)

  • Metric: M6 – M110
  • Inch: 1/2″ – 4.1/2″

ASTM A320 L7 Stud Bolts International Standard

IS, ANSI, ASTM DIN, ISO, JIS, GB, ASME, BS, UNI

AISI 4140 A320 L7 Bolts Standard Sizes

M10, M4, M16, M36 M2.5, M6, M30, M12, M8, M14, M2, M3, M20, M24, M5 to M160

ASTM A320 Grade L7 Fasteners Threads

BSF, UNF METRIC, UNC, UNEF, BSW or as required

ASME/ ANSI – American Standard ASTM A320 L7 Stud Bolts

  • ANSI B 28.2.4 1M
  • ANSI B 18.2.4 2M
  • ASME B18.5
  • ASME B18.2.2

DIN German Standard ASTM A320 L7 Stud Bolts

DIN 933, DIN 931, DIN 970, DIN 934

ISO Standard SA 320 L7 Bolts

ISO 4033, : ISO 4032, JIS standards

ASTM A320 Gr L7 Bolts / Screws Head Drive

Phillips, Slotted, Phillips/Slot, Six-Lobe

MTC (Manufacturer Test Certificate)

EN 10204 / 3.1, Merkblatt AD 2000 W2 and PED 97/23/EC Certified, NACE MR0175 / MR0103 /ISO 15156 Compliance

SA 320 Gr L7 Nut Bolt Finishing 

  • Zinc white, (yellow, black, blue), black oxide,
  • Dacroment, Geometry, plated zinc-nickel, anodizing, nickel plated,
  • Stainless steel: Passivated Self-Colour, Bright Zinc Plated (BZP),
  • Hot Dip Galvanised (HDG), Sherardized, DACROMET and Mechanically Applied coating

ASME SA320 Grade L7 Fasteners Production Process

  • M2-M24: Cold Forging, hot forging
  • M24-M100, machining and CNC for Customized connecting element

SA 320 L7 Fasteners Chemical Composition

Element

L7 (AISI 4140)

L43 (AISI 4340)

B8 (AISI 304)

B8M (AISI 316)

Carbon (C)

0.37 – 0.49%

0.38 – 0.43%

0.08% max

0.08% max

Manganese

0.65 – 1.10%

0.75 – 1.00%

2.00% max

2.00% max

Phosphorus, max

0.035%

0.035%

0.045%

0.045%

Sulfur, max

0.040%

0.040%

0.030%

0.030%

Silicon

0.15 – 0.35%

0.15 – 0.35%

1.00% max

1.00% max

Chromium

0.75 – 1.20%

0.70 – 0.90%

18.0 – 20.0%

16.0 – 18.0%

Nickel (Ni)

1.65 – 2.00%

8.0 – 11.0%

10.0 – 14.0%

Molybdenum

0.15 – 0.25%

0.02 – 0.30%

2.00 – 3.00%

ASTM A320 Gr L7 Bolts Mechanical Properties

Stud Bolts Tensile Class

Stud Bolts Tensile Stress, min

Stud Bolts Yield strength, 0.2% offset, min

Elongation in 4D min, %

Reduction of Area, min, %

ksi

MPa

ksi

MPa

A, B and C

130

895

85

585

15

18

D

130

895

105

725

15

18

AME SA 320 Gr L7 Nut Bolt Equivalent Grade

  • Alloy Steel
  • AISI 4140

Relevant Material Grades:

ASTM

Grade

Description

ASTM A320

L7

AISI 4140/4142 Quenched and tempered

ASTM A320

L7M

AISI 4145 Quenched and tempered

ASTM A320

L43

AISI 4340 Quenched and tempered

ASTM A193

B8 Class 1

AISI/ SS 304, carbide solution treated

ASTM A193

B8 Class 2

AISI/ SS 304, carbide solution treated, strain hardened

ASTM A193

B8M Class 1

AISI / SS 316, carbide solution treated

ASTM A193

B8M Class 2

AISI/ SS 316, carbide solution treated, strain hardened

ASTM A320 L7 Stud Bolts Torque Chart

ASTM A320 Grade L7 Stud Bolts Torque FT-LBS- Cold Service (Not for PTFE Coated Stud Bolts and nuts)

BOLT

SIZE

Torque FT-LBS

30% Initial

Torque

70%

Torque

100% Final

Torque

1/2 23 54 76
9/16 33 77 110
5/8 46 107 152
3/4 81 189 270
7/8 131 305 436
1 196 457 653
1.1/8 287 671 958
404 943 1348
1.3/8 854 1279 1828
725 1689 2413
1.9/16 824 1922 2746
1.5/8 935 2183 3118
1177 2747 3924
1.7/8 1461 3410 4871
2 1792 4180 5972
2590 6044 8635
3590 8376 11966
ASTM A320 Grade L7 Stud Bolts Torque Nm- Cold Service (Not for PTFE Coated Stud Bolts and nuts)

BOLT

SIZE

Torque Nm

30% Initial

Torque

70%

Torque

100% Final

Torque

1/2

31

73

103

9/16

45

104

149

5/8

62

145

206

3/4

110

256

366

7/8

178

414

591

1

266

620

885

1.1/8

389

910

1299

548

1279

1828

1.3/8

1158

1734

2478

983

2290

3272

1.9/16

1117

2606

3723

1.5/8

1268

2960

4227

1596

3724

5320

1.7/8

1981

4623

6604

2

2430

5667

8097

3512

8195

11707

4867

11356

16224

ASTM A320 L7 PTFE Coated Stud Bolts and nuts Torque FT-LBS (Cold Service)

BOLT

SIZE

Torque FT-LBS

30% Initial

Torque

70%

Torque

100% Final

Torque

1/2

17

40

57

9/16

25

58

83

5/8

34

80

114

3/4

61

142

203

7/8

98

229

327

1

147

343

490

1.1/8

216

503

719

303

707

1011

1.3/8

411

959

1371

543

1267

1809

1.9/16

618

1441

2059

1.5/8

702

1637

2339

883

2060

2943

1.7/8

1096

2557

3653

2

1344

3135

4479

1943

4533

6476

2692

6282

8974

SA 320 Grade L7 PTFE Coated Stud Bolts and nuts Torque Nm (Cold Service)

BOLT

SIZE

Torque Nm

30% Initial

Torque

70%

Torque

100% Final

Torque

1/2

23

54

77

9/16

34

79

113

5/8

46

108

155

3/4

83

193

275

7/8

133

310

443

1

199

465

664

1.1/8

293

682

975

411

959

1371

1.3/8

557

1300

1859

736

1718

2453

1.9/16

838

1954

2792

1.5/8

952

2219

3171

1197

2793

3990

1.7/8

1486

3467

4953

2

1822

4250

6073

2634

6146

8780

3650

8517

12167

ASTM A320 L7 Stud Bolts & Nuts Hardness

Grade Class

Brinell Hardness No.

Approx Rockwell Hardness B & C

minimum

maximum

A, B and C

248 – 341

24 HRC

27 HRC

D

248 – 321

24 HRC

35 HRC

 

ASTM A320 Grade L7 Tensile Class

Class A

Class B

Class C

Class D

ASTM A320 Gr L7 Stud Bolts & Nuts Stress Rupture Requirements

Class

Test Temperature °F [°C]

Stress, minimum

Time to Rupture, min, h [Note]

Elongation, min, %

ksi

Mpa

A, B and C

1200 [650]

56

385

100

5

D

1200 [650]

40

275

100

5

Our Products

Related Products
Call Now ButtonCALL NOW