ASTM A320 L7 Stud Bolts Exporter
Specification
CHEMICAL & MECHANICAL COMPOSITION
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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
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ASTM A320 L7 Bolts |
ANSI B18.2.1, DIN 931/ 933, ASTM A320 Grade L7M, L7, B8, B8M |
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Alloy Steel ASTM A320 gr L7 Hex Bolts Size Metric |
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A320 L7 Hex Bolts Size Inch |
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ASTM A320 Grade L7 Alloy Steel Eye Bolts Metric Size |
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A320 Grade L7 Stud Bolt Metric Size |
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Grade L7 Alloy Steel Stud Bolt Inch |
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ASTM A320 L7 Carbon Steel Hex Nut (DIA) |
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ASME SA320 L7 Plain Washer (DIA) |
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ASTM A320 L7 Stud Bolts International Standard |
IS, ANSI, ASTM DIN, ISO, JIS, GB, ASME, BS, UNI |
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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 |
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ASTM A320 Grade L7 Fasteners Threads |
BSF, UNF METRIC, UNC, UNEF, BSW or as required |
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ASME/ ANSI – American Standard ASTM A320 L7 Stud Bolts |
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DIN German Standard ASTM A320 L7 Stud Bolts |
DIN 933, DIN 931, DIN 970, DIN 934 |
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ISO Standard SA 320 L7 Bolts |
ISO 4033, : ISO 4032, JIS standards |
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ASTM A320 Gr L7 Bolts / Screws Head Drive |
Phillips, Slotted, Phillips/Slot, Six-Lobe |
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MTC (Manufacturer Test Certificate) |
EN 10204 / 3.1, Merkblatt AD 2000 W2 and PED 97/23/EC Certified, NACE MR0175 / MR0103 /ISO 15156 Compliance |
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SA 320 Gr L7 Nut Bolt Finishing |
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ASME SA320 Grade L7 Fasteners Production Process |
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SA 320 L7 Fasteners Chemical Composition
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Element |
L7 (AISI 4140) |
L43 (AISI 4340) |
B8 (AISI 304) |
B8M (AISI 316) |
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Carbon (C) |
0.37 – 0.49% |
0.38 – 0.43% |
0.08% max |
0.08% max |
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Manganese |
0.65 – 1.10% |
0.75 – 1.00% |
2.00% max |
2.00% max |
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Phosphorus, max |
0.035% |
0.035% |
0.045% |
0.045% |
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Sulfur, max |
0.040% |
0.040% |
0.030% |
0.030% |
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Silicon |
0.15 – 0.35% |
0.15 – 0.35% |
1.00% max |
1.00% max |
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Chromium |
0.75 – 1.20% |
0.70 – 0.90% |
18.0 – 20.0% |
16.0 – 18.0% |
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Nickel (Ni) |
1.65 – 2.00% |
8.0 – 11.0% |
10.0 – 14.0% |
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Molybdenum |
0.15 – 0.25% |
0.02 – 0.30% |
2.00 – 3.00% |
ASTM A320 Gr L7 Bolts Mechanical Properties
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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, % |
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ksi |
MPa |
ksi |
MPa |
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A, B and C |
130 |
895 |
85 |
585 |
15 |
18 |
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D |
130 |
895 |
105 |
725 |
15 |
18 |
AME SA 320 Gr L7 Nut Bolt Equivalent Grade
- Alloy Steel
- AISI 4140
Relevant Material Grades:
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ASTM |
Grade |
Description |
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ASTM A320 |
L7 |
AISI 4140/4142 Quenched and tempered |
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ASTM A320 |
L7M |
AISI 4145 Quenched and tempered |
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ASTM A320 |
L43 |
AISI 4340 Quenched and tempered |
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ASTM A193 |
B8 Class 1 |
AISI/ SS 304, carbide solution treated |
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ASTM A193 |
B8 Class 2 |
AISI/ SS 304, carbide solution treated, strain hardened |
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ASTM A193 |
B8M Class 1 |
AISI / SS 316, carbide solution treated |
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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)
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BOLT SIZE |
Torque FT-LBS | ||
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30% Initial Torque |
70% Torque |
100% Final Torque |
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| 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 |
| 1¼ | 404 | 943 | 1348 |
| 1.3/8 | 854 | 1279 | 1828 |
| 1½ | 725 | 1689 | 2413 |
| 1.9/16 | 824 | 1922 | 2746 |
| 1.5/8 | 935 | 2183 | 3118 |
| 1¾ | 1177 | 2747 | 3924 |
| 1.7/8 | 1461 | 3410 | 4871 |
| 2 | 1792 | 4180 | 5972 |
| 2¼ | 2590 | 6044 | 8635 |
| 2½ | 3590 | 8376 | 11966 |
ASTM A320 Grade L7 Stud Bolts Torque Nm- Cold Service (Not for PTFE Coated Stud Bolts and nuts)
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BOLT SIZE |
Torque Nm |
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30% Initial Torque |
70% Torque |
100% Final Torque |
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1/2 |
31 |
73 |
103 |
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9/16 |
45 |
104 |
149 |
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5/8 |
62 |
145 |
206 |
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3/4 |
110 |
256 |
366 |
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7/8 |
178 |
414 |
591 |
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1 |
266 |
620 |
885 |
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1.1/8 |
389 |
910 |
1299 |
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1¼ |
548 |
1279 |
1828 |
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1.3/8 |
1158 |
1734 |
2478 |
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1½ |
983 |
2290 |
3272 |
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1.9/16 |
1117 |
2606 |
3723 |
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1.5/8 |
1268 |
2960 |
4227 |
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1¾ |
1596 |
3724 |
5320 |
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1.7/8 |
1981 |
4623 |
6604 |
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2 |
2430 |
5667 |
8097 |
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2¼ |
3512 |
8195 |
11707 |
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2½ |
4867 |
11356 |
16224 |
ASTM A320 L7 PTFE Coated Stud Bolts and nuts Torque FT-LBS (Cold Service)
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BOLT SIZE |
Torque FT-LBS |
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30% Initial Torque |
70% Torque |
100% Final Torque |
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1/2 |
17 |
40 |
57 |
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9/16 |
25 |
58 |
83 |
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5/8 |
34 |
80 |
114 |
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3/4 |
61 |
142 |
203 |
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7/8 |
98 |
229 |
327 |
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1 |
147 |
343 |
490 |
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1.1/8 |
216 |
503 |
719 |
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1¼ |
303 |
707 |
1011 |
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1.3/8 |
411 |
959 |
1371 |
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1½ |
543 |
1267 |
1809 |
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1.9/16 |
618 |
1441 |
2059 |
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1.5/8 |
702 |
1637 |
2339 |
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1¾ |
883 |
2060 |
2943 |
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1.7/8 |
1096 |
2557 |
3653 |
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2 |
1344 |
3135 |
4479 |
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2¼ |
1943 |
4533 |
6476 |
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2½ |
2692 |
6282 |
8974 |
SA 320 Grade L7 PTFE Coated Stud Bolts and nuts Torque Nm (Cold Service)
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BOLT SIZE |
Torque Nm |
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30% Initial Torque |
70% Torque |
100% Final Torque |
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1/2 |
23 |
54 |
77 |
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9/16 |
34 |
79 |
113 |
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5/8 |
46 |
108 |
155 |
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3/4 |
83 |
193 |
275 |
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7/8 |
133 |
310 |
443 |
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1 |
199 |
465 |
664 |
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1.1/8 |
293 |
682 |
975 |
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1¼ |
411 |
959 |
1371 |
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1.3/8 |
557 |
1300 |
1859 |
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1½ |
736 |
1718 |
2453 |
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1.9/16 |
838 |
1954 |
2792 |
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1.5/8 |
952 |
2219 |
3171 |
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1¾ |
1197 |
2793 |
3990 |
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1.7/8 |
1486 |
3467 |
4953 |
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2 |
1822 |
4250 |
6073 |
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2¼ |
2634 |
6146 |
8780 |
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2½ |
3650 |
8517 |
12167 |
ASTM A320 L7 Stud Bolts & Nuts Hardness
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Grade Class |
Brinell Hardness No. |
Approx Rockwell Hardness B & C |
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minimum |
maximum |
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A, B and C |
248 – 341 |
24 HRC |
27 HRC |
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D |
248 – 321 |
24 HRC |
35 HRC |
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ASTM A320 Grade L7 Tensile Class |
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Class A |
Class B |
Class C |
Class D |
ASTM A320 Gr L7 Stud Bolts & Nuts Stress Rupture Requirements
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Class |
Test Temperature °F [°C] |
Stress, minimum |
Time to Rupture, min, h [Note] |
Elongation, min, % |
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ksi |
Mpa |
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A, B and C |
1200 [650] |
56 |
385 |
100 |
5 |
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D |
1200 [650] |
40 |
275 |
100 |
5 |
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