ASTM A320 L7 Stud Bolts
ASME SA 320 gr L7 Hex Bolts & Threaded Rod manufacturer in India
Buy A320 L7 Studs & ASTM A320 Grade L7 Heavy Hex Bolts in custom sizes, check ASTM A320 gr L7 Anchor Bolts, Square Head Bolts & SA 320 L7 Eye Bolts price list ex Mumbai.
ASME A320 L7 Stud Bolts of various types according to ASME A320 Grade L7 Bolts are alloy steels that are used for locations with low temperature.
ASME A320 Grade L7 Fasteners Specifications
Specifications : ASME A320 Grade L7, ASME SA320 Grade L7
Standard : DIN, ISO, JIS, GB, IS, BS, ASME
Size : 3 mm to 200 mm
Length :M02 to M33
Material : ASME A320 Grade L7 Fasteners.
ASME A320 Equivalent
L7 |
Alloy Steel, AISI 4140/ 4142 Quenched and tempered |
|---|---|
L7M |
Alloy Steel, AISI 4145 Quenched and tempered |
L43 |
Alloy Steel, AISI 4340 Quenched and tempered |
B8 Class 1 |
Stainless Steel, AISI 304, carbide solution treated |
B8 Class 2 |
Stainless Steel, AISI 304, carbide solution treated, strain hardened |
B8M Class 1 |
Stainless Steel, AISI 316, carbide solution treated |
B8M Class 2 |
Stainless Steel, AISI 316, carbide solution treated, strain hardened |
ASTM A320 Grade L7 Fasteners Chemical Composition
Element |
L7 (AISI 4140) |
L43 (AISI 4340) |
B8 (AISI 304) |
B8M (AISI 316) |
|---|---|---|---|---|
Carbon |
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 |
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 Grade L7 Studs & Bolts Mechanical Properties
Grade |
Size |
Tensile Stress, ksi, min |
Yield Stress, ksi, min |
Elong, %, min |
RA % min |
Charpy Impact 20-ft-lbf @ temp |
|---|---|---|---|---|---|---|
L7 |
Up to 2-1/2 |
125 |
105 |
16 |
50 |
-150° F |
L43 |
Up to 4 |
125 |
105 |
16 |
50 |
-150° F |
B8 Class 1 |
All |
75 |
30 |
30 |
50 |
N/A |
B8 Class 2 |
Up to 3/4 |
125 |
100 |
12 |
35 |
N/A |
7/8 - 1 |
115 |
80 |
15 |
35 |
N/A |
|
1-1/8 - 1-1/4 |
105 |
65 |
20 |
35 |
N/A |
|
1-3/8 - 1-1/2 |
100 |
50 |
28 |
45 |
N/A |
|
B8M Class 1 |
All |
75 |
30 |
30 |
50 |
N/A |
B8M Class 2 |
Up to 3/4 |
110 |
95 |
15 |
45 |
N/A |
7/8 - 1 |
100 |
80 |
20 |
45 |
N/A |
|
1-1/8 - 1-1/4 |
95 |
65 |
25 |
45 |
N/A |
|
1-3/8 - 1-1/2 |
90 |
50 |
30 |
45 |
N/A |
ASTM A320 Bolt Torque Chart
| BOLT DIA |
Torque FT-LBS | ||
| 30% Initial Torque |
70% Torque |
100% Final Torque |
|
| 1/2 | 16 | 36 | 52 |
| 9/16 | 23 | 53 | 75 |
| 5/8 | 31 | 73 | 104 |
| 3/4 | 55 | 129 | 184 |
| 7/8 | 71 | 166 | 237 |
| 1 | 107 | 249 | 356 |
| 1.1/8 | 127 | 297 | 424 |
| 1.1/4 | 179 | 417 | 596 |
| 1.3/8 | 186 | 435 | 622 |
| 1.1/2 | 246 | 574 | 821 |
| 1.9/16 | 168 | 392 | 560 |
| 1.5/8 | 191 | 445 | 636 |
| 1.3/4 | 240 | 561 | 801 |
| 1.7/8 | 298 | 696 | 994 |
| 2 | 366 | 853 | 1219 |
| 2.1/4 | 529 | 1234 | 1762 |
| 2.1/2 | 733 | 1709 | 2442 |
| 2.3/4 | 986 | 2300 | 3285 |
| 3 | 1289 | 3008 | 4297 |
| BOLT DIA |
Torque Nm | ||
| 30% Initial Torque |
70% Torque |
100% Final Torque |
|
| 1/2 | 22 | 49 | 71 |
| 9/16 | 31 | 72 | 102 |
| 5/8 | 42 | 99 | 141 |
| 3/4 | 75 | 175 | 249 |
| 7/8 | 96 | 225 | 321 |
| 1 | 145 | 338 | 483 |
| 1.1/8 | 172 | 403 | 575 |
| 1.1/4 | 243 | 565 | 808 |
| 1.3/8 | 252 | 590 | 843 |
| 1.1/2 | 334 | 778 | 1113 |
| 1.9/16 | 228 | 531 | 759 |
| 1.5/8 | 259 | 603 | 862 |
| 1.3/4 | 325 | 761 | 1086 |
| 1.7/8 | 404 | 944 | 1348 |
| 2 | 496 | 1157 | 1653 |
| 2.1/4 | 717 | 1673 | 2389 |
| 2.1/2 | 994 | 2317 | 3311 |
| 2.3/4 | 1337 | 3118 | 4454 |
| 3 | 1748 | 4078 | 5826 |