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ASTM A320 L7 Stud Bolts

ASME SA 320 gr L7 Hex Bolts & Threaded Rod manufacturer in India

ASTM A320 Grade L7 Bolts

ASTM A320 Grade L7 Bolts

ASTM A320 L7 Nuts

ASTM A320 L7 Nuts

ASTM A320 L7 Stud Bolts

ASTM A320 L7 Stud Bolts

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