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ASTM A320 Bolts

ASTM A320 L7 Stud Bolts Manufacturer in India


ASTM A320 Bolts

ASTM A320 Bolts

ASTM A320 L7 Stud Bolts

ASTM A320 L7 Stud Bolts


Table of Content

ASTM A320 Bolts Specification List

Standards
Designation
ASTM A320 : Grade L7M, L7, B8, B8M
Thread Requirements of Astm A320 Bolts UNC & UNF, ASME B1.1, Class 2A (Fastenal will inspect and accept parts with a 1A no-go gauge)
Astm A320 Bolts Manufacturing Process Cold Heading, Wire Drawing, Heat Treatment, Insert tapping, Inspection, Surface Plating, Packing
Astm A320 Bolts Delivery time custom product will according to special requirement, Regular product is about 7-15 days
ASTM A320 L7M Bolts Coatings Cadmium, Black Oxide, Teflon, Galvanized, Zinc, Xylan, Others Upon Request
Astm A320 Bolts Head Square, Hex, Hex flange, Round, T-head, Flat & Triangular etc
ASTM A320 L7M Bolts Neck type Square, Hex, Oval, Triangular & Knurled etc
Astm A320 Bolts Dimensions
ASME B18.3, B18.2.1
Melt Origin
South America/East Europe/Japan/Korea
Product Origin
Made in India
Astm A320 Bolts Threads Configuration
B1.13M 6h Metric Coarse Threads and ASME B1.1 2A/3A Inch Unified Threads
Astm A320 Bolts Certification
Dual Certified As per ASME & ASTM Codes
Additional Certifications
Merkblatt AD 2000 W2 Certified, PED 97/23/EC Certified
Mandatory Requirements
Free from Radioactive & Mercury Contamination
Additional Requirements
NACE MR0175 / MR0103 /ISO 15156 Compliance

ASTM Specifications of A320 Grade L7 Studs

  • ASTM A193 / A193M – 16 : Specifications for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels
  • ASTM A1082 / A1082M – 16 : Specifications for High Strength Precipitation Hardening and Duplex Stainless Steel Bolting for Special Purpose Applications
  • ASTM F2281 : Specifications for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications Designation
  • ASTM A1014 / A1014M – 16 : Specifications for Precipitation-Hardening Bolting (UNS N07718) for High Temperature Service
  • ASTM A962 / A962M – 16a : Specifications for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range
  • ASTM A638 / A638M : Specifications for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

Common Types Of ASTM A320 Grade L7 Nuts

A320 Gr L7 Heavy Hex Bolts

A320 Gr L7 Heavy Hex Bolts

ASTM A320 Lag Bolts

ASTM A320 Lag Bolts

ASTM A320 Gr. L7 Threaded Rod

ASTM A320 Gr. L7 Threaded Rod

ASME SA320 Tie Rods

ASME SA320 Tie Rods

ASTM A320 Grade L7 T Nuts

ASTM A320 Grade L7 T Nuts

ASTM A320 Allen Cap Bolt

ASTM A320 Allen Cap Bolt

L7M Serrated Flange Nuts

L7M Serrated Flange Nuts

A320 Gr L7 Self Locking Nuts

A320 Gr L7 Self Locking Nuts


Dimension Table of Astm A320 L7m Stud Bolts

Diameter (D)
Body Diameter (D)
Across the Flats (F)
Across the Corners ©
Head Height (H)
Thread Lengths (T)
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
< 6”
> 6”
1/2
0.515
0.482
0.875
0.85
1.01
0.969
0.364
0.302
1.25
1.5
5/8
0.642
0.605
1.062
1.031
1.227
1.175
0.444
0.378
1.5
1.75
3/4
0.768
0.729
1.25
1.212
1.443
1.383
0.524
0.455
1.75
2
7/8
0.895
0.852
1.438
1.394
1.66
1.589
0.604
0.531
2
2.25
1
1.022
0.976
1.625
1.575
1.876
1.796
0.7
0.591
2.25
2.5
1 1/8
1.149
1.098
1.812
1.756
2.093
2.002
0.78
0.658
2.5
2.75
1 1/4
1.277
1.223
2
1.938
2.309
2.209
0.876
0.749
2.75
3
1 3/8
1.404
1.345
2.188
2.119
2.526
2.416
0.94
0.81
3
3.25
1 1/2
1.531
1.47
2.375
2.3
2.742
2.622
1.036
0.902
3.25
3.5
1 3/4
1.785
1.716
2.75
2.662
3.175
3.035
1.196
1.054
3.75
4
2
2.039
1.964
3.125
3.025
3.608
3.449
1.388
1.175
4.25
4.5
2 1/4
2.305
2.214
3.5
3.388
4.041
3.862
1.548
1.327
4.75
5
2 1/2
2.559
2.461
3.875
3.75
4.474
4.275
1.708
1.479
5.25
5.5
2 3/4
2.827
2.711
4.25
4.112
4.907
4.688
1.869
1.632
5.75
6
3
3.081
2.961
4.625
4.475
5.34
5.102
2.06
1.815
6.25
6.

ASTM A320 Grade L7m Bolts Torque Chart

BOLTS
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

ASTM A320 Bolts Size Chart

ASTM A320 Bolts Size Chart

Chemical Element of ASTM A320 Stainless Steel Bolts

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 L7m Hex Bolts Mechanical Behaviour

Bolts Grade
Bolts Size
Bolts Tensile ksi, min
Bolts Yield, ksi, min
Bolts Elong, %, min
Bolts 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

Equivalent Grades Of A320 Gr L7 Stud

L7
AISI 4140/4142 Quenched and tempered
L7M
AISI 4145 Quenched and tempered
L43
AISI 4340 Quenched and tempered
B8 Class 1
AISI 304, carbide solution treated
B8 Class 2
AISI 304, carbide solution treated, strain hardened
B8M Class 1
AISI 316, carbide solution treated
B8M Class 2
AISI 316, carbide solution treated, strain hardened