ASTM A320 Bolt

ASME SA320 Grade L7 U Bolt, Grade B8M Allen Bolt, Grade A320 Flange Head Bolt, ASTM A320 B8 Hex Head Bolt, ASME SA320 Grade Eye Bolt, A320 Grade Stud Bolt.

ASTM A320 Bolts are manufactured following the specifications of stainless steel and alloy steel materials. These bolts are designed for applications that take place at low temperatures. It encompasses forged, rolled, and strain-hardened fasteners, respectively. Shree Ashapura Steel is an industry-leading manufacturer and exporter of all Astm A320 Grade L7 Bolts, which come in various sizes. The A320 standard includes the classes L7, L43, B8, and B8M, as well as classes 1 and 2. In addition, these go through quenching and tempering, carbide solution treatment, and strain hardening.

The A320 specification includes a variety of grades, each of which has its ultimate tensile strength requirement. These requirements range from 75 to 125 ksi. In addition, the a320 bolts have minimum yield strengths that range from 30 ksi to 105 ksi, and their elongation rates range from 12 per cent to 30 per cent. Carbon, phosphorus, manganese, sulphur, chromium, silicon, nickel, along with molybdenum are some elements that can be found in varying concentrations across the available grades.

About ASTM A320 Bolt

The ASTM a320 L7m nuts chemical composition include:

  • Chromium ranges can go as high as 18%.
  • Nickel ranges that can go as high as 14%.
  • Molybdenum ranges can go as high as 3%.

The A320 fasteners‘ corrosion resistance, strength, and flexibility are all thanks to the material compositions used in their construction.

There are many different uses for the ASTM A320 Stud Bolts. These bolts can be utilised in a variety of different applications. The uses for heat exchangers, boilers, condensers, power generation facilities, food processing plants, industrial applications for oil and gas, petrochemical, naval, pharmaceutical, fossil fuel, and nutraceuticals businesses, and chemical plants. We are a renowned manufacturer and supplier, and one of the products we offer is the ASTM A320 L7m Stud Bolts, in addition to other types and sizes of fasteners. Please don’t hesitate to get in touch with us if you have any questions about the A320 specification fasteners, including pricing.

Specification Of ASTM A320 Bolt

DimensionsASME B18.2.1, B18.3
Melt OriginKorea, South America, Japan, East Europe,
Mandatory RequirementsFree from Mercury & Radioactive Contamination
Additional CertificationsPED 97/ 23/ EC Certified, Merkblatt AD 2000 W2 Certified
CertificationDual Certified As per ASTM & ASME Codes
Additional RequirementsNACE MR0103 / MR0175 / ISO 15156 Compliance
Threads ConfigurationASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads

Chemical Composition ASTM A320 Bolt

ElementL7 (AISI 4140)L43 (AISI 4340)B8 (AISI 304)B8M (AISI 316)
Carbon0.37 – 0.49%0.38 – 0.43%0.08% max0.08% max
Manganese0.65 – 1.10%0.75 – 1.00%2.00% max2.00% max
Phosphorus (max)0.04%0.04%0.05%0.05%
Sulfur (max)0.04%0.04%0.03%0.03%
Silicon0.15 – 0.35%0.15 – 0.35%1.00% max1.00% max
Chromium0.75 – 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%
Molybdenum0.15 – 0.25%0.20 – 0.30% 2.00 – 3.00%

Mechanical Properties ASTM A320 Bolt

GradeSizeTensile, ksi minYield, ksi minCharpy Impact Elong, % minRA, %, min
L7up to 21/2125105-150° F1650
L43sup a 4125105-150° F1650
B8 Class 1all7530N/A3050
B8M Class 1all7530N/A3050
B8 Class 2Up to 3/4125100N/A1235
 7/8 – 111580N/A1535
 11/8 – 11/410565N/A2035
 13/8 – 11/210050N/A2845
B8M Class 2Up to 3/411095N/A1545
 7/8 – 110080N/A2045
 11/8 – 11/49565N/A2545
 13/8 – 11/29050N/A  

Dimensions Of ASTM A320 Bolt

Stainless Steel Bolts Dimensions Chart :

Nominal Size
or Basic

Full-Size Body
Width Across Flats,
Width Across
Corners, G
Head Height, H BasicRadius of
Fillet, R
Nominal Thread
Length for Bolt
MaxMinMaxMin6 in. and
6 in.
7⁄80.8750.8950.8521 5⁄161.3121.2691.5161.44737⁄640.6040.5310.060.0222.25
111.0220.9761 1⁄21.51.451.7321.65343⁄640.70.5910.
1 1⁄81.1251.1491.0981 11⁄161.6881.6311.9491.8593⁄40.780.6580.
1 1⁄41.251.2771.2231 7⁄81.8751.8122.1652.06627⁄320.8760.7490.090.032.753
1 3⁄81.3751.4041.3452 1⁄162.0621.9942.3822.27329⁄320.940.810.090.0333.25
1 1⁄21.51.5311.472 1⁄42.252.1752.5982.4811.0360.9020.
1 5⁄81.6251.6581.5912 7⁄162.4382.3562.8152.6161 3⁄321.1160.9780.
1 3⁄41.751.7851.7162 5⁄82.6252.5383.0312.8931 5⁄321.1961.0540.120.043.754
1 7⁄81.8751.9121.8392 13⁄162.8122.7193.2483.0991 1⁄41.2761.130.120.0444.25
222.0391.964332.93.4643.3061 11⁄321.3881.1750.
2 1⁄42.252.3052.2143 3⁄83.3753.2623.8973.7191 1⁄21.5481.3270.190.064.755
2 1⁄22.52.5592.4613 3⁄43.753.6254.334.1331 21⁄321.7081.4790.
2 3⁄42.752.8272.7114 1⁄84.1253.9884.7634.5461 13⁄161.8691.6320.190.065.756
333.0812.9614 1⁄24.54.355.1964.95922.061.8150.
3 1⁄43.253.3353.214 7⁄84.8754.7125.6295.3722 3⁄162.2511.9360.190.066.757
3 1⁄23.53.5893.4615 1⁄45.255.0756.0625.7862 5⁄162.382.0570.
3 3⁄43.753.8583.7265 5⁄85.6255.4376.4956.1982 1⁄22.5722.2410.190.067.758
444.1113.975665.86.9286.6122 11⁄162.7642.4240.

Different Types Of ASTM A320 Bolt

Different Types Of Bolts

Application of ASTM A320 Bolt

Testing of ASTM A320 Bolt

Packing of ASTM A320 Bolt

Destination Of ASTM A320 Bolt

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