317L Round Bar

ASTM A320 L7 Studs /A 193 L7 Hex Bolts

ASTM A320 L7 STUDS /A 193 L7 HEX Bolts

ASTM A320 Stud Bolts, ASTM A320 L7 Stud Bolts, ASTM A320 B8M Class 1 Stud BoltASTM A320 Stud Bolts, ASTM A320 L7 Stud Bolts, ASTM A320 B8M Class 1 Stud Bolts, ASTM A320 B8M Class 2 Stud Bolts, A320 PTFE Coated Stud Bolts, A320 Teflon Coated Stud Bolts, ASTM A320 Xylan Coated Stud Bolts, A320 Epoxy Coated Stud Bolts, ASTM A320 Hot Dipped Galvanised Stud Bolts, A320 Cadmium Plated Stud Bolts, A320 Fluorocarbon Coated Stud Bolts, A320 Ceramic Coated Stud Bolts

Duplex Steel Stud Bolts, Super Duplex Stud Bolts, Hastelloy B3 Threaded Studs, Stainless Steel Concrete Studs, Stainless Steel Decking Studs, SS Accordion Studs, Steel Resistant Studs, Socket Cap Studs Leading Manufacturers. ASTM A350 L7 Fasteners, ASTM A350 B8M Stud bolts, ASTM A350 B8M CL2 Tap Bolt, ASTM A350 Grade B8M CL2 stud bolts, ASTM A350 Grade B8M CL2 Hex Head Bolt Supplier, B8M CL2 Socket Cap Screw, Stainless Steel ASTM A350 Carriage Bolt, ASTM A193 Steel threaded rod Supplier, Stud Bolts, B8M CL1 Anchor Bolt Exporter, ASTM A350 threaded rod, ASTM A350 Grade B8M CL2 stud bolts, ASTM A350 Gr B8M CL1 double ended stud, Machine Bolt Supplier, exporter in India

Detailed Information:

We manufacture unrivaled quality ASTM A320 L7 STUDS / A 193 L7 HEX Nuts. Ratnaexports.com is a leading manufacturer of ASTM A320 L7 STUDS / A 193 L7 HEX Nuts in India. We rigorously evaluate our products’ quality. A large area dedicated to the show and storage of ASTM A320 L7 STUD / A 193 L7 HEX Nuts. Every order strives to provide unbeatable product quality and a hassle-free purchase experience.

The best ASTM A320 L7 STUDS /A 193 L7 HEX Nuts Manufacturers & Suppliers in India include Ratnaexports.com. We make ASTM A320 Grade L7 Fasteners from high-strength material, which is desirable for manufacturing screws, bolts, studs, and nuts used in bolting applications at various elevated temperatures. The most common grade of A320 bolts is ASTM A320 Grade L7. 

Upon being subjected to a heat treatment process, bolts made from this material are highly resistant to corrosion and a wide range of environmental conditions. Designed for low-temperature service down to -100°F (-73°C), ASTM A320 L7 bolts are medium carbon alloy steel bolts quenched and tempered. ASTM A320 L7 STUDS / A 193 L7 HEX Nuts are steel alloyed with chrome, manganese, and molybdenum.

We make ASTM A320 L7 alloy steel bolts with a low carbon content, which snuff out and tempered to achieve a high tensile strength of 120,000 psi. They are also coated with a corrosion-resistant finish to prevent rust and other forms of corrosion.

In addition to being one of the leading suppliers and dealers of ASTM A320 L7 STUDS / A 193 L7 HEX Nuts in India, Ratnaexports.com has been a trusted vendor for many years as an ASTM A320 L7 STUDS / A 193 L7 HEX Nuts distributor and dealer. We use all the ASTM A320 L7 STUDS / A 193 L7 HEX Nuts for various industries and their applications, such as Mechanical, Chemical, Petrochemical, etc. They are manufactured to meet the mechanical and chemical requirements of ASTM A320. According to the design requirements and the application, each ASTM A320 Gr L7 Stud Bolt has different abilities to form various applications depending on the design requirements.

After hot-forging, the bolts undergo a type of tempering called “L7” (quenching and tempering), making them suitable for use in low-temperature environments. We mark ASTM A320 L7 bolts with the letter “L” followed by the number “7”. Aside from ASTM specifications and grades may also be marked with a manufacturer’s name or logo.

Identify the strength and hardening properties of ASTM A320 L7 bolts; we mark them with the letter “L” followed by “7”, ASTM specification and grade, and the manufacturer’s name or trademark of the manufacturer.

Regardless of whether you’re looking for the cheapest ASTM A320 L7 STUDS /A 193 L7 HEX Nuts in your area with the quickest delivery time or if you’re looking for a free sample of ASTM A320 L7 STUDS /A 193 L7 HEX Nuts, you’ve come to the right place.

Standard Specification ASTM A320 L7 Stud Bolts

ASTM A320 L7 Stud Bolts Size Range 3/8″ to 4″ Diameter (Imperial & Standard).
ASTM A320 L7 Stud Bolts Types All Thread, Double End, Single End
ASTM A320 L7 Stud Bolts Industry Standards

ANSI – American National Standards Institute: ANSI B 18.2.4 2M, ANSI B 28.2.4 1M

DIN: DIN 934, DIN 970

UTS – Unified Thread Standard: UNC, UNF, UNEF, UNS, NPT, NPTF

ISO – International Organization for Standardization: ISO 4032, ISO 4033

ASTM A320 L7 Stud Bolts Specification ASTM A320 / ASME SA320
ASTM A320 L7 Stud Bolts Grades

Carbon Steel: B7, B7M, L7

Stainless Steel:B8, B8 CL2, B8M, B8M CL2, B16

Exotic Alloys: A20, 17-4PH, Monel, Inconel, Incoloy, Hastelloy

ASTM A320 L7 Stud Bolts Surface Coating
  • PTFE Coating: Fluoropolymer, FlouroCarbon, Xylan 1000 / 1014 / 1070 / 1400 / 1424 / 1427 / 1052 / 5230 / 5250 / 5611
  • Ceramic PTFE coating: FlouroCarbon Polymer, Xylar 1 / 101 / 2 / 201, TakeCoat 1000 / TakeCoat Ceramic 1, Sermagard 1105 / Sermagard 1280, ASTM F1428
  • Silver Coating: 99.9% Pure Silver, RoHS Compliant, Matte, Semi Bright, and Bright finish, QQ-S-365, ASTM B700, AMS 2410 / 2411
  • Dacromet Coating: Dacromet 320 / 500 / ID / T, DacroBlack 107 / 127 / 135, DacroLub 15 /10, Zinc Flake Coating, Aluminium Flake Coating, ASTM F1136M, EN 13858, EN ISO 10683
  • Cadmium Plating : ElectroPlating, Metallic Coating, ASTM A165 / B766, ISO 4521, SAE AMS 2400/ 2401, QQ-P-416, PN 13.8, M-032-P
  • Zinc Phosphate Coating: AntiGalling, Basecoat for PTFE Fluorocarbon Coating, ASTM F1137 / D6280, Strong Adhesion, and Corrosion Protection
ASTM A320 L7 Stud Bolts Packaging Cartoon-Box / Wooden Pallet / Wooden Box / Thread Protector


Chemical Composition of ASTM A320 L7 Stud Bolts


L7 (AISI 4140)


0.37 – 0.49%


0.65 – 1.10%

Phosphorus, max


Sulfur, max



0.15 – 0.35%


0.75 – 1.20%



0.15 – 0.25%

Mechanical Properties of ASTM A320 L7 Stud Bolts



Tensile ksi, min

Yield, ksi, min

Elong, %, min

RA % min

Charpy Impact


@ temp


Up to 2-1/2





-150° F

ASTM A320 Recommended Nuts and Washer

Bolt Grade




A194 Grade 4 or 7


ASTM A320 Bolt Torque Chart



Torque FT-LBS

30% Initial




100% Final


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




Torque Nm

30% Initial




100% Final


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


Other Types of ASTM A320 Bolts and Nuts

SS ASTM A320 L7 Hexagon Domed Cap Nuts

ASTM A320 Mushroom Head Square Neck Bolts

ASTM A320 L7 Eye Bolts

ASTM A320 L7 Self-Locking Nut

ASTM A320 L7 Finishing Washers

ASTM A320 L7 Structural Bolts

ASTM A320 Castle Nuts

ASTM A320 Long Bolts

ASTM A320 Hexagon Coupling Nuts

SS ASTM A320 L7 U Bolts

SS ASTM A320 T-Bolts

ASTM A320 Thread Nylon Nuts

SS ASTM A320 J Bolts

ASTM A320 Steel Hex Nuts

ASTM A320 Heavy Hex Nuts

ASTM A320 Step Bolt

ASTM A320 eversible Locknuts

ASTM A320 L7 Anchor Bolts

A320 ASTM L7 Elevator Bolts

A320 Gr L7 Heavy Hex Bolts

ASTM A320 L7 Countersunk Bolts

ASTM A320 Threaded Stud Bolts

ASTM A320 L7 Carriage Bolts

ASTM A320 Double-Ended Studs

ASTM A320 T-Head Bolts

ASTM A320 L7 Structural Bolts

ASTM A320 Lag Bolt

ASTM A320 Stainless Steel Bolt

ASTM A320 Grub Screw

ASTM A320 Machine Bolt

ASTM A320 L7 Stud Bolts Application Industry

  • Agricultural
  • Automotive
  • Construction
  • Electronics
  • Food Processing
  • Heavy Machinery
  • Marine
  • Mining
  • Nuclear
  • Oil, Gas, Petroleum
  • Energy
  • Medical
  • Transportation


Countries We Export:

Afghanistan, Albania, Algeria, Andorra, Angola, Antigua-Barbuda Argentina, Armenia, Australia, Austria, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belarus, Belgium, Belize, Benin, Bhutan, Bolivia, Bosnia-Herzegovina, Botswana, Brazil, Brunei, Bulgaria, Burkina-Faso, Burundi, Côte d’Ivoire, Cabo Verde, Cambodia, Cameroon, Canada, Central African Republic, Chad, Chile, China, Colombia, Comoros, Congo (Congo-Brazzaville), Costa-Rica, Croatia, Cuba, Cyprus, Czechia (Czech Republic), Democratic Republic of the Congo, Denmark, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Estonia, Eswatini (fmr. “Swaziland”), Ethiopia, Fiji, Finland, France, Gabon, Gambia, Georgia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Holy See, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kiribati, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Lesotho, Liberia, Libya, Liechtenstein, Lithuania, Luxembourg, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Moldova, Monaco, Mongolia, Montenegro, Morocco, Mozambique, Myanmar (formerly Burma), Namibia, Nauru, Nepal, Netherlands, New Zealand, Nicaragua, North Korea, North Macedonia, Norway, Oman, Pakistan, Palau, Palestine-State, Panama, Papua, New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Romania, Russia, Rwanda, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Samoa, San Marino, Sao Tome and Principe, Saudi Arabia, Senegal, Serbia, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, Somalia, South Africa, South Korea, South Sudan, Spain, Sri Lanka, Sudan, Suriname, Sweden, Switzerland, Syria, Tajikistan, Tanzania, Thailand, Timor-Leste, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turkmenistan, Tuvalu, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States of America, Uruguay, Uzbekistan, Vanuatu, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe.

Cities We Supply:

London, New-York, Paris, Moscow, Tokyo, Dubai, Singapore, Barcelona, Los-Angeles, Madrid Rome, Chicago, Toronto, San-Francisco, Abu-Dhabi, St-Petersburg, Amsterdam, Berlin Prague, Washington,Istanbul, Las-Vegas, Doha, Seoul, Sydney, Beijing,  Miami, Munich, Milan, San-Diego, Bangkok, Vienna, Dublin, Vancouver, Boston,  Zurich,  Melbourne, Budapest, Houston, Seattle, Montreal, Hong-Kong, Frankfurt, Sao-Paulo, Tel-Aviv, Copenhagen, Calgary, Orlando, Atlanta, Dallas, Hamburg, Osaka, Lisbon, Austin, Phoenix Naples, Oslo, Denver, Stockholm, Riyadh, Delhi, Buenos Aires, San-Jose, Brussels, Portland Philadelphia, Ottawa, Helsinki, Valencia, Brisbane, Warsaw, Minneapolis, Shanghai, Lyon, Adelaide, Edmonton, Marseille, Muscat, Athens, Stuttgart, Rio-De-Janeii, Baltimore, Auckland, Cologne, New-Orlean, Kuwait-City,  Kiev, Hanover, Perth, Minsk, Bucharest, Nashville, Dusseldorf, Manchester, Sacramento, Glasgow, Mexico-City, Salt-Lake-Ci, Raleigh, Cracow