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ASTM A320 Stud Bolts - Find Best Suppliers to get Excellent Quality of Stud Bolts

ASTM A320 Stud Bolts Manufacturers & Suppliers in India, Trusted & Recognized name in the Fasteners Industry!

Manufacturer of ASTM A320 Stud Bolts in Grade ASTM A320 L7, B8M CLASS 1, B8M CLASS 2 etc.

ASTM A320 Stud Bolts covers alloy steel and stainless steel bolting material grades such as B8, B8M, L7, L7M, L43, B8, B8M, B8C, B8T, etc.,For pressure vessels, valves, flanges, and fittings for low- temperature service. The term "bolting material" as used in this specification covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts. The bars shall be hot- wrought. The material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened.

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Savoy Piping Inc. stocks ASTM A320 Stud Bolts from 3/8” - 4” diameter in Imperial Sizes: Plain (black) finish, Teflon Blue, and Cadium Plating. We also stocks B8 and B8M stud bolts. We can also provide larger stud bolts, stud bolts made from different materials (L7, L43, B8M, B8M, , Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc), as well as different coatings. While many of the larger diameter items can be made available for a next-day delivery, some of the special alloys and coatings may be subject to a longer lead time.

Material Details

ASTM A320 L7 Alloy steel AISI 4140/4142 Quenched and tempered
ASTM A320 L43 Alloy steel AISI 4340 Quenched and tempered
ASTM A320 B8 Class 1 Stainless steel AISI 304, carbide solution treated
ASTM A320 B8M Class 1 Stainless steel AISI 316, carbide solution treated
ASTM A320 B8 Class 2 Stainless steel AISI 304, carbide solution treated, strain hardened
ASTM A320 B8M Class 2 Stainless steel AISI 316, carbide solution treated, strain hardened

See Also: ASTM A320 at

ASTM A320 Stud Bolts Grades Details

Grade L7 This is the most common A320 bolt grade. A320 Grade L7 bolts and threaded studs are manufactured from alloy steel with chromium, manganese, and molybdenum. The bolts undergo a heat treating process to reach their required mechanical properties. L7 threaded studs and short, headed bolts are readily available in the marketplace. These bolts are typically bought and sold in a plain, bare metal finish. L7 bolts are available through 2-1/2” in diameter. A320 Grade L7 bolts larger than 1/2″ diameter require a Charpy impact test.

Grade B8
ASTM A320 Grade B8 Class 1 bolts and threaded studs are manufactured from AISI 304 stainless steel. These bolts are heated and then water-quenched through carbide solution treatment, or solution annealing, which ensures the bolts are corrosion resistant. A320 Grade B8 Class 2 bolts are annealed and strain hardened to achieve increased strength characteristics. These bolts do not require an impact test.

Grade B8M
ASTM A320 Grade 8M Class 1 fasteners are similar to Grade B8 but instead are manufactured from AISI 316 stainless steel as opposed to AISI 304 stainless steel. Although more expensive, type 316 stainless offers superior corrosion resistance compared to type 304 stainless. Grade B8M Class 1 fasteners require carbide solution treatment, while Class 2 fasteners require an additional strain hardening operation. A320 Grade B8M bolts also do not require an impact test.

Grade L43
ASTM A320 Grade L43 bolts and threaded studs are manufactured from AISI 4340 material and are also quenched and tempered. L43 bolts can be as large as 4” in diameter, whereas Grade L7 does not exceed 2-1/2” diameter. L43 strength and chemical properties are virtually identical to L7 but may perform more favorably with regard to Charpy impact testing.

Grade L7M
ASTM A320 Grade L7M bolts and threaded studs are also manufactured from quenched and tempered alloy steel. The mechanical properties and requirements are lower compared to L7 bolts. L7M bolts are required to have 100% hardness testing. The final heat-treatment must be performed after machining or rolling of the threads and any type of cutting. This grade is typically used in sour gas applications.

Mechanical Properties of ASTM A320 Stud Bolts

Grade Diameter Tensile, ksi, min Yield, ksi, min Charpy Impact 20-ft-lbf @ temp Elong, %, min RA, %, min
L7 Up to 212 125 105 -150° F 16 50
L43 Up to 4 125 105 -150° F 16 50
Class 1: BC, B8C, B8M, B8P, B8F, B8T, B8LN, B8MLN All 75 30 N/A 30 50
Class 1A: B8A, B8CA, B8MA, B8PA, B8FA, B8TA, B8LNA, B8MLNA All 75 30 N/A 30 50
Class 2: B8, B8C, B8P, B8F, B8T Up to 34 125 100 N/A 12 35
78 - 1 115 80 N/A 15 35
118 - 114 105 65 N/A 20 35
138 - 112 100 50 N/A 28 45
Class 2: B8M Up to 34 110 95 N/A 15 45
78 - 1 100 80 N/A 20 45
118 - 114 95 65 N/A 25 45
138 - 112 90 50 N/A 30 45

Chemical Composition of ASTM A320 Stud Bolts

Element L7 (AISI 4140) L43 (AISI 4340) B8 (AISI 304) B8M (AISI 316)
Carbon 0.38 - 0.48% 0.38 - 0.43% 0.08% max 0.08% max
Manganese 0.75 - 1.00% 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 0.80 - 1.10% 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% 0.20 - 0.30% 2.00 - 3.00%

ASTM A320 Recomended Nuts and Washer

Grade Nuts Washers
L7 A194 Grade 4 or 7 F436
L43 A194 Grade 4 or 7 F436
B8 Class 1 A194 Grade 8 SS304
B8M Class 1 A194 Grade 8M SS316
B8 Class 2 A194 Grade 8 SS304
B8M Class 2 A194 Grade 8M SS316
Strain hardened nuts available as a supplementary requirement

Standard Specification ASTM A320 Stud Bolts

ASTM A320 Stud Bolts Size Range 3/8" to 4" Diameter (Imperial & Standard) .
ASTM A320 Stud Bolts Types All Thread, Double End, Single End
ASTM A320 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 Stud Bolts Specification ASTM A320 / ASME SA320
ASTM A320 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 Stud Bolts Surface Coating
  • PTFE Coating : Flouropolymer, 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 Stud Bolts Packaging Cartoon Box / Wooden Pallet / Wooden Box / Thread Protector

    ASTM A320 Stud Bolts Application

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

    Export Destinations For Stud Bolts

    we are supplier of ASTM A320 Stud Bolts to Mexico, Angola, Bulgaria, Italy, Gambia, Afghanistan, Trinidad & Tobago, Macau, Hungary, India, Mongolia, Brazil, Denmark, Greece, Tunisia, Tibet, New Zealand, Ghana, Belarus, Thailand, Portugal, Finland, Chile, Estonia, United States, Zimbabwe, Ireland, Austria, Kuwait, Slovakia, Malaysia, South Africa, Indonesia, Bahrain, Iraq, Belgium, Azerbaijan, Romania, Croatia, Czech Republic, Nigeria, Bhutan, Bolivia, Spain, Switzerland, Namibia, Netherlands, Australia, Yemen, Peru, Kenya, Taiwan, Saudi Arabia, Morocco, Colombia, Oman, United Kingdom, Norway, Chile, Israel, Costa Rica, Lithuania, Philippines, Iran, Ecuador, South Korea, Kazakhstan, China, Egypt, Russia, Sweden, Venezuela, Jordan, Libya, Hong Kong, Japan, Gabon, Serbia, Algeria, Lebanon, Qatar, Singapore, Vietnam, Sri Lanka, France, Nepal, Ukraine, Argentina, Canada, Poland, Germany, United Arab Emirates, Turkey, Puerto Rico, Nigeria, Bangladesh

    Cities we Deliver Stud Bolts

    We are Suppliers of ASTM A320 Stud Bolts to Kanpur, Faridabad, Navi Mumbai, Caracas, Visakhapatnam, Moscow, Algiers, Jakarta, Haryana, Noida, Mumbai, Seoul, Surat, Coimbatore, Jamshedpur, Singapore, Kolkata, Pimpri-Chinchwad, Mexico City, Manama, Los Angeles, Istanbul, Ahmedabad, Bangkok, Madrid, Petaling Jaya, Muscat, Ludhiana, Riyadh, Ankara, Dallas, Chennai, New York, Port-of-Spain, Thane, Kuala Lumpur, Santiago, Colombo, Vadodara, Abu Dhabi, Baroda, Indore, London, Vung Tau, Granada, Nashik, Edmonton, Ernakulam, Hyderabad, Gurgaon, Kuwait City, New Delhi, Lahore, Bogota, Al Jubail, Sydney, Pune, Perth, Houston, Courbevoie, Rajkot, Ho Chi Minh City, Cairo, Toronto, Ahvaz, Howrah, La Victoria, Al Khobar, Gimhae-si, Sharjah, Thiruvananthapuram, Dubai, Tehran, Busan, Rio de Janeiro, Jaipur, Ulsan, Bengaluru, Dammam, Chandigarh, Geoje-si, Karachi, Jeddah, Secunderabad, Calgary, Brisbane, Nagpur, Lagos, Melbourne, Atyrau, Ranchi, Hong Kong, Bhopal, Hanoi, Milan, Chiyoda, Montreal, Doha, Aberdeen

    For a Standard or Special Fastener, we are at your service! We specialize in Xylan Coated Stud Bolts, those made from Stainless Steel and Non-Ferrous Alloys. Look to Savoy Piping Inc. for fine Products and Reliable Information. Contact us today for All your Fasteners Need

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