ASTM A320 Grade L7 Bolts

Manufacturer, Supplier and Exporter of A320 Bolts, A320 B8 Bolts, A320 B8m Bolt, ASTM A320 L7 Lag Bolt

Manufacturer of ASTM A320 AISI 4140 Bolts, SA320 4140 Hex Bolts, AISI 4142 Gr. L7 Stud Bolts, A320 L7 Anchor Bolt, ASTM A320 L7 Flange Bolt in India

Stud Bolts, ASTM A320 / SA320 Grade L7, Grade 7 Heavy Hex Nut, Plain, Assembly

ASTM A320 L7 specification covers alloy steel bolting materials such as rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts for pressure vessels, valves, flanges, and fittings for low-temperature service. Each alloy shall conform to the prescribed chemical composition requirements. ASTM A320 material, as represented by the tension specimens, shall conform to the requirements as to tensile properties such as tensile strength, yield strength, elongation, and hardness. SA320 material shall meet the prescribed impact energy absorption requirements and the recommended test temperature. Mechanical tests shall be conducted on the material, namely: impact testing, tension testing, and hardness testing.

ASTM A320 L7 Bolts

ASTM A320 L7 bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. ASTM A320 L7 Hex Bolts and ASTM A320 L7 Hex Head Bolts is some of the toughest fasteners. These ASME SA320 L7 sturdy fasteners are used to connect heavy materials.

Steel Tubes India is a leading manufacturer & stockist of ASTM A320 L7 Long Bolts and ASME SA320 L7 12 Point Bolts in India. Bolts are externally threaded fasteners used in industrial and construction applications for assembling two unthreaded products together and available in hundreds of combinations of materials, heads, threads, plating, heat treating, and secondary operations. We are manufacturer & supplier of ASTM A320 L7 studs such as All-Thread, Tap-End, Double-End Studs, and Combination Studs, different types of nuts such as Hex Nuts, Heavy Hex Nuts, Overtapped Nuts, Tommy Hole Nuts, Spherical-Faced Nuts and Full Threaded Rods, full thread rods, bonnet bolts, Carriage Bolt in a variety of finishes and sizes from 1/2" to 3 1/2". In the petroleum and chemical industry the fully threaded stud is the most common ASTM A320 L7 Bolt used for flanged connections. ASTM A320 L7 Stud bolts are available in all thread pitches (UNC/UNRC – UNF/UNRF – 8UN) diameters and metric sizes. Steel Tubes India has the capability to thread and manufacture specials from round bar to the customers drawings.

ASTM A320 L7 Hex Cap Screws- also known as machine bolts or hex bolts are available in various bolt grade markings and strengths. Our ASTM A320 L7 Nut Bolts Hex Bolts, Tab Bolts, Flange Bolts, Carriage Bolts, Shoulder Bolts and T Head Bolts are used to attach machine threaded fasteners when joining materials together.

Many of the ASTM A320 L7 Flange Bolts We produce for more critical high specification Superalloys in our Mumbai Factory. We also manufacture a wide range of the non-favoured thread forms such as BSW BSF UNC & UNF, we are finding the biggest call is now for Metric Hexagon Bolts that are modified versions of existing international standards or indeed custom bespoke bolting manufactured to Customer or OEM Drawings.

Is your requirement for a small ASTM A320 L7 fastener or large machined fastener? We will manufacture to your specifications and requirements. These Bolts can range in inch sizes from 1/4-20 through 1-8 (coarse thread) and 1/4-28 through 1-14 (fine thread). Bolts can range in metric sizes from M6-1.0 through M24-3 (coarse thread) and M6-0.75 through M24-1.5 (fine thread).

ASTM A320 L7 Specification

ASTM A320 L7 Bolt Type ASTM A320 L7 Anchor Bolt, Carriage Bolt, Flange Bolt, 12 Point Bolt, Hex and Hex Flange Bolts, Hex Head Cap Screw, Place Bolt, Socket Head Cap Screws, Hanger Bolt, Hexagon Bolt / Tap Bolt, Lag Bolt, Machine Bolt, Plow Bolt, Shoulder Bolt, Square Head Bolt, Stud Bolt, T-Head Bolt, Toggle Bolt, U-Bolt
Inch #0000 -3" (customized sizes available)
Metric M1.6 - M48
Length Customized Length
Grade Non Ferrous, 12.9, 10.9, 9.8, 8.8, 5.8, 4.6, B7, 2, 5, 8, L9
Material Brass, Bronze / Copper Base Alloy, Copper, Molybdenum, Steel, Hardened Steel, Stainless Steel, Superalloy (Inconel, 718 Bolts, Hastelloy, Monel), Titanium, Exotic Metals, Other
Method Cold forming, Hot Forging, Wire Forming
Fastener Standards ASME / ANSI, BS, DIN, ISO, JIS, SAE, Other
Application Industries & uses Agriculture, Automotive, Construction and Infrastructure, Energy, Transportation
Testing Methods ASTM E38, E76 and E354, ASTM E53, E54, E62, E75and E478, ASTM E34, E101 and E227, ASTM E 120 and E1409.
Threads Configuration ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Thread Diameters M6 to M36
Certification Dual Certified As per ASTM & ASME Codes

ASTM A320 B8cl2 Bolts

ASTM A320 B8 Class 2 Stainless steel AISI 304, carbide solution treated, strain hardened

ASTM A320 B8M Bolts

ASTM A320 B8M Class 1 Stainless steel AISI 316, carbide solution treated

ASTM A320 B8Mcl2 Bolts

ASTM A320 B8M Class 2 Stainless steel AISI 316, carbide solution treated, strain hardened

Grades

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

ASTM A320 Bolts Chemical Properties

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 0.04% 0.04% 0.05% 0.05%
Sulfur, max 0.04% 0.04% 0.03% 0.03%
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% 0.20 – 0.30% 2.00 – 3.00%

ASTM A320 Mechanical Properties

Grade Size Tensile, ksi min Yield, ksi, min Charpy Impact Elong, % min RA, %, min
L7 up to 21/2 125 105 -150° F 16 50
L43 sup a 4 125 105 -150° F 16 50
B8 Class 1 all 75 30 N/A 30 50
B8M Class 1 all 75 30 N/A 30 50
B8 Class 2 Up to 3/4 125 100 N/A 12 35
7/8 – 1 115 80 N/A 15 35
11/8 – 11/4 105 65 N/A 20 35
13/8 – 11/2 100 50 N/A 28 45
B8M Class 2 Up to 3/4 110 95 N/A 15 45
7/8 – 1 100 80 N/A 20 45
11/8 – 11/4 95 65 N/A 25 45
13/8 – 11/2 90 50 N/A

1. Scope

1.1 ASTM A320 specification covers alloy steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for low-temperature service. See Specification A962/A962M for the definition of bolting. The bars shall be hot-wrought and may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When strain hardened austenitic stainless steel is ordered, the purchaser should take special care to ensure that Appendix X1 is thoroughly understood.

1.2 Several grades are covered, including both ferritic and austenitic steels designated L7, B8, etc. Selection will depend on design, service conditions, mechanical properties, and low-temperature characteristics. The mechanical requirements of Table 1 indicate the diameters for which the minimum mechanical properties apply to the various grades and classes, and Table 2 stipulates the requirements for Charpy impact energy absorption. The manufacturer should determine that the material can conform to these requirements before parts are manufactured. For example, when Grade L43 is specified to meet the Table 2 impact energy values at −150 °F [−101 °C], additional restrictions (such as procuring a steel with lower P and S contents than might normally be supplied) in the chemical composition for AISI 4340 are likely to be required.

ASME SA320 L7 Bolts stockist in India- ASME, DIN, AS, BS

ASTM A320 L7 Bolts Coatings and plating as well as plain finished oil and tempered is available as required by the end user such as Zinc plating, Cadmium plating, Xylan ® coating, Dupont Teflon ® coating, Hot Dip Galvanized coating, Auge Antifrix ® coating, Sermagard ® coating and Niwat 1000 ® plating.

Manufacturer of ASTM A320 AISI 4140 12 Point Bolts, ASTM A320 Grade L7 AISI 4142 Bolts, ASTM A320 L7 Hexagon Head Cap Bolts in Mumbai, India.

ASTM A320 L7 Bolts supplier

Nominal Size

D (inch)
Major Diameter

Min.

Max.

1/4"

.2408

.2489

5/16"

.3026

.3113

3/8"

.3643

.3737

7/16"

.4258

.4361

1/2"

.4876

.4985

9/16"

.5459

.5609

5/8"

.6112

.6233

3/4"

.7353

.7482

7/8"

.8592

.8731

1"

.9830

.9980

1-1/8"

1.1079

1.1229

1-1/4"

1.2329

1.2479

1-3/8"

1.3578

1.3728

1-1/2"

1.4828

1.4978


EL

Effective Length

Tolerance

< 12 inch

+/- 0.062"

12 < 18 inch

+/- 0.125"

18 inch <

+/- 0.250"

Nut Specification Requirements:

Dimensions:

ASME B18.2.2 Heavy Hex

Thread Requirements:

ASME B1.1, 2B

-

UNC for all stud diameters 1” and smaller

-

UN8 for all stud diameters greater than 1”


Nut Material & Mechanical Properties:

Grade 7 of ASTM A194/A194M and ASME SA194/SA194M; Supplement S3

Nut Product Marking:

Per ASTM A194/A194M and ASME SA194/SA194M; Manufacturer ID and 7 for forged, or 7BL if machined from bar stock

Finish:

Light Protective Oil

Material Test Reports:

The MTR must have documented lot traceability, dimensional results, full chemical test results and full mechanical test results, to the ASTM A194/A194M and ASME SA94/SA194M specifications above, for the entire assembly

Grades

ASTM A320 L7 Alloy steel AISI 4140/4142 Quenched and tempered

ASTM A320 Grade L7 Chemical Properties

Element L7 (AISI 4140)
Carbon 0.37 – 0.49%
Manganese 0.65 – 1.10%
Phosphorus, max 0.04%
Sulfur, max 0.04%
Silicon 0.15 – 0.35%
Chromium 0.75 – 1.20%
Nickel
Molybdenum 0.15 – 0.25%

ASTM A320 Grade L7 Mechanical Properties

Grade Size Tensile, ksi min Yield, ksi, min Charpy Impact Elong, % min RA, %, min
L7 up to 21/2 125 105 -150° F 16 50
ASTM A320 Gr. L7 AISI 4142 Screws, ASTM A320 Gr. L7 Studs, A320 Grade L7 AISI 4142 Threaded Rod, AISI 4140 High Tensile Bolts Suppliers
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  • ASTM SA320 L7 Double End Studs manufacturers
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  • AISI 4142 Grade L7 Shoulder Bolts Manufacturer
  • ASTM A320 Grade L7 4140 Heavy Hex Nuts
  • ASTM A320 L7 AISI 4142 Draw Bolt Bolts

 

 

Available standard: DIN 934, ISO 4033, ISO 4032, DIN 935,DIN 936, ASME B18.2.2, ASME B18.2.4.6M, DIN 976, DIN 975, DIN 2510, DIN 939, DIN 940, DIN 938

PTFE coated bolts

Industries & Solutions

Contruction
Industrial
Shipbuilding
Nuclear

Pipe, Tube & Tubing

Sheet, Plate

Round Bar & fasteners


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