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ASTM A320 L7 Stud Bolts

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  • ASTM A320 L7 Stud Bolts

SA 320 gr L7 Hex Bolt & ASTM A320 Bolts and Nuts manufacturer in India

L7m bolts & nuts belong to the ASTM A320 specification which covers bolt, nuts, studs and other fasteners that are used at high temperature applications. There are classes A, B, C and D in this specification that are used in different application types. Rolex Metal Distributors is a leading manufacturer and supplier of the different types of ASTM A320 gr l7 Studs and the L7M types. Both are similar in the chemical composition but have differences in the mechanical properties. The grade L7M has higher hardness values than the L7 bolts. The ASTM A320 Grade L7 Material has carbon, manganese, phosphorus, sulfur, silicon, 24% nickel, 13% chromium, molybdenum, titanium, aluminum, vanadium and boron in the composition. This composition allows the bolts to have excellent mechanical and corrosion resistance properties. The class D has 895MPa minimum tensile strength and 725MPa minimum yield strength while the classes A, B and C have only up to 585MPa minimum yield strength.

The elongation for all grades of ASTM A320 L7 Stud Bolts are 15%. The material also has very good hardness values. The class D has Brinell Hardness Number ranging from 248 to 321 where the other grades have from 248 to 341. The strength, corrosion resistance and the temperature resistance makes the bolts applicable in various applications. The A320 Gr L7 Hdg is quenched and tempered to get the maximum hardness for the bolts. Due to the high nickel and chromium content along with titanium and vanadium, the material is resistant to acidic corrosion as well. So the uses of these bolts can be seen in the chemical industries often. The bolts are also used in other industries with greater success. The A320 Gr L7 Stud is also used in oil and gas, petrochemical, pharmaceutical, food production and in marine engineering applications where extreme hardness, wear resistance and corrosion resistance are needed. Please contact us for your orders on the ASTM A320 L7 bolts and nuts and the pricing.

ASTM A320 L7 Stud Bolts

ASTM A320 L7 Stud Bolts

A320 L7 Threaded Rod and Studs

A320 L7 Threaded Rod and Studs

ASTM A320 Grade L7 Alloy Steel Hex Bolt

ASTM A320 Grade L7 Alloy Steel Hex Bolt

A320 Grade L7 Stud Bolt

A320 Grade L7 Stud Bolt

Grade L7 Alloy Steel Nuts

Grade L7 Alloy Steel Nuts

ASTM A320 L7 Fasteners

ASTM A320 L7 Fasteners

Manufacturer of A320 Gr L7 Material for for pressure vessels, Check SA 320 gr L7 Threaded Rod price list ex Mumbai

ASTM A320 L7 Stud Bolts
Types of ASTM A320 L7 Stud Bolts

Table of contents

ASTM A320 L7 Stud Bolts Price List India

Don't forget to compare our price with other ASTM A320 L7 Carbon Steel Fasteners manufacturers, Buy Grade L7 Square Head Bolts & SA 320 L7 Eye Bolts at genuine price in India

Material Size Price in India
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 5/8 X 4.5 INR 316/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 7/8 X 5.5 INR 304/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 7/8 X 5.75 INR 295/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 1/2 X 3.25 INR 345/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 1-3/8 X 9.25 INR 300/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 1-1/8 X 8.25 INR 290/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 1-1/8 X 7.5 INR 299/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 7/8 X 6.25 INR 302/Kg
STUD BOLT ASTM A320-L7 with 2 HEAVY HEX NUT 1 X 6.25 INR 305/Kg

Call us or send us an email to marketing@rolexmetals.com for more price ex Mumbai, India.

ASTM A320 L7 Fasteners Specifications
ASTM A320 L7 Bolts ANSI B18.2.1, DIN 931/ 933, ASTM A320 Grade L7M, L7, B8, B8M
Alloy Steel ASTM A320 gr L7 Hex Bolts Size Metric
  • Dia: M10 - M110
  • Length: 12 - 1200MM
A320 L7 Hex Bolts Size Inch
  • Dia: 1/2" - 4.0"
  • Length: 1/2" - 52"
ASTM A320 Grade L7 Alloy Steel Eye Bolts Metric Size
  • Dia: M10 - M48
A320 Grade L7 Stud Bolt Metric Size
  • Dia: M10 - M110
  • Length: 12 mm - 6000 mm
Grade L7 Alloy Steel Stud Bolt Inch
  • Dia: 1/2" - 4.1/2"
  • Length: 1/2" - 236"
ASTM A320 L7 Carbon Steel Hex Nut (DIA)
  • Metric: M6 - M110
  • Inch: 1/4" - 4.5"
ASME SA320 L7 Plain Washer (DIA)
  • Metric: M6 - M110
  • Inch: 1/2" - 4.1/2"
ASTM A320 L7 Stud Bolts International Standard IS, ANSI, ASTM DIN, ISO, JIS, GB, ASME, BS, UNI
AISI 4140 A320 L7 Bolts Standard Sizes M10, M4, M16, M36 M2.5, M6, M30, M12, M8, M14, M2, M3, M20, M24, M5 to M160
ASTM A320 Grade L7 Fasteners Threads BSF, UNF METRIC, UNC, UNEF, BSW or as required
ASME/ ANSI - American Standard ASTM A320 L7 Stud Bolts
  • ANSI B 28.2.4 1M
  • ANSI B 18.2.4 2M
  • ASME B18.5
  • ASME B18.2.2
DIN German Standard ASTM A320 L7 Stud Bolts DIN 933, DIN 931, DIN 970, DIN 934
ISO Standard SA 320 L7 Bolts ISO 4033, : ISO 4032, JIS standards
ASTM A320 Gr L7 Bolts / Screws Head Drive Phillips, Slotted, Phillips/Slot, Six-Lobe
MTC (Manufacturer Test Certificate) EN 10204 / 3.1, Merkblatt AD 2000 W2 and PED 97/23/EC Certified, NACE MR0175 / MR0103 /ISO 15156 Compliance
SA 320 Gr L7 Nut Bolt Finishing 
  • Zinc white, (yellow, black, blue), black oxide,
  • Dacroment, Geometry, plated zinc-nickel, anodizing, nickel plated,
  • Stainless steel: Passivated Self-Colour, Bright Zinc Plated (BZP),
  • Hot Dip Galvanised (HDG), Sherardized, DACROMET and Mechanically Applied coating
ASME SA320 Grade L7 Fasteners Production Process
  • M2-M24: Cold Forging, hot forging
  • M24-M100, machining and CNC for Customized connecting element
ASTM A320 L7 Stud Bolts Coating
  • Xylon Coated Fasteners
  • Phosphate Coated Fasteners
  • Hot Dipped Galvanizing Coated Fasteners
  • Teflon Coated Fasteners
  • Zinc Coated Fasteners
  • Cadmium Coated Fasteners
  • Ptfe Coated Fasteners (Teflon)
SA 320 Grade L7 Fasteners Packing Wooden Pallet, Canton, Carton / Small Box or as required

Relevant Material Grades

ASTM Grade Description
ASTM A320 L7 AISI 4140/4142 Quenched and tempered
ASTM A320 L7M AISI 4145 Quenched and tempered
ASTM A320 L43 AISI 4340 Quenched and tempered
ASTM A193 B8 Class 1 AISI/ SS 304, carbide solution treated
ASTM A193 B8 Class 2 AISI/ SS 304, carbide solution treated, strain hardened
ASTM A193 B8M Class 1 AISI / SS 316, carbide solution treated
ASTM A193 B8M Class 2 AISI/ SS 316, carbide solution treated, strain hardened
Types of Alloy Steel ASTM A320 gr L7 Bolts

Exporter & supplier of large size ASTM A320 Grade L7 Heavy Hex Bolts & A320 L7 Studs at low cost

ASTM A320 L7 Flange Bolts

ASTM A320 L7 Flange Bolts

Alloy Steel ASTM A320 gr L7 Heavy Hex Bolts

Alloy Steel ASTM A320 gr L7 Heavy Hex Bolts

A320 L7 Hex Bolts

A320 L7 Hex Bolts

ASTM A320 Grade L7 Alloy Steel Eye Bolts

ASTM A320 Grade L7 Alloy Steel Eye Bolts

A320 Grade L7 Lag Bolts

A320 Grade L7 Lag Bolts

Grade L7 Alloy Steel Square Bolts

Grade L7 Alloy Steel Square Bolts

ASTM A320 L7 Carbon Steel U Bolts

ASTM A320 L7 Carbon Steel U Bolts

ASME SA320 L7 Anchor Bolts

ASME SA320 L7 Anchor Bolts

AISI 4140 A320 L7 Hex Head Bolts

AISI 4140 A320 L7 Hex Head Bolts

ASTM A320 Grade L7 Carriage Bolts

ASTM A320 Grade L7 Carriage Bolts

SA 320 L7 Allen Cap Bolt

SA 320 L7 Allen Cap Bolt

ASTM A320 Gr L7 Countersunk Bolts

ASTM A320 Gr L7 Countersunk Bolts

A320 L7 Nuts Types
ASTM A320 L7 Hex Nuts

ASTM A320 L7 Hex Nuts

Alloy Steel ASTM A320 gr L7 Heavy Hex Nuts

Alloy Steel ASTM A320 gr L7 Heavy Hex Nuts

A320 L7 Castle Nuts

A320 L7 Castle Nuts

ASTM A320 Grade L7 Alloy Steel Hex Jam Nuts

ASTM A320 Grade L7 Alloy Steel Hex Jam Nuts

A320 Grade L7 Heavy Jam Nuts

A320 Grade L7 Heavy Jam Nuts

Grade L7 Alloy Steel Hex Coupling Nuts

Grade L7 Alloy Steel Hex Coupling Nuts

ASTM A320 L7 Carbon Steel Sleeve Nuts

ASTM A320 L7 Carbon Steel Sleeve Nuts

ASME SA320 L7 Lock Nuts

ASME SA320 L7 Lock Nuts

AISI 4140 A320 L7 Rivet Nuts

AISI 4140 A320 L7 Rivet Nuts

ASTM A320 Grade L7 Lug Nuts

ASTM A320 Grade L7 Lug Nuts

SA 320 L7 Tee Nut

SA 320 L7 Tee Nut

ASTM A320 Gr L7 Nylon Insert Hex Lock Nuts

ASTM A320 Gr L7 Nylon Insert Hex Lock Nuts

ASTM A320 Grade L7 Alloy Steel Screws Types
SA 320 Gr L7 Self Drilling Screws

SA 320 Gr L7 Self Drilling Screws

ASME SA320 Grade L7 Self Tapping Screws

ASME SA320 Grade L7 Self Tapping Screws

SA 320 Grade L7 Set Screws

SA 320 Grade L7 Set Screws

ASME SA320 Gr L7 Socket Head Cap Screw

ASME SA320 Gr L7 Socket Head Cap Screw

ASTM A320 L7 Dowel Screw

ASTM A320 L7 Dowel Screw

Alloy Steel ASTM A320 gr L7 Countersunk Screws

Alloy Steel ASTM A320 gr L7 Countersunk Screws

A320 L7 Socket Set Screw

A320 L7 Socket Set Screw

ASTM A320 Grade L7 Alloy Steel Wood Screw

ASTM A320 Grade L7 Alloy Steel Wood Screw

Types of A320 Grade L7 Threaded Rod and Studs

Buy ASTM A320 gr L7 Anchor Bolts, A320 Grade L7 Screws & A320 Gr L7 J Bolts in custom sizes and threads

ASTM A320 L7 Stud Bolts

ASTM A320 L7 Stud Bolts

Alloy Steel ASTM A320 gr L7 Double Ended Studs

Alloy Steel ASTM A320 gr L7 Double Ended Studs

ASTM A320 Grade L7 Alloy Steel Fully Threaded Studs

ASTM A320 Grade L7 Alloy Steel Fully Threaded Studs

A320 Grade L7 Threaded Rod

A320 Grade L7 Threaded Rod

Grade L7 Alloy Steel Unc Stud Bolt

Grade L7 Alloy Steel Unc Stud Bolt

Different types of Grade L7 Alloy Steel Washers
ASTM A320 L7 Flat Washers

ASTM A320 L7 Flat Washers

Alloy Steel ASTM A320 gr L7 Lock Washer

Alloy Steel ASTM A320 gr L7 Lock Washer

A320 L7 Spring Washer

A320 L7 Spring Washer

ASTM A320 Grade L7 Alloy Steel Washers

ASTM A320 Grade L7 Alloy Steel Washers

A320 Grade L7 Split Washers

A320 Grade L7 Split Washers

Grade L7 Alloy Steel Dock Washers

Grade L7 Alloy Steel Dock Washers

ASTM A320 L7 Carbon Steel Star Washers

ASTM A320 L7 Carbon Steel Star Washers

ASME SA320 L7 Belleville Washers

ASME SA320 L7 Belleville Washers

AISI 4140 A320 L7 Fender Washer

AISI 4140 A320 L7 Fender Washer

ASTM A320 Grade L7 Square Washers

ASTM A320 Grade L7 Square Washers

SA 320 L7 Spherical Washer

SA 320 L7 Spherical Washer

ASTM A320 L7 Carbon Steel Hex Bolt Dimensions Table

ASTM A320 L7 Carbon Steel Hex Bolt Dimensions Table

Hexagon Head Bolt with Nut DIN555 DIN601, Grade L7 Alloy Steel, Metric Coarse

D k nom k Max Min s max s min e nom e Max Min shank Max shank Min washer Max washer Min
M1.6 1.1000 1.2250 0.9750 3.2000 3.0800 3.4100 3.7000 3.4800 1.6000 1.4600 - -
M2 1.4000 1.5250 1.2750 4.0000 3.8800 4.3200 4.6000 4.3800 2.0000 1.8600 - -
M2.5 1.7000 1.8250 1.5750 5.0000 4.8800 5.4500 5.8000 5.5100 2.5000 2.2300 - -
M3 2.0000 2.1250 1.8750 5.5000 5.3800 6.0100 6.4000 6.0800 3.0000 2.8600 5.0800 4.8300
M3.5 2.4000     6.0000   6.5800            
M4 2.8000 2.9250 2.6750 7.0000 6.8500 7.6600 8.1000 7.7400 4.0000 3.8200 6.5500 6.3000
M5 3.5000 3.6500 3.3500 8.0000 7.8500 8.7900 9.2000 8.8700 5.0000 4.8200 7.5500 7.3000
M6 4.0000 4.1500 3.8500 10.0000 9.7800 11.0500 11.5000 11.0500 6.0000 5.8200 9.4800 9.2300
M7 4.8000     11.0000   12.1200            
M8 5.3000 5.6500 5.3500 13.0000 12.7300 14.3800 15.0000 14.3800 8.0000 7.7800 12.4300 12.1800
M10 6.4000 7.1800 6.8200 17.0000 16.7300 18.9000 19.6000 18.9000 10.0000 9.7800 16.4300 16.1800
M12 7.5000 8.1800 7.8200 19.0000 18.6700 21.1000 21.9000 21.1000 12.0000 11.7300 18.3700 18.1200
M14 8.8000 9.1800 8.8200 22.0000 21.6700 24.4900 25.4000 24.4900 14.0000 13.7300 21.3700 21.1200
M16 10.0000 10.1800 9.8200 24.0000 23.6700 26.7500 27.7000 26.7500 16.0000 15.7300 23.2700 23.0200
M18 11.5000 12.2150 11.7850 27.0000 26.6700 30.1400 31.2000 30.1400 18.0000 17.7300 26.2700 26.0200
M20 12.5000 13.2150 12.7850 30.0000 29.6700 33.5300 34.6000 33.5300 20.0000 19.6700 29.2700 28.8000
M22 14.0000 14.2150 13.7850 32.0000 31.6100 35.7200 36.9000 35.7200 22.0000 21.6700 31.2100 30.7400
M24 15.0000 15.2150 14.7850 36.0000 35.3800 39.9800 41.6000 39.9800 24.0000 23.6700 34.9800 34.5100
M27 17.0000 17.2150 16.7850 41.0000 40.3800 45.2000 47.3000 45.6300 27.0000 26.6700 39.9800 39.3600
M30 18.7000 19.2600 18.7400 46.0000 45.3800 50.8500 53.1000 51.2800 30.0000 29.6700 44.9800 44.3600
M33 21.0000 21.2600 20.7400 50.0000 49.3800 55.3700 57.7000 55.8000 33.0000 32.6100 48.9800 48.3600
M36 22.5000 23.2600 22.7400 55.0000 54.2600 60.7900 63.5000 61.3100 36.0000 35.6100 53.8600 53.2400
M39 25.0000 25.2600 24.7400 60.0000 59.2600 66.4000 69.3000 66.9600 39.0000 38.6100 58.8600 58.2400
M42 26.0000 26.2600 25.7400 65.0000 64.2600 71.3000 75.1000 72.6100 42.0000 41.6100 63.7600 63.0400
M45 28.0000 28.2600 27.7400 70.0000 69.2600 76.9500 80.8000 78.2600 45.0000 44.6100 68.7600 68.0400
M48 30.0000 30.2600 29.7400 75.0000 74.2600 82.6000 86.6000 83.9100 48.0000 47.6100 73.7600 73.0400
M52 33.0000 33.2100 32.6900 80.0000 79.2600 88.3000 92.4000 89.5600 52.0000 51.5400 - -
M56 35.0000 35.3100 34.6900 85.0000 84.1300 93.6300 98.1000 95.0700 56.0000 55.5400 - -
M60 38.0000 38.3100 37.6900 90.0000 89.1300 99.3500 103.9000 100.7200 60.0000 59.5400 - -
M64 40.0000 40.3100 39.6900 95.0000 94.1300 104.9800 109.7000 106.3700 64.0000 63.5400 - -
M68 43.0000 43.3100 42.6900 100.0000 99.1300 110.5000 115.5000 112.0200 68.0000 67.5400 - -
M72 45.0000     105.0000 102.8000 116.0300       71.2600    
M76 48.0000     110.0000 107.8000 121.5500       75.2600    
M80 50.0000     115.0000   127.3000       79.2600    
M90 57.0000     130.0000   144.0000       89.1300    
M100 63.0000     145.0000   161.0000       99.1300    
M110 69.0000     155.0000   171.2800       109.1300    
M125 79.0000     180.0000   198.9000       124.0000    
M140 88.0000     200.0000   221.0000       139.0000    
M160 100.0000     230.0000   254.1500       159.0000    
ASME SA320 L7 Double End Stud Metric Dimensions

ASME SA320 L7 Double End Stud Metric Dimensions

DIN940 Stud End =2.1/2 D Sk6, A320 Grade L7, Metric Coarse

d b c l<125 c l<125<200 c l 200>
M3 7.5000 12.0000 18.0000  
M4 10.0000 14.0000 20.0000  
M5 12.5000 16.0000 22.0000  
M6 15.0000 18.0000 24.0000 37.0000
M7 17.5000 20.0000 26.0000 39.0000
M8 20.0000 22.0000 28.0000 41.0000
M10 25.0000 26.0000 32.0000 45.0000
M12 30.0000 30.0000 36.0000 49.0000
M14 35.0000 34.0000 40.0000 53.0000
M16 40.0000 38.0000 44.0000 57.0000
M18 45.0000 42.0000 48.0000 61.0000
M20 50.0000 46.0000 52.0000 65.0000
M22 55.0000 50.0000 56.0000 69.0000
M24 60.0000 54.0000 60.0000 73.0000
M27 67.5000 60.0000 66.0000 79.0000
M30 75.0000 66.0000 72.0000 85.0000
M33 82.5000 72.0000 78.0000 91.0000
M36 90.0000 78.0000 84.0000 97.0000
AISI 4140 A320 L7 Hex Nut Dimensions & Weight

AISI 4140 A320 L7 Hex Nut Dimensions & Weight

Hexagon Full Nut ASTM A320 Grade L7 Alloy Steel DIN934, Metric Coarse

d s e m
M1.2 3.0000 3.2900 1.0000
M1.4 3.0000 3.2900 1.2000
M1.6 3.2000 3.4800 1.3000
M1.7 3.5000 3.8200 1.4000
M2 4.0000 4.3200 1.6000
M2.3 4.5000 4.9500 1.8000
M2.5 5.0000 5.4500 2.0000
M2.6 5.0000 5.5100 2.0000
M3 5.5000 6.0100 2.4000
M3.5 6.0000 6.0100 2.8000
M4 7.0000 7.6600 3.2000
M5 8.0000 8.7600 4.0000
M6 10.0000 11.0500 5.0000
M7 11.0000 12.1200 5.5000
M8 13.0000 14.3800 6.5000
M10 17.0000 18.9000 8.0000
M12 19.0000 21.1000 10.0000
M14 22.0000 24.4900 11.0000
M16 24.0000 26.7500 13.0000
M18 27.0000 29.5600 15.0000
M20 30.0000 32.9500 16.0000
M22 32.0000 35.0300 18.0000
M24 36.0000 39.5500 19.0000
M27 41.0000 45.2000 22.0000
M30 46.0000 50.8500 24.0000
M33 50.0000 55.3700 26.0000
M36 55.0000 60.7900 29.0000
M39 60.0000 66.4400 31.0000
M42 65.0000 71.3000 34.0000
M45 70.0000 76.9500 36.0000
M48 75.0000 82.6000 38.0000
M52 80.0000 88.2500 42.0000
M56 85.0000 95.0700 45.0000
M60 90.0000 100.7200 48.0000
M64 95.0000 106.3700 51.0000
M68 100.0000 112.0200 54.0000
M72 105.0000 117.6700 58.0000
M76 110.0000 123.3200 61.0000
M80 115.0000 128.9700 64.0000
M85 120.0000 133.1100 68.0000
M90 130.0000 145.7700 72.0000
M95 135.0000 151.4200 76.0000
M100 145.0000 162.7200 80.0000
M110 155.0000 174.0200 88.0000
M115 165.0000 185.3200 92.0000
M120 170.0000 190.9700 96.0000
M125 180.0000 202.2700 100.0000
M130 185.0000 207.7500 104.0000
M135 190.0000 213.4000 108.0000
M140 200.0000 224.7000 112.0000
M145 210.0000 236.0000 116.0000
M150 210.0000 236.0000 120.0000
ASTM A320 Grade L7 Flat Washer Weight & Dimensions

ASTM A320 Grade L7 Flat Washer Weight & Dimensions

Metric Type A Flat Washer ASTM A320 L7 Carbon Steel DIN 125A

D  d1  d2  h 
M1 1.1000 3.0000 0.3000
M1.2 1.3000 3.5000 0.3000
M1.4 1.5000 4.0000 0.3000
M1.6 1.7000 4.0000 0.3000
M1.7 1.8000 4.5000 0.3000
M2 2.2000 5.0000 0.3000
M2.3 2.5000 6.0000 0.5000
M2.5 2.7000 6.0000 0.5000
M2.6 2.8000 7.0000 0.5000
M3 3.2000 7.0000 0.5000
M3.5 3.7000 8.0000 0.5000
M4 4.3000 9.0000 0.8000
M5 5.3000 10.0000 1.0000
M6 6.4000 12.0000 1.6000
M7 7.4000 14.0000 1.6000
M8 8.4000 16.0000 1.6000
M10 10.5000 20.0000 2.0000
M12 13.0000 24.0000 2.5000
M14 15.0000 28.0000 2.5000
M16 17.0000 30.0000 3.0000
M18 19.0000 34.0000 3.0000
M20 21.0000 37.0000 3.0000
M22 23.0000 39.0000 3.0000
M24 25.0000 44.0000 4.0000
M27 28.0000 50.0000 4.0000
M30 31.0000 56.0000 4.0000
M33 34.0000 60.0000 5.0000
M36 37.0000 6.0000 5.0000
M39 40.0000 72.0000 6.0000
M42 43.0000 78.0000 7.0000
M45 46.0000 85.0000 7.0000
M48 50.0000 92.0000 8.0000
M52 54.0000 98.0000 8.0000
M55 57.0000 105.0000 9.0000
M56 58.0000 105.0000 9.0000
M58 60.0000 110.0000 9.0000
M60 62.0000 110.0000 9.0000
M64 66.0000 115.0000 9.0000
M68 70.0000 120.0000 10.0000
M72 74.0000 125.0000 10.0000
M76 78.0000 135.0000 10.0000
M80 82.0000 140.0000 12.0000
M85 87.0000 145.0000 12.0000
M90 93.0000 160.0000 12.0000
M95 98.0000 165.0000 12.0000
M100 104.0000 175.0000 14.0000
M105 109.0000 180.0000 14.0000
M110 114.0000 185.0000 14.0000
M115 119.0000 200.0000 14.0000
M120 124.0000 210.0000 16.0000
M125 129.0000 220.0000 16.0000
M130 134.0000 230.0000 16.0000
M135 139.0000 230.0000 16.0000
M140 144.0000 240.0000 18.0000
M145 149.0000 250.0000 18.0000
M150 155.0000 250.0000 18.0000
M160 165.0000 250.0000 18.0000
ASTM A320 L7 Stud Bolts Torque Chart

ASTM A320 Grade L7 Stud Bolts Torque FT-LBS- Cold Service (Not for PTFE Coated Stud Bolts and nuts)

BOLT
SIZE		 Torque FT-LBS
30% Initial
Torque		 70%
Torque		 100% Final
Torque
1/2 23 54 76
9/16 33 77 110
5/8 46 107 152
3/4 81 189 270
7/8 131 305 436
1 196 457 653
1.1/8 287 671 958
1¼ 404 943 1348
1.3/8 854 1279 1828
1½ 725 1689 2413
1.9/16 824 1922 2746
1.5/8 935 2183 3118
1¾ 1177 2747 3924
1.7/8 1461 3410 4871
2 1792 4180 5972
2¼ 2590 6044 8635
2½ 3590 8376 11966

ASTM A320 Grade L7 Stud Bolts Torque Nm- Cold Service (Not for PTFE Coated Stud Bolts and nuts)

BOLT
SIZE		 Torque Nm
30% Initial
Torque		 70%
Torque		 100% Final
Torque
1/2 31 73 103
9/16 45 104 149
5/8 62 145 206
3/4 110 256 366
7/8 178 414 591
1 266 620 885
1.1/8 389 910 1299
1¼ 548 1279 1828
1.3/8 1158 1734 2478
1½ 983 2290 3272
1.9/16 1117 2606 3723
1.5/8 1268 2960 4227
1¾ 1596 3724 5320
1.7/8 1981 4623 6604
2 2430 5667 8097
2¼ 3512 8195 11707
2½ 4867 11356 16224

ASTM A320 L7 PTFE Coated Stud Bolts and nuts Torque FT-LBS (Cold Service)

BOLT
SIZE		 Torque FT-LBS
30% Initial
Torque		 70%
Torque		 100% Final
Torque
1/2 17 40 57
9/16 25 58 83
5/8 34 80 114
3/4 61 142 203
7/8 98 229 327
1 147 343 490
1.1/8 216 503 719
1¼ 303 707 1011
1.3/8 411 959 1371
1½ 543 1267 1809
1.9/16 618 1441 2059
1.5/8 702 1637 2339
1¾ 883 2060 2943
1.7/8 1096 2557 3653
2 1344 3135 4479
2¼ 1943 4533 6476
2½ 2692 6282 8974

SA 320 Grade L7 PTFE Coated Stud Bolts and nuts Torque Nm (Cold Service)

BOLT
SIZE		 Torque Nm
30% Initial
Torque		 70%
Torque		 100% Final
Torque
1/2 23 54 77
9/16 34 79 113
5/8 46 108 155
3/4 83 193 275
7/8 133 310 443
1 199 465 664
1.1/8 293 682 975
1¼ 411 959 1371
1.3/8 557 1300 1859
1½ 736 1718 2453
1.9/16 838 1954 2792
1.5/8 952 2219 3171
1¾ 1197 2793 3990
1.7/8 1486 3467 4953
2 1822 4250 6073
2¼ 2634 6146 8780
2½ 3650 8517 12167
SA 320 L7 Fasteners Chemical Composition
Element L7 (AISI 4140) L43 (AISI 4340) B8 (AISI 304) B8M (AISI 316)
Carbon (C) 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 (Ni) 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 Gr L7 Bolts Mechanical Properties
Stud Bolts Tensile Class Stud Bolts Tensile Stress, min Stud Bolts Yield strength, 0.2% offset, min Elongation in 4D min, % Reduction of Area, min, %
ksi MPa ksi MPa
A, B and C 130 895 85 585 15 18
D 130 895 105 725 15 18

ASTM A320 L7 Stud Bolts & Nuts Hardness

Grade Class Brinell Hardness No. Approx Rockwell Hardness B & C
minimum maximum
A, B and C 248 - 341 24 HRC 27 HRC
D 248 - 321 24 HRC 35 HRC

ASTM A320 Grade L7 Tensile Class
Class A Class B Class C Class D

ASTM A320 Gr L7 Stud Bolts & Nuts Stress Rupture Requirements

Class Test Temperature °F [°C] Stress, minimum Time to Rupture, min, h [Note] Elongation, min, %
ksi Mpa
A, B and C 1200 [650] 56 385 100 5
D 1200 [650] 40 275 100 5
SA 320 Gr L7 Nut Bolt Equivalent Grade
  • Alloy Steel
  • AISI 4140
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