A193 / A193M

ASTM A193/A193M is a specification from the ASTM International that primarily govern industrial piping applications. In the assembly of an industrial plant, many complex components are bolted together of which include parts such as valves, piping, and pressure vessels. ASTM A193 defines the methodology to procure and certify externally threaded fasteners according to specific chemical and mechanical criteria. It is standards such as this that allow industrial process applications to be safely engineered so they do not exceed the tensile strength of the fasteners that hold them together.

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ASTM A193 Grade B7 Specification

ASTM A193 Grade B7 specification covers requirements for high tensile alloy steel bolting material for use in high temperature or high-pressure service and other special purpose applications. It is a standard specification defining typical chemical composition, mechanical properties, hardness requirement, preferential heat treatment, product marking, certification and other requirements, suitable for bolting used in pressure vessel service, valves, flanges and fittings. ASTM A193 defines both SI (Metric) and inch-pound units.

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC. Boltport uses Alloy Steel AISI 4140 bar stock or forging stock to produce B7 headed and non-headed bolts. A193 Grade B7 is the most commonly used Bolt specification coupled with A194 Grade 2H Nuts for Bolting Carbon Steel pipeline. A193 B7 bolting is available in metric sizes from M6 to M180 and imperial sizes from 1/4 to 7 inches, in diameter.

Find information on ASTM A193 Grade B7 chemical composition, mechanical properties such as tensile strength; yield strength, hardness, marking requirements and reference product standards.

Material grades that are governed under ASTM A193 include:

Ferritic steels

Grade: UNS designation[clarification needed]

B5 5% Chromium
B6 12% Chromium
B6X S 41000
B7 Chromium-molybdenum steel
B7M Chromium-molybdenum
B16 Chromium-molybdenum-vanadium steel
Austenitic steels
Grade: UNS designation

B8 S 30400 (304)
B8A S 30400 (304)
B8C S 34700 (347)
B8CA S 34700 (347)
B8M S 31600 (316)
B8MA S 31600 (316)
B8M2 S 31600 (316)
B83 S 31600 (316)
B8P S 30500
B8PA S 30500
B8N S 30451 (304N)
B8NA S 30451 (304N)
B8MN S 31651 (316N)
B8MNA S 31651 (316N)
B8MLCuN S 31254
B8MLCuNA S 31254
B8T S 32100 (321)
B8TA S 32100 (321)
B8R S 20910
B8RA S 20910
B8S S 21800
B8SA S 21800
B8LN S 30453
B8LNA S30453
B8MLN S 31653
B8MLNA S 31653

ASTM A193 Grade B7 Mechanical Properties – Metric Sizes

Diameter mm Min Tempering Temperature, °C Tensile Strength min, MPa Yield strength, min, 0.2% offset, MPa Elongation in 4D min, % Reduction of Area, min, % Hardness, max
M64 and Under 593 860 720 16 50 321 HBW or 35 HRC
over M64 to M100 593 795 655 16 50 321 HBW or 35 HRC
over M100 to M180 593 690 515 18 50 321 HBW or 35 HRC
ASTM A193 Grade B7 Mechanical Properties – Inch Sizes

Diameter Inch Min Tempering Temperature, °C Tensile Strength min, ksi Yield strength, min, 0.2% offset, ksi Elongation in 4D min, % Reduction of Area, min, % Hardness, max
2.5 and under 1100 125 105 16 50 321 HBW or 35 HRC
over 2.5 to 4 1100 115 95 16 50 321 HBW or 35 HRC
over 4 to 7 1100 100 75 18 50 321 HBW or 35 HRC
Astm A193 M12*1.75 M14*2 B7 Heavy Hex Bolt

3/4” Astm A193 M12*1.75 M14*2 B7 Heavy Hex Bolt

3/4” Astm A193 M12*1.75 M14*2 B7 Heavy Hex Bolt Material: carbon steel Color: black Standard: DIN GB ISO JIS BA ANSI Grade: B7 Finished: zinc plated/galvanized/black oxide/dacromet Thread: coarse, fine Used: building industry machinery Astm A193 M12*1.75 M14*2 B7 heavy hex bolt 1. Certification: ISO, ROHS, SGS 2. Available Standard: DIN, ANSI, ASTM, JIS, BSW […]

ASTM A193 B7 Heavy Hex Bolts

ASTM A193 B7 Heavy Hex Bolts

ASTM A193 B7 Heavy Hex Bolts Standard: ASME B 18.2.1, DIN931, Din933, ISO4014, DIN6914, A307, A325, A449, A490, A354 GrBD, A193 B7 Diameter: 3/8”~2”, M12-M50 (3/8”, 1/2”, 5/8”, 3/4”, 1”, 1 1/2”, 1 1/4”, 13/4”, 2”) Length: 5/8”~20”, 16mm-500mm Material:carbon steel 45#, alloy steel, 40CR, 35CRMO, 42CRMO, 4140, BY and so on. Grade: Grade 2 […]

Hing Strength Yellow Zinc Plated Hex Head Bolt

Hing Strength Yellow Zinc Plated Hex Head Bolt

Hing Strength Yellow Zinc Plated Hex head Bolt High strength bolt and nut Specification: According to customers’ requirements Service: OEM/ ODM Material: Stainless steel 303/304/316, Carbon Steel, Brass, Bronze, Aluminum, Titanium, Alloy, Stardard: GB, DIN, ISO, ANSI, ASME, IFI, JIS, BSW, HJ, BS, PEN category: Screw, bolt, nut, etc Surface Treatment: Bronze, Zinc plated, Rainbow, […]

ASTM A193 Heavy Hex Bolts

ASTM A193 Heavy Hex Bolts

Plain ASTM A193 heavy hex bolts and nuts Standard: ASME B 18.2.1, DIN931, Din933, ISO4014, DIN6914,A307, A325,A449, A490,A354 GrBD, A193 B7 Diameter: 3/8”~2” , M12-M50 (3/8”,1/2”,5/8”,3/4”, 1”, 1 1/2”,1 1/4”,13/4”,2”) Length: 5/8”~20”, 16mm-500mm Material: carbon steel 45#, alloy steel, 40CR, 35CRMO, 42CRMO, 4140, BY, Grade: Grade 2 / 5/ 8; CL4.8/CL8.8/ CL10.9/CL12.9; Finish: black oxide, […]

8.8 Heavy Hex Bolt And Nut Galvanized

8.8 Heavy Hex Bolt And Nut Galvanized

8.8 Heavy Hex Bolt And Nut Galvanized DIN 931 8.8 Grade Heavy Hex Bolt And Nut Galvanized Grade: 8.8/ 10.9/ 12.9 Ect Color: Oxidation blackening,Zinc plating, Surface treatment: HDG, PTFE coated, plain, black, galvanized, yellow zinc plated Packing: 25kg carton then pallet or according to the customer’s need Application: Machinery industry High strength bolts Length: […]

Full Threaded Grade 8.8s ASTM A325 A490 Bolts

Full Threaded Grade 8.8s ASTM A325 A490 Bolts

Full Threaded Grade 8.8s ASTM A325 A490 Bolts Heavy Hex Bolt Standard: ASME B 18.2.1,DIN6914 Size: 1/2”-1 1/2”,M12-M36 Material: Carbon Steel, Alloy Steel Grade: ASTM A325, A490,CL10.9 Thread: M, UNC, UNF Finish: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G. Packing: bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand Application: Structural […]

ASTM A193 B7 Heavy Hex Bolts and Nuts

ASTM A193 B7 Heavy Hex Bolts and Nuts

ASTM A193 B7 Heavy Hex Bolts and Nuts Standard: ASME B 18.2.1, DIN931, Din933, ISO4014, DIN6914,A307, A325,A449, A490,A354 GrBD, A193 B7 Diameter: 3/8”~2” , M12-M50 (3/8”,1/2”,5/8”,3/4”, 1”, 1 1/2”,1 1/4”,13/4”,2”) Length: 5/8”~20”, 16mm-500mm Material: carbon steel 45#, alloy steel, 40CR, 35CRMO, 42CRMO, 4140, BY Grade: Grade 2 / 5/ 8; CL4.8/CL8.8/ CL10.9/CL12.9; Finish: black oxide, […]

Carbon Steel Brass Heavy Hex Bolt

Fastener High Strength Yellow Black Carbon Steel Brass Heavy Hex Bolt

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A325 Heavy Hex Bolt And Nut

Hot Dip Zinc ASTM A325 Heavy Hex Bolt And Nut

A325 Heavy Hex Bolt And Nut Standard: ANSI Size: 5/8-11 X 1 1/4″, 5/8-11 X 2″, 5/8-11 X 8″ Material: Carbon Steel Grade: A307 Type B; A325 T/M; A490 Finish:Zinc Plated, Black oxide, H.D.G., Geomet Trade Term: FOB/ CIF/ CFR/ CNF/ EXW/ DDU/ DDP Application: Structural Steel Market: South & north America/ Europe/ East&South east […]

Heavy hex head structural bolt and nut

Heavy Hex Head Structural Bolt and Nut

Heavy hex head structural bolt and nut M12-M36 carbon steel HDG metric heavy hex head structural bolt and nut Standard: DIN933, DIN931, ISO4014, ISO4017, ANSI/ASME B18.2.1, DIN912, ANSI/ASME B18.3, ISO4762 Size: M12-M100,1/2″-4″ Material: Steel, 40Cr, 35CrMo, 42CrMo, 40CrNiMo, SCM435, 4150, 4140, 4130 Grade: 8.8,10.9,12.9,SAE Gr.5,Gr.8 Finish: Plain, Black, Zinc plated, Phosphated, H.D.G., Dacromet, Geomet Package: […]

ASTM Heavy Hex Bolt and Nut

ASTM Heavy Hex Bolt and Nut

ASTM Heavy Hex Bolt and Nut Material: stainless steel Color: Silvery Standard: DIN,ASME,ASNI,ISO Grade: B8 B8M B8t Finished: polish ,passivation Thread: Coarse,Fine Used: Building Industry Machinery Features of ASTM Heavy Hex Bolt and Nut: 1. Certification: ISO, ROHS, SGS 2. Available Standard: DIN, ANSI, ASTM, JIS, BSW 3. Strength: Grade 4.8,Grade 8.8,Grade10.9, Grade12.9 A2-70, A4-70, […]

Hexagonal Structural ASTM Heavy Hex Bolt

Hexagonal Structural ASTM Heavy Hex Bolt

Hexagonal Structural ASTM a325 a490 Heavy Hex Bolt Standard: ASME B 18.2.1,DIN6914 Size: 1/2”-1 1/2”,M12-M36 Material: Carbon Steel, Alloy Steel Grade: ASTM A325, A490,CL10.9 Thread: M, UNC, UNF Finish: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G. Packing: bulk in cartons (25kg Max.)+ wood Pallet or according to customer special demand Application: Structural Steel; Metal […]

Black Heavy Hex Bolt

Black Heavy Hex Bolt ASTM A325 A490

Black Heavy Hex Bolt ASTM A325 A490 High Tensile Bolts Finish: ZINC, Plain Material: Stainless Steel, Steel, Carbon Steel, Alloy Steel, Stainless Steel Certificate: ISO9001:2008 Surface treatment: Black size: 1/2″-4″, M5-M64 Grade: A307, A325, A490 Type: Heavy Hex bolt and nut All of the products widely used in automobiles, major engineering projects, mechanical engineering, petrochemical […]

ASTM A193 Stainless Steel Metric Heavy Hex Bolt

ASTM A193 Stainless Steel Metric Heavy Hex Bolt

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A193 Grade B7 Heavy Hexagon Bolt

A193 Grade B7 Heavy Hexagon Bolt

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A193 Grade B7 Grade 10.9 Heavy Hex Bolts

A193 Grade B7 Grade 10.9 Heavy Hex Bolts

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1/2-13 X 1 A193 B7 Heavy Hex Hexagon Bolt Zinc

1/2-13 X 1 A193 B7 Heavy Hex Hexagon Bolt Zinc

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1/2-13 X 1 ASTM A193 GR B7 Heavy Hex Bolt Black Oxide

1/2-13 X 1 ASTM A193 GR B7 Heavy Hex Bolt Black Oxide

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12-13 X 1 34 A193 B7 ZINC PLATED HEAVY HEX BOLT

1/2-13 X 1 3/4 A193 B7 ZINC PLATED HEAVY HEX BOLT

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1/2-13 X 1 3/4 ASTM A193 B7 HEAVY HEX BOLT PLAIN

1/2-13 X 1 3/4 ASTM A193 B7 HEAVY HEX BOLT PLAIN

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1 14-8 X 4 14 A193 B7 HEAVY HEX BOLT PLAIN

1 1/4-8 X 4 1/4 A193 B7 HEAVY HEX BOLT PLAIN

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Stainless Steel Round U-shaped Bolts

Stainless Steel Round U-shaped Bolts

Stainless Steel Round U-shaped Bolts, All Sizes 304 Stainless Steel Standard U Bolt, truck u bolt, DIN, DIN3570, IFI-136, 304 Stainless steel flat u bolt, high strength and hardness stainless steel square u bolt, clamp u-bolt China supplier Stainless Steel Round U-shaped Bolts PARAMETERS: 1.Standard: DIN3570, IFI-136 2.Grade: A193 B8, B8M 3.Material: Stainless steel. 4.Size: […]

Standard Sizes 304 Stainless Steel U Bolt

All Sizes 304 Stainless Steel U Bolt

All Sizes 304 Stainless Steel U Bolt, truck u bolt, DIN, DIN3570, IFI-136, 304 Stainless steel flat u bolt, high strength and hardness stainless steel square u bolt, clamp u-bolt China supplier All Sizes 304 Stainless Steel U Bolt PARAMETERS: 1.Standard: DIN3570, IFI-136 2.Grade: A193 B8, B8M 3.Material: Stainless steel. 4.Size: M4-M36 5.Finish: self color […]