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ASTM A193 B8M Bolt

ASTM A193 B8M Bolt

ASTM A193, Grade B8M Class 1 Stainless steel, AISI 316, carbide solution treated.
Stainless steel, AISI 316, carbide solution treated.
ASTM A193, Grade B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
Specialized manufacturer of: ASTM A193 Carriage Bolt, ASTM A193 B8M Flange Bolt, ASTM A193 heavy hex bolt, ASTM A193 B8M Hex Cap Screw, ASTM A193 B8M Allen Cap Screw, ASTM A193 Machine Screw

ASTM A193 B8M

ASTM A193 Grade B8M Class 1 fasteners are similar to Grade B8 but instead are manufactured from AISI 316 stainless steel as opposed to AISI 304 stainless steel. 

ASTM A193 specification covers alloy steel and stainless steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature or high  pressure service, or other special purpose applications.Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B8,B8M and so forth. Selection will depend upon design, service conditions, mechanical properties, and high temperature characteristics.Material according to ASTM A193 B8M is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.

ASTM A193 B8M HEX BOLT

ASTM A193 B8M HEX BOLTS, ASTM A193 HEX HEAD BOLT, B8M SOCKET CAP SCREW, SS ASTM A193 HEX CAP SCREW, HIGH TENSILE FASTENERS, ASTM A193 B8M SOCKET CAP SCREW, ASTM A193 B8M FLANGE BOLT SUPPLIER & EXPORTER

A193 Grades

  • ASTM A193 B7: Alloy steel, AISI 4140 or 4142, quenched and tempered
  • ASTM A193 B6 : Stainless steel, AISI 410, heat treated
  • ASTM A193 B8 : Class 1 Stainless steel, AISI 304, carbide solution treated.
  • ASTM A193 B8M : Class 1 Stainless steel, AISI 316, carbide solution treated.
  • ASTM A193 B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
  • ASTM A193 B8M Class 2  Stainless steel, AISI 316, carbide solution treated, strain hardened
  • ASTM A193 B8T: Class 1 or 2 Stainless steel, AISI 321, with additional element of Titanium
  • ASTM A193 B16: Chromium-Molybdenum-Vanadium, similar to B7 with Vandium added
  • ASTM A193 B7M  Similar properties as B7 but with specialized heat treating to create differing mechanical properties
  • ASTM A193 B8R: Stainless steel, AISI 209, also known as Nitronic 50, nitrogen strengthened
  • ASTM A193 B8S: Stainless Steel, AISI 218, also known as Nitronic 60, nirtrogen strengthened

TAGS: ASTM A193 Grade B8 Class 2 Bolts : A193 B8M,Astm A93 grade B8M,A193 B8M Class 2,Astm A193 B8M,B8M Bolts,B8M Studs,Grade B8M,B8M Stainless,Astm A193 Grade B8M Stud Bolts etc

Viha Steel is your source for ASTM A193 B8M Class 2 Bolts from 1/4” to 2” Diameter in multiple lengths with standard or custom thread lengths. These bolts are typically bought and sold in a plain, bare metal finish but are often hot-dip galvanized, zinc plated, Xylan coated, PTFE coated, or otherwise coated for corrosion resistance. The IFI abstract of ASTM A193 indicates that the mechanical requirements of B8 studs and B8 hex bolts are actually the same as B8M studs, B8m hex bolts, and other B8M fasteners.

A193 Mechanical Properties

Grade Size Tensile ksi, min Yield, ksi, min Elong, %, min RA % min HBW HRC
B7 Up to 2-1/2 125 105 16 50 321 max 35 max
2-5/8 – 4 115 95 16 50
4-1/8 – 7 100 75 18 50
B8 Class 1 All 75 30 30 50 223 max 35 max
B8M Class 1 All 75 30 30 50 223 max 96 max
B8 Class 2 Up to 3/4 125 100 12 35 321 max 35 max
7/8 – 1 115 80 15 35
1-1/8 – 1-1/4 105 65 20 35
1-3/8 – 1-1/2 100 50 28 45
B8M Class 2 Up to 3/4 110 95 15 45 321 max 35 max
7/8 – 1 100 80 20 45
1-1/8 – 1-1/4 95 65 25 45
1-3/8 – 1-1/2 90 50 30 45

Grade Size Tensile ksi, min Yield, ksi, min Elong, %, min RA % min HBW HRC
B8M Class 1 All 75 30 30 50 223 max 96 max
B8M Class 2 Up to 3/4 110 95 15 45 321 max 35 max
7/8 – 1 100 80 20 45
1-1/8 – 1-1/4 95 65 25 45
1-3/8 – 1-1/2 90 50 30 45

A193 Chemical Properties

Element B7 (AISI 4140) B8 (AISI 304) B8M (AISI 316)
Carbon 0.38 – 0.48% 0.08% max 0.08% max
Manganese 0.75 – 1.00% 2.00% max 2.00% max
Phosphorus, max 0.035% 0.045% 0.045%
Sulfur, max 0.040% 0.030% 0.030%
Silicon 0.15 – 0.35% 1.00% max 1.00% max
Chromium 0.80 – 1.10% 18.0 – 20.0% 16.0 – 18.0%
Nickel 8.0 – 11.0% 10.0 – 14.0%
Molybdenum 0.15 – 0.25% 2.00 – 3.00%

A193 Recommended Hardware

Bolt Grade Nuts Washers
B7 A194 Grade 2H 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

Heat treated conditions for the ferritic materials include:

  • normalized & tempered
  • quenched & tempered.

Heat treated conditions for the austentic stainless steels include:

  • Carbide solution treated (Class 1)
  • Carbide solution treated after finishing (Class 1A)
  • Carbide solution treated nitrogen-bearing stainless steels (Class 1B & 1C)
  • Carbide solution treated by cooling rapidly from the rolling temperature (Class 1D)
  • Carbide solution treated and Strain-hardened (Classes 2, 2B, and 2C)

ASTM A193 TENSILE STRENGTH / HARDNESS CHART

Grade and Class Diameter Tensile Strength Min KSI Yield Strength 0.2% Offset KSI Elongation in 4D, Min, % Reduction of Area Min, % Hardness Max Brinell Hardness Max Rockwell
B5 up to 4″ incl 100 80 16 50
B6 up to 4″ incl 110 85 15 50
B6X up to 4″ incl 90 70 16 50 C26
B7 to 2-1/2″ 125 105 16 50 C35
over 2-1/2 to 4″ 115 95 16 50 C35
over 4″ to 7″ 100 75 18 50 C35
B7M up to 4″ incl 100 80 18 50 235 B99
over 4″ to 7″ 100 75 18 50 235 B99
B16 to 2-1/2″ 125 105 18 50 321 C35
over 2-1/2″ to 4″ 110 95 17 45 321 C35
over 4″ to 7″ 100 85 16 45 321 C35
Classes 1 and 1D: B8, B8M, B8P, B8LN, B8ML ALL 75 30 30 50 223 B96
Class 1: B8C, B8T ALL 75 30 30 50 223 B96
Class 1A: B8A, B8CA, B8MA, B8PA, B8TA, B8LNA, B8MLNA, B8NA, B8MNA, B8MLCuNA ALL 75 30 30 50 192 B90
Classes 1B & 1D: B8N, B8MN, B8MLCuN ALL 80 35 30 40 223 B96
Class 1C and 1D: B8R ALL 100 55 35 55 271 C28
Class 1C: B8RA ALL 100 55 35 55 271 C28
Classes 1C and 1D: B8S ALL 95 50 35 55 271 C28
Classes 1C: B8SA ALL 95 50 35 55 271 C28
Class 2: B8, B8C, B8P, B8T, B8N to 3/4″ 125 100 12 35 321 C35
over 3/4″ to 1″ 115 80 15 35 321 C35
over 1″ to 1-1/4″ 105 65 20 45 321 C35
over 1-1/4 to 1-1/2″ incl 100 50 28 45 321 C35
Class 2 B8M, B8MN, B8MLCuN to 3/4″ 110 96 15 45 321 C35
over 3/4″ to 1″ 100 80 20 45 321 C35
over 1″ to 1-1/4″ 95 65 25 45 321 C35
over 1-1/4 to 1-1/2″ incl 90 50 30 45 321 C35
Class 2B: B8, B8M2 to 2″ incl 95 75 25 40 321 C35
over 2″ to 2-1/2″ incl 90 65 30 40 321 C35
over 2-1/2 ” to 3″ incl 80 55 30 40 321 C35
Class 2C: B8M3 to 2″ incl 85 65 30 60 321 C35
over2″ 85 60 30 60 321 C35

ASTM A193 Characteristics

Grade Description Diameter Tensile Strength, min. Yield Strength, min. Hardness, max. Marking
ASTM A193 B6 S41000 (410) Up to 4” 110 85 B6
ASTM A193 B7 Chromium-Molybdenum 2 1/2” and under 125 105 321 HB or 35 HRC B7
over 2 1/2” to 4” 115 95 321 HB or 35 HRC
over 4” to 7” 100 75 321 HB or 35 HRC
ASTM A193 B7M Chromium-Molybdenum 4” and under 100 80 235 HB or 99 HRB B7M
over 4” to 7” 100 75 235 HB or 99 HRB
ASTM A193 B16 Chromium-Molybdenum- Vanadium 2 1/2” and under 125 105 321 HB or 35 HRC B16
over 2 1/2” to 4” 110 95 321 HB or 35 HRC
over 4” to 8” 100 85 321 HB or 35 HRC
ASTM A193 B8 class 1 S30400 (304) all 75 30 223 HB or 96 HRB B8
ASTM A193 B8 class 2 S30400 (304) 3/4” and under 125 100 321 HB or 35 HRC B8SH
over 3/4” to 1” 115 80 321 HB or 35 HRC
over 1” to 1 1/4” 105 65 321 HB or 35 HRC
over 1 1/4” to 1 1/2” 100 50 321 HB or 35 HRC
ASTM A193 B8C class 1 S34700 (347) all 75 30 223 HB or 96 HRB B8C
ASTM A193 B8C class 2 S34700 (347) 3/4” and under 125 100 321 HB or 35 HRC B8CSH
over 3/4” to 1” 115 80 321 HB or 35 HRC
over 1” to 1 1/4” 105 65 321 HB or 35 HRC
over 1 1/4” to 1 1/2” 100 50 321 HB or 35 HRC
ASTM A193 B8M class 1 S31600 (316) all 75 30 223 HB or 96 HRB B8M
ASTM A193 B8M class 2 S31600 (316) 3/4” and under 110 95 321 HB or 35 HRC B8MSH
over 3/4” to 1” 100 80 321 HB or 35 HRC
over 1” to 1 1/4” 95 65 321 HB or 35 HRC
over 1 1/4” to 1 1/2” 90 50 321 HB or 35 HRC
ASTM A193 B8T class 1 S32100 (321) all 75 30 223 HB or 96 HRB B8T
ASTM A193 B8T class 2 S32100 (321) 3/4” and under 125 100 321 HB or 35 HRC B8TSH
over 3/4” to 1” 115 80 321 HB or 35 HRC
over 1” to 1 1/4” 105 65 321 HB or 35 HRC
over 1 1/4” to 1 1/2” 100 50 321 HB or 35 HRC
ASTM A193 B8R S20910 all 100 55 271 HB or 28 HRC B8R
ASTM A193 B8S S21800 all 95 50 271 HB or 28 HRC B8S

 

OTHER TYPES OF ASTM A193 B8M HEX BOLT

ASTM A193 B8M Hex Bolts SS ASTM A193 B8M Hex Bolt
  • Stainless Steel B8M heavy hex bolt
  • ASTM A193 B8M hex screw Exporter
  • ASTM A193 B8M countersunk slotted screw
  • ASTM A193 B8M Hex Head Bolt Supplier
  • ASTM A193 Grade B8M Plow Bolt Supplier
  • Grade B8M Hanger Bolt
  • Stainless Steel B8M Bolts
  • B8M Stainless Steel Bolts
  • ASTM A193 Anchor Bolt Exporter
  • ASTM A193 Grade B8M U Bolt
  • ASTM A193 Socket Cap Screw
  • ASTM A193 B8M hex cap screw Supplier
  • B8M socket cap screw
  • ASTM A193 Bolts Manufacturer
  • Grade B8M Machine Bolt Distributor
  • B8M Anchor Bolt
  • ASTM A193 Grade B8M Step Bolt Manufacturer
  • ISO Certified ASTM A193 B8M Head Bolts
  • ASTM A193 B8M Grub Screw
  • B8M Step Bolt Stockist
  • ASTM A193 Grade B8M J Bolt
  • Grade B8M Carriage Bolt Exporter

ASTM A193 B8M HEX BOLT PRICE IN INDIA

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