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Standard Specification For 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
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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
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 |
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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 |
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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 |
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