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
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
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 |
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 |
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