ASTM A193 B7M STUD BOLTS
Why Lightning Bolt?
Lightning Bolt & Supply has been servicing North America’s industrial fastener needs for over 25 years. Since then, our focus on the production of high quality parts at competitive pricing has allowed us to become an industry leader. Our niche in exotic high nickel alloy fasteners include materials such as: hastelloy, Inconel, monel, A-286, 904L, Alloy-20, duplex stainless as well as many additional alloys.
Being centrally headquartered in Baton Rouge, Louisiana, we are capable of shipping to jobsites all over the world. Many of our industrial projects that we supply material to include anchor bolts, and also stud bolts of many different ASTM grades. These include B7, L7, B16, B8, B8M, stain hardened and many more. In addition to being an ISO certified fastener manufacturer, we were awarded “Corporate Supplier of the Year” by WBENC.
ASTM A193 B7, B7M, B16
Identification | B7 & B7M | B16 | ||
|---|---|---|---|---|
Grade | Chromium - Molybdenum (C4140,4142,4145,4140 H, 4142 H, 4145H) | Chromium - Molybdenum - Vanadium | ||
Element | Range | Tolerance +/- | Range | Tolerance +/- |
| Carbon | 0.37 - 0.49 | 0.02 | 0.36 - 0.44 | 0.02 |
| Manganese | 0.65 - 1.10 | 0.04 | 0.45 - 0.70 | 0.03 |
| Phosphorus, max | 0.035 | 0.005 over | 0.035 | 0.005 over |
| Sulfur, max | 0.040 | 0.005 over | 0.040 | 0.005 over |
| Silicon | 0.15 - 0.35 | 0.02 | 0.15 - 0.35 | 0.02 |
| Chromium | 0.75 - 1.20 | 0.05 | 0.8 - 1.15 | 0.05 |
| Molybdenum | 0.15 - 0.25 | 0.02 | 0.50 - 0.65 | 0.03 |
| Vanadium | - | - | 0.25 - 0.35 | 0.03 |
| Aluminum, max% | - | - | 0.015 | - |
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 |
