ASTM A193 B8M Bolt
Grade A193 Flange Head Bolt, ASTM A193 B8M Hex Head Bolt, ASME SA193 Grade B8M U Bolt, AISI 316 Class 1 Grade B8M Allen Bolt, B8M Grade Stud Bolt.
Austenitic SS bolts are also known as Grade B8 bolts. While alloy 304 makes grade B8 bolts, alloy 316 is used to make ASTM A193 B8m bolts. The A193 B8M Heavy Hex Bolts are preferred above grade B8 because of their enhanced corrosion resistance to seawater and brine solutions. This makes them ideal for use in maritime engineering. The term “marine grade” may also describe these A193 B8M Class bolts.
These procedures often enhance the alloy’s properties, resulting in a more excellent B8M Grade Bolts Yield Strength. Additionally, the corrosion resistance is strengthened, particularly if the bolts need to be welded. There may be a concern about intergranular corrosion because the A193 B8M Substance has a slightly high carbon content. The material reduces this risk by eliminating undesirable phases and carbides from the alloy of Astm a193 grade b8m stud bolts through solution annealing. The ASTM A193 Gr b8m bolt is a witness to features like better stress and higher creep to rupture; therefore, using this grade is helpful for various high-pressure applications.
About ASTM A193 B8M Bolt
ASTM A193 B8M Hex Bolt, SA193 Grade B8M Allen Bolt, Grade A193 Hex Head Bolt, ASME SA193 Grade B8M Anchor Bolt, AISI 316 Class 2 Grade B8M U Bolt, A193 B8M Flange Head Bolt, B8M Grade Eye Bolt.
The ASTM A193 B8M Heavy Hex Bolts may also display a greater tensile strength at high temperatures. Solution annealing is the only technique applied to fasteners that comply with ASTM A193 B8m Class 1. In contrast, the alloy will undergo a strain or work hardening procedure if the bolts have already been designated class 2, such as ASTM a193 b8m class 2 bolts. The final tensile strength of class 2 ASTM A193 Gr B8m Studs increases due to plastic deformation.
ASTM A193 B8M Bolt Specification
| Dimensions | ASME B18.2.1, B18.3 |
| Melt Origin | Korea, South America, Japan, East Europe, |
| Mandatory Requirements | Free from Mercury & Radioactive Contamination |
| Additional Certifications | PED 97/ 23/ EC Certified, Merkblatt AD 2000 W2 Certified |
| Certification | Dual Certified As per ASTM & ASME Codes |
| Additional Requirements | NACE MR0103 / MR0175 / ISO 15156 Compliance |
| Threads Configuration | ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads |
Chemical Composition ASTM A193 B8M Bolt
| Element | Carbon | Manganese | Phosphorus, max | Sulfur, max | Silicon | Chromium | Nickel | Molybdenum |
| B8M (AISI 316) | 0.08% max | 2.00% max | 0.045% | 0.030% | 1.00% max | 16.0 – 18.0% | 10.0 – 14.0% | 2.00 – 3.00% |
Mechanical Properties ASTM A193 B8M Bolt
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min | Hardness max |
| B8M Class 1 | All | 515 | 205 | 30 | 50 | 223 HBW or 96 HRB |
| B8M Class 2 | 760 | 665 | 15 | 45 | 321 HBW or 35 HRC | |
| Over M20 to M24 incl | 690 | 550 | 20 | 45 | 321 HBW or 35 HRC | |
| Over M24 to M30 incl | 655 | 450 | 25 | 45 | 321 HBW or 35 HRC | |
| Over M30 to M36 incl | 620 | 345 | 30 | 45 | 321 HBW or 35 HRC |
Dimensions Of ASTM A193 B8M Bolt
ASTM A193 Grade B8 Bolts Dimensions Chart :
| Nominal Size or Basic Product Diameter | Full-Size Body Diameter, E | Width Across Flats, F | Width Across Corners, G | Head Height, H Basic | Radius of Fillet, R | Nominal Thread Length for Bolt Lengths, LT |
|||||||||
| inch | mm | Max | Min | Basic inch | Max | Min | Max | Min | Basic inch | Max | Min | Max | Min | 6 in. and Shoter | Over 6 in. |
| 1⁄4 | 0.25 | 0.26 | 0.237 | 7⁄16 | 0.438 | 0.425 | 0.505 | 0.484 | 11⁄64 | 0.188 | 0.15 | 0.03 | 0.01 | 0.75 | 1 |
| 5⁄16 | 0.3125 | 0.324 | 0.298 | 1⁄2 | 0.5 | 0.484 | 0.577 | 0.552 | 7⁄32 | 0.235 | 0.195 | 0.03 | 0.01 | 0.875 | 1.125 |
| 3⁄8 | 0.375 | 0.388 | 0.36 | 9⁄16 | 0.562 | 0.544 | 0.65 | 0.62 | 1⁄4 | 0.268 | 0.226 | 0.03 | 0.01 | 1 | 1.25 |
| 7⁄16 | 0.4375 | 0.452 | 0.421 | 5⁄8 | 0.625 | 0.603 | 0.722 | 0.687 | 19⁄64 | 0.316 | 0.272 | 0.03 | 0.01 | 1.125 | 1.375 |
| 1⁄2 | 0.5 | 0.515 | 0.482 | 3⁄4 | 0.75 | 0.725 | 0.866 | 0.826 | 11⁄32 | 0.364 | 0.302 | 0.03 | 0.01 | 1.25 | 1.5 |
| 5⁄8 | 0.625 | 0.642 | 0.605 | 15⁄16 | 0.938 | 0.906 | 1.083 | 1.033 | 27⁄64 | 0.444 | 0.378 | 0.06 | 0.02 | 1.5 | 1.75 |
| 3⁄4 | 0.75 | 0.768 | 0.729 | 11⁄8 | 1.125 | 1.088 | 1.299 | 1.24 | 1⁄2 | 0.524 | 0.455 | 0.06 | 0.02 | 1.75 | 2 |
| 7⁄8 | 0.875 | 0.895 | 0.852 | 1 5⁄16 | 1.312 | 1.269 | 1.516 | 1.447 | 37⁄64 | 0.604 | 0.531 | 0.06 | 0.02 | 2 | 2.25 |
| 1 | 1 | 1.022 | 0.976 | 1 1⁄2 | 1.5 | 1.45 | 1.732 | 1.653 | 43⁄64 | 0.7 | 0.591 | 0.09 | 0.03 | 2.25 | 2.5 |
| 1 1⁄8 | 1.125 | 1.149 | 1.098 | 1 11⁄16 | 1.688 | 1.631 | 1.949 | 1.859 | 3⁄4 | 0.78 | 0.658 | 0.09 | 0.03 | 2.5 | 2.75 |
| 1 1⁄4 | 1.25 | 1.277 | 1.223 | 1 7⁄8 | 1.875 | 1.812 | 2.165 | 2.066 | 27⁄32 | 0.876 | 0.749 | 0.09 | 0.03 | 2.75 | 3 |
| 1 3⁄8 | 1.375 | 1.404 | 1.345 | 2 1⁄16 | 2.062 | 1.994 | 2.382 | 2.273 | 29⁄32 | 0.94 | 0.81 | 0.09 | 0.03 | 3 | 3.25 |
| 1 1⁄2 | 1.5 | 1.531 | 1.47 | 2 1⁄4 | 2.25 | 2.175 | 2.598 | 2.48 | 1 | 1.036 | 0.902 | 0.09 | 0.03 | 3.25 | 3.5 |
| 1 5⁄8 | 1.625 | 1.658 | 1.591 | 2 7⁄16 | 2.438 | 2.356 | 2.815 | 2.616 | 1 3⁄32 | 1.116 | 0.978 | 0.09 | 0.03 | 3.5 | 3.75 |
| 1 3⁄4 | 1.75 | 1.785 | 1.716 | 2 5⁄8 | 2.625 | 2.538 | 3.031 | 2.893 | 1 5⁄32 | 1.196 | 1.054 | 0.12 | 0.04 | 3.75 | 4 |
| 1 7⁄8 | 1.875 | 1.912 | 1.839 | 2 13⁄16 | 2.812 | 2.719 | 3.248 | 3.099 | 1 1⁄4 | 1.276 | 1.13 | 0.12 | 0.04 | 4 | 4.25 |
| 2 | 2 | 2.039 | 1.964 | 3 | 3 | 2.9 | 3.464 | 3.306 | 1 11⁄32 | 1.388 | 1.175 | 0.12 | 0.04 | 4.25 | 4.5 |
| 2 1⁄4 | 2.25 | 2.305 | 2.214 | 3 3⁄8 | 3.375 | 3.262 | 3.897 | 3.719 | 1 1⁄2 | 1.548 | 1.327 | 0.19 | 0.06 | 4.75 | 5 |
| 2 1⁄2 | 2.5 | 2.559 | 2.461 | 3 3⁄4 | 3.75 | 3.625 | 4.33 | 4.133 | 1 21⁄32 | 1.708 | 1.479 | 0.19 | 0.06 | 5.25 | 5.5 |
| 2 3⁄4 | 2.75 | 2.827 | 2.711 | 4 1⁄8 | 4.125 | 3.988 | 4.763 | 4.546 | 1 13⁄16 | 1.869 | 1.632 | 0.19 | 0.06 | 5.75 | 6 |
| 3 | 3 | 3.081 | 2.961 | 4 1⁄2 | 4.5 | 4.35 | 5.196 | 4.959 | 2 | 2.06 | 1.815 | 0.19 | 0.06 | 6.25 | 6.5 |
| 3 1⁄4 | 3.25 | 3.335 | 3.21 | 4 7⁄8 | 4.875 | 4.712 | 5.629 | 5.372 | 2 3⁄16 | 2.251 | 1.936 | 0.19 | 0.06 | 6.75 | 7 |
| 3 1⁄2 | 3.5 | 3.589 | 3.461 | 5 1⁄4 | 5.25 | 5.075 | 6.062 | 5.786 | 2 5⁄16 | 2.38 | 2.057 | 0.19 | 0.06 | 7.25 | 7.5 |
| 3 3⁄4 | 3.75 | 3.858 | 3.726 | 5 5⁄8 | 5.625 | 5.437 | 6.495 | 6.198 | 2 1⁄2 | 2.572 | 2.241 | 0.19 | 0.06 | 7.75 | 8 |
| 4 | 4 | 4.111 | 3.975 | 6 | 6 | 5.8 | 6.928 | 6.612 | 2 11⁄16 | 2.764 | 2.424 | 0.19 | 0.06 | 8.25 | 8.5 |
Different Types Of ASTM A193 B8M Bolt
Different Types Of Bolts:
ASTM A193 Grade B8M Hex Bolts
ASTM A193 Grade B8M Carriage Bolts
ASTM A193 Grade B8M Stud Bolts
ASTM A193 Grade B8M Hex Head Bolts
ASTM A193 Grade B8M Forged Hook Bolts
ASTM A193 Grade B8M Torx Bolts
ASTM A193 Grade B8M Countersunk Bolts
ASTM A193 Grade B8M Flange Head Bolts
ASTM A193 Grade B8M Allen Bolts
ASTM A193 Grade B8M 12-Point Flange Bolts
ASTM A193 Grade B8M Eye Bolts
ASTM A193 Grade B8M Bolts
ASTM A193 Grade B8M U Bolts
ASTM A193 Grade B8M J Bolts
ASTM A193 Grade B8M Elevator Bolt
ASTM A193 Grade B8M Threaded Expansion Anchor Bolt
ASME SA 193 B8M High Performance Anchor Bolts
