Hex bolts are one of the most easily available fasteners across several markets. Not only are they very versatile, but a manufacturer could produce them using varied Ansi B18 2.1 Bolts Dimensions. Asme B18.2.1 is a standard that covers nine different products including square bolts, Asme B18.2.1 Hex Bolts, and screws in the inch series. Although used synonymously, there are some differences that separate Asme B18.2.1 Bolts And Screws.
For instance, While they both are externally threaded fasteners intended to be inserted in holes during assembly, the design of as Ansi/asme B18.2.1 Heavy Hex Bolt permits it to be either to be tightened or released by torquing a nut. On the other hand, a screw is intended to assemble using a mated nut that could either have a preformed internal thread or the nut would be capable of forming its own thread. Therefore a screw could be either tightened or released simply by torquing its head.
Keeping in accordance with the standard, any product manufactured, including the Hexagon Bolts Ansi B18.2.1 is to be uncoated or unplated. Since the standard is an ASME one, manufacturers are expected to follow certain parameters while producing the Asme B18 2.1 Stud Bolts. ASME standards take the following points into consideration width across the flats, head height, body diameter, length tolerances of the Asme B18.2.1 Bolts, thread lengths, as well as general dimensional tolerances.
Dimensions |
ASME B18.2.1, B18.3 |
|---|---|
Melt Origin |
South America/East Europe/JapanKorea/ |
Product Origin |
Made in India |
Threads Configuration |
ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads |
Certification |
Dual Certified As per ASTM & ASME Codes |
Additional Certifications |
PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
Mandatory Requirements |
Free from Mercury & Radioactive Contamination |
Additional Requirements |
NACE MR0103 / MR0175 / ISO 15156 Compliance |
| Nominal Size or Basic product Diameter |
Full Size Body Diameter, E | Width Across Flats, F | Width Across Corners, G | Head Height, H | Radius of Fillet, R | Thread Length for Bolt Lengths, LT |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 in. and Shorter | Over 6 in. | ||||||||||||||
| Max | Min | Basic | Max | Min | Max | Min | Basic | Max | Min | Max | Min | Nom | Nom | ||
| 3/8 | 0.3750 | 0.388 | 0.360 | 11/6 | 0.688 | 0.669 | 0.794 | 0.763 | 1/4 | 0.268 | 0.226 | 0.03 | 0.01 | 1.000 | 1.250 |
| 1/2 | 0.5000 | 0.515 | 0.482 | 7/8 | 0.875 | 0.850 | 1.010 | 0.969 | 11/32 | 0.364 | 0.302 | 0.03 | 0.01 | 1.250 | 1.500 |
| 5/8 | 0.6250 | 0.642 | 0.605 | 11/16 | 1.062 | 1.031 | 1.227 | 1.175 | 27/64 | 0.444 | 0.378 | 0.06 | 0.02 | 1.500 | 1.750 |
| 3/4 | 0.7500 | 0.768 | 0.729 | 1 1/4 | 1.250 | 1.212 | 1.443 | 1.383 | 1/2 | 0.524 | 0.455 | 0.06 | 0.02 | 1.750 | 2.000 |
| 7/8 | 0.8750 | 0.895 | 0.852 | 1 7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 37/64 | 0.604 | 0.531 | 0.06 | 0.02 | 2.000 | 2.250 |
| 1 | 1.000 | 1.022 | 0.976 | 1 5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 43/64 | 0.700 | 0.591 | 0.09 | 0.03 | 2.250 | 2.500 |
| 1 1/8 | 1.1250 | 1.149 | 1.098 | 1 13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 3/4 | 0.780 | 0.658 | 0.09 | 0.03 | 2.500 | 2.750 |
| 1 1/4 | 1.2500 | 1.277 | 1.223 | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 27/32 | 0.876 | 0.749 | 0.09 | 0.03 | 2.750 | 3.000 |
| 1 3/8 | 1.3750 | 1.404 | 1.345 | 2 3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 29/32 | 0.940 | 0.810 | 0.09 | 0.03 | 3.000 | 3.250 |
| 1 1/2 | 1.5000 | 1.531 | 1.470 | 2 3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 1 | 1.036 | 0.902 | 0.09 | 0.03 | 3.250 | 3.500 |
| 1 5/8 | 1.6250 | 1.658 | 1.591 | 2 9/16 | 2.562 | 2.481 | 2.959 | 2.829 | 1 3/32 | 1.116 | 0.978 | 0.09 | 0.03 | 3.500 | 3.750 |
| 1 3/4 | 1.7500 | 1.785 | 1.716 | 2 3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 1 5/32 | 1.196 | 1.054 | 0.12 | 0.04 | 3.750 | 4.000 |
| 1 7/8 | 1.8750 | 1.912 | 1.839 | 2 15/16 | 2.938 | 2.844 | 3.392 | 3.242 | 1 1/4 | 1.276 | 1.130 | 0.12 | 0.04 | 4.000 | 4.250 |
| 2 | 2.000 | 2.039 | 1.964 | 3 1/8 | 3.125 | 3.025 | 3.608 | 3.449 | 1 11/32 | 1.388 | 1.175 | 0.12 | 0.04 | 4.250 | 4.500 |
| 2 1/4 | 2.2500 | 2.305 | 2.214 | 3 1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 1 1/2 | 1.548 | 1.327 | 0.19 | 0.06 | 4.750 | 5.000 |
| 2 1/2 | 2.5000 | 2.559 | 2.461 | 3 7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 1 21/32 | 1.708 | 1.479 | 0.19 | 0.06 | 5.250 | 5.500 |
| 2 3/4 | 2.7500 | 2.827 | 2.711 | 4 1/4 | 4.250 | 4.112 | 4.907 | 4.688 | 1 13/16 | 1.869 | 1.632 | 0.19 | 0.06 | 5.750 | 6.000 |
| 3 | 3.000 | 3.081 | 2.961 | 4 5/8 | 4.625 | 4.475 | 5.340 | 5.102 | 2 | 2.060 | 1.815 | 0.19 | 0.06 | 6.250 | 6.500 |
| Material Standards for ASME B18.2.1 Fasteners | |
|---|---|
| ASTM A193 | Standard specification for alloy steel and stainless steel bolting materials for high temperature or high pressure service and other special purpose applications |
| ASTM A307 | Standard specification for carbon steel bolts and studs, 60000 psi tensile strength |
| ASTM A320 | Standard specification for alloy steel and stainless steel bolting for low-temperature service |
| ASTM A354 | Standard specification for quenched and tempered alloy steel bolts, studs, and other externally threaded fasteners |
| ASTM A449 | Standard specification for hex cap screws, bolts and studs, steel, heat treated, 120/105/90 ksi minimum tensile strength, general use |
| ASTM F468 | Standard specification for nonferrous bolts, hex cap screws, and studs for general use |
| ASTM F593 | Standard specification for stainless steel bolts, hex cap screws, and studs |
| MIL-F-18240 | Fastener element, self-locking, threaded fastener, 250°F Maximum |
| SAE J429 | Mechanical and material requirements for externally threaded fasteners |
