ASTM A193 Grade B16 specification describes the specifications of the external threaded fasteners (bolts, studs, screws, threaded rods, and others) that should be used in high-tensile bolting in harsh conditions. These fasteners are specifically made to be used in service at high temperature and high pressure, or both.
The ASTM standard outlines the necessary requirements like chemical composition, mechanical properties (tensile, yield strength, and hardness), heat treatment, and marking of the product. It’s also the first raw material that is required to be used in the production. B16 in itself is a chromium-molybdenum-vanadium alloy steel that develops the required strength through heat treatment.
This is an alloy steel material that is extensively used in petroleum and chemical construction fields in the manufacture of high-pressure vessels, valves, fittings, and flanges, among others. Although material is sometimes packaged with National Coarse (UNC) thread Pitch, traditional high-pressure usage usually indicates the thread count of 8 threads per inch (tpi) in sizes larger than an inch.
ASTM A194 Grade 4 Nuts, A193 B16 Alloy Steel Bolts, ASTM A193 Grade B16 Bolts, Alloy Steel B16 Hex Bolts, Alloy Steel B16 Stud Bolts, A194 Gr 4 Heavy Hex Nuts Supplier
We, Jade Special Metals, are a major source, exporter, manufacturer, and leading supplier of specialty industrial fasteners. ASTM A193 Grade B16 Alloy Steel Bolts are some of the essential elements on which our core inventory will be based. We are also known experts, and we are committed to providing a broad and wide variety of bolts and nuts to meet all the specific demands of our customers around the world.
Our manufacturing unit is aimed at delivering excellence through standard and custom-made manufacture of bolts and nuts of superior quality. All our products have been assured to meet the major specifications of international products such as ASTM, ASME, JIS, API, DIN, EN, and BS. In collaboration with our customers, we manufacture products in sizes and shapes needed by them, which are of superior quality, meet standards, and are sold at competitive prices in the industrial market. The high-quality assurance process we have, which is characterized by high-level testing procedures, is what guarantees the high-quality performance of all fasteners we manufacture.
Table of Contents
- Types of A193 Grade B16 Fasteners
- ASTM A193 B16 Bolts Specification
- Chemical Composition of ASTM A193 Grade B16 Fasteners
- ASTM A193 Grade B16 Mechanical Properties (Inch Product)
- ASTM A193 Grade B16 Equivalent Grades
- ASTM A193 Grade B16 Torque Chart
- Dimension of SA193 B16 Stud Bolts
- A193 B16 Heavy Hex Bolts Dimensions
- ASME SA193 Grade B16 Bolt Size Chart
- ASTM A193 B16 Studs Bolts Hardness Chart
- ASTM A193 B16 Bolts Inventory
- Applications of ASTM A193 B16 Bolts
Types of A193 Grade B16 Fasteners
ASTM A193 B16 Socket Heads
ASTM A193 B16 Double End Studs
ASTM A193 B16 CSK Screws
ASTM A193 B16 Set Screws
ASTM A193 B16 Stud Bolts
ASTM A193 B16 Hex Bolts
ASTM A193 B16 Anchor Rods
ASTM A193 B16 Threaded Rod
ASTM A193 B16 Round Bars
ASTM A193 B16 Heavy Hex Bolts
ASTM A193 B16 U Bolts
ASTM A193 B16 Bolts Specification
| Standards | Designation |
|---|---|
| B16 Studs | A193 B16: Class 1 Stainless Steel, AISI 304, Carbide Solution Treated. |
| Studs Dimensions | ASME B18.2.1, B18.3 |
| Melt Origin | Soutd 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 |
| Studs 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 |
Chemical Composition of ASTM A193 Grade B16 Fasteners
| Property class | C. | Mn. | Si. | P. | S. | Cr. | Ni. | Mo. | V. | Ti. |
|---|---|---|---|---|---|---|---|---|---|---|
| B16 | 0.36—0.47 | 0.45—0.70 | 0.15—0.35 | 0.035 max. | 0.04 max. | 0.80—1.15 | — | 0.50-0.65 | 0.25-0.35 | — |
ASTM A193 Grade B16 Mechanical Properties (Inch Product)
| Class | Diameter, [Inch] | Minimum Tempering Temperature, °C | Tensile Strength, min, MPa | Yield Strength, min, 0.2 % offset, MPa | Elongation in 4D, min, % | Reduction of Area, min, % | Hardness, max |
|---|---|---|---|---|---|---|---|
| B16AChromium-molybdenum | 21⁄2 and under | 1200 | 125 | 105 | 18 | 50 | 321 HB or 35 HRC |
| over 21⁄2 to 4 | 1200 | 110 | 95 | 17 | 45 | 321 HB or 35 HRC | |
| over 4 to 8 | 1200 | 100 | 85 | 16 | 45 | 321 HB or 35 HRC |
ASTM A193 Grade B16 Equivalent Grades
| SEN 10269 Grade 40CrMoV4-6 | ASTM A437 Grade B4D |
| NORM M3120 Grade 40CrMoV47 | JIS G4107 Grade SNB16 |
| DIN 17240 Grade 40CrMoV47 | BS Grade 1506Ö |
| JIS G4108 Grade SNB21-1 | UNS Grade K14072 |
| ISO TR Grade 4956 | ASTM A193 Grade B16 |
| JIS G4108 Grade SNB21-3 | JIS G4108 Grade SNB21-2 |
| AISI B16 | JIS G4108 Grade SNB21-4 |
| JIS G4108 Grade SNB21-5 |
ASTM A193 Grade B16 Torque Chart
| Nominal Diameter | Clamp Load (lbs) |
Threads per Inch |
Tightening Torque | |||||
|---|---|---|---|---|---|---|---|---|
| K = 0.15 | K = 0.20 | K = 0.12 | ||||||
| 1/4″ | 2864 | 28 Inch | 107 | in-lbs | 143 | in-lbs | 86 | in-lbs |
| 5/16″ | 4573 | 24 Inch | 214 | 286 | 171 | |||
| 3/8″ | 6916 | 24 Inch | 32 | ft-lbs | 43 | ft-lbs | 26 | ft-lbs |
| 7/16″ | 9349 | 20 Inch | 51 | 68 | 41 | |||
| 1/2″ | 12596 | 20 Inch | 79 | 105 | 63 | |||
| 9/16″ | 15985 | 18 Inch | 112 | 150 | 90 | |||
| 5/8″ | 20157 | 18 Inch | 157 | 210 | 126 | |||
| 3/4″ | 29371 | 16 Inch | 275 | 367 | 220 | |||
| 7/8″ | 40121 | 14 Inch | 439 | 585 | 351 | |||
| 1″ | 53541 | 14 Inch | 669 | 892 | 535 | |||
| 1 1/4″ | 84494 | 12 Inch | 1320 | 1760 | 1056 | |||
| 1 3/8″ | 103534 | 12 Inch | 1779 | 2373 | 1424 | |||
| 1 1/2″ | 124506 | 12 Inch | 2334 | 3113 | 1868 | |||
Dimension of SA193 B16 Stud Bolts
| Diameter (D) | Body Diameter (D) | Across the Flats (F) | Across the Corners © | Head Height (H) | Thread Lengths (T) | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| MAX | MIN | MAX | MIN | MAX | MIN | MAX | MIN | < 6” | > 6” | |
| 1 3/4 | 1.785 | 1.716 | 2.75 | 2.662 | 3.175 | 3.035 | 1.196 | 1.054 | 3.75 | 4 |
| 1/2 | 0.515 | 0.482 | 0.875 | 0.85 | 1.01 | 0.969 | 0.364 | 0.302 | 1.25 | 1.5 |
| 5/8 | 0.642 | 0.605 | 1.062 | 1.031 | 1.227 | 1.175 | 0.444 | 0.378 | 1.5 | 1.75 |
| 1 1/4 | 1.277 | 1.223 | 2 | 1.938 | 2.309 | 2.209 | 0.876 | 0.749 | 2.75 | 3 |
| 3/4 | 0.768 | 0.729 | 1.25 | 1.212 | 1.443 | 1.383 | 0.524 | 0.455 | 1.75 | 2 |
| 7/8 | 0.895 | 0.852 | 1.438 | 1.394 | 1.66 | 1.589 | 0.604 | 0.531 | 2 | 2.25 |
| 1 | 1.022 | 0.976 | 1.625 | 1.575 | 1.876 | 1.796 | 0.7 | 0.591 | 2.25 | 2.5 |
| 1 1/8 | 1.149 | 1.098 | 1.812 | 1.756 | 2.093 | 2.002 | 0.78 | 0.658 | 2.5 | 2.75 |
| 1 3/8 | 1.404 | 1.345 | 2.188 | 2.119 | 2.526 | 2.416 | 0.94 | 0.81 | 3 | 3.25 |
| 1 1/2 | 1.531 | 1.47 | 2.375 | 2.3 | 2.742 | 2.622 | 1.036 | 0.902 | 3.25 | 3.5 |
| 2 | 2.039 | 1.964 | 3.125 | 3.025 | 3.608 | 3.449 | 1.388 | 1.175 | 4.25 | 4.5 |
| 2 1/4 | 2.305 | 2.214 | 3.5 | 3.388 | 4.041 | 3.862 | 1.548 | 1.327 | 4.75 | 5 |
| 2 1/2 | 2.559 | 2.461 | 3.875 | 3.75 | 4.474 | 4.275 | 1.708 | 1.479 | 5.25 | 5.5 |
| 2 3/4 | 2.827 | 2.711 | 4.25 | 4.112 | 4.907 | 4.688 | 1.869 | 1.632 | 5.75 | 6 |
| 3 | 3.081 | 2.961 | 4.625 | 4.475 | 5.34 | 5.102 | 2.06 | 1.815 | 6.25 | 6. |
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A193 B16 Heavy Hex Bolts Dimensions
| NOMINAL SIZE (D) | BODY DIAMETER | HEAD THICKNEASTM A193 | ACROASTM A193 THE FLATS | ACROASTM A193 CORNERS | ||||
|---|---|---|---|---|---|---|---|---|
| D (MAX) | D (MIN) | H (MAX) | H (MIN) | F (MAX) | F (MIN) | C (MAX) | C (MIN) | |
| m10 | 10.00 | 9.78 | 6.63 | 6.17 | 17.00 | 15.73 | 18.48 | 17.77 |
| m12 | 12.00 | 11.73 | 7.76 | 4.24 | 19.00 | 17.73 | 20.78 | 20.03 |
| m16 | 16.00 | 15.73 | 10.32 | 9.68 | 24.00 | 23.67 | 27.71 | 26.75 |
| m20 | 20.00 | 19.67 | 12.88 | 12.12 | 30.00 | 29.16 | 34.64 | 32.95 |
| m24 | 24.00 | 23.67 | 15.44 | 14.56 | 36.00 | 35.00 | 41.57 | 39.55 |
| m30 | 30.00 | 29.67 | 19.48 | 17.92 | 46.00 | 45.00 | 53.12 | 50.85 |
| m72 | 72.00 | 71.26 | 46.45 | 43.55 | 105.00 | 101.40 | 121.24 | 115.60 |
| m36 | 36.00 | 35.61 | 23.38 | 21.63 | 55.00 | 53.80 | 63.51 | 60.79 |
| m42 | 42.00 | 41.38 | 26.97 | 25.03 | 65.00 | 62.90 | 75.06 | 71.71 |
| m48 | 48.00 | 47.38 | 31.07 | 28.93 | 75.00 | 72.60 | 86.60 | 82.76 |
| m56 | 56.00 | 55.26 | 36.2 | 33.80 | 85.00 | 82.20 | 98.15 | 93.71 |
| m14 | 14.00 | 13.73 | 9.09 | 8.51 | 22.00 | 20.67 | 24.25 | 23.35 |
| m64 | 64.00 | 63.26 | 41.32 | 38.68 | 95.00 | 91.80 | 109.70 | 104.65 |
| m80 | 80.00 | 79.26 | 51.58 | 48.42 | 115.00 | 111.00 | 132.72 | 126.54 |
| m90 | 90.00 | 89.13 | 57.74 | 54.26 | 130.00 | 125.50 | 150.11 | 143.07 |
| m100 | 90.00 | 99.13 | 63.9 | 60.10 | 145.00 | 140.00 | 167.43 | 159.60 |
ASME SA193 Grade B16 Bolt Size Chart
| Nominal Basic | Size or Screw | Body | D Diameter | Head | A Diameter | Head | H Height | $ Head Side Height | J Hex Socket Size | T Key Engagmt | G Wall Thkns | K Chamfer or Radius |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter | Max | Min | Max | Min | Max | Min | Max | Nominal | Min | Min | Max | |
| 0 | 0.0600 | 0.0600 | 0.0568 | 0.096 | 0.091 | 0.060 | 0.057 | 0.054 | 0.050 | 0.025 | 0.020 | 0.003 |
| 1 | 0.0730 | 0.0730 | 0.0695 | 0.118 | 0.112 | 0.073 | 0.070 | 0.066 | 1/16 0.062 | 0.031 | 0.025 | 0.003 |
| 2 | 0.0860 | 0.0860 | 0.0822 | 0.140 | 0.134 | 0.086 | 0.083 | 0.077 | 5/64 0.078 | 0.038 | 0.029 | 0.003 |
| 3 | 0.0990 | 0.0990 | 0.0949 | 0.161 | 0.154 | 0.099 | 0.095 | 0.089 | 5/64 0.078 | 0.044 | 0.034 | 0.003 |
| 4 | 0.1120 | 0.1120 | 0.1075 | 0.183 | 0.176 | 0.112 | 0.108 | 0.101 | 3/32 0.094 | 0.051 | 0.038 | 0.005 |
| 5 | 0.1250 | 0.1250 | 0.1202 | 0.205 | 0.198 | 0.125 | 0.121 | 0.112 | 3/32 0.094 | 0.057 | 0.043 | 0.005 |
| 6 | 0.1380 | 0.1380 | 0.1329 | 0.226 | 0.218 | 0.138 | 0.134 | 0.124 | 7/64 0.109 | 0.064 | 0.047 | 0.005 |
| 8 | 0.1640 | 0.1640 | 0.1585 | 0.270 | 0.262 | 0.164 | 0.159 | 0.148 | 9/64 0.141 | 0.077 | 0.056 | 0.005 |
| 10 | 0.1900 | 0.1900 | 0.1840 | 0.312 | 0.303 | 0.190 | 0.185 | 0.171 | 5/32 0.156 | 0.090 | 0.065 | 0.005 |
| 1/4 | 0.2500 | 0.2500 | 0.2435 | 0.375 | 0.365 | 0.250 | 0.244 | 0.225 | 3/16 0.188 | 0.120 | 0.095 | 0.008 |
| 5/16 | 0.3125 | 0.3125 | 0.3053 | 0.469 | 0.457 | 0.312 | 0.306 | 0.281 | 1/4 0.250 | 0.151 | 0.119 | 0.008 |
| 3/8 | 0.3750 | 0.3750 | 0.3678 | 0.562 | 0.550 | 0.375 | 0.368 | 0.337 | 5/16 0.312 | 0.182 | 0.143 | 0.008 |
| 7/16 | 0.4375 | 0.4375 | 0.4294 | 0.656 | 0.642 | 0.438 | 0.430 | 0.394 | 3/8 0.375 | 0.213 | 0.166 | 0.010 |
| 1/2 | 0.5000 | 0.5000 | 0.4919 | 0.750 | 0.735 | 0.500 | 0.492 | 0.450 | 3/8 0.375 | 0.245 | 0.190 | 0.010 |
| 5/8 | 0.6250 | 0.6250 | 0.6163 | 0.938 | 0.921 | 0.625 | 0.616 | 0.562 | 1/2 0.500 | 0.307 | 0.238 | 0.010 |
| 3/4 | 0.7500 | 0.7500 | 0.7406 | 1.125 | 1.107 | 0.750 | 0.740 | 0.675 | 5/8 0.625 | 0.370 | 0.285 | 0.010 |
| 7/8 | 0.8750 | 0.8750 | 0.8647 | 1.312 | 1.293 | 0.875 | 0.864 | 0.787 | 3/4 0.750 | 0.432 | 0.333 | 0.015 |
| 1 | 1.0000 | 1.0000 | 0.9886 | 1.500 | 1.479 | 1.000 | 0.988 | 0.900 | 3/4 0.750 | 0.495 | 0.380 | 0.015 |
| See Notes | 1 | 2,15 | 3 | 4 | 21 | 6 |
ASTM A193 B16 Studs Bolts Hardness Chart
| Studs 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 |
|---|---|---|---|---|---|---|---|
| B16 Studs | 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 1C and 1D: B8S | ALL | 95 | 50 | 35 | 55 | 271 | C28 |
ASTM A193 B16 Bolts Inventory
ASTM A193 B16 Bolts
ASTM A193 B16 Stud Bolts
ASTM A193 B16 Hex Bolts
Applications of ASTM A193 B16 Bolts
- Oil and Gas
- Power Generation
- Petrochemical & Refineries
- Valves & Pumps
- Heavy Engineering
Related Products
FAQ’s About ASTM A193 B16 Bolts
What is A193 gr B16 material?
ASTM A193 B16 is a high-tensile, heat-treated Chromium-Molybdenum-Vanadium (Cr-Mo-V) alloy steel. It is a bolting specification specifically engineered for high-pressure and high-temperature service, retaining its strength and resisting creep at temperatures up to 1000°F (540°C).
What is ASTM A193 B16 equivalent to?
ASTM A193 B16 is best understood as a higher-temperature alternative to Grade B7, rather than a direct equivalent.
What is the difference between B16 and B7 bolts?
The primary difference is the material composition. While both are chromium-molybdenum based, A193 B16 contains added Vanadium. This key difference gives B16 superior strength and reliability at the very high temperatures where Grade B7 would begin to lose its mechanical properties.
What is the hardness of astm A193 Grade B16?
The maximum allowable hardness for an A193 Grade B16 fastener is 35 on the Rockwell C scale (35 HRC). This ensures the material maintains the proper balance of strength and ductility.
Is B16 stronger than B7?
At room temperature, their minimum strength requirements are very similar. However, B16 is considered functionally stronger because it retains its strength at much higher temperatures (up to 1000°F / 540°C). This makes it the superior choice for critical applications like steam turbines and high-heat pressure vessels.
What is the yield strength of a B16 bolt?
For diameters up to 2.5 inches, an ASTM A193 B16 bolt has a minimum yield strength of 105,000 psi (105 ksi or 725 MPa). This high yield strength ensures the bolt can withstand extreme loads without permanent deformation.
