India's first-ever manufacturer and supplier of ASTM A193 Grade B7 hex bolts and studs, view torque chart

The ASTM A193 B7 material can be described as a bolting specification for applications taking place at medium to high temperatures. The ASTM A193 Grade B7m Bolts material is basically a chromium molybdenum steel, which can be heat treated. The ASTM A193 Grade B7 Bolts are perfect for applications that take place up to the temperature of 450 degrees C.
The grade b7 stud bolts possess high tensile strength, and they are particularly used in high temperature and high pressure applications. The gr b7 hex bolt can also be found in some special purpose applications. The sa 193 gr b7 material is quenched and tempered so as to develop some desired mechanical properties. Due to all these properties, the astm a193 b7 threaded rod can be found in construction projects, and they are quite easily available in the market. The sa193 gr b7 products are also used in pipe flange connections.
The A193 B7 Bolts are available in different types of finishes, like hot-dip galvanized, Xylan coated, and various other coatings. The surface finishes of the ASTM A193 B7m Bolts are customized as per the requirements of the application. However, it is to be noted that the coated A193-B7 Stud Bolts might not be capable of withstanding high temperatures like that of the uncoated bolts.
There are also other variants of the grade A193 B7 Bolts Material available, like the B7M grade. It has similar chemical properties like that of the ASTM A193 B7 Metric Bolts, but it comes with lower strength requirements and all-round hardness testing.
The ASTM A193 B7 Stud Bolts are heavily used in chemical construction and petroleum industries. The ASTM A193 B7 Heavy Hex Bolts are also used in high temperature and high pressure services, like in pressure vessels, valves, flanges, etc. The ASTM A193 B7 Hex Bolts come with a hex head design and they are driven by a wrench.
The ASTM A193 Grade B7 Bolts are built according to the requirements of a wide range of specifications and material design properties. The ASTM A193 Grade B7 Stud Bolts basically gain their strength from the heat-treating process, and they are always in demand due to their excellent heat resistance properties. The shape, size, and dimensions of the ASTM A193 B7 Fasteners can be customized as per the specific requirements given by the client.
Description | Price |
A193 B7 B7m PTFE Stud Bolts | US $ 0.1 / Piece |
ASTM A193-B7 Stud Bolt and Nuts | US $ 0.01-1 / Piece |
ASTM A193 B7 Stud Bolts Black | US $ 1-1.2 / kg |
A193 B7 Stainless Steel Carriage Stud Nuts and Bolts | US $ 0.01 / Piece |
Fastener PTFE A193 B7 Stud Bolt with Heavy Hex Nut | US $ 0.019-0.023 / Piece |
PTFE Fluorocarbon Coated A193 B7 Allen Screws Hex Bolts with 2h Nuts | US $ 0.068-0.12 / Piece |
Black Oxide ASTM A193 B7 B7m Stud Bolt | US $ 0.1-5 / Piece |
A193 B7 Square Head T Bolt | US $ 1-2 / Piece |
ASTM A193 Gr B7 Half Thread Bolt with Internal Thread | US $ 800-1200 / Ton |
Melt Origin | East Europe/South America/JapanKorea |
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Dimensions | ASME B18.3, B18.2.1 |
ASME/ ANSI | ANSI B18.2.1, B18.3, DIN 931/ 933 |
Hex Nut (DIAMETER) |
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Hex Bolt Inch Size |
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Hex Bolt Metric Size |
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Stud Metric Size |
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Bolts Metric Size |
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Studs Inch sizes |
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Plain Washer (DIAMETER) |
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Metric Sizes
Min Tempering Temperature, °C | Diameter mm | Hardness, max |
593 | over M64 to M100 | 321 HBW or 35 HRC |
593 | M64 and Under | 321 HBW or 35 HRC |
593 | over M100 to M180 | 321 HBW or 35 HRC |
Inch Sizes
Min Tempering Temperature, °C | Diameter Inch | Hardness, max |
1100 | over 2.5 to 4 | 321 HBW or 35 HRC |
1100 | 2.5 and under | 321 HBW or 35 HRC |
1100 | over 4 to 7 | 321 HBW or 35 HRC |
We offer these bolts in the following materials:
- Plated
- Plain
- Coated
Order ASME SA 193 Gr b7 Threaded Rod in accordance with metric and American standards. check weight chart

ASTM A193 Grade B7 Bolts

Grade B7 Stud Bolts

ASTM A193 B7m Bolts

Astm A193 B7 Threaded Rod

Gr B7 Hex Bolt

ASTM A193 B7 Fasteners

ASTM A193 B7 Heavy Hex Bolts

A193 B7 Metric Bolts
Mumbai-based distributor of ASTM A193 B7m Bolts in Metric and Imperial (BSF, BSW, UNC, BA, and UNF) thread forms

Threaded Rod Weight per metre | Threaded Rod Thread | Threaded Rod Strength | |||
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Threaded Rod Class 70 | Threaded Rod Class 80 | ||||
UTS | 0.2% proof | UTS | 0.2% proof | ||
Kg/m | kN | kN | kN | kN | |
3.83 | M27 | 321.3 | 206.6 | 367.2 | 275.4 |
1.31 | M16 | 109.9 | 70.7 | 125.6 | 94.2 |
2.05 | M20 | 171.5 | 110.3 | 196.0 | 147.0 |
0.72 | M12 | 64.0 | 41.0 | 73.0 | 54.0 |
2.96 | M24 | 247.1 | 158.9 | 282.4 | 211.8 |
14.65 | M52 | 1230.6 | 791.1 | 1406.4 | 1054.8 |
6.84 | M36 | 571.9 | 367.7 | 653.6 | 490.2 |
4.70 | M30 | 392.7 | 252.6 | 448.8 | 336.6 |
8.14 | M39 | 683.2 | 439.2 | 780.8 | 585.6 |
5.78 | M33 | 485.8 | 312.3 | 555.2 | 416.4 |
9.38 | M42 | 784.7 | 504.5 | 896.6 | 672.6 |
10.90 | M45 | 914.2 | 587.7 | 1044.8 | 783.6 |
12.32 | M48 | 1031.1 | 662.9 | 1178.4 | 883.8 |
B7 | our Logo & "B7" Grade Marking |
- Epoxy Coatings - Thermal cure
- Molybdenum Disulfide
- Phosphate coating - Manganese and Zinc
- Flouropolymer coatings - Xylan and Teflon
We have a large supply of A193 B7 Bolts Material on hand, and we can help you save money by offering B7 Heavy Hex Bolts in the right size at a lower price.

NOMINAL SIZE (D) | ACRO ASTM A479 THE FLATS | HEAD THICKNE ASTM A479 | BODY DIA. | ACRO ASTM A479 CORNERS | ||||
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F (MAX) | F (MIN) | H (MAX) | H (MIN) | D (MAX) | D (MIN) | C (MAX) | C (MIN) | |
m20 | 30.00 | 29.16 | 12.88 | 12.12 | 20.00 | 19.67 | 34.64 | 32.95 |
m12 | 19.00 | 17.73 | 7.76 | 4.24 | 12.00 | 11.73 | 20.78 | 20.03 |
m14 | 22.00 | 20.67 | 9.09 | 8.51 | 14.00 | 13.73 | 24.25 | 23.35 |
m10 | 17.00 | 15.73 | 6.63 | 6.17 | 10.00 | 9.78 | 18.48 | 17.77 |
m16 | 24.00 | 23.67 | 10.32 | 9.68 | 16.00 | 15.73 | 27.71 | 26.75 |
m30 | 46.00 | 45.00 | 19.48 | 17.92 | 30.00 | 29.67 | 53.12 | 50.85 |
m24 | 36.00 | 35.00 | 15.44 | 14.56 | 24.00 | 23.67 | 41.57 | 39.55 |
m100 | 145.00 | 140.00 | 63.9 | 60.10 | 90.00 | 99.13 | 167.43 | 159.60 |
m36 | 55.00 | 53.80 | 23.38 | 21.63 | 36.00 | 35.61 | 63.51 | 60.79 |
m48 | 75.00 | 72.60 | 31.07 | 28.93 | 48.00 | 47.38 | 86.60 | 82.76 |
m56 | 85.00 | 82.20 | 36.2 | 33.80 | 56.00 | 55.26 | 98.15 | 93.71 |
m42 | 65.00 | 62.90 | 26.97 | 25.03 | 42.00 | 41.38 | 75.06 | 71.71 |
m64 | 95.00 | 91.80 | 41.32 | 38.68 | 64.00 | 63.26 | 109.70 | 104.65 |
m80 | 115.00 | 111.00 | 51.58 | 48.42 | 80.00 | 79.26 | 132.72 | 126.54 |
m72 | 105.00 | 101.40 | 46.45 | 43.55 | 72.00 | 71.26 | 121.24 | 115.60 |
m90 | 130.00 | 125.50 | 57.74 | 54.26 | 90.00 | 89.13 | 150.11 | 143.07 |
Chemical Composition B7 VS L7
Element | L7 (AISI 4140) | B7 (AISI 4140) |
Manganese | 0.65 - 1.10% | 0.65 - 1.10% |
Carbon | 0.37 - 0.49% | 0.37 - 0.49% |
Sulfur, max | 0.040% | 0.040% |
Molybdenum | 0.15 - 0.25% | 0.15 - 0.25% |
Phosphorus, max | 0.035% | 0.035% |
Chromium | 0.75 - 1.20% | 0.75 - 1.20% |
Silicon | 0.15 - 0.35% | 0.15 - 0.35% |
Nickel |
Mechanical Properties B7 VS L7
Grade | Size | RA % min | Yield, ksi, min | Tensile ksi, min | Elong, %, min |
B7 | Up to 2-1/2 | 50 | 105 | 125 | 16 |
L7 | Up to 2-1/2 | 50 | 105 | 125 | 16 |
Proof load (Lbs) | Bolt Sizes | Threads Per Inch< | Clamp load (Lbs) | torqueTightening (Ft Lbs) | ||
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Galv | Galv+Waxed | Plain | ||||
3,350 | 1/4 | 20 | 2,513 | 13 | 5 | 10 |
5,500 | 5/16 | 18 | 4,125 | 27 | 11 | 21 |
8,150 | 3/8 | 16 | 6,113 | 48 | 19 | 38 |
11,150 | 7/16 | 14 | 8,363 | 76 | 30 | 61 |
14,900 | 1/2 | 13 | 11,175 | 116 | 47 | 93 |
19,100 | 9/16 | 12 | 14,325 | 168 | 67 | 134 |
23,750 | 5/8 | 11 | 17,813 | 232 | 93 | 186 |
35,050 | 3/4 | 10 | 26,288 | 411 | 164 | 329 |
48,500 | 7/8 | 9 | 36,375 | 663 | 265 | 530 |
63,650 | 1 | 8 | 47,738 | 995 | 398 | 796 |
80,100 | 11/8 | 7 | 60,075 | 1,408 | 563 | 1,126 |
82,934 | 11/8 | 8 | 62,201 | 1,458 | 583 | 1,166 |
101,750 | 11/4 | 7 | 76,313 | 1,987 | 795 | 1,590 |
105,006 | 11/4 | 8 | 78,754 | 2,051 | 820 | 1,641 |
121,300 | 13/8 | 6 | 90,975 | 2,606 | 1,042 | 2,085 |
129,492 | 13/8 | 8 | 97,119 | 2,782 | 1,113 | 2,226 |
147,550 | 11/2 | 6 | 110,663 | 3,458 | 1,383 | 2,767 |
156,687 | 11/2 | 8 | 117,515 | 3,672 | 1,469 | 2,938 |
199,500 | 13/4 | 5 | 149,625 | 5,455 | 2,182 | 4,364 |
218,400 | 13/4 | 8 | 163,800 | - | - | 4,778 |
262,500 | 2 | 41/2 | 196,875 | 8,203 | 3,281 | 6,563 |
290,850 | 2 | 8 | 218,138 | - | - | 7,271 |
341,250 | 21/4 | 41/2 | 255,938 | 11,997 | 4,799 | 9,598 |
373,801 | 21/4 | 8 | 280,351 | - | - | 10,513 |
420,000 | 21/2 | 4 | 315,000 | 16,406 | 6,563 | 13,125 |
466,200 | 21/2 | 8 | 349,650 | - | - | 14,569 |
468,500 | 23/4 | 4 | 351,263 | 20,124 | 8,050 | 16,100 |
515,851 | 23/4 | 8 | 386,888 | - | - | 17,732 |
567,150 | 3 | 4 | 425,363 | 26,585 | 10,634 | 21,268 |
618,451 | 3 | 8 | 463,838 | - | - | 23,192 |
674,500 | 31/4 | 4 | 505,875 | 34,252 | 13,701 | 27,402 |
730,550 | 31/4 | 8 | 547,913 | - | - | 29,679 |
791,350 | 31/2 | 4 | 593,513 | 43,277 | 17,311 | 34,622 |
851,201 | 31/2 | 8 | 638,401 | - | - | 37,240 |
917700 | 33/4 | 4 | 688275 | 53,771 | 21,509 | 43,017 |
982,300 | 33/4 | 8 | 736,725 | - | - | 46,045 |
1052600 | 4 | 4 | 789450 | 65,788 | 26,315 | 52,630 |
1,121,950 | 4 | 8 | 841,463 | - | - | 56,098 |
Specification of Nut | Specification Of Washer |
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ASTM A194 Grade 2HM OR ASTM A194 Grade 2H | ASTM F436 |
A reputable exporter of ASTM A193 B7 fasteners is sought after by numerous petrochemical, oil, and gas firms.

Stud bolt sizes | Studs length | ||||||
Nominal pipe size | No. of Bolts | Bolt Circle dia. | OD of Flange | Bolt Holes dia. | Bolts dia. | Ring Joint | 0.06 in Raised Face |
3/4 | 4 | 2 3/4 | 3 7/8 | 5/8 | 1/2 | – | 2 1/2 |
1 1/4 | 4 | 3 1/2 | 4 5/8 | 5/8 | 1/2 | 3 1/4 | 2 3/4 |
1/2 | 4 | 2 3/8 | 3 1/2 | 5/8 | 1/2 | – | 2 1/4 |
1 1/2 | 4 | 3 7/8 | 5 | 5/8 | 1/2 | 3 1/4 | 2 3/4 |
2 | 4 | 4 3/4 | 6 | 3/4 | 5/8 | 3 3/4 | 3 1/4 |
1 | 4 | 3 1/8 | 4 1/4 | 5/8 | 1/2 | 3 | 2 1/2 |
2 1/2 | 4 | 5 1/2 | 7 | 3/4 | 5/8 | 4 | 3 1/2 |
3 1/2 | 8 | 7 | 8 1/2 | 3/4 | 5/8 | 4 | 3 1/2 |
4 | 8 | 7 1/2 | 9 | 3/4 | 5/8 | 4 | 3 1/2 |
3 | 4 | 6 | 7 1/2 | 3/4 | 5/8 | 4 | 3 1/2 |
5 | 8 | 8 1/2 | 10 | 7/8 | 3/4 | 4 1/4 | 3 3/4 |
8 | 8 | 11 3/4 | 13 1/2 | 7/8 | 3/4 | 4 3/4 | 4 1/4 |
6 | 8 | 9 1/2 | 11 | 7/8 | 3/4 | 4 1/2 | 4 |
10 | 12 | 14 3/4 | 16 | 1 | 7/8 | 5 | 4 1/2 |
14 | 12 | 18 3/4 | 21 | 1 1/8 | 1 | 5 3/4 | 5 1/4 |
12 | 12 | 17 | 19 | 1 | 7/8 | 5 1/4 | 4 3/4 |
16 | 16 | 21 1/4 | 23 1/2 | 1 1/8 | 1 | 5 3/4 | 5 1/4 |
20 | 20 | 25 | 27 1/2 | 1 1/4 | 1 1/8 | 6 3/4 | 6 1/4 |
18 | 16 | 22 3/4 | 25 | 1 1/4 | 1 1/8 | 6 1/4 | 5 3/4 |
24 | 20 | 29 1/2 | 32 | 1 1/4 | 1 1/4 | 7 1/4 | 6 3/4 |
Diameter, inch. | Hardness, maximum |
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over 2-1⁄2 to 4, inclusive | 321 HBW or 35 HRC |
2-1⁄2 and under | 321 HBW or 35 HRC |
over 4 to 7, inclusive | 321 HBW or 35 HRC |

Diameter* (mm) |
Nut Size (mm) |
Height (mm) |
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Jam Nut | Hex Nut | Nylock Nut | ||
8 | 5 | 2.7 | 4 | 5 |
5 | 2.5 | 1.6 | 2 | - |
5.5 | 3 | 1.8 | 2.4 | 4 |
30 | 20 | 10 | 16 | 20 |
4 | 2 | 1.2 | 1.6 | - |
7 | 4 | 2.2 | 3.2 | 5 |
19 | 12 | 6 | 10 | 12 |
11 | 7 | 3.5 | 5.5 | - |
22 | 14 | 7 | 11 | 14 |
13 | 8 | 4 | 6.5 | 8 |
24 | 16 | 8 | 13 | 16 |
10 | 6 | 3.2 | 5 | 6 |
17 | 10 | 5 | 8 | 10 |
27 | 18 | 9 | 15 | 18.5 |

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Heavy Hex High Strength Structural Bolt ASTM A193 B7
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Element | B7 |
---|---|
Manganese | 0.75 to 1.00% |
Carbon | 0.38 to 0.48% |
Molybdenum | 0.15 to 0.25% |
Phosphorus, max | 0.035% |
Chromium | 0.80 to 1.10% |
Silicon | 0.15 to 0.35% |
Sulfur, maximum | 0.0040% |
Nickel |
Grade | Elong, %, min | Tensile ksi, min | Size | Yield, ksi, min | HBW | RA % min | HRC |
---|---|---|---|---|---|---|---|
B7 | 16 | 125 | Up to 2-1/2 | 105 | 321 max | 50 | 35 max |
16 | 115 | 2-5/8 to 4 | 95 | 50 | |||
18 | 100 | 4-1/8 to 7 | 75 | 50 |
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