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Stud bolts are fully threaded fasteners designed for high-load clamping applications where nuts are required on both ends, commonly used in flanged joints, pressure vessels, pipelines, and structural steel assemblies. Unlike standard bolts with heads, stud bolts provide uniform tensile strength distribution, making them essential in critical fastening systems where vibration, pressure, and thermal expansion are factors.
Manufactured in compliance with standards such as DIN 976, ASTM A193/A193M, ISO 898, and BS specifications, stud bolts are available in a wide range of materials including stainless steel, alloy steel, carbon steel, and high-nickel alloys. These fasteners are widely used across oil & gas, petrochemical, power generation, offshore engineering, and heavy industrial fabrication sectors.
KK Fasteners supplies precision-engineered stud bolts to global industries, ensuring dimensional accuracy, mechanical strength consistency, and full traceability across every production batch.
| Parameter | Specification |
|---|---|
| Material Grades | SS 304, SS 316, SS 316L, Carbon Steel, Alloy Steel (ASTM A193 B7, B7M, B16) |
| Grade Options | 4.6, 8.8, 10.9, 12.9, ASTM A193 Grade B7/B8/B8M |
| Size Range | M6 to M100 / 1/4” to 4” |
| Thread Type | Metric (M), UNC, UNF, BSW |
| Standards | DIN 976, ASTM A193, ASTM A320, ISO 898, BS 3692 |
| Surface Finish | Black Oxide, Hot Dip Galvanized (HDG), PTFE Coated, Zinc Plated |
| Type | Full Thread, Double Ended Stud, Tap End Stud, Reduced Shank Stud |
| Tensile Strength | Up to 1200 MPa (Grade dependent) |
Flange Size |
B16.5 Class 150 RF/ Ring Gaskets |
B16.5 Class 150 FF/ Full Face Gaskets |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Torque / Round (ft-lbs) |
Stud Bolts Tighten Sequence |
Torque / Round (ft-lbs) |
Stud Bolts Tighten Sequence |
|||||||
1st |
2nd |
Final |
Dwg/No. |
Bolt Size |
1st |
2nd |
Final |
Dwg*/No. |
Bolt Size |
|
1/2″ |
10 |
20 |
30 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
3/4″ |
13 |
27 |
40 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
1″ |
15 |
30 |
50 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
1-1/4″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
1-1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
20 |
40 |
60 |
4-bolt |
1/2″ |
2″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
2-1/2″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
3″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
40 |
80 |
120 |
4-bolt |
5/8″ |
3-1/2″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
4″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
40 |
80 |
120 |
8-bolt |
5/8″ |
5″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
6″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
8″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
60 |
120 |
200 |
8-bolt |
3/4″ |
10″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
12″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
95 |
190 |
320 |
12-bolt |
7/8″ |
14″ |
147 |
294 |
490 |
12-bolt |
1″ |
147 |
294 |
490 |
12-bolt |
1″ |
16″ |
147 |
294 |
490 |
16-bolt |
1″ |
147 |
294 |
490 |
16-bolt |
1″ |
18″ |
213 |
426 |
710 |
16-bolt |
1-1/8″ |
213 |
426 |
710 |
16-bolt |
1-1/8″ |
20″ |
213 |
426 |
710 |
20-bolt |
1-1/8″ |
213 |
426 |
710 |
20-bolt |
1-1/8″ |
24″ |
300 |
600 |
1,000 |
20-bolt |
1-1/4″ |
300 |
600 |
1,000 |
20-bolt |
1-1/4″ |
| STUD BOLT LENGTH (in inches) | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1 1/8 | 1 1/4 | 1.3/8 | 1 1/2 | 1.5/8 | 1.3/4 | 1 7/8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.1/2 | 10.8 | |||||||||||
| 2.3/4 | 11.6 | 19.8 | ||||||||||
| 3.1/4 | 12.4 | 21 | 32.4 | |||||||||
| 3.1/2 | 13.2 | 22.2 | 34.3 | 50 | ||||||||
| 4 | 14 | 23.4 | 36.2 | 52.6 | 71.8 | |||||||
| 4.1/2 | 14.8 | 24.6 | 38.1 | 55.2 | 75.2 | 102 | ||||||
| 4.3/4 | 15.6 | 25.8 | 40 | 57.8 | 78.6 | 106 | 137 | |||||
| 5 | 16.4 | 27 | 41.9 | 60.4 | 82 | 111 | 142 | 179 | ||||
| 5.1/2 | 17.2 | 28.2 | 43.8 | 63 | 85.4 | 115 | 147 | 186 | 234 | |||
| 6 | 18 | 29.4 | 45.7 | 65.6 | 88.8 | 119 | 153 | 193 | 242 | 289 | ||
| 6.1/4 | 18.8 | 30.6 | 47.6 | 68.2 | 92.2 | 123 | 158 | 200 | 250 | 298 | 263 | |
| 6.1/2 | 19.6 | 32.3 | 49.5 | 70.8 | 95.6 | 128 | 164 | 206 | 258 | 308 | 374 | 437 |
| 7 | 20.4 | 33.5 | 50.8 | 73.4 | 99 | 132 | 169 | 213 | 266 | 317 | 385 | 449 |
| 7.1/2 | 21.2 | 34.8 | 52.7 | 75.5 | 103 | 136 | 174 | 220 | 275 | 326 | 396 | 462 |
| 8 | 22 | 36.1 | 54.5 | 78 | 106 | 141 | 180 | 226 | 283 | 336 | 407 | 475 |
| 8.1/4 | 37.3 | 56.3 | 80.5 | 108 | 145 | 185 | 233 | 291 | 345 | 418 | 488 | |
| 8.3/4 | 38.6 | 58.1 | 83.1 | 112 | 149 | 191 | 240 | 299 | 354 | 429 | 500 | |
| 9 | 39.8 | 60 | 85.6 | 115 | 153 | 196 | 246 | 307 | 364 | 440 | 513 | |
| 9.1/2 | 41.1 | 61.8 | 88.2 | 118 | 158 | 201 | 253 | 316 | 373 | 451 | 526 | |
| 10 | 63.7 | 90.7 | 122 | 162 | 206 | 260 | 324 | 382 | 463 | 538 | ||
| 10/1.4 | 93.3 | 125 | 166 | 212 | 267 | 332 | 391 | 474 | 551 | |||
| 1.0.1/2 | 128 | 171 | 217 | 273 | 340 | 401 | 485 | 564 | ||||
| 11 | 132 | 175 | 223 | 279 | 345 | 410 | 496 | 576 | ||||
| 11.1/2 | 135 | 179 | 228 | 285 | 350 | 419 | 507 | 589 | ||||
| 12 | 138 | 184 | 233 | 292 | 358 | 429 | 518 | 602 |
| Nom Pipe Size (inches) |
Nom Pipe Size (mm) |
Number of bolts |
Dim (inch) x Length (mm) |
|---|---|---|---|
| 1/2 | 15 | 4 | 1/2 x 65 |
| 3/4 | 20 | 4 | 1/2 x 65 |
| 1 | 25 | 4 | 1/2 x 70 |
| 1 1/2 | 40 | 4 | 1/2 x 75 |
| 2 | 50 | 4 | 5/8 x 80 |
| 2 1/2 | 65 | 4 | 5/8 x 90 |
| 3 | 80 | 4 | 5/8 x 95 |
| 4 | 100 | 8 | 5/8 x 95 |
Stud bolts are widely used in industries requiring high-integrity bolting systems where vibration resistance, pressure containment, and structural stability are critical.
Stud bolts are manufactured using precision cold forging and CNC threading processes to ensure uniform grain flow and high mechanical strength. Heat treatment is applied for alloy steel grades to achieve desired hardness and tensile properties. Each batch undergoes strict dimensional inspection using calibrated gauges and optical measurement systems.
Quality control includes hardness testing, tensile strength verification, and thread gauge checks to ensure compliance with ASTM and DIN standards. Surface finishing is validated for coating thickness and adhesion performance. KK Fasteners implements full batch traceability and ISO 9001:2015-certified quality management systems, ensuring every stud bolt meets global industrial safety and performance requirements.
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Stud bolts are fully threaded fasteners without a head, designed to be used with nuts on both ends. They are primarily used in flange joints, pressure vessels, and structural assemblies where high clamping force and uniform load distribution are required.
Common materials include carbon steel (ASTM A193 B7), stainless steel (SS 304/316), and alloy steel. Carbon steel is used for high strength applications, while stainless steel is preferred for corrosion resistance in marine and chemical environments.
Stud bolts are manufactured according to DIN 976, ASTM A193/A320, ISO 898, and BS 3692 standards. These standards define mechanical properties, dimensional tolerances, and material requirements for industrial applications.
Selection depends on load requirements, operating temperature, and environmental exposure. High-pressure systems require alloy steel grades, while corrosive environments require stainless steel variants for durability and safety.
Look for ISO-certified manufacturers with material traceability, compliance with international standards, and proven export experience. Suppliers like KK Fasteners provide documentation support, quality certification, and global logistics capability.
High-performance stud bolts play a critical role in ensuring structural integrity across industrial systems operating under extreme conditions. With precision manufacturing, strict quality control, and global supply capability, KK Fasteners supports engineering teams with reliable fastening solutions tailored to project-specific requirements.
For technical specifications, pricing, or custom manufacturing support, connect with the engineering team at KK Fasteners to request a detailed quotation or datasheet today.
