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Our top-of-the-line A193 B7M Black Stud Bolt designed specifically for the rigorous demands of the petrochemical industry. This ANSI B18.2.1 compliant stud bolt is manufactured to the highest standards, ensuring exceptional performance and reliability in the harshest environments. The A193 B7M material composition, coupled with the ASME standard adherence, guarantees superior strength and corrosion resistance, making it the ideal choice for critical applications where safety and durability are paramount.
Crafted in sizes ranging from 1/2 to 4 inches, this stud bolt boasts a performance class of 10.9, providing a robust fastening solution capable of withstanding extreme pressures and temperatures. With a strength of extension reaching 690 MPa and an elongation rate of 186%, the stud bolt delivers unmatched durability and flexibility, essential for maintaining the structural integrity of your equipment.
ASTM A193 Stud Bolts: Chemical Composition
| Physical Element |
ASTM A193 grade B7/M (AISI 4140) |
ASTM A193 grade B8 (AISI 304) |
ASTM A193 grade B8M (AISI 316) |
| Carbon |
0.38 - 0.48% |
0.08% max |
0.08% max |
| Manganese |
0.75 - 1.00% |
2.00% max |
2.00% max |
| Phosphorus, max |
0.035% |
0.045% |
0.045% |
| Sulfur, max |
0.040% |
0.030% |
0.030% |
| Silicon |
0.15 - 0.35% |
1.00% max |
1.00% max |
| Chromium |
0.80 - 1.10% |
18.0 - 20.0% |
16.0 - 18.0% |
| Nickel |
absent |
8.0 - 11.0% |
10.0 - 14.0% |
| Molybdenum |
0.15 - 0.25% |
absent |
2.00 - 3.00% |
ASTM A193 Stud Bolts: Mechanical Properties
| ASTM A193 |
Size |
Min Tensile Strength (KSI) |
Min Yield Strength (KSI) |
Min Elongation (%) |
RA % min |
Max HBW |
Max HRC |
| ASTM A193 grade B7/M |
Up to 2-1/2 |
125 |
105 |
16 |
50 |
321 |
35 |
| 2-5/8 - 4 |
115 |
95 |
16 |
50 |
| 4-1/8 - 7 |
100 |
75 |
18 |
50 |
| ASTM A193 grade B8 Class 1 |
All |
75 |
30 |
30 |
50 |
223 |
35 |
| ASTM A193 grade B8M Class 1 |
All |
75 |
30 |
30 |
50 |
223 |
96 |
| ASTM A193 grade B8 Class 2 |
Up to 3/4 |
125 |
100 |
12 |
35 |
321 |
35 |
| 7/8 - 1 |
115 |
80 |
15 |
35 |
| 1-1/8 - 1-1/4 |
105 |
65 |
20 |
35 |
| 1-3/8 - 1-1/2 |
100 |
50 |
28 |
45 |
| ASTM A193 grade B8M Class 2 |
Up to 3/4 |
110 |
95 |
15 |
45 |
321 |
35 |
| 7/8 - 1 |
100 |
80 |
20 |
45 |
| 1-1/8 - 1-1/4 |
95 |
65 |
25 |
45 |
| 1-3/8 - 1-1/2 |
90 |
50 |
30 |
45 |
The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:
| |
TEMPERATURE °C ( °F ) |
| STUD BOLTS MATERIALS |
MIN. |
MAX. |
| CARBON STEEL |
-29 (-20) |
300 (572) |
| A193 B7/M, L7 |
-73 (-100) |
400 (752) |
| A193 B6 |
0 (32) |
500 (932) |
| A193 B8 |
-200 (-325) |
575 (1067) |
| A193 B16 |
0 (32) |
520 (968) |
| A193 B17B |
-29 (-20) |
650 (1202) |
| A913 Inconel 718 |
0 (32) |
750 (1382) |
| A453 Gr. 660 |
-29 (20) |
538 (1000) |
ASTM A453 Stud Bolts for High-Temp. Service
ASTM A320 Stud Bolts for Low-Temp. Service
The black-coated surface finish not only enhances the aesthetic appeal of the stud bolt but also provides an additional layer of protection against corrosion, ensuring long-term reliability and performance. Whether it's securing flanges, valves, or other critical components in petrochemical plants, this stud bolt offers the strength and resilience needed to withstand the challenging conditions common in industrial settings.
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