Patriot Bolt machines ASTM A193 Grade B5 fasteners from certified 5Cr-1/2Mo steel (AISI 501, UNS S50100). B5 is the bolting match for P5 piping and flanges in hot, sulfur-bearing refinery service.
This page brings together the B5 fasteners we make, the B5 property limits, and how B5 compares with other alloy steel bolting grades.
A193 B5 at a Glance
- Specification
- ASTM A193 / ASME SA193 Grade B5
- Material
- AISI 501, 5Cr-1/2Mo, UNS S50100
- Strength
- 100 ksi min tensile, 80 ksi min yield (4 in and under)
- Service
- Typically up to about 1100 °F
- Matching nut
- A194 Grade 3
- Products
- Stud bolts, heavy hex bolts, nuts
A193 B5 Fasteners We Machine
Choose a product to see its standards and options. Every order ships with mill test reports traceable to the heat.
A193 B5 Stud BoltsFull B5 page
A194 Grade 3 Heavy Hex NutsMatching nut
B5 Heavy Hex BoltsMade in B5A193 B5 Mechanical Properties
| Diameter | Tensile, min | Yield (0.2%), min | Elongation, min |
|---|---|---|---|
| 4 in and under | 100 ksi | 80 ksi | 16% |
Full chemistry is on the A193 B5 stud bolts page.
B5 vs. Other Alloy Steel Bolting Grades
| Grade | Strength (to 2-1/2 in) | Typical use |
|---|---|---|
| A193 B5 | 100 ksi / 80 ksi | Hot, sulfur-bearing refinery service; matches P5 piping |
| A193 B16 | 125 ksi / 105 ksi | Steam and hot service to about 1100 °F |
| A193 B7 | 125 ksi tensile / 105 ksi yield | General flange bolting to about 800 °F |
Compare all grades in the Fastener Materials Matrix.
A193 B5 Fastener FAQ
What is A193 B5 used for?
Hot, sulfur-bearing refinery service and flanges on 5Cr-1/2Mo piping, typically up to about 1100 °F.
Which B5 fasteners does Patriot Bolt make?
We machine B5 stud bolts, heavy hex bolts and nuts, as well as custom parts made to your drawing.
Which nut goes with B5?
A194 Grade 3 heavy hex nuts, the 5Cr-Mo nut grade.
Do B5 fasteners come with certifications?
Yes. Patriot Bolt is ISO 9001:2015 certified, and every B5 order includes mill test reports traceable to the heat and a certificate of conformance to your purchase order.
Request a Quote
Send us the product, size, specification and quantity, or upload your drawing. Call (281) 581-0176 or request a quote.