China ASTM A193 Grade B8M Stud Bolts manufacturer
We are the professional manufacturer ASTM A193 Grade B8M Stud Bolts&A194 Grade 8M hex nuts in china
ASTM A193 Grade B8M Stud Bolts are high strength 316 stainless steel bolts, coupled with pair of A194-8M nuts for bolting carbon and stainless steel pipelines. Boltport is a manufacturer and supplier of fully threaded, tap end and double end stud bolts in ASTM A193 Grade B8M Class 1, Class 2 & Class 2B specification. We offer b8M stud bolts in both metric and imperial sizes with coarse, fine & extra fine threads. A193 B8M stud bolts & A194 Gr.8M Hex nuts are produced with full compliance to all requirements of ASTM A193 Grade B8M specification and supplied with 3.1 certificate.
ASTM A193 B8M stud bolt, SS316 Stud bolt,SUS316 Stud bolt, B8M stud bolts, B8M heavy hex bolts, and other B8M fasteners are commonly used in marine and other heavy industrial environments that require corrosion resistant fasteners to be used. It is offten incorrectly thought that B8 studs and fasteners (304 stainless) are mechanically weeker than B8M studs and fasteners (316 stainless steel).
and A194 8M Hex Nuts
ASME B18.2.1 Stud Bolt &ASME B18.2.2 hex nuts
A193 B8M Hex Bolt
We also supply A193 B8 Stud bolts and A194 Gr 8 Hex nuts
Both grade can be PTFE COATED
XYLAN/PTFE COATED A193 B8 Stud bolts and A194 Gr 8 Hex nuts
XYLAN/PTFE COATED A193 B8M Stud bolts and A194 Gr 8M Hex nuts
A193 Grades Stud bolts
| B7 | Alloy steel, AISI 4140/4142 quenched and tempered |
|---|---|
| B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
| B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
| B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
| B8M | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
ASTM A193 B8, B8A CHEMICAL COMPOSTION
The specification for ASTM A193 covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. The ASTM A193 specification covers bars, bolts, screws, studs, stud bolts, and wire.
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
|---|---|---|---|---|---|
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
| 2-5/8 – 4 | 115 | 95 | 16 | 50 | |
| 4-1/8 – 7 | 100 | 75 | 18 | 50 | |
| B8 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 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 | |
| B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
| 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 | |
| B16 | Up to 2-1/2 | 125 | 105 | 18 | 50 |
| 2-5/8 – 4 | 110 | 95 | 17 | 45 | |
| 4-1/8 – 7 | 100 | 85 | 16 | 45 |
Material Chemical Composition
A193 B8M Stud bolts Chemical composition
| Element | B7 (AISI 4140) | B8 (AISI 304) | 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 | 8.0 – 11.0% | 10.0 – 14.0% | |
| Molybdenum | 0.15 – 0.25% | 2.00 – 3.00% |
Recommended Nuts,Bolts & Washer
| Bolt Grade | Nuts | Washers |
|---|---|---|
| B7 | A194 Grade 2H | F436 |
| B8 Class 1 | A194 Grade 8 | SS304 |
| B8M Class 1 | A194 Grade 8M | SS316 |
| B8 Class 2 | A194 Grade 8 | SS304 |
| B8M Class 2 | A194 Grade 8M | SS316 |
How to order our A193 B8M Stud Bolts?
EXAMPLE#1,
STUD BOLT , 3/4 X 145 LG ,W/2 HVY HEX NUT; (IMP SIZE X METRIC LG); SS ASTM A193 GR A193 B8M CL 2/ASTM A194 GR 8M Hex nuts