ASTM A193 Grade B8 Stud Bolts&A194 Grade 8 hex nuts
China ASTM A193 Grade B8 Stud Bolts manufacturer
ASTM A193 Grade B8 Stud Bolts are made of high strength 304 stainless steel materials and manufactured and tested under standard ASTM A193. Both metric and Imperial size are available.
What is ASTM A193 B8 grade material?
the grade symbol “B8”,B refers to the Bolt material. 8 means the nickel content 8% in the composition.
So we can understand that,B8 refers to SS304 stud bolt.
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Material:
- ASTM A193 B8 bolts are manufactured from Type 304 stainless steel (austenitic grade).
- They are non-magnetic and highly resistant to corrosion.
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Mechanical Properties:
- Tensile Strength: Typically 75 ksi (minimum).
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Yield Strength: Minimum 30 ksi.
ASTM A193 Grade B8 Stud bolt thread specification
Threads shall be Unified inch coarse thread series (UNC), Class 2A, for all stud bolt sizes 1 in. and smaller, and Unified inch 8 thread series (8 UN), Class 2A, for all stud bolts larger than 1 in., in accordance with ANSI/ASME B1.1. Acceptability of screw threads shall be determined based on ANSI/ASME B1.3.
UNC Thread Table (Common Sizes):
| Nominal Diameter (in) | Threads Per Inch (TPI) | Major Diameter (in) | Minor Diameter (in) (approx.) | Tap Drill Size (in) |
|---|---|---|---|---|
| 1/4″ | 20 | 0.250 | ~0.188 | #7 (0.201) |
| 5/16″ | 18 | 0.313 | ~0.246 | F (0.257) |
| 3/8″ | 16 | 0.375 | ~0.297 | 5/16 (0.3125) |
| 7/16″ | 14 | 0.438 | ~0.348 | U (0.368) |
| 1/2″ | 13 | 0.500 | ~0.405 | 27/64 (0.4219) |
| 9/16″ | 12 | 0.563 | ~0.460 | 31/64 (0.4844) |
| 5/8″ | 11 | 0.625 | ~0.516 | 17/32 (0.5312) |
| 3/4″ | 10 | 0.750 | ~0.609 | 5/8 (0.625) |
| 7/8″ | 9 | 0.875 | ~0.708 | 49/64 (0.7656) |
| 1″ | 8 | 1.000 | ~0.813 | 7/8 (0.875) |
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 Stud bolt CHEMICAL COMPOSTION
| IDENTIFICATION | B8, B8A | B8C, B8CA | ||
|---|---|---|---|---|
| Grade | Unstabilized 18 chromium – 8 Nickel (Type 304 Stainless) | Stabilized 18 Chromium- 8 Nickel (Type 347 Stainless) | ||
| Element | Range | Tolerance +/- | Range | Tolerance +/- |
| Carbon, max | 0.08 | 0.01 over | 0.08 | 0.01 over |
| Manganese, max | 2.00 | 0.04 over | 2.00 | 0.04 over |
| Phosphorus, max | 0.045 | 0.010 over | 0.045 | 0.010 over |
| Sulfur, max | 0.030 | 0.005 over | 0.030 | 0.005 over |
| Silicon | 1.00 | 0.05 over | 1.00 | 0.05 over |
| Chromium | 18.00 – 20.00 | 0.20 | 17.00 – 19.00 | 0.20 |
| Nickel | 8.00 – 10.50 | 0.15 | 9.00 – 13.00 | 0.15 |
| Molybdenum | – | |||
| Columbium + Tantalum | – | 10x carbon, min | 0.05 under |
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.
ASTM A193 Grade B8 Stud Bolts order specification.
EXAMPLE #1 Stud bolt full Thread, SS304, 7/8″ -9UNC x 100, ASTM A193 -Gr.B8
Stud bolt full Thread, SS304, 1″ -8UN x 100, ASTM A193 -Gr.B8
