China manufacturer of Metric Threaded stud bolt according to ASME B18.31.1M standard.
ASME B18.31.1M is a standard that defines the dimensions, tolerances, and specifications for metric continuous thread stud Bolt.
Scope of ASME B18.31.1M
- Covers metric continuous thread studs of various lengths.
- Defines the mechanical properties, materials, and marking requirements.
Applications:
- Suitable for use in bolted connections where a threaded stud is required on both ends or throughout its length.
- Commonly used in high-stress environments.
Thread Standards:
- Threads conform to ISO metric screw threads as per ASME B1.13M.
Dimensions and Tolerances
- Stud Length:
- Measured from end to end, excluding the chamfer or point.
- Lengths vary based on application requirements.
- Thread Pitch and Size:
- Defined according to ISO metric thread profiles.
- Threads are specified in terms of pitch diameter, major diameter, and thread length.
- Chamfering and Points:
- Ends of studs may have chamfers or points to facilitate assembly.
Materials for the stud bolt
ASME B18.31.1M does not specify material grades. Instead, the material of the stud bolts must comply with other applicable material standards as below
- ASTM A193: Alloy and stainless steel for high-temperature or high-pressure service.
- ASTM A320: Alloy and stainless steel for low-temperature service.
- ASTM A307: Carbon steel bolts and studs for general use.
Material Grades for Stud Bolts Under ASTM A193
| Grade | Material Type | Typical Applications | Key Features |
|---|---|---|---|
| B7 | Chromium-Molybdenum Alloy Steel | High-temperature and high-pressure service | Strong, heat-treated alloy steel. |
| B7M | Chromium-Molybdenum Alloy Steel | Corrosive environments, lower hardness | Lower hardness and tensile strength. |
| B8 | 304 Stainless Steel | Corrosion resistance, general environments | Austenitic stainless steel with good corrosion resistance. |
| B8M | 316 Stainless Steel | Corrosion resistance, marine environments | Better corrosion resistance than B8. |
| B16 | Chromium-Molybdenum-Vanadium | High-temperature, high-pressure environments | Suitable for elevated temperatures. |
| B6 | Ferritic Stainless Steel (410) | High-strength and moderate corrosion resistance | Hardened ferritic steel for specific uses. |
Material Grades for Stud Bolts Under ASTM A320
| Grade | Material Type | Typical Applications | Key Features |
|---|---|---|---|
| L7 | Chromium-Molybdenum Alloy Steel | Low-temperature pressure systems | Strong, heat-treated alloy steel for low temps. |
| L7M | Chromium-Molybdenum Alloy Steel | Corrosive, low-temperature environments | Reduced hardness for improved toughness. |
| L43 | Nickel-Chromium-Molybdenum Alloy | Extreme low temperatures, critical systems | Excellent toughness and strength at very low temperatures. |
| B8 | 304 Stainless Steel | Corrosion-resistant, low-temperature service | Austenitic stainless steel with good corrosion resistance. |
| B8M | 316 Stainless Steel | Corrosion-resistant, cryogenic applications | Enhanced corrosion resistance, especially in chloride environments. |
| L70 | Low Alloy Steel with Nickel | High strength for low-temperature applications | Good ductility and strength at low temperatures. |
ASME B18.31.1M provides the dimensional and threading framework for continuous thread studs, the material, heat treatment, and mechanical properties of stud bolts must align with standards like ASTM A193, ASTM A320, or other applicable material specifications.
Pls download the standard ASME B18.31.1M if want to know more information
