Hardness testing to ISO 6508-1
Stainless Steel A4-70 Stud Bolts are specialized fasteners designed for applications requiring high corrosion resistance and mechanical strength. The "A4-70" designation signifies the material grade and its mechanical properties. Here are key features, applications, and considerations for these stud bolts:
Material and Grade: Stainless Steel A4-70 Stud Bolts are typically manufactured from AISI 316 stainless steel, which is also known as A4 stainless steel. This grade contains 18% chromium, 10% nickel, and 2-3% molybdenum, providing excellent corrosion resistance, especially in marine and corrosive environments. The "A4-70" designation indicates the material grade and its mechanical properties. The "A4" signifies AISI 316 stainless steel, and the "70" represents the minimum tensile strength, approximately 700 MPa, making these stud bolts suitable for demanding applications.
Design and Function: Stud bolts have threads on both ends, allowing them to be screwed into a threaded hole or fastened with nuts on both ends. They are often used to create a threaded connection between two components, such as flanges, pipes, or machinery parts. The threaded design provides a secure and reliable connection.
Applications: Stainless Steel A4-70 Stud Bolts are commonly used in various industries and applications, particularly in environments where corrosion resistance is crucial. These may include marine applications, chemical processing plants, offshore drilling rigs, and anywhere exposure to saltwater, chemicals, or harsh atmospheric conditions is a concern. Stud bolts provide a durable and corrosion-resistant fastening solution in such settings.
Corrosion Resistance: AISI 316 stainless steel (A4) is known for its outstanding corrosion resistance properties. It is highly resistant to rust, staining, and corrosion when exposed to moisture, saltwater, and various chemicals. This makes A4-70 Stud Bolts suitable for use in aggressive and corrosive environments.
|Specifications||ASTM F738M / ASME SF738M|
|Size||M02 to M160|
|Length||3 to 200 mm|
|Dimensions||DIN 975/976, ASME B18.2.1, B18.31.3, B16.5|
|DIN Standard||B.S. DIN 931, DIN 933, DIN 912, DIN 934, DIN 6923, DIN 603, DIN 7981, DIN 970, DIN916, DIN 7982, DIN 7985, DIN 913|
|UTS||NPT, UNS, UNF, UNC, UNEF, NPTF|
|ISO||ISO 4033, ISO 4032, ISO 7380, ISO 4017, JIS standards|
|Threads||ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads|
|Type||Cold Forged, Hot Forged, Bar Stock Machined, Bar Stock Milling|
Machining and Fabrication: Stainless Steel A4-70 Stud Bolts can be somewhat more challenging to machine compared to lower-grade stainless steels due to their increased hardness. Carbide tooling is often recommended for drilling and cutting. Proper cutting speeds, feeds, and lubrication should be used to prevent overheating and work hardening of the material.
To preserve the high standards of our selection of industrial stud bolts, we have always adhered to a systematic quality management process.
Our staff of experts is vibrant and talented, and they have always been our largest supporters and contributors to our success. Our vision is to create a world of stud bolts.
|Grade||Tensile Stress (MPa) min||Yield Strength
(% in 50mm) min
Rockwell B (HR B) max
|Brinell (HB) max|
|A4-70||700||450||40||Not required||Not required|
Hardness testing to ISO 6508-1
Nut proof load testing to ISO 898-2
Suitability for preloading to EN 14399-2
Calibrated gauges and tools
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