Hardness testing to ISO 6508-1
A Stainless Steel A4-70 Hex Bolt is a specific type of fastener made from stainless steel alloy known as A4-70. This classification indicates its material composition and mechanical properties.
Here are some key features and characteristics of A4-70 stainless steel hex bolts:
Material Composition: A4-70 stainless steel is primarily composed of iron, chromium, nickel, and molybdenum. This combination of elements imparts excellent corrosion resistance and mechanical strength.
Corrosion Resistance: A4-70 stainless steel is highly resistant to corrosion and rust, making it suitable for use in harsh environments, including marine applications. Its corrosion resistance is a result of the chromium content, which forms a protective oxide layer on the surface of the bolt when exposed to oxygen or moisture.
Mechanical Properties: The "A4-70" designation indicates the bolt's mechanical properties. The "A4" signifies that it is a type of austenitic stainless steel, while the "70" represents its minimum tensile strength in megapascals (MPa). In this case, A4-70 stainless steel typically has a minimum tensile strength of 700 MPa.
Machining: A4-70 stainless steel can be machined, but it is generally more challenging to machine than some other materials due to its hardness. It may require specialized cutting tools and techniques to achieve precise results. However, it is important to note that stainless steel's corrosion resistance can be compromised if the material is overheated during machining.
|Specifications||ASTM A193 / ASME SA193|
|Standard||ISO, ASTM, DIN, JIS, IS, GB, BS, and all International Standards|
|Size||M3 - M100 | 3/6″ - 4″ | Custom Sizes|
|Length||3 mm - 200 mm | Custom Sizes|
|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||UNF, BSW, BSF, METRIC, UNC, or as required|
|Surface Coating||Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request|
|Manufacturing Process||Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing.|
Applications: A4-70 hex bolts find widespread use in various industries and applications, particularly where corrosion resistance and mechanical strength are critical. Some common applications include:
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|A4-70||0.08||1||2||0.045||0.03||16 to 18.5||2 to 3||10 to 15||4|
|Grade||Tensile Strength min. Mpa||Stress at 0.2 % permanent strain Rp0.2a min. Mpa||Elong (% in 4D min)|
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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