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.

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Stainless Steel A4-70 Hex Bolts
  • ISO

    3506-1

  • Grade

    A4-70

  • ASTM / ASME

    ASTM A193 / SA193

  • SHARE

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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.

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fevicon-logo SS A4-70 Hex Bolts Specification

SpecificationsASTM A193 / ASME SA193
StandardISO, ASTM, DIN, JIS, IS, GB, BS, and all International Standards
DiameterM3 to M100 up to 1000 MM
DIN StandardB.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 CoatingBlack Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request
Manufacturing ProcessWire 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:

  • Marine Industry: Due to its exceptional resistance to saltwater corrosion, A4-70 hex bolts are frequently used in boat building, ship maintenance, and other maritime applications.
  • Construction: They are used in construction projects, especially in outdoor and exposed areas where corrosion can be a concern, such as bridges, outdoor structures, and coastal developments.
  • Chemical Processing: A4-70 hex bolts are employed in chemical processing plants where exposure to corrosive chemicals is a constant threat.
  • Food and Pharmaceutical Industries: These bolts are used in equipment and machinery for their resistance to corrosion and ease of cleaning, which is crucial in these industries.
  • Outdoor Installations: A4-70 stainless steel hex bolts are ideal for outdoor installations like railings, fences, and signage, as they can withstand exposure to the elements without rusting or corroding.


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fevicon-logo Chemical Composition of Stainless Steel A4-70 Hex Bolts

Grade C Si Mn P S Cr Mo Ni Cu
A4-70 0.08 1 2 0.045 0.03 16 to 18.5 2 to 3 10 to 15 4

fevicon-logo Mechanical Properties of SS A4-70 Hex Bolts

Grade Tensile Strength min. Mpa Stress at 0.2 % permanent strain Rp0.2a min. Mpa Elong (% in 4D min)
A4-70 700 450 0.4d

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fevicon-logo Types of Stainless Steel A4-70 Hex Bolts

Hex Bolt

SS A4-70 Hex Bolt

Heavy Hex Bolt

SS A4-70 Heavy Hex Bolt

Hex Tap Bolt

SS A4-70 Hex Tap Bolt

Hex Flange Bolt

SS A4-70 Hex Flange Bolt

Half Threaded Hex Bolt

SS A4-70 Half Threaded Hex Bolt

Fully Threaded Hex Bolt

A4-70 SS Fully Threaded Hex Bolt

Hex Machine Bolt

SS A4-70 Hex Machine Bolt

Hex Shoulder Bolt

SS A4-70 Hex Shoulder Bolt


Hex Bolt Manufacturers In India

  • 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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fevicon-logo Stainless Steel A4-70 Hex Bolts Application Industries

Aerospace Industry
Nuclear Industry
MEdical Industry
Marine Industry
Mining Industry
Automotive Industry
Construction Industry
Manufacturing Industry
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