SS grade A4-70 flat head hex bolts supplier in India.
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28 Dec 2024 09:22:13 am.
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Specification of A4-70 Stainless Steel Hex Bolts
A4-70 hex bolts are made from high-quality stainless steel, specificallydesigned for high-strength and corrosion-resistant applications. These boltsare manufactured to international standards, including ISO 4017, DIN931,GB5783, and ASTM. The material used for these bolts typically includes variousstainless steel alloys like SS304, SS316, SS316L, and others in the A2 and A4series, with the A4-70 grade offering superior resistance to corrosion comparedto A2-70.
The A4-70 hex bolts come in a wide range of sizes, from M2 to M100 indiameter and lengths ranging from 6mm to 500mm. They are available in multiplehead types, including hex, square, round, hex flange, and flat, with severalneck types like hex, square, triangular, and knurled. The bolts can becustomized with different drive types such as Phillips, slotted, hex socket,Torx, and square slot, ensuring versatility for various applications.
Material and Properties of A4-70 Bolts
The A4-70 material, composed primarily of stainless steel alloys, providesoutstanding resistance to corrosion, particularly in marine and otheraggressive environments. The "A4" designation refers to stainlesssteel of the 316 grade, while the "70" signifies the bolt's strength(700 MPa minimum tensile strength). This combination of materials and strengthensures that A4-70 bolts can withstand harsh conditions, including exposure toseawater and industrial chemicals.
A4-70 stainless steel bolts exhibit excellent mechanical properties,including high tensile strength, which makes them ideal for heavy-dutyapplications. The material’s resistance to pitting, crevice corrosion, andstress corrosion cracking is a significant advantage, particularly inindustries like aerospace, automotive, and chemical processing.
Surface Treatments for Enhanced Durability
To further enhance the durability and aesthetic appeal of A4-70 hex bolts,various surface treatments can be applied. These include passivation,anodizing, sand blasting, electroplating (zinc, nickel, black oxide, etc.), andhot-dip galvanizing. These finishes not only improve the corrosion resistanceof the bolts but also help with their visual appearance and wear resistance.Surface coatings such as Teflon, cadmium, and zinc can also be used dependingon the environmental conditions and specific requirements of the application.
Applications of A4-70 Stainless Steel Hex Bolts
Due to their superior properties, A4-70 hex bolts are used in a wide arrayof industries. They are commonly found in wind towers, nuclear power plants,railway systems, automotive manufacturing, and construction projects. Thesebolts are also crucial in the electronics industry, where high-strength,corrosion-resistant fasteners are needed for sensitive equipment.
Dimensions and Tolerances
A4-70 bolts are produced according to standard dimensions like ASME B18.6.3,ensuring compatibility with other fasteners in the same class. The bolts areprecision-engineered with a tolerance of +/- 0.01mm to +/- 0.05mm, guaranteeinga tight fit and reliable performance in demanding applications. The productionprocess involves several stages, including wire drawing, cold heading, tapping,heat treatment, and surface plating, all aimed at delivering high-qualityfasteners.
Conclusion
A4-70 stainless steel hex bolts are an essential component in modernindustrial applications, offering a blend of strength, corrosion resistance,and versatility. Their wide range of sizes, head types, and surface treatmentsmakes them ideal for industries that require reliable and durable fasteners.Whether for wind towers, automotive manufacturing, or electronic equipment,A4-70 hex bolts ensure the longevity and safety of critical systems. Byunderstanding the specifications, properties, and applications of these bolts,industries can make informed decisions to meet their specific needs.
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