The DIN standards are recognized worldwide and used extensively in many industries, including engineering, manufacturing, and construction. In this article, we will discuss some of the DIN standards related to  machine screws, namely DIN 84, DIN 7985, DIN 85, DIN 963, DIN 965, DIN 964, and DIN 966.

DIN 84: This standard specifies the dimensions and tolerances of cheese head screws. Cheese head screws have a cylindrical head with a flat top and a flat bottom. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a straight slot for a screwdriver or a cross recessed slot. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 7985: This standard specifies the dimensions and tolerances of pan head screws. Pan head screws have a rounded, dome-shaped head with a flat bearing surface. The head has a smaller diameter than the shank, which allows for a smaller contact area with the surface being fastened. The screw has a cross recessed slot or a hexagonal socket. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 85: This standard specifies the dimensions and tolerances of round head screws. Round head screws have a hemispherical head with a flat bearing surface. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a straight slot for a screwdriver or a cross recessed slot. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 963: This standard specifies the dimensions and tolerances of countersunk head screws. Countersunk head screws have a conical head with a flat bearing surface. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a straight slot for a screwdriver or a cross recessed slot. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 965: This standard specifies the dimensions and tolerances of countersunk flat head screws. Countersunk flat head screws have a conical head with a flat bearing surface. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a cross recessed slot or a hexagonal socket. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 964: This standard specifies the dimensions and tolerances of oval head screws. Oval head screws have an elliptical head with a flat bearing surface. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a straight slot for a screwdriver or a cross recessed slot. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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DIN 966: This standard specifies the dimensions and tolerances of raised countersunk head screws. Raised countersunk head screws have a conical head with a flat bearing surface that is raised above the surface of the material being fastened. The head has a larger diameter than the shank, which allows for a larger contact area with the surface being fastened. The screw has a straight slot for a screwdriver or a cross recessed slot. The dimensions specified in the standard include the diameter, length, head diameter, head height, and thread length. The tolerances ensure that the screws can fit into a corresponding nut or threaded hole.

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In addition to the dimensions and tolerances, the DIN standards also specify the material, surface finish, and other properties of the screws. For example, the DIN 84 standard specifies that cheese head screws should be made of steel, stainless steel, or brass, and should have a black oxide or zinc plating. The standard also specifies the minimum and maximum tensile strength, hardness, and torque values.

The DIN standards play an important role in ensuring the interchangeability and compatibility of screws and other machine parts. By using standardized dimensions and tolerances, manufacturers can produce parts that can be easily assembled and disassembled, and can be replaced with similar parts from different suppliers. This reduces the cost and complexity of manufacturing and maintenance, and improves the reliability and safety of the equipment.

In conclusion, DIN 84, DIN 7985, DIN 85, DIN 963, DIN 965, DIN 964, and DIN 966 are important standards for screws and machine parts. They specify the dimensions, tolerances, material, surface finish, and other properties of the parts, and ensure their interchangeability and compatibility. By following these standards, manufacturers can produce high-quality parts that meet the needs of their customers, and contribute to the overall efficiency and safety of the industry.

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