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Metric Size Grade 8.8 Fasteners

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Metric Hex Head Cap Screws are essential fasteners used to join components in numerous industries, including automotive, construction, and machinery. They are available in different grades and standards, each catering to specific requirements for strength, thread design, and application. Some of the key standards include Grade 8.8, DIN 933, DIN 931, DIN 960, DIN 961, ISO 4014, and ISO 4017.

Grade 8.8

Grade 8.8 denotes a strength grade for metric hex head cap screws, indicating a tensile strength of 800 MPa (megapascals) and a yield strength of 640 MPa. This grade is suitable for high-stress environments requiring strong mechanical properties, such as automotive and structural applications.

DIN 933

DIN 933 is a German standard that specifies hexagonal head screws with full threads. These screws are designed to provide a secure connection over longer distances and are often used where high torque and thread engagement are needed, such as in heavy machinery.

DIN 931

DIN 931 defines hexagonal head screws with partially threaded shafts. Unlike DIN 933, which has full threading, DIN 931 screws have a threaded portion that extends only partway up the screw. This design is typically used in applications where the full thread engagement isn't critical, offering a better grip in certain assemblies.

DIN 960

DIN 960 covers hexagonal head screws with a fine pitch thread. These screws are designed to handle finer threading, which can be useful for high-precision applications where a more exact fit is required, such as in machine tools or precision machinery.

DIN 961

DIN 961 is similar to DIN 931 but with a fine thread design. These hex head screws with partial threads are used in applications where fine pitch threads offer improved tension control, and full thread engagement is not necessary.

ISO 4014

ISO 4014 is an international standard for hex head cap screws with partial threads. These screws are designed for general-purpose use and are known for their global compatibility. They are commonly used in construction, machinery, and automotive sectors, ensuring broad applicability across different industries.

ISO 4017

ISO 4017 is an international standard similar to DIN 933, specifying hex head cap screws with full threads. These screws meet dimensional and material specifications that are recognized worldwide, making them ideal for international projects and applications requiring secure fastening and strong mechanical properties.

Each of these standards defines unique characteristics that make them suitable for specific applications, ensuring the appropriate level of strength, thread engagement, and compatibility for various industrial needs.

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