Metric Size Grade 10.9
Metric Hex Head Cap Screws Grade 10.9
Metric hex head cap screws are commonly used fasteners that feature a hexagonal-shaped head and a threaded shaft. These fasteners are essential in many mechanical applications due to their durability, strength, and versatility. Grade 10.9 is a classification that refers to the material and mechanical properties of the screw. The "10.9" designation is derived from the tensile strength and yield strength of the screw material. Specifically, the 10 in “10.9” represents the tensile strength, which is 1,000 MPa (megapascals), and the 9 refers to the yield strength, which is 900 MPa. This means the screw can withstand a tensile load of 1,000 MPa before breaking and will begin to deform plastically (yielding) at 900 MPa. This high-strength rating makes grade 10.9 screws suitable for demanding industrial applications where strength is critical.
Zinc Cr3 Plating
Many hex head cap screws, including grade 10.9 screws, come with a zinc plating. Zinc plating is a corrosion-resistant coating applied to steel fasteners to improve their longevity and resistance to rust. The term "Cr3" refers to the use of trivalent chromium in the plating process. Trivalent chromium plating, also known as zinc Cr3 or hexavalent chromium-free plating, is a more environmentally friendly alternative to older, more toxic hexavalent chromium coatings. It provides a similar level of corrosion protection and is commonly used in various industries to ensure that screws and bolts resist rust, especially in harsh or humid environments. Zinc Cr3 plating also offers a decorative finish with a bluish hue, enhancing the appearance of the screws.
Specifications: DIN 931, DIN 933, ISO 4014, ISO 4017
There are several international standards for metric hex head cap screws, and these include DIN 931, DIN 933, ISO 4014, and ISO 4017. The DIN 931 and DIN 933 are German standards that define the dimensions, mechanical properties, and material requirements for hex head cap screws. DIN 931 specifies screws with partial threads, while DIN 933 covers fully threaded screws. ISO 4014 and ISO 4017 are the international equivalents of these German standards, ensuring uniformity in the production of these fasteners across different countries. The ISO standards cover screws with both partial and full threads, ensuring that the screws can fit into standard-sized threaded holes for reliable fastening.
Sizing
Metric hex head cap screws are sized based on their nominal diameter (often referred to in millimeters) and the length of the screw. The most common metric sizes for these fasteners are M6, M8, M10, M12, and so on. The "M" denotes the metric system, while the number following it indicates the diameter of the screw. The length is usually specified in millimeters, making it easy to choose the appropriate screw based on the application’s requirements.
Industries and Applications
Grade 10.9 hex head cap screws are widely used in industries that require high-strength fasteners, such as automotive, machinery, construction, and aerospace. In these sectors, they are used to secure components under high stress, such as engine parts, heavy machinery, structural elements, and equipment that undergo heavy load-bearing. The combination of the high tensile strength of grade 10.9 and the corrosion protection of zinc Cr3 plating makes these fasteners reliable and long-lasting, even in demanding environments.
Metric hex head cap screws are commonly used fasteners that feature a hexagonal-shaped head and a threaded shaft. These fasteners are essential in many mechanical applications due to their durability, strength, and versatility. Grade 10.9 is a classification that refers to the material and mechanical properties of the screw. The "10.9" designation is derived from the tensile strength and yield strength of the screw material. Specifically, the 10 in “10.9” represents the tensile strength, which is 1,000 MPa (megapascals), and the 9 refers to the yield strength, which is 900 MPa. This means the screw can withstand a tensile load of 1,000 MPa before breaking and will begin to deform plastically (yielding) at 900 MPa. This high-strength rating makes grade 10.9 screws suitable for demanding industrial applications where strength is critical.
Zinc Cr3 Plating
Many hex head cap screws, including grade 10.9 screws, come with a zinc plating. Zinc plating is a corrosion-resistant coating applied to steel fasteners to improve their longevity and resistance to rust. The term "Cr3" refers to the use of trivalent chromium in the plating process. Trivalent chromium plating, also known as zinc Cr3 or hexavalent chromium-free plating, is a more environmentally friendly alternative to older, more toxic hexavalent chromium coatings. It provides a similar level of corrosion protection and is commonly used in various industries to ensure that screws and bolts resist rust, especially in harsh or humid environments. Zinc Cr3 plating also offers a decorative finish with a bluish hue, enhancing the appearance of the screws.
Specifications: DIN 931, DIN 933, ISO 4014, ISO 4017
There are several international standards for metric hex head cap screws, and these include DIN 931, DIN 933, ISO 4014, and ISO 4017. The DIN 931 and DIN 933 are German standards that define the dimensions, mechanical properties, and material requirements for hex head cap screws. DIN 931 specifies screws with partial threads, while DIN 933 covers fully threaded screws. ISO 4014 and ISO 4017 are the international equivalents of these German standards, ensuring uniformity in the production of these fasteners across different countries. The ISO standards cover screws with both partial and full threads, ensuring that the screws can fit into standard-sized threaded holes for reliable fastening.
Sizing
Metric hex head cap screws are sized based on their nominal diameter (often referred to in millimeters) and the length of the screw. The most common metric sizes for these fasteners are M6, M8, M10, M12, and so on. The "M" denotes the metric system, while the number following it indicates the diameter of the screw. The length is usually specified in millimeters, making it easy to choose the appropriate screw based on the application’s requirements.
Industries and Applications
Grade 10.9 hex head cap screws are widely used in industries that require high-strength fasteners, such as automotive, machinery, construction, and aerospace. In these sectors, they are used to secure components under high stress, such as engine parts, heavy machinery, structural elements, and equipment that undergo heavy load-bearing. The combination of the high tensile strength of grade 10.9 and the corrosion protection of zinc Cr3 plating makes these fasteners reliable and long-lasting, even in demanding environments.