An ISO 9001:2015 Certified Company
An ISO 9001:2015 Certified Company
| Size (M) |
Length | Length (min) | Length (max) | P | e (min) | k (max) | r (min) | Weight as per 1000 units in kgs |
|---|---|---|---|---|---|---|---|---|
| M3 | 8 | 7.71 | 8.29 | 0.5 | 2.3 | 1.7 | 0.1 | 0.470 |
| M3 | 10 | 9.71 | 10.29 | 0.5 | 2.3 | 1.7 | 0.1 | 0.560 |
| M3 | 12 | 11.65 | 12.35 | 0.5 | 2.3 | 1.7 | 0.1 | 0.650 |
| M3 | 16 | 15.65 | 16.35 | 0.5 | 2.3 | 1.7 | 0.1 | 0.830 |
| M3 | 20 | 19.58 | 20.42 | 0.5 | 2.3 | 1.7 | 0.1 | 1.000 |
| M3 | 25 | 24.58 | 25.42 | 0.5 | 2.3 | 1.7 | 0.1 | 1.350 |
| M3 | 30 | 29.58 | 30.42 | 0.5 | 2.3 | 1.7 | 0.1 | 1.630 |
| M4 | 8 | 7.71 | 8.29 | 0.7 | 2.87 | 2.3 | 0.2 | 0.920 |
| M4 | 10 | 9.71 | 10.29 | 0.7 | 2.87 | 2.3 | 0.2 | 1.070 |
| M4 | 12 | 11.65 | 12.35 | 0.7 | 2.87 | 2.3 | 0.2 | 1.230 |
| M4 | 16 | 15.65 | 16.35 | 0.7 | 2.87 | 2.3 | 0.2 | 1.530 |
| M4 | 20 | 19.58 | 20.42 | 0.7 | 2.87 | 2.3 | 0.2 | 1.840 |
| M4 | 25 | 24.58 | 25.42 | 0.7 | 2.87 | 2.3 | 0.2 | 2.230 |
| M4 | 30 | 29.58 | 30.42 | 0.7 | 2.87 | 2.3 | 0.2 | 2.900 |
| M4 | 35 | 34.5 | 35.5 | 0.7 | 2.87 | 2.3 | 0.2 | 3.400 |
| M4 | 40 | 39.5 | 40.5 | 0.7 | 2.87 | 2.3 | 0.2 | 3.900 |
| M5 | 8 | 7.71 | 8.29 | 0.8 | 3.44 | 2.8 | 0.2 | 1.600 |
| M5 | 10 | 9.71 | 10.29 | 0.8 | 3.44 | 2.8 | 0.2 | 1.850 |
| M5 | 12 | 11.65 | 12.35 | 0.8 | 3.44 | 2.8 | 0.2 | 2.100 |
| M5 | 16 | 15.65 | 16.35 | 0.8 | 3.44 | 2.8 | 0.2 | 2.590 |
| M5 | 20 | 19.58 | 20.42 | 0.8 | 3.44 | 2.8 | 0.2 | 3.090 |
| M5 | 25 | 24.58 | 25.42 | 0.8 | 3.44 | 2.8 | 0.2 | 3.710 |
| M5 | 30 | 29.58 | 30.42 | 0.8 | 3.44 | 2.8 | 0.2 | 4.330 |
| M5 | 35 | 34.5 | 35.5 | 0.8 | 3.44 | 2.8 | 0.2 | 5.430 |
| M5 | 40 | 39.5 | 40.5 | 0.8 | 3.44 | 2.8 | 0.2 | 6.200 |
| M5 | 50 | 49.5 | 50.5 | 0.8 | 3.44 | 2.8 | 0.2 | 7.740 |
| M6 | 8 | 7.71 | 8.29 | 1 | 4.58 | 3.3 | 0.3 | 2.350 |
| M6 | 10 | 9.71 | 10.29 | 1 | 4.58 | 3.3 | 0.3 | 2.700 |
| M6 | 12 | 11.65 | 12.35 | 1 | 4.58 | 3.3 | 0.3 | 3.050 |
| M6 | 16 | 15.65 | 16.35 | 1 | 4.58 | 3.3 | 0.3 | 3.760 |
| M6 | 20 | 19.58 | 20.42 | 1 | 4.58 | 3.3 | 0.3 | 4.460 |
| M6 | 25 | 24.58 | 25.42 | 1 | 4.58 | 3.3 | 0.3 | 5.340 |
| M6 | 30 | 29.58 | 30.42 | 1 | 4.58 | 3.3 | 0.3 | 6.220 |
| M6 | 35 | 34.5 | 35.5 | 1 | 4.58 | 3.3 | 0.3 | 7.100 |
| M6 | 40 | 39.5 | 40.5 | 1 | 4.58 | 3.3 | 0.3 | 8.830 |
| M6 | 50 | 49.5 | 50.5 | 1 | 4.58 | 3.3 | 0.3 | 11.000 |
| M8 | 10 | 9.70 | 10.29 | 1.25 | 5.72 | 4.4 | 0.5 | 5.470 |
| M8 | 12 | 11.65 | 12.35 | 1.25 | 5.72 | 4.4 | 0.5 | 6.100 |
| M8 | 16 | 15.65 | 16.35 | 1.25 | 5.72 | 4.4 | 0.5 | 7.350 |
| M8 | 20 | 19.58 | 20.42 | 1.25 | 5.72 | 4.4 | 0.5 | 8.600 |
| M8 | 25 | 24.58 | 25.42 | 1.25 | 5.72 | 4.4 | 0.5 | 10.200 |
| M8 | 30 | 29.58 | 30.42 | 1.25 | 5.72 | 4.4 | 0.5 | 11.700 |
| M8 | 35 | 34.5 | 35.5 | 1.25 | 5.72 | 4.4 | 0.5 | 13.300 |
| M8 | 40 | 39.5 | 40.5 | 1.25 | 5.72 | 4.4 | 0.5 | 14.800 |
| M8 | 50 | 49.5 | 50.5 | 1.25 | 5.72 | 4.4 | 0.5 | 19.900 |
| M8 | 60 | 59.4 | 60.6 | 1.25 | 5.72 | 4.4 | 0.5 | 24.800 |
| M10 | 12 | 11.65 | 12.35 | 1.5 | 6.86 | 5.5 | 0.5 | 10.100 |
| M10 | 16 | 15.65 | 16.35 | 1.5 | 6.86 | 5.5 | 0.5 | 12.100 |
| M10 | 20 | 19.58 | 20.42 | 1.5 | 6.86 | 5.5 | 0.5 | 14.100 |
| M10 | 25 | 24.58 | 25.42 | 1.5 | 6.86 | 5.5 | 0.5 | 16.600 |
| M10 | 30 | 29.58 | 30.42 | 1.5 | 6.86 | 5.5 | 0.5 | 19.100 |
| M10 | 35 | 34.5 | 35.5 | 1.5 | 6.86 | 5.5 | 0.5 | 21.600 |
| M10 | 40 | 39.5 | 40.5 | 1.5 | 6.86 | 5.5 | 0.5 | 24.100 |
| M10 | 50 | 49.5 | 50.5 | 1.5 | 6.86 | 5.5 | 0.5 | 30.100 |
| M10 | 60 | 59.4 | 60.6 | 1.5 | 6.86 | 5.5 | 0.5 | 35.700 |
| M10 | 70 | 69.4 | 70.6 | 1.5 | 6.86 | 5.5 | 0.5 | 41.200 |
| M12 | 20 | 19.58 | 20.42 | 1.75 | 9.15 | 6.5 | 1 | 21.200 |
| M12 | 25 | 24.58 | 25.42 | 1.75 | 9.15 | 6.5 | 1 | 24.800 |
| M12 | 30 | 29.58 | 30.42 | 1.75 | 9.15 | 6.5 | 1 | 28.500 |
| M12 | 35 | 34.5 | 35.5 | 1.75 | 9.15 | 6.5 | 1 | 32.100 |
| M12 | 40 | 39.5 | 40.5 | 1.75 | 9.15 | 6.5 | 1 | 35.700 |
| M12 | 50 | 49.5 | 50.5 | 1.75 | 9.15 | 6.5 | 1 | 43.000 |
| M12 | 60 | 59.4 | 60.6 | 1.75 | 9.15 | 6.5 | 1 | 54.000 |
| M12 | 70 | 69.4 | 70.6 | 1.75 | 9.15 | 6.5 | 1 | 62.900 |
| M16 | 30 | 29.58 | 30.42 | 2 | 11.43 | 7.5 | 1 | 51.800 |
| M16 | 35 | 34.5 | 35.5 | 2 | 11.43 | 7.5 | 1 | 58.400 |
| M16 | 40 | 39.5 | 40.5 | 2 | 11.43 | 7.5 | 1 | 65.100 |
| M16 | 50 | 49.5 | 50.5 | 2 | 11.43 | 7.5 | 1 | 78.400 |
| M16 | 60 | 59.4 | 60.6 | 2 | 11.43 | 7.5 | 1 | 91.700 |
| M16 | 70 | 69.4 | 70.6 | 2 | 11.43 | 7.5 | 1 | 111.000 |
| M16 | 80 | 79.4 | 80.6 | 2 | 11.43 | 7.5 | 1 | 127.000 |
| M16 | 90 | 89.3 | 90.7 | 2 | 11.43 | 7.5 | 1 | 143.000 |
| M20 | 35 | 34.5 | 35.5 | 2.5 | 13.72 | 8.5 | 1 | 91.400 |
| M20 | 40 | 39.5 | 40.5 | 2.5 | 13.72 | 8.5 | 1 | 102.000 |
| M20 | 50 | 49.5 | 50.5 | 2.5 | 13.72 | 8.5 | 1 | 123.000 |
| M20 | 60 | 59.4 | 60.6 | 2.5 | 13.72 | 8.5 | 1 | 143.000 |
| M20 | 70 | 69.4 | 70.6 | 2.5 | 13.72 | 8.5 | 1 | 164.000 |
| M20 | 80 | 79.4 | 80.6 | 2.5 | 13.72 | 8.5 | 1 | 200.000 |
| M20 | 90 | 89.3 | 90.7 | 2.5 | 13.72 | 8.5 | 1 | 226.000 |
| M20 | 100 | 99.3 | 100.7 | 2.5 | 13.72 | 8.5 | 1 | 253.000 |
| M24 | 50 | 49.5 | 50.5 | 3 | 16 | 14 | 1.6 | 179.000 |
| M24 | 60 | 59.4 | 60.6 | 3 | 16 | 14 | 1.6 | 209.000 |
| M24 | 70 | 69.4 | 70.6 | 3 | 16 | 14 | 1.6 | 239.000 |
| M24 | 80 | 79.4 | 80.6 | 3 | 16 | 14 | 1.6 | 269.000 |
| M24 | 90 | 89.3 | 90.7 | 3 | 16 | 14 | 1.6 | 299.000 |
| M24 | 100 | 99.3 | 100.7 | 3 | 16 | 14 | 1.6 | 340.000 |
DIN 7991 is a German standard that defines the technical specifications for countersunk flat head screws with hexagon socket. These screws, also known as flat head socket cap screws or flat head allen screws, are widely used in various engineering and mechanical applications. DIN 7991 provides detailed guidelines for the manufacturing and application of these fasteners, including parameters such as dimensions, material requirements, and performance characteristics. DIN 7991 aligns with international standards established by the International Organization for Standardization (ISO). The corresponding ISO standard for countersunk flat head screws with hexagon socket is ISO 10642. This alignment with ISO standards ensures that screws manufactured according to ISO 10642 conform to international benchmarks for quality, dimensions, and material properties, facilitating their use in a wide range of mechanical and engineering applications across different markets worldwide The standard presents specific dimensional requirements for countersunk flat head screws, covering thread sizes ranging from M3 to M24. This includes detailed specifications for the head diameter, head height, and overall length, ensuring that the screws are compatible with a range of components and capable of delivering secure and precise fastening in various mechanical and structural systems. In addition to dimensional specifications, DIN 7991 addresses the material properties and mechanical attributes of countersunk flat head screws. These fasteners are typically made from high-strength alloy steels to provide the necessary tensile strength, hardness, and resistance to mechanical stresses. The standard specifies material grades and heat treatment processes to ensure that the screws meet the required performance standards and can withstand the loads and forces encountered in diverse applications. Countersunk flat head screws specified by DIN 7991 are essential components in machinery, equipment assembly, and structural systems. Their flat head design allows for a flush finish when installed, making them suitable for applications where a smooth and even surface is desirable.
