Cylindrical head hexagon socket screws, also referred to as hexagon socket bolts and cup head screws, have a cylindrical head and a hexagon socket hole.
Hexagon socket head screws have greater tightening force and resistance to loosening. Its inner hexagonal hole can be tightened with a hexagonal wrench. The tightening force is concentrated and the threads are not easily damaged. The cylindrical head design allows the screw to be used in limited spaces and able to withstand larger loads.
Materials include stainless steel and iron, and the surface may be galvanized or chromed to enhance corrosion resistance. Commonly used strength grades include grade 4.8, grade 8.8, grade 10.9, and grade 12.9. Among them, bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and have been heat treated (quenched and tempered). They are commonly called high-strength bolts, and the others are generally called For ordinary bolts. Used in machinery manufacturing, furniture assembly, electronic products and other fields, hexagonal cylindrical head machine screw and flat washer combinations are widely used in machinery manufacturing industries such as automobiles, robots, and construction machinery. They are used to fix different parts and ensure the reliability of mechanical equipment. and security.
DIN7984 hexagon socket screws have a thin head and are suitable for compact spaces and applications that require a lower head height, such as assembly in some mechanical equipment or electronic products. The thickness of the DIN7984 head is relatively small, so it is more suitable for use in scenes that require a more beautiful appearance.
The Specification Form of DIN7984 is as bellow
| DIN7984 | M | |||||||||||||
| D | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | |
| P | Pitch | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 |
| b | L≤125 | 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 |
| 125＜L≤200 | / | / | / | / | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | |
| L＞200 | / | / | / | / | / | / | / | / | 57 | 61 | 65 | 69 | 73 | |
| da | max | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 |
| dk | max=nominal size | 5.5 | 7 | 8.5 | 10 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 33 | 36 |
| min | 5.32 | 6.78 | 8.28 | 9.78 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.67 | 29.67 | 32.61 | 35.61 | |
| ds | max=nominal size | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| min | 2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | |
| e | min | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 8.01 | 9.15 | 11.43 | 13.72 | 13.72 | 16 | 16 | 19.44 |
| L1 | max | 0.51 | 0.6 | 0.6 | 0.68 | 1.02 | 1.02 | 1.87 | 1.87 | 1.87 | 1.87 | 2.04 | 2.04 | 2.04 |
| k | max=nominal size | 2 | 2.8 | 3.5 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| min | 1.86 | 2.66 | 3.32 | 3.82 | 4.82 | 5.82 | 6.78 | 7.78 | 8.78 | 9.78 | 10.73 | 11.73 | 12.73 | |
| r | max | 0.3 | 0.35 | 0.35 | 0.4 | 0.6 | 0.6 | 0.85 | 0.85 | 0.85 | 1.1 | 1.2 | 1.2 | 1.2 |
| min | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | |
| s | Nominal Size | 2 | 2.5 | 3 | 4 | 5 | 7 | 8 | 10 | 12 | 12 | 14 | 14 | 17 |
| max | 2.1 | 2.6 | 3.1 | 4.12 | 5.14 | 7.175 | 8.175 | 10.175 | 12.212 | 12.212 | 14.212 | 14.212 | 17.23 | |
| min | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 7.025 | 8.025 | 10.025 | 12.032 | 12.032 | 14.032 | 14.032 | 17.05 | |
| t | Nominal Size | 1.5 | 2.3 | 2.7 | 3 | 3.8 | 4.5 | 5 | 5.3 | 5.5 | 6.5 | 7.5 | 8 | 8 |
| max | 1.62 | 2.42 | 2.82 | 3.12 | 3.95 | 4.65 | 5.15 | 5.45 | 5.65 | 6.68 | 7.68 | 8.18 | 8.18 | |
| min | 1.38 | 2.18 | 2.58 | 2.88 | 3.65 | 4.35 | 4.85 | 5.15 | 5.35 | 6.32 | 7.32 | 7.82 | 7.82 | |
①Material:
a)Steel, Property class: 8.8，10.9; Standard DIN EN ISO 898-1
b)Stainless steel, Steel grade: A2-70, A4-70; Standard DIN EN ISO 3506-1
Product standard of this physical picture: DIN7984）
Spec:M5-0.8*16 Strength：8.8 Material:10B21 Surface treatment :heat treatment,Zinc Plated
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