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DIN931-1 ISO4014 Hexagon Head Bolts Partially Threaded Dacromet Silver-Gray Carbon Steel/Alloy Steel Class 8.8 10.9
High Corrosion Resistance: The Dacromet coating provides excellent corrosion resistance, especially in harsh environmental conditions such as high humidity, high salinity, or chemical corrosion.
High Temperature Stability: The Dacromet coating remains stable at relatively high temperatures (up to 300°C) without deteriorating like some other coatings.
Good Adhesion and Abrasion Resistance: The Dacromet coating exhibits strong adhesion to the base material and also possesses good abrasion resistance.
Environmental Friendliness: Compared to traditional zinc plating or paint coatings, the Dacromet coating is more environmentally friendly during production and usage as it does not contain harmful substances like chromates.
Uniformity: The Dacromet coating can uniformly cover the entire surface of the bolt, including hard-to-reach corners and crevices.
Color: The Dacromet coating typically has a silver-gray or silver-white appearance, making the bolts visually easier to identify.
Versatility: The Dacromet coating is suitable for various metal substrates such as steel, copper, aluminum, and more.
Automotive Industry: Bolts are extensively used in automotive manufacturing, especially in chassis, engine, and body structures. The Dacromet coating provides the necessary corrosion protection to ensure long-term reliability of vehicles under various climatic conditions.
Construction and Bridge Engineering: In construction and bridge projects, bolts are used to connect steel structures and concrete components. The Dacromet coating protects these bolts from environmental and chemical corrosion.
Marine Engineering: Metal components are prone to corrosion from seawater and salt spray in marine environments. The Dacromet coating offers essential protection to bolts and other metal components to ensure their long-term stability in harsh conditions.
Electrical and Electronic Equipment: Bolts are used to connect and secure various components in electrical and electronic devices. The Dacromet coating prevents the bolts from electrochemical corrosion, ensuring stable operation of the equipment over a long period.
In summary, DIN 931-1 bolts with a Dacromet coating exhibit excellent corrosion resistance, high temperature stability, adhesion, abrasion resistance, and other advantages, making them suitable for various environments and industries.
| Thread Size d | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M7 | M8 | M10 | M12 | |||
| P | Thread Pitch | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | ||
| b | Ref. | L≤125 | 9 | 10 | 11 | 12 | 13 | 14 | 16 | 18 | 20 | 22 | 26 | 30 | |
| 125＜L≤200 | - | - | - | - | - | - | 22 | 24 | 26 | 28 | 32 | 36 | |||
| L＞200 | - | - | - | - | - | - | - | - | - | - | 45 | 49 | |||
| c | min | 0.1 | 0.1 | 0.1 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | ||
| max | 0.25 | 0.25 | 0.25 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | |||
| da | max | 2 | 2.6 | 3.1 | 3.6 | 4.1 | 4.7 | 5.7 | 6.8 | 7.8 | 9.2 | 11.2 | 13.7 | ||
| ds | max=nominal size | 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | ||
| min | Grade A | 1.46 | 1.86 | 2.36 | 2.86 | 3.32 | 3.82 | 4.82 | 5.82 | 6.78 | 7.78 | 9.78 | 11.73 | ||
| Grade B | - | - | - | - | - | - | - | - | - | - | - | - | |||
| dw | min | Grade A | 2.4 | 3.2 | 4.1 | 4.6 | 5.1 | 5.9 | 6.9 | 8.9 | 9.8 | 11.6 | 15.6 | 17.4 | |
| Grade B | - | - | - | - | - | - | - | - | - | - | - | - | |||
| e | min | Grade A | 3.41 | 4.32 | 5.45 | 6.01 | 6.58 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | |
| Grade B | - | - | - | - | - | - | - | - | - | - | - | - | |||
| k | Nominal Size | 1.1 | 1.4 | 1.7 | 2 | 2.4 | 2.8 | 3.5 | 4 | 4.8 | 5.3 | 6.4 | 7.5 | ||
| Grade A | min | 0.98 | 1.28 | 1.58 | 1.88 | 2.28 | 2.68 | 3.35 | 3.85 | 4.65 | 5.15 | 6.22 | 7.32 | ||
| max | 1.22 | 1.52 | 1.82 | 2.12 | 2.52 | 2.92 | 3.65 | 4.15 | 4.95 | 5.45 | 6.58 | 7.68 | |||
| Grade B | min | - | - | - | - | - | - | - | - | - | - | - | - | ||
| max | - | - | - | - | - | - | - | - | - | - | - | - | |||
| k1 | min | 0.7 | 0.9 | 1.1 | 1.3 | 1.6 | 1.9 | 2.28 | 2.63 | 3.19 | 3.54 | 4.28 | 5.05 | ||
| r | min | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 | 0.4 | 0.4 | 0.6 | ||
| s | max=nominal size | 3.2 | 4 | 5 | 5.5 | 6 | 7 | 8 | 10 | 11 | 13 | 17 | 19 | ||
| min | Grade A | 3.02 | 3.82 | 4.82 | 5.32 | 5.82 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | ||
| Grade B | - | - | - | - | - | - | - | - | - | - | - | - | |||
| Length of Thread b | - | - | - | - | - | - | - | - | - | - | - | - | |||
| Thread Size d | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | (M33) | M36 | (M39) | |||
| P | Thread Pitch | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | ||
| b | Ref. | L≤125 | 34 | 38 | 42 | 46 | 50 | 54 | 60 | 66 | 72 | 78 | 84 | |
| 125＜L≤200 | 40 | 44 | 48 | 52 | 56 | 60 | 66 | 72 | 78 | 84 | 90 | |||
| L＞200 | 53 | 57 | 61 | 65 | 69 | 73 | 79 | 85 | 91 | 97 | 103 | |||
| c | min | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | ||
| max | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 1 | |||
| da | max | 15.7 | 17.7 | 20.2 | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | ||
| ds | max=nominal size | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | ||
| min | Grade A | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | - | - | - | - | - | ||
| Grade B | - | 15.57 | 17.57 | 19.48 | 21.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 38.38 | |||
| dw | min | Grade A | 20.5 | 22.5 | 25.3 | 28.2 | 30 | 33.6 | - | - | - | - | - | |
| Grade B | - | 22 | 24.8 | 27.7 | 29.5 | 33.2 | 38 | 42.7 | 46.6 | 51.1 | 55.9 | |||
| e | min | Grade A | 24.49 | 26.75 | 30.14 | 33.53 | 35.72 | 39.98 | - | - | - | - | - | |
| Grade B | - | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | |||
| k | Nominal Size | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 | ||
| Grade A | min | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | - | - | - | - | - | ||
| max | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | - | - | - | - | - | |||
| Grade B | min | - | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | ||
| max | - | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | |||
| k1 | min | 5.96 | 6.8 | 7.8 | 8.5 | 9.6 | 10.3 | 11.7 | 12.8 | 14.4 | 15.5 | 17.2 | ||
| r | min | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | ||
| s | max=nominal size | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | ||
| min | Grade A | 21.67 | 23.67 | 26.67 | 29.67 | 31.61 | 35.38 | - | - | - | - | - | ||
| Grade B | - | 23.16 | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | |||
| Length of Thread b | - | - | - | - | - | - | - | - | - | - | - | |||