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Carbon Steel Galvanized Black Hexagonal Bolt Screw 4.8 8.8 Grade M6-M24 Plain Finish Hex Head
●Material: Carbon Steel
●Surface Treatment: Galvanized, Nickel Plated, Black Oxide, Hot Dip Galvanizing, Dacromet
●Metric Strength Grades: 4.8, 8.8, 10.9, 12.9
●Metric Thread Diameter: M3 ~ M24
●Metric Thread Length: 4 ~ 100
Description
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Product Description
Grade 4.8/8.8 Carbon Steel Black Oxide Hex Head BoltsThese hex head bolts are manufactured from high-quality carbon steel, featuring an outer hexagonal head design for easy tightening with standard wrenches. The surface is treated with black oxide (blackening) technology, which forms a dense protective film to enhance corrosion resistance and reduce friction during installation. Available in metric (M3-M24) and imperial (1/4"-1") sizes, with coarse thread (Metric Coarse/UNC) as standard (fine thread optional), they come in full-thread or half-thread configurations to meet diverse assembly needs. Compliant with ISO/DIN/ANSI standards, these bolts offer reliable mechanical performance, ensuring strong clamping force and stable fixation in various applications.
| Thread size d |
M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | |
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 |
| a | Max | 2.4 | 3 | 4 | 4.5 | 5.3 | 6 | 6 | 7.5 | 7.5 | 7.5 | 9 | 9 |
| Min | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | |
| C | Max | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| da | Max | 6 | 7.2 | 10.2 | 12.2 | 14.7 | 16.7 | 18.7 | 21.2 | 24.4 | 26.4 | 28.4 | 32.4 |
| dw | Min | 6.74 | 8.74 | 11.47 | 14.47 | 16.47 | 19.15 | 22 | 24.85 | 27.7 | 31.35 | 33.25 | 38 |
| e | Min | 8.63 | 10.89 | 14.2 | 17.59 | 19.85 | 22.78 | 26.17 | 29.56 | 32.95 | 37.29 | 39.55 | 45.2 |
| k | Nominal | 3.5 | 4 | 5.3 | 6.4 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 |
| Max | 3.875 | 4.375 | 5.675 | 6.85 | 7.95 | 9.25 | 10.75 | 12.4 | 13.4 | 14.9 | 15.9 | 17.9 | |
| Min | 3.125 | 3.625 | 4.925 | 5.95 | 7.05 | 8.35 | 9.25 | 10.6 | 11.6 | 13.1 | 14.1 | 16.1 | |
| k₁ | Min | 2.19 | 2.54 | 3.45 | 4.17 | 4.94 | 5.85 | 6.48 | 7.42 | 8.12 | 9.17 | 9.87 | 11.27 |
| r | Min | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1 |
| S | Max | 8.00 | 10.00 | 13.00 | 16.00 | 18.00 | 21.00 | 24.00 | 27.00 | 30.00 | 34 | 36 | 41 |
| Min | 7.64 | 9.64 | 12.57 | 15.57 | 17.57 | 20.16 | 23.16 | 26.16 | 29.16 | 33 | 35 | 40 | |
| Thread size d |
M30 | (M33) | M36 | (M39) | M42 | (M45) | M48 | (M52) | M56 | (M60) | M64 | ||
| P | Pitch | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 | 5.5 | 5.5 | 6 | |
| a | Max | 10.5 | 10.5 | 12 | 12 | 13.5 | 13.5 | 15 | 15 | 16.5 | 16.5 | 18 | |
| Min | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 | 5.5 | 5.5 | 6 | ||
| c | Max | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| da | Max | 35.4 | 38.4 | 42.4 | 45.4 | 48.6 | 52.6 | 56.6 | 62.6 | 67 | 71 | 75 | |
| dw | Min | 42.75 | 46.55 | 51.11 | 55.86 | 59.95 | 64.7 | 69.45 | 74.2 | 78.66 | 83.41 | 88.16 | |
| e | Min | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 | 93.56 | 99.21 | 104.86 | |
| k | 公称 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 | 35 | 38 | 40 | |
| Max | 19.75 | 22.05 | 23.55 | 26.05 | 27.05 | 29.05 | 31.05 | 34.25 | 36.25 | 39.25 | 41.25 | ||
| Min | 17.65 | 19.95 | 21.45 | 23.95 | 24.95 | 26.95 | 28.95 | 31.75 | 33.75 | 36.75 | 38.75 | ||
| k₁ | Min | 12.36 | 13.97 | 15.02 | 16.77 | 17.47 | 18.87 | 20.27 | 22.23 | 23.63 | 25.73 | 27.13 | |
| 『 | Min | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | 2 | 2 | 2 | |
| S | Max | 46 | 50 | 55.0 | 60.0 | 65.0 | 70.0 | 75.0 | 80.0 | 85.0 | 90.0 | 95.0 | |
| Min | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 | 82.8 | 87.8 | 92.8 | ||
Company Information
Hebei Fujinrui Metal Products Co., Ltd. is an enterprise integrating fastener product production and metal surface treatment. It has multiple machining workshops and surface treatment workshops, with a workforce of more than 300 pcs employees, boasting a mature production scale and strong technical strength.
The company's can produce national standard self-drilling screws, national standard external hexagon bolts, socket head cap screws, nuts, flange bolts and nuts, national standard flat washers and spring washers, etc.and there are always bolts and self-drilling screws in stock, In addition, it undertakes external metal surface processing, adopting processes such as Dacromet, Geomet, Luxiubao, Magni, Ruspert, etc. The products processed can pass the neutral salt spray test for up to 2000 hours at the maximum, featuring excellent quality and enjoying high trust from customers.
We adhere to the corporate culture of "Quality First, Customer Supreme", always insisting on technological innovation and process optimization, and are committed to providing customers with high-quality fastener products. The company's products are sold both at home and abroad and have won widespread market recognition.
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