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China Suppliers Factory External Hexagonal Bolt DIN M8-M16 - High Strength Fasteners with Limitations
Dimensional Specifications — M10 to M24
| Thread specifications d | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | |
| P | Pitch | 1.50 | 1.75 | 2.0 | 2.0 | 2.5 | 2.5 | 2.5 | 3 |
| b | L≤125 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 |
| 125＜L≤200 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | |
| L＞200 | / | / | / | 57 | 61 | 65 | 69 | 73 | |
| ds | Max | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| Min | 9.64 | 11.57 | 13.57 | 15.57 | 17.57 | 19.48 | 21.48 | 23.48 | |
| e | Min | 19.68 | 22.58 | 25.94 | 29.3 | 32.66 | 36.96 | 39.2 | 44.8 |
| k | Max | 6.69 | 7.79 | 9.09 | 10.29 | 11.85 | 12.85 | 14.35 | 15.35 |
| Min | 6.11 | 7.21 | 8.51 | 9.71 | 11.15 | 12.15 | 13.65 | 14.65 | |
| s | Max | 18 | 21 | 24 | 27 | 30 | 34 | 36 | 41 |
| Min | 17.57 | 20.16 | 23.16 | 26.16 | 29.16 | 33 | 35 | 40 | |
| 1,000 pieces of steel weigh ≈ kg | - | - | - | - | - | - | - | - | |
Dimensional Specifications — M27 to M48
| Thread specifications d | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | |
| P | Pitch | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| b | L≤125 | 60 | 66 | 72 | 78 | 84 | 90 | 96 | 102 |
| 125＜L≤200 | 66 | 72 | 78 | 84 | 90 | 96 | 102 | 108 | |
| L＞200 | 79 | 85 | 91 | 97 | 103 | 109 | 115 | 121 | |
| ds | Max | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 |
| Min | 26.48 | 29.48 | 32.38 | 35.38 | 38.38 | 41.38 | 44.38 | 47.38 | |
| e | Min | 50.4 | 54.9 | 60.3 | 65.9 | 71.5 | 71.5 | 76.3 | 81.9 |
| Min | Min | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 26.42 | 28.42 | 30.42 |
| Min | Min | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | 25.58 | 27.58 | 29.58 |
| s | Max | 46 | 50 | 55 | 60 | 65 | 65 | 70 | 75 |
| Min | 45 | 49 | 53.8 | 58.8 | 63.8 | 63.8 | 68.1 | 73.1 | |
| 1,000 pieces of steel weigh ≈ kg | - | - | - | - | - | - | - | - | |
External hexagonal bolts are a common type of mechanical fastener, mainly used for connecting and fixing mechanical equipment.
External Hexagonal Bolts Are Commonly Used For
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Connecting Components The outer hexagonal bolt fixes multiple components together through the action of torque, forming a whole.
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Load Bearing Due to its high-strength design, the outer hexagonal bolt can withstand large loads and shear forces, and is not easy to break or loosen, ensuring the firmness of the connection.
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Easy Installation No special fixtures or tools are required during installation; it can be completed with a wrench, and the installation speed is fast, which can improve production efficiency.
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Wide Application Range External hexagonal bolts are suitable for various connection situations, such as heavy machinery, construction, and bridge engineering, and can meet various connection requirements.
Frequently Asked Questions
❓ What are external hexagonal bolts used for?
External hexagonal bolts are widely used in mechanical engineering, construction, and bridge engineering to connect and fix components together. They can withstand large loads and shear forces, making them suitable for heavy-duty applications.
❓ What thread sizes are available for external hexagonal bolts?
External hexagonal bolts are available in a wide range of thread sizes, from M10 up to M48 and beyond. Common sizes include M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39, M42, M45, and M48.
❓ What tools are needed to install external hexagonal bolts?
No special fixtures are required. External hexagonal bolts can be installed using a standard wrench or socket wrench. This makes them easy to install and remove, improving overall production and maintenance efficiency.
❓ How does the thread pitch vary with bolt size?
Thread pitch increases with bolt diameter. For example, M10 bolts have a pitch of 1.50 mm, M12 bolts have 1.75 mm, M14–M16 have 2.0 mm, and bolts from M18 onwards typically have a pitch of 2.5 mm or 3.0 mm, as shown in the specification tables above.
❓ How is the thread engagement length (b) determined?
The thread engagement length (b) depends on both the bolt diameter and the total bolt length (L). Three ranges apply: L≤125 mm, 125＜L≤200 mm, and L＞200 mm. Longer bolts require greater thread engagement to ensure a secure and stable connection.
❓ Are external hexagonal bolts suitable for heavy machinery and construction?
Yes. External hexagonal bolts are specifically designed with high-strength materials and precise dimensional tolerances, making them ideal for heavy machinery, structural steel connections, bridge engineering, and other demanding industrial applications where reliability and load-bearing capacity are critical.