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High-Quality M8-M16 External Hexagonal Bolts from China Suppliers and Factory - Ideal for Various Applications
| 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 | - | - | - | - | - | - | - | - | |
| 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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1
Connecting Components The outer hexagonal bolt fixes multiple components together through the action of torque, forming a whole.
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2
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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3
Easy Installation No special fixtures or tools are required during installation, it can be completed with a wrench or wrench, and the installation speed is fast, which can improve production efficiency.
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4
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
Q
What is an external hexagonal bolt and how does it differ from other bolt types?
An external hexagonal bolt (hex bolt) features a six-sided head that allows tightening with a standard wrench or socket. Unlike internal hex (Allen) bolts, the external hex design enables greater torque application and is better suited for heavy-load structural connections where high clamping force is required.
Q
What materials are external hexagonal bolts typically made from?
They are commonly manufactured from carbon steel, alloy steel, or stainless steel. Carbon steel is used for general-purpose applications, alloy steel provides higher tensile strength for demanding industrial environments, and stainless steel offers excellent corrosion resistance for outdoor or marine use.
Q
How do I select the correct thread size (M10–M48) for my application?
Selection depends on load requirements, material thickness, and available clearance. Larger diameters such as M36–M48 are designed for heavy structural connections like bridges and large machinery, while smaller sizes like M10–M16 are appropriate for lighter assemblies. Always consult relevant load tables and engineering standards for your specific application.
Q
What does the pitch value (P) indicate in the specification table?
Pitch (P) is the distance between adjacent thread crests, measured in millimeters. A larger pitch means coarser threads with fewer threads per unit length, generally allowing faster installation. The pitch values in the table range from 1.50 mm for M10 bolts up to 3 mm for M27 and larger sizes.
Q
What does the "b" dimension represent and why does it vary with bolt length?
The "b" dimension represents the thread length of the bolt. It increases with the overall bolt length (L) to maintain sufficient thread engagement: shorter bolts (L≤125 mm) have a shorter threaded section, while longer bolts (L>200 mm) require a longer threaded section to ensure reliable connection strength.
Q
In which industries are external hexagonal bolts most commonly used?
External hexagonal bolts are widely used in construction (structural steel framing), bridge engineering, heavy machinery manufacturing, automotive assembly, shipbuilding, and general infrastructure projects. Their high load-bearing capacity and ease of installation with standard tools make them a preferred fastener wherever reliable, removable connections are required.