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China Double-Headed Bolts Suppliers - Galvanized & Blackened Grade 4.8/8.8 Factory Products
| Thread size d |
M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 | |
| designation① | D | D | D | D | D | D | D | D | D | D | D | D | D | |
| / | / | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | D-HDZ | ||
| ds | Max | 5.32 | 7.16 | 8.99 | 10.83 | 12.66 | 14.66 | 16.33 | 18.33 | 20.33 | 22 | 25 | 27.67 | 30.67 |
| Min | 5.14 | 6.97 | 8.78 | 10.59 | 12.41 | 14.41 | 16.07 | 18.07 | 20.07 | 21.69 | 24.69 | 27.34 | 30.34 | |
| S | Public | 50 | 63 | 75 | 100 | 115 | 125 | 140 | 150 | 165 | 175 | 200 | 200 | 225 |
| Max | 75 | 88 | 100 | 125 | 140 | 150 | 165 | 175 | 190 | 200 | 225 | 225 | 250 | |
| Min | 42 | 55 | 67 | 92 | 107 | 117 | 132 | 142 | 157 | 167 | 192 | 192 | 217 | |
| Connecting nut | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 | |
The Function of Double Headed Bolts
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1. Connecting Mechanical Components Double headed bolts have threads at both ends and a screw in the middle, commonly used to connect mechanical components such as mining machinery, bridges, automobiles, motorcycles, boiler steel structures, suspension towers, large-span steel structures, and large buildings.
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2. Installation Accessories When large equipment requires the installation of accessories, such as observation mirrors, mechanical seal seats, reduction frames, etc., double headed bolts can play a role. One end is screwed into the main body, and after installing the accessories, the other end is equipped with a nut. Due to the fact that these attachments may require frequent disassembly, using double headed bolts for replacement would be very convenient.
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3. Connecting Thick Plates & Inconvenient Locations In cases where the thickness of the connectors is large or the connection area is not convenient to use hexagonal bolts, such as concrete roof trusses, roof beam suspensions, monorail beam suspensions, etc., double headed bolts are also a suitable choice.
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4. Fixed Connecting Rod Double headed bolts are also commonly used for mechanical fixed connecting rods, with corresponding threads at both ends. The thickness of the middle screw varies depending on actual usage.
Frequently Asked Questions
Q
What is a double headed bolt and how does it differ from a standard bolt?
A double headed bolt (also known as a stud bolt) features threads at both ends with a plain or threaded shank in the middle. Unlike a standard bolt that has a head on one end, a double headed bolt is designed to be screwed into a tapped hole on one side and secured with a nut on the other, making it ideal for applications requiring frequent disassembly.
Q
What thread sizes are available for double headed bolts?
Double headed bolts are available in a wide range of metric thread sizes, including M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, and M33, to accommodate various industrial and structural applications.
Q
What industries commonly use double headed bolts?
Double headed bolts are widely used across many industries including mining machinery, bridge construction, automotive and motorcycle manufacturing, boiler and steel structure fabrication, suspension towers, large-span steel structures, and large-scale building construction.
Q
What does the designation "D-HDZ" indicate on double headed bolts?
The designation "D-HDZ" refers to a specific surface treatment or product classification applied to double headed bolts from M10 size and above. It typically indicates hot-dip galvanized (HDZ) coating, which provides enhanced corrosion resistance for outdoor or harsh environment applications.
Q
Why are double headed bolts preferred for thick plate connections?
When connecting thick plates or in locations where standard hexagonal bolts cannot be conveniently inserted or turned, double headed bolts offer a practical solution. They are particularly useful in concrete roof trusses, roof beam suspensions, and monorail beam suspensions where access is limited and a through-bolt configuration is not feasible.
Q
Can double headed bolts be reused after disassembly?
Yes, one of the key advantages of double headed bolts is their suitability for repeated assembly and disassembly. Since one end remains permanently threaded into the base component, only the nut on the other end needs to be removed when accessing or replacing accessories, minimizing wear on the main structure and extending the service life of the fastener system.