A U-bolt is a bolt in the shape of the letter U with screw threads on both ends.
U-bolts have primarily been used to support pipework, pipes through which fluids and gasses pass. As such, U-bolts were measured using pipe-work engineering speak. A U-bolt would be described by the size of pipe it was supporting. U-bolts are also used to hold ropes together.
For example, a 40 Nominal Bore U-bolt would be asked for by pipe work engineers, and only they would know what that meant. In reality, the 40 nominal bore part bears little resemblance to the size and dimensions of the U-bolt.
The nominal bore of a pipe is actually a measurement of the inside diameter of the pipe. Engineers are interested in this because they design a pipe by the amount of fluid / gas it can transport.
As U-bolts are now being used by a much wider audience to clamp any kind of tubing / round bar, then a more convenient measurement system needs to be used.
Four elements uniquely define any U-bolt:
1.Material type (for example: bright zinc-plated mild steel)
2.Thread dimensions (for example: M12 * 50 mm)
3.Inside diameter (for example: 50 mm - the distance between the legs)
4.Inside height (for example: 120 mm)
Item | China high quality U bolts with nuts hot-dip galvanized | |||||||
Application | industries,constructions,electrical,powers | |||||||
system of measurement | Metric | |||||||
material | Steel | |||||||
Grade | 4.8,5.8,6.8,8.8,10.9,12.9 | |||||||
Standard | ISO | |||||||
Surface | Hot-dip galvanized | |||||||
Size | M3, M4, M5, M6, M7, M8 | |||||||
Length | 20-80MM | |||||||
Certificate | ISO9001-2008 | |||||||
Customization | Provided | |||||||
Single packaging size | 25*25*16cm | |||||||
Singe gross weight | 25kg | |||||||
Sample | Free | |||||||
Packing | Carton+plastic bags | |||||||
(1)Small box packging | ||||||||
(2)25-30kgs/ctn in bulk, 36-48cartons/pallet | ||||||||
(3)Assortment in poly bag or plastic box | ||||||||
Delivery time | Quantity | Delivery time | ||||||
1-1000pcs | 3 days | |||||||
1001-5000pcs | 7 days | |||||||
5001-10000pcs | 9 days | |||||||
>10000pcs | To be negotiated | |||||||




Wuxi Zhuocheng Mechanical Components Co., Ltd. is established in 1993, and one group of manufacturing and selling professional fastener , and often make DIN, ANSI, BS, ISO, JIS standard and high quality and professional fastener products in industrial fields, also have a professional quality control in development, process and manufacturing of various non-standard fastener. At present we develop 10,000 kinds of non-standard fasteners. We have a long-term business cooperation relationship with many well-known multinational companies, and provide an OEM service for the middle- big business enterprise. The products have already exported to the Unite States, Germany, England, Canada, Italy, Japanese etc.









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◉ You are a manufacturing company or trading company?
---We are a metal alloy manufacturing and we have years of export experience. we have a reasonable price.
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◉ What is the quality of your products guarantee?
---We have passed ISO9001:2008 Quality Management System Certification, CQM Quality Management System Certification and IQNet Quality Management System Certification, If the quality doesn't accord with the standard, you can exchange the goods for free.
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