Products Description

U-bolts are U-shaped fasteners designed to securely hold pipes, tubes, cables, or round structures in place. They are widely used in construction, automotive, plumbing, marine, and industrial applications where reliable clamping and support are required.

For example, when installing a water pipe on a wall or securing an exhaust pipe underneath a truck, a U-bolt can firmly clamp the pipe to a bracket and prevent movement caused by vibration or external forces.

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Basic Product Information

Product Name: U-bolts, U-shaped bolts, U-shaped pipe clamps, saddle bolts
Standards: Available in accordance with JB/ZQ 4321, GB/T 3287, or custom-made to non-standard specifications
Common Strength Grades: Grade 4.8 / Grade 8.8
Common Materials:

Carbon Steel: Q235B, Q355B, 45# Steel

Stainless Steel: SUS304 (A2-70), SUS316 (A4-70)

Surface Treatment:

Carbon Steel: Galvanized (blue-white zinc / colored zinc), blackened, hot-dip galvanized

Stainless Steel: Natural finish, pickled and passivated

Structure: Round bar bent into a U-shape, with threads machined at both ends; used with nuts, flat washers, and spring washers

Functions of U-Bolts

1. Fastening: U-bolts are primarily used to secure two or more objects together, preventing relative movement. They are mainly used to secure two or more objects together, preventing relative movement and ensuring the stability and safety of the structure.

2. Load-bearing Capacity: Due to their unique shape, U-bolts offer a large contact area and high load-bearing capacity, making them suitable for use under high pressure and heavy loads.

3. Environmental Adaptability: U-bolts can be designed to meet the requirements of different environments; for example, stainless steel versions are suitable for corrosive environments, while galvanized versions are ideal for outdoor projects.

Typical Applications

Piping Systems: Fire protection piping, drainage piping, and fixed supports and hangers for chemical process piping
Renewable Energy (PV): Reinforcement of PV mounting columns and crossbeams, solar power plants
Vehicles and Machinery: Truck chassis, leaf springs for trailers, and agricultural machinery
Steel Structure Buildings: Factory steel beams, column tie-ins, guardrail reinforcement
Municipal Roads and Bridges: Bridge pipelines, streetlight poles, traffic barrier fastenings
Corrosion-Resistant Applications: 316 stainless steel models recommended for coastal areas and chemical plant sites

Common Size Chart (Sorted by Pipe Diameter) (Unit: mm)

1) Common pipe diameters and corresponding U-bolt sizes

Applicable pipe diameter DN	Outer diameter of round pipe D	Screw diameter d	Inner width of U-shaped opening W	Thread length range
DN15	21.3	M6 / M8	25	30–80
DN20	26.9	M6 / M8	30	30–80
DN25	33.7	M8 / M10	38	40–100
DN32	42.4	M8 / M10	48	40–100
DN40	48.3	M10 / M12	55	50–120
DN50	60.3	M10 / M12	68	50–120
DN65	76.1	M12 / M14	85	60–150
DN80	88.9	M12 / M14	100	60–150
DN100	114.3	M14 / M16	125	80–200
DN125	139.7	M16 / M18	150	100–200
DN150	165.0	M16 / M20	180	100–200

2) Common screw diameter series

M6, M8, M10, M12, M14, M16, M18, M20

Installation Tips

Select U-bolts that match the pipe diameter; ensure they fit snugly against the pipe wall without any gaps.
When tightening, apply even pressure to both nuts to prevent deformation caused by uneven tightening on one side.
Do not weld or cut outdoor galvanized parts; if the protective coating is damaged, repaint the area.
For equipment subject to vibration, we recommend installing spring washers and using double nuts.

FAQ

Can U-bolts secure square tubing?

Yes. We support custom bending radii and opening dimensions for both round and square tubing.

How do I choose between hot-dip galvanized and stainless steel?

For general outdoor use, choose hot-dip galvanized. For coastal areas or environments with acid or alkali corrosion, prioritize 304/316 stainless steel.

Can you manufacture based on provided drawings?

Yes. Simply provide CAD drawings, and we can proceed with mold production.

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