Nominal diameter
d |
30 |
38 |
46 |
52 |
64 |
82 |
94 |
120 |
148 |
| d1
|
25~26.9 |
30~33.7 |
38~42.4 |
44.5~48.3 |
57~60.3 |
76.1 |
88.9 |
108~114.3 |
133~139.7 |
| d1
|
Suitable for pipe size |
Metric system |
20 |
25 |
32 |
40 |
50 |
65 |
80 |
100 |
125 |
| d1
|
English |
3/4" |
1" |
1 1/4" |
1 1/2" |
2" |
2 1/2" |
3" |
4" |
- |
| b ① |
40 |
40 |
50 |
50 |
50 |
50 |
50 |
60 |
60 |
| ds
|
10 |
10 |
10 |
10 |
12 |
12 |
12 |
16 |
16 |
| d3
|
M10 |
M10 |
M10 |
M10 |
M12 |
M12 |
M12 |
M16 |
M16 |
| L ① |
70 |
76 |
86 |
92 |
109 |
125 |
138 |
- |
- |
| L1
|
28 |
31 |
37 |
40 |
49 |
57 |
66 |
171 |
191 |
| n |
40 |
48 |
56 |
62 |
76 |
94 |
106 |
136 |
164 |
| 100 piece weight (steel) ≈ kg |
Type A |
9.4 |
10.5 |
12 |
12.9 |
22.2 |
25.9 |
28.8 |
64 |
72.7 |
| Type B |
6.8 |
7.7 |
9 |
9.7 |
16.8 |
19.8 |
22.4 |
- |
- |
Nominal diameter
d |
176 |
202 |
228 |
282 |
332 |
378 |
428 |
530 |
| d1
|
159~168.3 |
(191)~193.7 |
216~219.1 |
267~273 |
318~323.9 |
355.6~368 |
406.4~419 |
508~521 |
| d1
|
Suitable for pipe size |
Metric system |
150 |
-175 |
200 |
250 |
300 |
350 |
400 |
500 |
| d1
|
English |
- |
- |
- |
- |
- |
- |
- |
- |
| b ① |
60 |
60 |
70 |
70 |
70 |
70 |
70 |
70 |
| ds
|
16 |
16 |
20 |
20 |
20 |
24 |
24 |
24 |
| d3
|
M16 |
M16 |
M20 |
M20 |
M20 |
M24 |
M24 |
M24 |
| L ① |
- |
- |
- |
- |
- |
- |
- |
- |
| L1
|
217 |
249 |
283 |
334 |
385 |
435 |
487 |
589 |
| n |
192 |
218 |
248 |
302 |
352 |
402 |
452 |
554 |
| 100 piece weight (steel) ≈ kg |
Type A |
83.4 |
95.8 |
169.8 |
202.8 |
235 |
382 |
429 |
522 |
| Type B |
- |
- |
- |
- |
- |
- |
- |
- |
▶
Purpose, Shape & Application Areas of U-Bolts
U-bolt usage: mainly used for water pipes and other fixed pipe fittings or plates, such as the construction and installation of automotive steel plate springs, mechanical connections, vehicles, ships, bridges, tunnels, railways, etc.
Main shapes: semi-circular, right angled square, triangle, oblique triangle, etc.
The application areas of U-bolts are as follows: U-bolts are usually used in trucks to stabilize car chassis and frames. For example, leaf springs are connected by U-bolts. U-bolts have a wide range of applications, such as construction and installation, mechanical component connections, vehicles, ships, bridges, tunnels, railways, etc.
In addition, U-bolts have been widely used in modern industrial fields, easy to install, maintain, and replace, and have seismic performance and anti loosening function. When selecting and using U-bolts, factors such as material, density, strength, color, and compressive strength need to be considered to ensure that they can adapt to specific usage environments and requirements.
Automotive
Construction
Marine / Ships
Bridges & Tunnels
Railways
Mechanical Connections
FAQ
Frequently Asked Questions
Q
What is a DIN 3570 U-bolt and what is it primarily used for?
A DIN 3570 U-bolt is a U-shaped fastener with two threaded legs, standardized under the German DIN 3570 specification. It is primarily used to secure pipes, tubes, and hoses to support structures or plates. Common applications include automotive leaf spring assemblies, water pipe installation, mechanical connections, ships, bridges, tunnels, and railway systems.
Q
What is the difference between Type A and Type B DIN 3570 U-bolts?
According to the specification tables, Type A U-bolts are consistently heavier than Type B bolts of the same nominal diameter, indicating a thicker cross-section and greater load-bearing capacity. Type B is a lighter-duty variant and is only available for smaller nominal diameters (up to 94 mm), whereas Type A covers the full size range including large-diameter applications.
Q
What pipe sizes are compatible with DIN 3570 U-bolts?
DIN 3570 U-bolts support a wide range of pipe diameters. In the metric system, compatible pipe sizes range from DN20 up to DN500. In imperial sizing, compatible pipes range from 3/4 inch up to 4 inches. For larger diameters (DN150 and above), only metric sizing is listed in the standard specification tables.
Q
What shapes are available for DIN 3570 U-bolts?
U-bolts are manufactured in several shapes to suit different installation requirements: semi-circular (most common, for standard round pipes), right-angled square (for rectangular or square profiles), triangular, and oblique triangular. The shape should be selected based on the cross-section of the pipe or component being clamped and the structural configuration of the mounting bracket.
Q
What materials are DIN 3570 U-bolts typically made from?
DIN 3570 U-bolts are most commonly produced in carbon steel, with the weight data in the specification tables based on steel. They are also available in stainless steel (A2 or A4 grade) for corrosion-resistant applications and in hot-dip galvanized steel for outdoor or marine environments. Material selection should take into account factors such as load strength, density, compressive strength, environmental exposure, and chemical compatibility.
Q
How do I select the correct DIN 3570 U-bolt for my application?
Begin by measuring the outer diameter (d₁) of the pipe or component to be secured, then match it to the corresponding nominal diameter (d) in the specification table. Next, confirm that the thread size (d₃), leg length (L or L₁), and inner width (b) are compatible with your mounting bracket design. Finally, choose the appropriate material and type (A or B) based on the required load capacity, operating environment, and any seismic performance or anti-loosening requirements.
