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📌 DIN 3570 U-Bolt Dimensions — Small to Medium Sizes (mm)
| 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 | - | - | ||
📌 DIN 3570 U-Bolt Dimensions — Large Sizes (mm)
| 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.
Key Application Areas
- Used in trucks to stabilize car chassis and frames — leaf springs are connected by U-bolts.
- Construction and installation of structural components.
- Mechanical component connections in industrial equipment.
- Vehicles, ships, bridges, tunnels, and railways infrastructure.
- Modern industrial fields — easy to install, maintain, and replace.
- Provides seismic performance and anti-loosening function in demanding environments.
⚠ Selection Considerations: When selecting and using U-bolts, factors such as material, density, strength, color, and compressive strength need to be considered to ensure they can adapt to specific usage environments and requirements.
Frequently Asked Questions (FAQ)
Q
What is a DIN 3570 U-bolt used for?
DIN 3570 U-bolts are primarily used for securing water pipes and pipe fittings to surfaces or structures. They are widely applied in construction, automotive (e.g., leaf spring assemblies), mechanical engineering, vehicles, ships, bridges, tunnels, and railways.
Q
What are the available shapes of U-bolts?
U-bolts are available in several shapes to suit different applications, including semi-circular (round), right-angled square, triangular, and oblique triangular forms. The most common type for pipe clamping is the semi-circular shape.
Q
What is the difference between Type A and Type B U-bolts in DIN 3570?
Type A U-bolts are heavier and typically used for larger load-bearing applications, while Type B U-bolts are lighter. As shown in the dimension tables, Type A consistently has a higher weight per 100 pieces compared to Type B for the same nominal diameter. Type B is only available for smaller diameter sizes.
Q
What materials are DIN 3570 U-bolts made from?
DIN 3570 U-bolts are commonly manufactured in steel. When selecting U-bolts, it is important to consider material properties such as density, tensile strength, compressive strength, and corrosion resistance to ensure suitability for the intended environment.
Q
What pipe sizes are compatible with DIN 3570 U-bolts?
DIN 3570 U-bolts cover a wide range of pipe sizes. For metric pipes, compatible sizes range from DN20 (3/4") up to DN500. English pipe sizes from 3/4" to 4" are also supported for smaller nominal diameters. Refer to the dimension tables above for the exact d1 range corresponding to each nominal diameter.
Q
Do U-bolts provide anti-vibration or seismic resistance?
Yes. U-bolts are designed with seismic performance and anti-loosening functions, making them suitable for use in environments subject to vibration or dynamic loads. This makes them a reliable fastening solution in modern industrial applications such as pipeline systems, automotive assemblies, and structural engineering.