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Galvanized U-Bolts & Double Headed Bolts from China Suppliers - Custom Irregular U-Bolts from Factory
📐 Dimensions Table — Small to Medium Sizes
| 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 | - | - | ||
📐 Dimensions Table — Large Sizes
| 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
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Primary Usage
Mainly used for water pipes and other fixed pipe fittings or plates, including construction, mechanical connections, vehicles, ships, bridges, tunnels, and railways.
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Main Shapes
Semi-circular, right-angled square, triangle, oblique triangle, and more to suit various installation needs.
🚛
Automotive Applications
Commonly used in trucks to stabilize car chassis and frames. Leaf springs are connected by U-bolts for reliable performance.
🏗️
Wide Industry Use
Applied across construction, mechanical component connections, vehicles, ships, bridges, tunnels, and railway infrastructure.
U-bolts have been widely adopted in modern industrial fields due to their ease of installation, maintenance, and replacement. They also offer excellent seismic performance and anti-loosening function.
When selecting and using U-bolts, key factors such as material, density, strength, color, and compressive strength must be considered to ensure they adapt to specific usage environments and requirements.
❓ Frequently Asked Questions
Q
What is a DIN 3570 U-bolt used for?
DIN 3570 U-bolts are primarily used to fix water pipes, pipe fittings, and plates. They are widely applied in construction, automotive, mechanical, marine, bridge, tunnel, and railway installations.
Q
What shapes are available for U-bolts?
U-bolts are available in several shapes including semi-circular, right-angled square, triangle, and oblique triangle. The shape selected depends on the specific application and the pipe or component being secured.
Q
What is the difference between Type A and Type B U-bolts?
Type A U-bolts are heavier than Type B for the same nominal diameter, indicating a heavier-duty construction. Type B is a lighter variant and is typically available only for smaller pipe sizes (up to nominal diameter 94), while Type A covers the full size range.
Q
What materials are U-bolts made from?
U-bolts are commonly manufactured from steel. When selecting a U-bolt, important material considerations include density, strength, compressive strength, and corrosion resistance to ensure suitability for the intended environment.
Q
How do I select the correct U-bolt size for my pipe?
Select a U-bolt based on the nominal diameter (d) that corresponds to your pipe's outer diameter (d1). Both metric and imperial pipe size references are provided in the dimension tables above to help match the correct U-bolt to your pipe specification.
Q
Do U-bolts provide anti-loosening and seismic resistance?
Yes. U-bolts are designed with anti-loosening functionality and seismic performance, making them suitable for use in environments subject to vibration, mechanical stress, or seismic activity. Their simple design also allows for easy installation, maintenance, and replacement.