Product Details
Standard U-Bolts are shaped like the letter “U” with threaded ends, designed to clamp pipes, tubes, cables, or round objects to a support surface. They are essential components in plumbing, automotive exhaust systems, electrical conduit mounting, and structural steel connections.
At Yuanpai Fastener, we manufacture standard U-bolts to precise dimensional tolerances using high-quality carbon steel and alloy steel. Our U-bolts are available in a wide range of inner widths (from the center of bend to center of leg), leg lengths, thread diameters, and material grades. We also offer multiple surface finishes to match environmental requirements.
Whether you need U-bolts for pipe hangers in a commercial building, leaf spring clamps in heavy trucks, or custom non-standard dimensions, our production line can deliver.
Related sub-brands: Qinggang (standard), Changgu (high-strength), Wolf Warrior (HDG anti-corrosion), Mingyang (Dacromet coating)
Key Features
U-shape design – Perfect for clamping cylindrical or rounded objects
Threaded legs – Used with nuts and washers to provide adjustable clamping force
Available bent to round or square – Round bend for pipes/tubes, square bend for rectangular profiles
Precise bend radius – Consistent internal width and leg alignment
Thread length options – Fully threaded or partial thread on legs
Multiple material grades – From mild steel (4.8) to high-strength (8.8, 10.9)
Various coatings – Plain, zinc plated, HDG, Dacromet, mechanical zinc
Custom sizes welcome – We can produce non-standard inner widths, leg lengths, and diameters
Types of Standard U-Bolts
| Type | Shape Description | Typical Use |
|---|---|---|
| Round bend U-bolt | Semi-circular bend | Pipes, tubes, conduits, cables |
| Square bend U-bolt | 90° square corners | Square tubing, rectangular beams, channels |
| Long tangent U-bolt | Longer straight legs | Thicker pipe insulation, heavy-duty clamping |
| Short tangent U-bolt | Short legs after threads | Space-limited applications |
Most standard U-bolts are of the round bend type. We produce both.
Technical Specifications
| Parameter | Details |
|---|---|
| Thread diameter (d) | M6 – M30 (most common: M8, M10, M12, M16, M20) |
| Inner width (W) | 20mm – 300mm (distance between legs, inside) |
| Leg length (L) | 30mm – 500mm (from top of bend to end of leg) |
| Bend radius (R) | Matches pipe/tube OD (custom) |
| Thread length | Usually 2x diameter or as specified |
| Grades | 4.8, 8.8, 10.9 (12.9 on request) |
| Materials | Carbon steel (Q235, 35#, 45#), Alloy steel (40Cr, 35CrMo) for high strength |
| Standards | DIN 3570, ASME B18.31.5, or custom per drawing |
| Surface finishes | Plain (black), zinc plated (blue-white/yellow), HDG, Dacromet, mechanical zinc, phosphate |
| Packaging | 10–50 pieces per carton, then pallet; or bulk in 25kg bags |
Available Grades & Applications
| Grade | Tensile Strength (MPa) | Typical Application |
|---|---|---|
| 4.8 | 400 MPa | Light-duty pipe support, electrical conduit, non-critical clamping |
| 8.8 | 800 MPa | General industrial piping, exhaust systems, leaf spring clamps, structural pipe hangers (most common) |
| 10.9 | 1000 MPa | Heavy truck suspensions, mining equipment, high-load pipe clamping |
For Grade 8.8 and above, heat treatment ensures consistent hardness and strength. Our Changgu sub-brand can supply high-strength U-bolts.
Surface Finish Options & Benefits
| Finish | Corrosion Resistance | Recommended Use |
|---|---|---|
| Plain (black) | Low (indoor only) | Temporary or dry environment clamping |
| Zinc plated (blue-white) | Moderate (72–120 hrs salt spray) | General indoor plumbing, machinery, automotive (mild exposure) |
| Yellow zinc | Moderate | Visible installations, slight decorative need |
| Hot-dip galvanized (HDG) | High (500–1000+ hrs) | Outdoor pipe racks, water treatment plants, bridges, marine adjacent |
| Dacromet | Very high (500–1000 hrs) | High-strength, hydrogen embrittlement-free, eco-friendly (rail, wind) |
| Mechanical zinc | Good | Coating without hydrogen risk for high-strength U-bolts |
Related sub-brands: Wolf Warrior (HDG), Mingyang (Dacromet), Jin'an (zinc plating)
Which Sub-Brand Should You Choose for U-Bolts?
| Requirement | Recommended Sub-brand |
|---|---|
| Standard carbon steel U-bolts, large quantity | Jinlu 21 or Qinggang |
| High-strength U-bolts (Grade 8.8/10.9) | Changgu |
| Outdoor / corrosive environment | Wolf Warrior (HDG) |
| High-strength + hydrogen embrittlement risk | Mingyang (Dacromet) |
| Decorative or bright finish | Jin'an (blue-white zinc) or Steel Screw (color zinc – less common for U-bolts but possible) |
Applications
Standard U-bolts are used in numerous industries and scenarios:
Plumbing & Pipe Support
Suspending pipes from ceilings or beams
Attaching pipes to walls or channels
Automotive
Leaf spring clamping on trucks and trailers
Exhaust pipe hangers
Drive shaft support loops
Electrical & Cable Tray
Securing cable trays and conduits
Holding electrical conduit to strut channels
Construction & Steel Structures
Fixing round steel members to structural frames
Railings and handrail attachments
Marine & Offshore
Pipe clamping on shipboard systems (with HDG or Dacromet)
Solar Farms
Mounting round poles or torque tubes for solar trackers
General Industry
Clamping cylinders, air lines, hydraulic tubes
Quality Assurance
All Yuanpai standard U-bolts are manufactured under ISO 9001, ISO 14001, ISO 45001 certified systems. Our quality control includes:
Dimensional check – Inner width, leg length, thread diameter, bend radius
Thread gauge inspection (go/no-go on threaded legs)
Hardness test (for Grade 8.8 and above)
Tensile test (on sample bolts)
Coating thickness measurement (for plated/HDG finishes)
Salt spray test (upon request)
We can supply material test certificates (EN 10204 3.1) and third-party inspection reports (SGS, BV, TÜV) when required.
Custom & Non-Standard U-Bolts
Do you need a non-standard inner width, longer leg, thicker diameter, or special material? We specialize in custom U-bolts.
Please provide:
Thread size (d)
Inner width (W)
Leg length (L)
Bend radius or pipe OD
Grade / material
Surface finish
Quantity
Our engineering team will reply with a drawing for approval before production.
Packaging & Delivery
Small orders: Plastic bags + carton + label
Bulk orders: 25kg carton or steel pallet, stretch-wrapped
Marking: Product size, grade, finish, quantity, heat number (if requested)
Lead time:
Stock sizes (common M8–M20, widths 40–150mm): 7–15 days
Custom sizes: 20–30 days (depending on quantity and coating)
Ordering Example
*U-bolt, round bend, DIN 3570 equivalent. Thread M12 × inner width 76mm × leg length 120mm. Grade 8.8, hot-dip galvanized (HDG). Quantity: 5,000 pcs. Packing: 25 pcs per carton, labeled with size.*
Why Choose Yuanpai Fastener for Standard U-Bolts?
✅ Wide size range – M6 to M30 diameters, widths up to 300mm
✅ Multiple grades – 4.8 / 8.8 / 10.9 to match load requirements
✅ Flexible coatings – Plain, zinc, HDG, Dacromet, mechanical zinc
✅ Custom bending – No minimum quantity for custom runs (subject to tooling)
✅ Large inventory – 70,000 tons total stock, including popular U-bolt sizes
✅ Fast production – 800 tons daily output across all products
✅ Global shipping – Containers loaded at our facility in Yongnian, Handan
Request a Quote for U-Bolts
Tell us your dimensions, grade, finish, and quantity.
📧 Email: yuanpaifastener@gmail.com
📞 Phone / WhatsApp: +86 18531009807 | +86 18531007875
Yuanpai Manufacturing – Fasten the World. From Source to Global.