U-Bolts Manufacturer
MT.BOLTS manufactures U-Bolts, which are U-shaped externally threaded fasteners designed to secure piping, tubing, or round objects to a surface or structure. Featuring two threaded arms and a smooth or notched curve, U-Bolts are widely used in industries such as construction, automotive, plumbing, and marine. MT.BOLTS provides high-performance U-Bolts in a variety of materials, sizes, coatings, and industry standards to meet demanding load and corrosion requirements.
- System of Measurement:
Metric (M6–M36) | Imperial (1/4″ to 1 1/2″) - Length Range:
- Metric: 30 mm to 500 mm
- Imperial: 1.25″ to 20″
- Thread Pitch:
Metric (Coarse) | UNC - Thread Type:
Partial thread on both legs - Bend Types:
- Round bend (for piping/tubing)
- Square bend (for flat bar or framing)
- Semi-round
- Finish Options:
Plain, zinc-plated, hot-dip galvanized, black oxide, passivated, or custom coatings - Standards:
- ASME B18.31.5 – U-Bolts
- DIN 3570 – U-Bolts for tubes
- Custom/OEM dimensions also available
U-Bolts Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy U-Bolts, meeting the demanding requirements of chemical, marine, and high-temperature environments, compliant with various international standards.
| Material Category | Common Grades/Models | Description |
| Carbon Steel | ASTM A307, A325, A490 | High strength and cost-effective, suitable for general structures; requires anti-corrosion coating. |
| Stainless Steel | 304 (A2), 316 (A4), 321, 410 | Excellent corrosion resistance; widely used in food, chemical, and construction industries |
| Duplex Stainless Steel | UNS S31803/S32205 (F51), UNS S32750 (F53) | High strength with superior chloride corrosion resistance; used in seawater, petrochemical, and paper industries |
| Monel Alloys | Monel 400, Monel K500 | Excellent seawater corrosion resistance and mechanical strength; used in marine engineering and pump systems |
| Hastelloy Alloys | Hastelloy C276, C22, B2, X | Excellent resistance to strong acids and oxidizing media; widely used in chemical equipment and flue gas desulfurization |
| Inconel Alloys | Inconel 600, 625, 718 | Resistant to high temperature, pressure, and corrosion; used in heat exchangers, aerospace, and nuclear industries |
| Incoloy Alloys | Incoloy 800, 825, 925 | Ideal for high-temperature acidic environments; widely used in petroleum refining and heat treating systems |
| Nickel Alloys | Nickel 200, 201 | Pure or high-nickel alloys with excellent conductivity and alkali resistance; used in electronics and chemical applications |
U-Bolts System of Measurement
- Metric Sizes: M6 to M36
- Imperial Sizes: 1/4″ to 1.5″
- Leg lengths vary from 30 mm to 500 mm (1.25″ to 20″)
- Bend Types:
- Round bend (for piping/tubing)
- Square bend (for flat bar or framing)
- Semi-round
U-Bolts Common Standards
- ASME B18.31.5 – Standard for U-Bolts
- DIN 3570 – U-Bolts for tubes and piping
- Custom/OEM standards – available per request
U-Bolts Surface Finishes
- Zinc-plated – Corrosion resistance in indoor environments
- Hot-dip galvanized – Excellent protection in outdoor/marine use
- Black oxide – Mild corrosion resistance, often for aesthetic or indoor use
- Passivated – Used on stainless steel bolts to improve corrosion resistance
- Custom Coatings (e.g., PTFE) – Non-stick, chemical-resistant for harsh environments
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of U-Bolts
Advantages
- Secure attachment of round objects like pipes or tubes
- Available in various bend types (round, square, semi-round)
- Suitable for high-load and vibration-prone applications
- Easy installation and removal
Disadvantages
- Requires pre-drilled mounting holes or brackets
- May loosen under thermal cycling without lock nuts
- Not ideal for flat surfaces unless using square bend type
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U-Bolts Applications
- Pipe and tube support in plumbing, oil & gas, and HVAC
- Suspension systems in automotive and trailers
- Securing conduits, cables, or antennas
- Marine and offshore structural fastening
- Mounting poles and signs in infrastructure
FAQ About U-Bolts
Round bend is ideal for pipes/tubes; square bend suits flat bars or channels.
Yes, if made from high-temp alloys or stainless steel.
Washers and saddle plates improve load distribution and stability, especially for piping.
Stainless steel (316/304), hot-dip galvanized, or coated U-bolts are preferred.
Yes, MT.BOLTS offers OEM and custom-manufactured U-bolts to fit project-specific needs.
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