M6 M8 Stainless Steel 304 U - Bolt with Plate and Nuts — Multiple Sizes - HomeDIYer

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M6 M8 Stainless Steel 304 U-Bolt with Plate and Nuts — Multiple Sizes

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Size: M6x35x85

Amount: 1pcs

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$3.98 USD

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In stock (500 units), ready to be shipped

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M6 M8 Stainless Steel 304 U-Bolt with Plate and Nuts — Secure Any Pipe or Tube with Confidence

Whether you're building a trailer rack, securing conduit runs in a workshop, or replacing corroded hardware on a boat, finding a U-bolt that fits precisely and holds up over time is harder than it should be. Undersized bolts slip; oversized ones leave gaps that vibrate loose. These M6 M8 stainless steel 304 U-bolts are designed for DIYers, fabricators, and tradespeople who need a reliable, correctly sized fastener the first time.

Each set includes one U-bolt, one flat mounting plate, and two hex nuts — a complete installation kit in one package. Available in M6 and M8 thread diameters with inner widths ranging from 25mm (≈1") to 90mm (≈3-1/2") and leg lengths from 70mm (≈2-3/4") to 160mm (≈6-1/4"), these U-bolts cover a wide range of pipe and tube sizes. All hardware is machined from Grade 304 stainless steel for consistent thread engagement and long-term durability. Order in quantities of 1, 2, 4, or 10 complete sets.

Typical applications include trailer axle and spring U-bolt replacement, pipe and conduit clamping in outdoor or industrial settings, truck rack and roll bar mounting, and securing round tubing on marine or agricultural equipment. Long-tail searches like "M8 U-bolt with plate for trailer" and "stainless steel pipe clamp bolt metric" describe exactly what this hardware is built for.

🔩 Compatibility: Fits standard metric M6 and M8 threaded applications. Inner width matches pipe or tube OD — verify your tube's outer diameter before selecting a size. Included nuts are standard metric coarse thread.

✅ Key Features of These Stainless Steel 304 U-Bolts with Plate and Nuts

🦾Grade 304 Stainless Steel Construction — Resists rust, oxidation, and surface corrosion in outdoor, trailer, and light marine environments without surface coatings that can chip or peel.
📐12 Size Combinations Available — From compact M6x25x70 (≈1"×2-3/4") to heavy-duty M8x90x160 (≈3-1/2"×6-1/4"), covering a wide range of pipe diameters and mounting depths for trailer, rack, and conduit work.
🔧Complete Hardware Set Included — Each unit ships with the U-bolt, a flat mounting plate, and two matching hex nuts, so you can install immediately without sourcing additional fasteners.
⚙️Consistent Metric Coarse Thread — M6 and M8 threads are cut to standard metric pitch, ensuring smooth nut engagement and compatibility with common metric wrenches and sockets.
📦Flexible Quantity Options — Available in 1, 2, 4, or 10-piece sets, making it practical to buy exactly what you need for a single repair or stock up for a larger fabrication project.
🚛Designed for Trailer and Structural Clamping — The U-bolt profile and plate design are well-suited for securing round tubing, pipe, and bar stock to frames — a common need in trailer builds, truck accessories, and outdoor equipment mounting.

📐 Technical Specifications — Stainless Steel U-Bolt with Plate and Nuts

Material	Grade 304 Stainless Steel
Thread Sizes	M6, M8 (metric coarse thread)
Available Inner Widths	25mm (≈1"), 33mm (≈1-5/16"), 35mm (≈1-3/8"), 40mm (≈1-9/16"), 45mm (≈1-3/4"), 50mm (≈2"), 60mm (≈2-3/8"), 65mm (≈2-9/16"), 90mm (≈3-1/2")
Available Leg Lengths	70mm (≈2-3/4"), 85mm (≈3-3/8"), 100mm (≈3-15/16"), 110mm (≈4-5/16"), 120mm (≈4-3/4"), 155mm (≈6-1/8"), 160mm (≈6-5/16")
Included Hardware	1× U-bolt, 1× flat mounting plate, 2× hex nuts (per set)
Quantity Options	1 pcs, 2 pcs, 4 pcs, 10 pcs (complete sets)
Thread Standard	Metric coarse (standard pitch)
Finish	Natural stainless (no coating)
Corrosion Resistance	Suitable for outdoor and light marine use
Recommended Use	Trailers, pipe clamping, truck racks, outdoor equipment
Load Rating	See variant options — varies by thread size and leg length
Country of Origin	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right U-bolt size for my application?

Measure the outer diameter (OD) of the pipe, tube, or bar you need to clamp — the U-bolt inner width should match or be very slightly larger than that OD. The thread diameter (M6 or M8) indicates bolt strength; M8 is generally used for heavier loads. The leg length determines how much thread protrudes through the mounting plate — make sure it is long enough to fit the plate and both nuts with at least 3 full threads remaining. For example, M6x35x85 means M6 thread, 35mm (≈1-3/8") inner width, 85mm (≈3-3/8") leg length.

What does the size notation like M6x35x85 mean?

The three numbers represent: thread diameter × inner width × leg length, all in millimeters. So M6x35x85 = 6mm thread, 35mm (≈1-3/8") inner width, 85mm (≈3-3/8") leg length. Always verify all three dimensions against your mounting surface and the pipe or tube OD before ordering.

What load can these U-bolts handle?

Load capacity depends on thread size, leg length, and installation torque. M6 U-bolts are generally suited for light-to-medium duty clamping, while M8 U-bolts handle heavier structural loads. For safety-critical applications such as suspension or overhead support, consult an engineer and verify torque specifications. These U-bolts are not rated for overhead lifting.

Are these U-bolts suitable for outdoor or marine use?

Yes. Grade 304 stainless steel provides solid corrosion resistance in most outdoor environments, including rain, humidity, and mild salt air. For highly aggressive marine environments with constant saltwater immersion, 316 stainless steel is typically recommended. These U-bolts are well-suited for trailers, outdoor pipe runs, and general exterior hardware applications.

What thread standard do these U-bolts use — are they compatible with standard nuts?

These U-bolts use standard metric coarse threads (M6 or M8). The included nuts are matched to the same thread pitch, so no additional hardware is needed for basic installation. If you need replacement nuts, use standard M6 or M8 metric hex nuts available at any hardware store.

What is included with each U-bolt set?

Each set includes one U-bolt, one flat mounting plate, and two hex nuts — everything needed for a complete installation. The quantity option (1, 2, 4, or 10 pieces) refers to the number of complete sets, not individual components.

Can I use these U-bolts on a trailer or truck rack?

Yes — these are commonly used for trailer pipe clamps, truck rack mounting, and securing round tubing or conduit to frames. Select the size whose inner width matches the tube OD on your trailer or rack. For vibration-prone applications, consider adding a lock washer or thread-locking compound to prevent loosening over time.

🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.

M6 M8 Stainless Steel 304 U-Bolt with Plate and Nuts — Multiple Sizes

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M6 M8 Stainless Steel 304 U-Bolt with Plate and Nuts — Secure Any Pipe or Tube with Confidence

✅ Key Features of These Stainless Steel 304 U-Bolts with Plate and Nuts

📐 Technical Specifications — Stainless Steel U-Bolt with Plate and Nuts

❓ Frequently Asked Questions

M6 M8 Stainless Steel 304 U-Bolt with Plate and Nuts — Multiple Sizes

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