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

Yes. 304 (A2) stainless steel offers good corrosion resistance in most outdoor environments, including light coastal exposure. For highly aggressive marine or chemical environments, 316 stainless steel is typically recommended. The black finish on these bolts is a surface treatment; the underlying 304 alloy provides the corrosion protection.

What is the difference between the leg length and the inner width in the size designation?

In the size format M×[leg length]mm×[inner width]mm, the first number after M is the thread diameter, the second is the usable leg length (the threaded portion that passes through the mounting plate), and the third is the inner span of the U — the space between the two legs. For example, M8×60mm×100mm has 60mm legs and a 100mm (≈3.9″) inner gap.

Black Square U - Bolts 304 Stainless Steel Fixing Clamp — M6 M8 M10 - HomeDIYer

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Black Square U-Bolts 304 Stainless Steel Fixing Clamp — M6 M8 M10

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Size: M6×20mm×50mm

Amount (Pcs): 5 Pcs

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Black Square U-Bolts in 304 Stainless Steel — Secure Any Pipe, Conduit, or Beam Without Rust

Whether you are strapping conduit to a wall stud, anchoring exhaust pipe under a vehicle, or fastening structural tubing on a trailer frame, a corroded or undersized U-bolt is the last thing you want to discover mid-project. These black 304 A2 stainless steel square U-bolts are built for builders, fabricators, and serious DIYers who need a reliable metric fixing clamp that holds its finish and its grip over time.

Each set includes square U-bolts machined from 304 (A2) stainless steel with a black surface treatment. Thread diameters span M6, M8, and M10 with leg lengths from 20mm (≈0.8") to 150mm (≈5.9") and inner widths from 50mm (≈2.0") to 200mm (≈7.9"), covering a wide range of pipe and structural member sizes. Packs are available in 1, 2, 4, or 5 pieces depending on the variant selected.

Typical use cases include securing water supply pipe and electrical conduit in residential and commercial construction, clamping exhaust or roll-cage tubing in automotive and motorsport fabrication, and fixing handrails or structural square tube in outdoor furniture and equipment builds — all situations where a metric U-bolt clamp with corrosion resistance is the right call.

⚠️ Sizing note: The size format is M[thread] × [leg length]mm × [inner width]mm. Measure the outer diameter of your pipe or beam and select an inner width with 2–5mm clearance. If you are unsure, contact us before ordering.

🔩 Compatible with: Standard metric coarse-thread nuts and washers (M6×1.0 / M8×1.25 / M10×1.5) — DIN 934 hex nuts, DIN 125 washers, and standard U-bolt mounting plates.

✅ Key Features of These Black Stainless Steel Square U-Bolts

🔲Square-Bend Geometry — The 90° square profile prevents the bolt from rotating in the mounting plate, giving you a more stable clamp than round-bend U-bolts on flat or rectangular surfaces.
🛡️304 A2 Stainless Steel Core — The 18-8 chromium-nickel alloy resists oxidation and general corrosion in outdoor, humid, and mildly corrosive environments, making these suitable for long-term exterior installations.
🖤Black Surface Finish — The black treatment reduces glare and gives a clean, finished look on visible installations such as handrail brackets, conduit runs, and exposed structural clamps.
📐Wide Size Range — M6 to M10 — With 49 size combinations across M6, M8, and M10 thread diameters and inner widths from 50mm to 200mm, you can find the right metric U-bolt clamp for pipe, conduit, tubing, and structural members in one listing.
🔧Standard Metric Threads — Coarse metric threads (M6×1.0, M8×1.25, M10×1.5) are compatible with off-the-shelf DIN nuts and washers, so you are not locked into proprietary hardware.
📦Flexible Pack Quantities — Order 1, 2, 4, or 5 pieces per variant to match your project scope without over-buying. Larger sizes are available in single-piece packs; smaller sizes come in multi-piece sets.

📐 Technical Specifications — Square U-Bolt Fixing Clamp

Material	304 (A2) Stainless Steel
Surface Finish	Black (oxidation / coating treatment)
Thread Diameters	M6, M8, M10
Thread Pitch	M6×1.0 mm / M8×1.25 mm / M10×1.5 mm (metric coarse)
Leg Length Range	20mm (≈0.8") – 150mm (≈5.9")
Inner Width Range	50mm (≈2.0") – 200mm (≈7.9")
Bend Style	Square (90° corners)
Compatible Standards	DIN 934 hex nuts / DIN 125 washers
Pack Quantity Options	1 Pcs / 2 Pcs / 4 Pcs / 5 Pcs (varies by size variant)
Corrosion Resistance	Good — suitable for outdoor and light coastal use; not recommended for heavy marine or chemical exposure
Nuts / Washers Included	See variant options
Country of Origin	Contact us to confirm

❓ Frequently Asked Questions

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

Match the thread diameter (M6, M8, or M10) to your nut and plate requirements, then select the leg length and inner width to fit around your pipe or structural member. The size format is M[thread] × [leg length]mm × [inner width]mm. For example, an M8×50mm×90mm U-bolt has 50mm (≈2.0") legs and a 90mm (≈3.5") inner span. Measure the outer diameter of the pipe or beam you are clamping and add 2–5mm clearance to the inner width for a secure, non-binding fit.

What load can these square U-bolts handle?

304 stainless steel U-bolts in M6–M10 are generally rated for moderate-to-heavy clamping loads in static applications. Exact tensile and shear ratings depend on the specific size and installation torque. For safety-critical or dynamic load applications (e.g., suspension, lifting, or high-vibration environments), consult a structural engineer and verify torque specifications before use.

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

Yes, for most outdoor applications. 304 (A2) stainless steel offers good corrosion resistance in typical outdoor and humid conditions, including light coastal exposure. For highly aggressive marine environments or chemical exposure, 316 stainless steel is typically recommended. The black surface finish provides an additional aesthetic layer, but the corrosion protection comes primarily from the 304 alloy itself.

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

These U-bolts use standard metric coarse threads: M6×1.0, M8×1.25, and M10×1.5. They are compatible with standard DIN 934 hex nuts and DIN 125 flat washers available at any hardware store. They are not compatible with UNC or UNF inch-thread hardware.

What is the difference between leg length and inner width in the size label?

In the format M[thread] × [leg length]mm × [inner width]mm, the leg length is the usable threaded portion that passes through your mounting plate, and the inner width is the gap between the two legs — the space that wraps around your pipe or beam. For example, M8×60mm×100mm has 60mm (≈2.4") legs and a 100mm (≈3.9") inner span.

Can I use these square U-bolts to clamp round pipe or conduit?

Yes. Square U-bolts are commonly used to secure round pipe, EMT conduit, and tubing to flat surfaces or structural members. The square bend provides a stable, non-rotating grip against flat mounting plates. Select an inner width that matches or slightly exceeds the outer diameter of your pipe for a secure fit without over-stressing the bolt.

Do these U-bolts come with nuts and washers?

The listing covers the U-bolt itself. Nuts, washers, and mounting plates are generally sold separately. Please check the specific variant description or contact us to confirm exactly what is included with your order before purchasing.

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

Black Square U-Bolts 304 Stainless Steel Fixing Clamp — M6 M8 M10

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Black Square U-Bolts in 304 Stainless Steel — Secure Any Pipe, Conduit, or Beam Without Rust

✅ Key Features of These Black Stainless Steel Square U-Bolts

📐 Technical Specifications — Square U-Bolt Fixing Clamp

❓ Frequently Asked Questions

Black Square U-Bolts 304 Stainless Steel Fixing Clamp — M6 M8 M10

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