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4 Pcs Roof Box U-Bolt Clamps, Upgraded Rooftop Cargo Carrier Rack Bolts, Car Van Mounting Fitting Kit 85mm Inner Width Metal U-Bracket Clips w/ 8 Lock Nuts 2 Straps

  • Based on 170 reviews
Condition: New
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Availability: 20 left in stock
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Arrives Wednesday, Jul 22
Order within 6 hours and 37 minutes
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Features

  • [Secure Your Roof Box with Confidence] - Our 4 PCS Roof Box U-Bolt Clamps are designed to firmly hold your roof box in place, ensuring it stays safe and stable while you're on the road. The rubber gaskets and plastic back plates provide increased friction and stability, allowing you to navigate through potholes, hills, slopes, and highways with ease.
  • [Complete Installation Accessory Kit] - We provide a comprehensive roof box fixing accessory kit that includes 4 metal U-bolt clamps, 4 plastic back plates, 4 rubber gaskets, 8 heavy lock nuts, 2 bandages, and 1 set of hole sealing stickers. With these accessories, you'll have everything you need for a secure and long-lasting installation.
  • [Quality Built to Last] - Crafted from high-quality metal and plastic materials, our roof box U-bolt clamps are resistant to breakage, deformation, and corrosion caused by acid, alkali, wind, and rain. Rest assured that these clamps are good quality, ensuring long-term use. The soft rubber gaskets also protect your vehicle from unsightly scratches.
  • [Universally Compatibility] - With an inner width of 85mm/3.34in and a spacing of 98mm/3.8in between thread centers, our roof box clamps fit most car models available in the market. The lightweight and compact design of all accessories allows for easy storage in your trunk, making them readily available whenever you need them.
  • [Easy Installation] - Installing our roof box U-bolt clamps is a breeze, taking only 3-5 minutes of your time. We provide bandages that are long enough to securely fasten your roof box to your car roof. Should you have any questions or concerns, our dedicated technical and after-sales teams are here to support you every step of the way.

Description

4 PCS Universal Roof Box U Bolt Clamps Rooftop Cargo Carrier Rack Bolts 83mm Internal WidthHigh QualityThis roof box fitting is made of stainless steel, which is wear-resistant, anti-oxidation, not easy to break and deform, and has a long service life.SpecificationColor: BlackMaterial: Iron, Rubber, PlasticBolt diameter: ΦM8 / 5/16inInternal width: about 83mm/3.27inCenter to center screw width: about 98mm/3.8inInclude: 4x Iron U bolts, 4x Rubber washers, 4x Plastic backing boards, 8x lock nuts and 2 bandages, 1x Black StickerPlease confirm the size and appearance of roof box and install place before purchasing.Please check relevant install video by search"install roof box U bolts" when you in doubt.How to install this roof cargo box brackets?Put the roof box in the center of the roof and open the lid.Thread the U shaped hook from bottom to top.Put a rubber washers on the hook, and put plastic support boards.Tighten the heavy lock nuts on both sides.Pass the strap into the gap of the bracket, connect and tighten the strap.Why choose our's roof top u bolt clamps?It adopting quality iron, more reliable and stable, aviod roof box to fall during driving.Rubber gasket and plastic back board can protect car from scratches, increase friction, improve good restraint effect.

Material: Stainless Steel


Brand: Lancisism


Color: Black


Style: U-bolt clamp


Item Weight: 0.87 Kilograms


Number of Items: 4


Set Name: 1


Unit Count: 4.0 Count


Manufacturer: Lancisism


Brand Name: Lancisism


Set Name: 1


Manufacturer: Lancisism


Manufacturer Part Number: CZZJ0941


Item Type Name: Universal Roof Box U-Bolt Clamps


Unit Count: 4.0 Count


Item Weight: 0.87 Kilograms


Material Type: Stainless Steel


Color: Black


Style Name: U-bolt clamp


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 22

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews


  • Great Roof Rack Clamps
Color: Black Size: 85mm Internal Width
Bought these to attach bike trays to my roof rack, and drive 1,300 miles. Checked them once on the trip, no problem. One of the racks was used to carry a tandem.
Reviewed in the United States on February 6, 2026 by Happy customer and wife

  • Works with Yakima Rocketbox Pro
Color: Black Size: 85mm Internal Width
Works well for the Yakima Rocketbox Pro cargo carrier.
Reviewed in the United States on June 7, 2026 by Amazon Customer

  • Easy to use and perfect for securing cargo carrier
Color: Black Size: 85mm Internal Width
Bought a rooftop carrier and the clamps and hardware was missing. These worked perfectly. Easy to attach and remove without tools just hand turning.
Reviewed in the United States on February 18, 2026 by Jen Bates

  • Doesn't fit Sears X-Cargo X-Treme roof box
Color: Black Size: 85mm Internal Width
did not fit Sears X-Cargo X-Treme roof box holes. About 1/8" off.
Reviewed in the United States on June 12, 2026 by Christian Nunes

  • Far better than original set
Color: Black Size: 85mm Internal Width
This hardware was a great match with the hard, rooftop car carrier we purchased from Academy Sports. It was much sturdier than the original hardware. A little bit off with the original width of the brackets, but my husband was able to make new holes so it lined up — easy day. 👍 Would definitely recommend the hardware set. ... show more
Reviewed in the United States on August 21, 2025 by Emily Moore

  • They’re okay
Color: Black Size: 85mm Internal Width
These are okay but not holding up well. The plastic knob has already had the plastic split after one use. Not as durable as I would like, but they were cheap and got here when I needed them. If the plastic were a higher quality it would probably be a great product.
Reviewed in the United States on July 5, 2026 by Thomas A Harvey

  • Price point and convenience ! Price point and convenience !
Color: Black Size: 85mm Internal Width
Hold my two 100 watt solar panels on roof well ! Easy to mount. Fit perfectly.
Reviewed in the United States on June 11, 2025 Reviewed in the United States on June 11, 2025 by Michael G. Connell

  • Good value & good quality - may need some customization
Color: Black Size: 85mm Internal Width
Used this package to mount a Thule box (Mountaineer 669 from year 2001) on a 2022 Subaru Outback. Enlarged the mounting holes in Thule box to make a snug fit on the Subaru’s rooftop crossbars. The Thule box stayed firmly on top of the Subaru after 800+ miles road trip without any issue.
Reviewed in the United States on July 29, 2025 by W. D.

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