Glazeal U-Bolt Roof Box Clamps 4-Pack — 82mm Inside Width, Stainless Steel Kit with Straps

Glazeal 4Pack U-bolt clamps secure roof boxes and cargo carriers to most car and van racks with an 82mm inside width and included straps and lock nuts.

These mounting fittings replace worn or missing hardware and give a compact, corrosion-resistant fastening system for rooftop cargo boxes. Built from stainless steel, plastic backing plates and rubber pads, the kit balances durability with vehicle protection. It includes four U-bolts, four rubber washers, four backing plates, eight lock nuts, two straps, and one sealing sticker so you get a complete clamp solution in a single purchase. Before buying, verify that the clamp dimensions match your roof box and rack; this kit is not compatible with Thule car racks.

How do these U-bolt clamps attach a roof box to a rack?

Installation is straightforward: the U-bolt passes under or around the rack crossbar, the rubber washer and plastic backing plate sit against the roof box base, and lock nuts tighten the assembly. The rubber pad increases friction and cushions the contact point to reduce movement. The included straps add a secondary restraint for extra security during travel.

• Inside width: 82mm (3.23 in); thread center-to-center: 90mm (3.54 in)
• Screw diameter: M8 (7.5mm / 0.30 in)
• Works with racks up to ~40mm (1.57 in) thick and 80mm (1.96 in) wide
• Kit includes 4 U-bolts, 4 rubber washers, 4 backing plates, 8 lock nuts, 2 straps, 1 sealing sticker

Will these clamps resist rust and road wear?

The U-bolts and lock nuts are stainless steel to minimize corrosion from rain, road salt, and humidity. Plastic backing plates and rubber gaskets are selected for wear resistance and temperature tolerance so the components remain stable over seasons. While durable, inspect periodically for wear and retighten after long trips.

• Stainless steel fasteners reduce rusting
• Rubber gaskets absorb vibration and protect surfaces
• Plastic backing plates resist cracking and deformation
• Lightweight parts are easy to store when not in use

Are these clamps compatible with my roof box and vehicle?

This clamp set fits most aftermarket and universal roof boxes, cargo carriers, and many factory racks as long as your crossbar dimensions fall within the listed limits. They are not designed for Thule branded racks—compare measurements before purchase. The kit’s strap length and hardware suit routine opening and closing of the box without constant reconfiguration.

• Not compatible with Thule car racks—measure before ordering
• Best for crossbars up to ~40mm thick and 80mm wide
• Ideal for many car and van cargo carrier setups
• Includes extra lock nuts for secure fastening

How do these parts improve safety on the road?

The combination of stainless U-bolts, friction-increasing rubber pads, and plastic backing plates limits movement of the roof box during acceleration, cornering and over bumps. That stability reduces the chance of rattling, sudden detachment, or damage to the carrier and vehicle finish. Use the included straps as an additional fail-safe for heavy loads or rough roads.

• Reduces vibration transmitted to the cargo box
• Protects vehicle paint and roof box base from abrasion
• Prevents loosening with multiple lock nuts
• Straps provide secondary restraint for added security

Who is this for: The Glazeal 4Pack U-bolt clamp kit is suited to drivers who already own a compatible rooftop cargo box and need a reliable replacement or spare mounting set. It appeals to families, weekend adventurers, and tradespeople who want corrosion-resistant hardware that protects vehicle surfaces and keeps rooftop loads stable. Check your crossbar and box measurements first to confirm fit before ordering.