Hollow Hex Bolts, M6 x 20mm

People assembling or repairing a chandelier, pendant light, or ceiling light may find this five-piece set useful when a hollow bolt is needed for a threaded connection. Each bolt has an internal through-hole, so a wire or other suitable component can pass through the center while the bolt fastens parts together. The set includes matching M6 hex nuts, and the listed dimensions help you compare it with the hardware already in your fixture. Without having tried it, the main buying check is whether the thread, length, and hole diameter match your specific setup.

Best use cases

These hollow external hex bolts are intended for connecting and fastening parts in lighting applications such as chandeliers, pendant lights, and ceiling lights. For example, when fitting a pendant, the hollow center can provide a route through the bolt while the threaded section secures the connection, the included nut can then be used to fasten it. That makes this more purpose-specific than a solid bolt, which does not offer a through-hole for routing something through its center.

You’ll appreciate it if you need M6 hollow hardware for a light fixture and want the nuts included in the same set. It may not suit you if your fixture calls for another thread size, a different bolt length, or a larger center opening. The listed inner hole diameter is 3.2mm, so that detail matters if the opening has to accommodate a particular wire or part.

Product specs

The bolts are made of 304 stainless steel, with a cylindrical hollow body and an external hex head. The listed thread diameter is M6, thread length is 20mm, and thread pitch is 1.0mm. The inner hole measures 3.2mm in diameter, the head is 4mm high, and the hex measures 10mm across opposite edges. The included nuts are M6. The package contains five hollow bolts and five hex nuts.

The description presents the stainless steel as resistant to rust and deformation, but it does not provide a corrosion rating or other test results. Match the dimensions against the existing fixture hardware rather than relying on the general M6 label alone: thread pitch and usable length can matter when a fastener has to seat properly. The measurements are also given in millimeters, with inch equivalents included in the product details.

Where it shines

The practical advantage is the combination of a hollow center and an external hex shape. The center opening supports through-routing, while the hex head gives a place to turn the bolt during installation. Having the matching nuts in the package also means you are not sourcing that fastening piece separately. For a lighting repair that needs this particular configuration, that is more relevant than buying a general assortment of solid screws.

The trade-off is specialization. These are not a general-purpose replacement for every light fixture fastener, and the package information does not establish compatibility with a particular lamp or wiring arrangement. The hole diameter is specific, too, if your installation needs a wider passage, these dimensions will not answer that need.

When it makes sense

This set makes sense when the existing hardware or fixture instructions call for an M6 hollow external hex bolt measuring 20mm in thread length, with a 3.2mm through-hole, and the M6 nuts are also appropriate. What matters more here: simply getting a bolt, or getting the hollow format needed for the connection? If the through-hole is central to your assembly, this design addresses that requirement directly.

For a straightforward replacement, compare the old fastener’s thread, length, head, and opening with the listed measurements before choosing. If you only need a solid fastener, a conventional bolt may be the more fitting approach, if your fixture needs a different size or hole diameter, this set is unlikely to solve the mismatch.