Choosing the right hex bolt with a through-hole can simplify electrical passes, wiring installations, or lamp assembly. This guide reviews five solid options that balance corrosion resistance, strength, and ease of threading. Each product features a hollow bolt design designed to pass wires or cables, with accompanying nuts or washers as noted. Use the featured specs to compare sizes, materials, and finishes to fit your project needs.
style=”display:none”>Summary Table of Selected Products:
– DLBEEM 15pcs Hollow External Hexagon Screw (M6/M8/M10) – 304 Stainless Steel
– Rrina 4Pcs 304 Stainless Hollow External Hex Bolt (M12x35)
– PATIKIL M10x10mm Hollow Bolts Kit – Carbon Steel, White Zinc
– 1 Sets M12x40mm Hollow External Hexagon Screw – 304 Stainless Steel
– Hard-to-Find Fastener Full Thread Hex Tap Bolts – Zinc-coated steel
DLBEEM 15pcs Hollow External Hexagon Screw Set
These cylindrical hollow hexagonal screws and nuts are made from 304 stainless steel, offering good rust and corrosion resistance, durability, and deformation resistance. Available sizes include M6, M8, and M10 with 16 mm screw length and bore diameters of 3.2 mm, 4.2 mm, and 5.2 mm. The through-hole design includes burr-free chamfered holes for easy threading and installation, making them suitable for lamp assemblies and other through-hole needs.
Rrina 304 Stainless Hollow External Hex Bolt (M12x35)
Made of 304 stainless steel, this set includes four hollow external hex screws with washers and nuts. The M12x35 size has an inner hole around 6.2 mm, enabling passage of wires or small cables. The design emphasizes corrosion resistance and durability, making it appropriate for outdoor or humid environments where through-hole bolts are needed.
PATIKIL M10x10mm Hollow Bolts Kit
Specification highlights: carbon steel with white zinc plating for balance of strength and corrosion resistance. Hollow screw bolts are M10 with 7 mm inner length, including nuts for secure assembly. The kit’s through-hole design facilitates wiring through the bolt, ideal for chandelier fixtures or lamp assemblies where a clean, threaded through-hole connection is required.
Generic M12x40mm Hollow External Hex Bolt
Constructed from 304 stainless steel for rust resistance and durability, this through-hole bolt measures M12 by 40 mm with a 6.2 mm inner hole. The chamfered, burr-free ends ensure smooth threading and installation. Through-hole capability allows wiring to pass through the bolt, simplifying lamp or mechanical assemblies where a long, hollow bolt is advantageous.
Powerful Stability: 3/8″ Hex Tap Bolts for Through-Hole Applications
Though not all variants are hollow, this set provides a robust option for securing through-hole connections where standard threading meets resistance or damage. The included S-2 steel bits and chrome vanadium bodies deliver a durable profile for heavy-duty or industrial applications. The patented spiral design reduces stripping risk during removal, making it a practical companion in a toolkit with through-hole bolt capabilities.
Buying Guide: Key Considerations For Through-Hole Hex Bolts
- Material and corrosion resistance: Stainless steel (like 304) offers durable corrosion resistance for indoor and outdoor use. Carbon steel with zinc plating is a cost-effective option for indoor or mildly humid environments.
- Hole size and bore compatibility: Ensure the inner hole diameter accommodates your wiring or cable needs without excessive looseness that could affect strength.
- Thread length and head design: Longer threaded cycles and tight tolerances improve engagement in tapped holes. Hollow bolts should have clean chamfers and burr-free surfaces for easy threading.
- Finish and environmental suitability: For outdoor installations, rust resistance and UV exposure tolerance matter. Black oxide, zinc plating, or stainless steel finishes offer different levels of protection and aesthetics.
- Included hardware: Nuts, washers, and lock washers can affect load distribution and vibration resistance. Verify what is included and whether it’s needed for your project.
- Size variety: A kit with multiple M-diameters (M6, M8, M10, M12) provides flexibility for different projects, reducing the need to purchase multiple separate parts.
- Through-hole accessibility: Consider whether the through-hole path will pass wires, pipes, or mounting hardware without obstruction. Chamfered holes ease installation and reduce cross-threading risk.
Comparative Snapshot
- Best for corrosion resistance: DLBEEM and Rrina (304 stainless steel options).
- Best value for a starter kit: PATIKIL M10x10mm Hollow Bolts Kit.
- Best for larger through-holes: 1 Sets M12x40mm Hollow External Hexagon Screw.
- Versatile toolkit option: Power tool-ready tap bolt kit (for broader fastening tasks).
All listed products are designed to support through-hole applications where a hollow bolt is desired for wiring, lamps, or equipment that requires a through-hole path. When selecting, align your material choice, bore diameter, and length with the specific electrical and mechanical needs of your project.