A hollow bolt with a hole through its threaded body lets wire pass through a fastener, making it useful for certain lamp, chandelier, and hardware assemblies. The best choice depends on thread size, bolt length, center-hole diameter, material, and included hardware. The M8 stainless-steel set suits buyers seeking washers and nuts; the M10 assortment offers several lengths; and the M6 stainless-steel option is a compact, longer screw. Check the measurements against your assembly before ordering.
| Product | Best For | Key Detail |
|---|---|---|
| 304 Stainless M8 Set | Buyers who want washers included | M8x25; 4.1 mm hole |
| PATIKIL M12 Round Head | M12 applications | 20 bolts and 20 nuts |
| PATIKIL M10x35 Set | Longer M10 fasteners | 10 sets; 7 mm inner diameter |
| PATIKIL M6x40 Stainless | Smaller-thread assemblies | 3.2 mm center hole |
| PATIKIL M10 Assortment | Several M10 lengths | Five bolt lengths and gaskets |
304 Stainless Steel M8 Hollow Bolt Set
This M8x25 hollow external-hex screw is made from 304 stainless steel. Its center hole measures 4.1 mm, and the package includes four screws, four nuts, four flat washers, and four spring washers.
Best for: Buyers who need M8 hardware and prefer a set with both flat and spring washers. Stainless steel is specified as corrosion-resistant, making this a practical option where moisture resistance is a consideration. It was selected for its included assembly hardware and clearly stated bore size.
Check before buying: The 4.1 mm center hole may not fit thicker wire. Confirm the M8 thread and 25 mm length suit the specific assembly.
PATIKIL M12 Round-Head Hollow Bolts
This kit includes 10 carbon-steel through-hole bolts and 10 hex nuts. The bolts have an M12 x 1 mm thread and measure 20 mm high, with an 8.5 mm inner diameter. The galvanized surface treatment is described as helping resist corrosion.
Best for: Buyers whose project calls for an M12 x 1 mm thread and a comparatively wide 8.5 mm passage. The larger listed center opening and included nuts make it a relevant choice for routing wire through a compatible assembly.
Check before buying: This is a specific fine-thread size, not a general fit for all M12 parts. Confirm the thread pitch and dimensions; the listing specifies carbon steel rather than stainless steel.
PATIKIL M10x35 Fine-Thread Hollow Bolt Set
Each of the 10 sets contains one carbon-steel hollow bolt and one nut. The bolt has an M10 thread with a 1 mm pitch, a 35 mm length, and a 7 mm inner diameter. White zinc plating is specified, and the listed thread length is 32 mm.
Best for: Buyers needing a longer M10 hollow bolt with a 7 mm passage. The 10-piece set is suitable when several matching fasteners are needed, and the product description identifies lamp parts and socket extensions as intended uses.
Check before buying: The 1 mm thread pitch is important to match. Choose another option if your assembly requires stainless steel or a different M10 pitch.
PATIKIL M6x40 Stainless Hollow Screws
This pack contains three 304 stainless-steel hollow screws and three nuts. The screws have M6 threads with a 1 mm pitch, a 40 mm thread length, and a 3.2 mm center hole. The stated total screw length is 44 mm.
Best for: Smaller M6 assemblies that need a relatively long threaded section and a stainless-steel fastener. It was selected for buyers who need a compact thread size but still want a 40 mm threaded length.
Check before buying: The center hole is narrower than those listed for the M10 and M12 options. Check wire thickness and required overall length, including the stated 44 mm total length.
PATIKIL M10 Hollow Bolt Length Assortment
This 100-piece assortment includes 25 carbon-steel bolts, 25 hex nuts, 25 toothed gaskets, and 25 smooth gaskets. The M10 x 1 mm bolts come in five lengths: 7, 12, 17, 22, and 27 mm. The stated inner diameter is 7 mm for each bolt.
Best for: Buyers who want to compare several M10 bolt lengths or keep multiple lengths available. The included nuts and two gasket types provide more assembly components than a bolt-and-nut-only set.
Check before buying: The longest listed bolt is 27 mm, so choose the M10x35 set if you specifically need a 35 mm bolt. This assortment is carbon steel with galvanizing, not stainless steel.
Buying Guide
Which thread size and pitch do you need?
Match the bolt’s thread diameter and pitch to the receiving component. These products include M6, M8, M10, and M12 options. The M10x35 and M10 assortment both specify a 1 mm pitch; the M12 product specifies M12 x 1 mm. Do not assume that bolts with the same nominal diameter have interchangeable pitches.
How large must the through-hole be?
Compare the listed inner diameter with the wire or component that must pass through. The listed openings range from 3.2 mm on the M6 screw to 8.5 mm on the M12 bolt. Allow room for the wire’s actual thickness and any covering, and check product measurements before choosing.
Should you choose stainless steel or plated carbon steel?
The M8 and M6 options are listed as 304 stainless steel. The PATIKIL M10 and M12 options are carbon steel with a plated surface treatment. Consider the material stated for the product and the conditions of your project; do not treat plating and stainless steel as the same material.
Do you need one length or an assortment?
Choose a fixed-length set when your assembly calls for a specific measurement, such as M10x35. The five-length M10 assortment is more useful when you need options from 7 to 27 mm. Check whether the package includes nuts, washers, or gaskets that your installation requires.
Frequently Asked Questions
What is a hollow bolt with a through-hole used for?
It is a fastener with an opening through its center. The opening can let wire pass through, including in some lamp and chandelier assemblies.
How do I measure a hollow bolt?
Check the thread diameter and pitch, bolt length, and inner-hole diameter. Also confirm whether the stated length refers to the threaded portion or the total screw length.
Can any wire pass through these bolts?
No. The available passage depends on the bolt’s inner diameter. Compare the wire’s thickness with the stated opening before selecting a fastener.
Are these products all stainless steel?
No. The M6 and M8 sets are listed as 304 stainless steel. The M10 and M12 options are listed as carbon steel with a plated surface treatment.