
Storage Shelf Column with Butterfly Holes – Roll Forming Technology
Storage shelving systems come in a variety of designs, each featuring different column structures. One key distinction lies in the hole patterns punched into the columns. These holes play an important role in connecting beams, enabling flexible adjustment and easy assembly. Among the most popular designs is the butterfly hole, which we will explore in this article along with the corresponding roll forming machine used to manufacture these columns.

Butterfly Hole Column Roll Forming Machine Storage Shelf
Raw material | Galvanized steel |
Material thickness | 1-2 mm |
Rolling shaft material | 45# steel with tempering treatment |
Shaft diameter | 70 mm |
Rolling station | 18 stations |
Work speed | 0-12m/min (include hole punching) |
Machine frame | Iron casting vertical structure |
Machine body | steel plate welded with grinding |
Motor brand | Lichao |
Work power | 7.5 kw+7.5kw (two motors driving) |
Transmission | Chain transmission |
Leveling station | 5 shafts |
Straightening | 4 vertical rollers |
Why Are There Different Hole Types in Shelf Columns?
The hole patterns on the rack columns (including butterfly holes, diamond holes and eight-slot holes) are selected according to the specific environment and application requirements. Although the overall structure of the rack may be similar, the shape of the holes will affect the installation method, load distribution and price. Generally, the holes are spaced 50 mm apart, so the rack height can be adjusted in 50 mm increments.

Butterfly Hole Column Roll Forming Machine Storage Shelf
The butterfly-shaped hole, named for its resemblance to butterfly wings, offers several benefits:
- Quick and tool-free installation – Butterfly holes allow for fast assembly using clip-on brackets.
- Enhanced stability – The design ensures tight fitting between the beam and column, reducing shelf wobble.
- Ideal for medium-duty storage – These columns are commonly used in mid-range shelf systems, including retail and industrial storage.
- Compatible with multiple shelf styles – From mobile and pallet shelves to mezzanine and gravity racks, the butterfly design supports modern shelving versatility.
In some cases, round holes are also added to enhance compatibility and increase the flexibility of connections. However, adding round holes may slightly reduce load capacity, depending on the material and hole layout.
Machine Configuration and Customization
When manufacturing shelf uprights with butterfly holes, each column size typically requires a dedicated roll forming machine, while different punching patterns only require die changes, making production more efficient.
For the butterfly-hole style, our roll forming machine features:
- A robust structure designed for long-term stability and precision.
- Interchangeable punching dies for multiple hole types.
- Adjustable roll sets to accommodate various widths and thicknesses.

Butterfly Hole Column Roll Forming Machine Storage Shelf
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