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Blow-type screw feeders play an important role in industrial automation. The maximum screw size they can handle is a key performance indicator. However, since there are many different models and specifications on the market, the maximum screw size varies. So, what is the largest screw a blow-type feeder can handle? Let’s take Danikor’s blow-type screw feeder as an example.

To answer this, we must first understand how it works. A blow-type screw feeder uses compressed air to generate airflow that blows screws through a feed tube to a designated position. It’s simple, efficient, and widely used in automated assembly lines in electronics, automotive, and home appliance industries.

In many cases, the screw’s model and size determine whether it can be blown successfully. A key factor is the length-to-diameter ratio (LDR).

The LDR is the ratio of the screw’s shank length to the head (or washer) diameter. Due to manufacturing tolerances, the minimum shank length and maximum head diameter are used. For screws with washers, the maximum diameter of the head and washer is considered.

During blowing, an LDR that is too large or too small can affect both feeding and tightening. So what LDR is ideal?

• Small LDR screws are top-heavy, making them harder to align and more prone to tipping or jamming in the tube, especially when the angle between the screw and tube is less than 30°.

• LDR > 1.3 generally allows for stable and orderly feeding.

Danikor’s experience shows:

• 1.1 < LDR ≤ 1.3: Risk of jamming; feasibility must be assessed based on actual conditions.

• LDR > 1.3: Stable and efficient feeding, balancing line takt time.

Another factor is the feeder’s design specs. Different models are built for specific screw size ranges. With advancing technology, newer feeders can handle larger screws. For example, Danikor’s step-type screw feeder supports M2–M24 screws. Therefore, Danikor’s blow-type feeder can handle up to M24 screws, provided the LDR is within 1.1 < LDR ≤ 1.3.

Lastly, screw characteristics—material, shape, weight—also affect feeding. Heavier screws need stronger airflow; irregular shapes may require special alignment mechanisms.

Today, many brands offer blow-type feeders with varying performance. Leading brands like Danikor, with advanced and stable technology, dominate the market. Their feeders support a wide range of screw sizes and offer high efficiency, stability, and intelligence, meeting diverse industry needs.

In summary, there is no fixed answer to the maximum screw size a blow-type feeder can handle. It depends on multiple factors. When selecting a feeder, consider your specific production needs and screw characteristics to ensure efficiency and quality.