Screw chain link 4mm – AISI 304

Our 4mm screw chain link is a popular accessory. Almost no climbing equipment is without it. Firstly, you can use it to attach all kinds of equipment. For example, the step sling on the ascender. Secondly, the product has a breaking load of 280 kg or 650 kg and is therefore very reliable when it comes to holding smaller loads.

Caution! This product must NEVER be used as a belay point for a person. It is an accessory part only.

Properties Screw chain link 4mm

• Manufacturer: Kong
• Material: AISI 304 stainless steel
• Diameter: 4mm
• Inner radius: 6mm
• Breaking loads: 280kg in longitudinal direction
• Weight: 13 gram
• For accessories only – NEVER use as a securing point for one person!

Areas of application

The screw chain link with a thickness of 4 mm is very popular in many areas, for example:

• Fixed attachment of a stepladder to the ascender
• Attach the haulbag to a swivel
• Attach the material bag to the belt

Watch out for galvanic corrosion!

If you install a 4 mm fixed screw chain link, you must pay attention to galvanic corrosion! This means that you must not hang this stainless steel product in a zinc plated steel fixed point. This will lead to corrosion of the fixed point over time.

Please always combine zinc-plated components with other zinc-plated components such as bolt hanger combine. If the fixed point is made of zinc plated steel, you must use a link with the same steel quality. This is the only way to ensure long-term durability. I.e. over many years.

If you are interested in this topic, read our technical article: Steel qualities at expansion bolt and glue in bolt

Problematic DIY store screw links

Unfortunately, non-standardized products from the DIY market keep turning up at abseiling points. Like the screw chain link here. Caution! These can be life-threatening. The breaking loads are often only a few hundred kilos. Consequently, these links do not meet any standards.

Only use standardized products. They are clearly recognizable by the markings on the side. Only standardized material should be used in the above-mentioned areas. This means that this screw chain link is also not standardized and can therefore only be used as an accessory.

screw link Note types!

There are many different models of quick links. The oval shape of this 4 mm screw chain link is the classic one. It is mainly used for vertical power transmission of narrow ropes or steel components. This is because the inner radius is only 6mm. For example, from a step sling to a ascender. Or from a haulbag to a swivel.

Depending on the intended use, these shapes may also be more suitable:

• D-shaped: for attaching several securing points as with the work at heights
• Triangular: to transfer loads from a small attachment point to a slackline, for example
• rectangular: for lifting work such as connecting sling to sling
• pear-shaped: on the one hand where large screw openings are required or wide components are to be suspended on the other hand
• oval: classic design for all vertical force transmissions

Practical tip for the 4mm screw chain link

Anyone who uses this quick link regularly should maintain it. Yes, exactly! W A R T E N! This can be the case with work at heights, for example. Here you have to hang the link in and out of the harness or rigging plate again and again. This means you are well advised to lubricate it with a climbing equipment care oil. This means that the screw lock can still be operated easily!

Link tip: to the manufacturer