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B 53040 

Vargal® self-locking nuts
Material: Steel 8 | Surface: zinc-plated

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Böllhoff standard 53040 | steel | 8 | zinc-plated | Cr (VI) - free | metric thread

Vargal® self-locking nuts offer reliable protection against the automatic loosening of screw connections even with strong vibrations. A metallic clamping part in the form of a coil spring is integrated. This compresses the fourfold slit, elastic collar together. The clamping force acts uniformly on the threads of the screw and does not damage the thread. The clamping force is maintained even in case of repeated reuse. The Vargal® lock nuts are processed in the same way as conventional nuts and comply with the German Federal Railway Standard BN 205 107 B

• Integrity of the threads despite high clamping force
• Reusable several times while retaining clamping force
• Fulfilment of the German Federal Railway Standard BN 205 107 B

technical details

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Application Joining by bolt, joining by screw
Cr(VI) Note Cr(VI)-free
Flange/washer without flange
Force application Hexagon head
Installation method Screw into place with tool
Material Steel
Material version 8
Risk hydrogen embrittlement
RoHS conformal
Surface zinc-plated
Thread type Metric thread


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Title Language Version File Download
Böllhoff bulletin: Changeover to Cr6+-free protective zinc layers for fasteners English 1622/15.02 894.98 KB / PDF
Data sheet: Technical information and dimensions of the product English 02/2022 126.43 KB / PDF
Fastening and assembly technology: Products and services English 1180/21-V1-EN (WBH) 8.79 MB / PDF

General questions:
Phone: +49 521 4482 7993

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