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B 151 

ZAHN self-locking screws
Material: Steel | Surface: zinc-plated

Diameter (d)

Length (l)

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Böllhoff standard 151 | steel | Property class 90, from M12 Property class 100 | zinc-plated | Cr (VI) - free | metric thread

The ZAHN self-locking screws are mechanical anti-rotation devices that effectively prevent the automatic loosening of the connection. The reliable securing effect is achieved by the locking teeth, which penetrate into the support material by the depth of the tooth when tightening. The material into which the screw is screwed must have a lower hardness than that of the screw. If the screw connection is loosened again, damage to the surface of the support material can be expected. If surface damage is to be avoided, we recommend the use of the RIPP LOCK® self-locking screws.

• Reliable screw locking without additional elements
• Enlarged bearing surface makes washers and spring washers superfluous
• Reduced setting values of the screws

technical details

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Application Joining by bolt, joining by screw
Cr(VI) Note Cr(VI)-free
Flange/washer with flange
Force application Hexagon head
Head shape Hexagonal head with flange
Installation method Screw into place with tool
Material Steel
Risk hydrogen embrittlement
RoHS conformal
Surface zinc-plated
Thread type Metric thread


Please log in for CAD-Downloads.
Title Language Version File Download
Böllhoff bulletin: Changeover to Cr6+-free protective zinc layers for fasteners English 1622/15.02 894.98 KB / PDF
Fastening and assembly technology: Products and services English 1180/21-V1-EN (WBH) 8.79 MB / PDF
Data sheet: Technical information and dimensions of the product English 02/2023 134.86 KB / PDF

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