similar to ISO 4014 | DIN standard has been withdrawn
DIN 931 | steel | 8.8 | zinc-plated, thick-film passivated (VZD) | Cr(VI)-free | metric thread | screws can be paired with a 6h tolerance-compliant female thread
Note: similar to ISO 4014 | DIN-standards has been withdrawn | changed spanner widths for M10, M12, M14 and M22
Surface (VZD): galvanized, thick-film passivated, min. 5µm | corrosion resistance to DIN EN ISO 9227*: white rust 72h, red rust 144h | defined coefficient of friction µ(total) = 0.12 - 0.18 for elements with a nominal tensile strength ≥ 800 MPa
*The verification of the mentioned minimum requirements is carried out according to the test conditions of DIN EN ISO 4042, galvanic coatings for fasteners. For dimensions < M5, the above values may deviate downwards.
This standard specifies the characteristics of hexagon head bolts of product grade A and B:
Product grade A = For threads M1,6 to M24 and nominal lengths = 10d or 150 mm, whichever is the shorter
Product grade B = For threads over M24 or nominal lengths > 10d or 150 mm, whichever is the shorter.
Information about the product class can be found in the technical details of the selected article.
Note: similar to ISO 4014 | DIN-standards has been withdrawn | changed spanner widths for M10, M12, M14 and M22
Surface (VZD): galvanized, thick-film passivated, min. 5µm | corrosion resistance to DIN EN ISO 9227*: white rust 72h, red rust 144h | defined coefficient of friction µ(total) = 0.12 - 0.18 for elements with a nominal tensile strength ≥ 800 MPa
*The verification of the mentioned minimum requirements is carried out according to the test conditions of DIN EN ISO 4042, galvanic coatings for fasteners. For dimensions < M5, the above values may deviate downwards.
This standard specifies the characteristics of hexagon head bolts of product grade A and B:
Product grade A = For threads M1,6 to M24 and nominal lengths = 10d or 150 mm, whichever is the shorter
Product grade B = For threads over M24 or nominal lengths > 10d or 150 mm, whichever is the shorter.
Information about the product class can be found in the technical details of the selected article.
Material version:
8.8
Cr(VI) Note:
Cr(VI)-free
Flange/washer:
without flange
Risk hydrogen embrittlement:
Thread type:
Metric thread
Head shape:
Hexagon head
Force application:
Hexagon head
Material:
Steel 8.8
Installation method:
Screw into place with tool
Surface:
zinc-plated, thick-film passivated (VZD)
Product type:
Cap screw with external driving feature
Product group:
Screws
RoHS conformal:
Material:
Steel
Böllhoff bulletin: Changeover to Cr6+-free protective zinc layers for fasteners
VZD – the Cr(VI)-free alternative: Sustainable surface protection from Böllhoff
Fastening and assembly technology: Products and services
The Manual of fastening Technology: 8th edition
