DIN 988 | steel | zinc-plated, thick-film passivated (VZD) | Cr(VI) - free
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.
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.
Cr(VI) Note:
Cr(VI)-free
Form:
Round
Risk hydrogen embrittlement:
Material:
Steel
Installation method:
Assembly by hand
Surface:
zinc-plated, thick-film passivated (VZD)
Product group:
Washers
RoHS conformal:
Material:
Steel
VZD – the Cr(VI)-free alternative: Sustainable surface protection from Böllhoff
Böllhoff bulletin: Changeover to Cr6+-free protective zinc layers for fasteners
Fastening and assembly technology: Products and services
The Manual of fastening Technology: 8th edition
