Cup Square M20 x 140mm Black Gr.4.8 DIN 603

Cup Square
Metric
Black / Self Color
Mild Steel Grade 4.8
Dia: M20
Pitch: 2.5
Length: 140mm
DIN 603
Wrench Size Across Flats: 30mm - to fasten nut only.
The DIN 603 cup square bolt (also known as a carriage bolt or coach bolt) is a specialized, tamper-resistant fastener primarily used for joining timber components. It features a unique design that allows for single-sided installation and a smooth finish.