J-System DIN125A zinc-plated M30, 31 x 56 x 4.0 washer 140HV

The washer ensures that the clamping force is distributed over a larger surface. As a result, the bolt head or nut is less likely to sink into the material and the contact surface stays flatter and better protected.

For which connections do you use a M30 DIN 125A washer?

A washer of this size fits heavy bolts and threaded rods with M30 thread, as found in steel structures, machine building and ground anchors. Whether M30 is the right size for your application depends on the design and load of the connection. Check this with the structural engineer or in the drawing before ordering.

What do 31x56x4,0 and 140HV mean?

The first dimension, 31 mm, is the inner diameter and leaves a little clearance around an M30 bolt or threaded rod. The 56 mm is the outer diameter and determines the area over which the pressure is distributed. The 4.0 mm is the thickness of the washer. The designation 140HV indicates the hardness class of the washer, the common class for DIN 125A. Galvanized means the washer has a zinc layer for protection against corrosion.

What should you look out for when choosing the right washer?

Always choose the washer based on the size of the bolt or nut: for M30 that is 31 mm inner diameter. Also pay attention to the material and coating. Galvanized steel is suitable for many applications indoors and in sheltered environments, but for highly corrosive conditions a different version may be needed. Preferably use bolts, nuts and washers with a similar coating, so that the connection as a whole is evenly protected.

Frequently asked questions

Which bolt fits this washer?

This washer is intended for bolts and threaded rods with M30 thread. The inner diameter of 31 mm gives just enough room to slide the washer over them.

Is a washer always needed under a nut or bolt head?

Not always, but a flat washer helps distribute the pressure and protects the surface of the material. With softer materials or larger holes this is extra useful.

What is the difference between DIN 125A and other washers?

DIN 125A is a standard for flat washers with specific dimensions and a standard hardness. Other versions, such as large washers, have a larger outer diameter or a different thickness.