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Stainless Steel Washers DIN 125 and DIN 7980 for Bolted Joints
Our Washers category contains 16 stainless steel washers for bolted connections: flat washers to DIN 125 in A2 and A4, and one DIN 7980 spring washer. They spread the load under the bolt head or nut and protect the joined surface. They are intended for installers, including those working on photovoltaic structures.
What you will find in this category
- A2 flat washers DIN 125, M6 to M30, stainless steel 1.4301 (grade 304), non-magnetic.
- A2 flat washers for PV installations, M8 to M16, outer diameter 16-30 mm, thickness 1.6-3 mm.
- A4 flat washers DIN 125, M6 to M16, stainless steel AISI 316 with molybdenum, hardness 140 HV.
- A2 spring washer DIN 7980, M8, internal diameter 8.1 mm, external diameter 12.7 mm, height 4 mm.
How to choose
- Steel grade: A2 (1.4301, grade 304) suits general outdoor use. A4 (AISI 316, with molybdenum) is intended for aggressive environmental conditions.
- Thread size: match the washer to the bolt, from M6 to M30. Only M8 is available as a spring washer.
- Washer type: choose a flat washer to distribute pressure. Choose the DIN 7980 spring washer where the joint must keep tension.
- Dimensions: check hole diameter, outer diameter and thickness. For example, the M12 A2 PV washer has a 13 mm hole, 24 mm outer diameter and 2.5 mm thickness.
Typical applications
The A2 washers in sizes M8 to M16 are described for bolted connections in photovoltaic structures. These include roof-mounted and ground-mounted installations and other outdoor structures. The M12 washer is also described for marine environments. A4 washers are chosen where conditions are aggressive. The spring washer helps in joints exposed to temperature changes or vibration.
Frequently asked questions
What is the difference between A2 and A4 washers?
A2 is 1.4301 (grade 304) austenitic stainless steel, non-magnetic, with added nickel for corrosion resistance. A4 is AISI 316 stainless steel with molybdenum, intended for aggressive environmental conditions.
What does a spring washer do?
The DIN 7980 spring washer keeps constant tension in the joint. Its spring action compensates for thermal changes and prevents loosening caused by temperature fluctuations or vibration.
Which washers are listed for PV installations?
The A2 DIN 125 flat washers in M8, M10, M12, M14 and M16 are described for photovoltaic bolted connections. The M8 DIN 7980 spring washer is also listed for photovoltaic use.
Not sure which grade or size fits your joint? Contact our technical support for help with selection.