Spring Washer Koelner M12 A2 DIN 127, stainless steel, set of 11

Koelner spring washer M12 A2 DIN 127 is a split (spring) washer designed to provide axial preload for M12 bolts and nuts. Manufactured from A2 stainless steel, this set of 11 washers offers corrosion resistance suitable for environments where rust prevention and reliable fastening are required. The washer's DIN 127 geometry ensures compatibility with standard M12 fasteners and helps reduce the risk of loosening due to vibration and dynamic loads.

Advantages

These A2 stainless steel spring washers combine mechanical locking action with corrosion resistance, making them appropriate for indoor and outdoor applications. The DIN 127 split design delivers consistent spring force to maintain tension in bolted joints, while the stainless material resists oxidation and staining. Supplied as a set of 11, they allow for small repair jobs or multiple fastening points without immediate need to purchase larger quantities.

Suitable for

• Mechanical assemblies and machine maintenance
• Construction and metalwork fastening
• Automotive repairs and component assembly
• Outdoor installations and environments with moderate moisture exposure
• General maintenance tasks requiring corrosion-resistant locking washers

Key specifications

• Washer type: split (spring) washer, DIN 127 style
• Nominal size: for M12 fasteners
• Material: A2 stainless steel (corrosion-resistant grade)
• Finish: natural stainless steel surface
• Pack quantity: 11 pieces

How to use

Place the spring washer between the mating surface and the nut (or under the head of the bolt) so the washer's split makes contact to provide axial preload when the fastener is tightened. Tighten the nut or bolt to the specified torque for the joint; the spring washer will compress slightly and exert a retaining force to reduce loosening under vibration. For best results, use with matching M12 bolts and nuts and ensure mating surfaces are clean and free of debris.

Usage recommendations

Use these washers where moderate corrosion resistance and vibration locking are required. Avoid using A2 stainless spring washers in highly corrosive chemical environments or chloride-rich conditions for prolonged periods; consider higher-grade stainless materials for such exposures. Confirm torque values for the specific joint to prevent over-compression of the spring washer and ensure proper clamp load.