DIN 6796 - Belleville Heavy Load Washers

Static Bolted Connections

Called a variety of names Belleville/Bevel, Cup, Heavy Load and High Torque Washers, regardless of the name used the function is the same, and this is to ensure a permanent pressure to the union between a bolt and a nut to prevent the loss of pre-load on it; This static fix remains regardless of vibrations or heat change dynamics which may appear over time. They are used to secure bolted connections with high load demands.

The key points to note are:

• Typically used with hardened bolts ranging from grade 8.8, 10.9 and 12.9 (US-Grade 5, 8 & A325)
• They are made from spring steel alloys - we mostly use SAE1065 and SAE6150 (for thicker cross sections)
• They are through hardened to between Vickers HV 420 and 510 (Rockwell C, HRC 43-52)
• We use a high temperature oxidizing process as the surface treatment on the high carbon content versions.
• We prefer to avoid electroplating, as this requires an additional de-embrittlement step, which is unreliable in smaller cross-sections
• In flux dense environments we use various stainless steels including INCONEL-x750 to avoid induction heating and issues with a degradation of the Young's Modulus of Elasticity

Dimensions - DIN 6796.