Belleville and Conical Disc Spring Home Page

Welcome to the Reliable Pressings Disc Spring and Belleville washer home page. At last count we have manufactured more than 500 different sizes of disc spring. These range from small IDs of a few millimetres, weighing less than a gram, to those that are 19mm thick, over 400mm in diameter, weighing kilograms each and designed to take loads of many tonnes. It can get quite daunting and technical. So this page is intended to provide all the necessary links to the various different pages that are relevant to the possible questions you might have, whether you are a buyer, student or design engineer.
We have provided a list of the different information pages on our website as well as a FAQ = Frequently asked question list, with (hopefully) useful answers. If you need to talk, then feel free to call us, we are here to help.

High Load Washers DIN6796 vs Conical Disc Spring DIN2093

There are two broad categories of belleville washer or bevel washer as they are sometimes called, firstly we have the DIN6796 - Heavy Load Washers. They are used to secure bolted connections with high load demands. The disc spring design ensures a permanent force/pressure to the union between the bolt and its nut and thus prevents the loss of pre-load. Unsurprisingly, these come in sizes that correspond to bolt sizes. We cater for the smaller(M2) to the largest bolt size(M125). We carry 30 different sizes in stock, the sizes of which are provided in the preceding link.

Then we have the DIN2093, or more recently DIN-EN-16983, Conical Disc Springs. These are specifically designed to provide the properties of a spring, and a Load Characteristic Curve illustrates the expected relationship between force applied and the resulting travel or compression of the spring. The graph to the left, is the Load Characteristic Curve for Class 2 - 18.4 x 50 x 2 Disc Spring with a Height of 3.65mm, whilst the graph to the right is that of a Class 3 - 64x125x7 reduced thickness disc spring (ie with contact flats) where T'=6.55mm and the L0=10mm.

Load Characteristic Curve Class 2 example Load Characteristic Curve Class 3 exmplae

Characteristic Load Curve Verification

As part of our services and quality assurance, we will calculate the expected Load Characteristic Curve of any individual disc spring or disc spring stack for you. In certain instances we have our disc springs (usually in stacks), independently tested by either SGS Metlab or the CSIR's mechanical tesing labs.

  • Mill/Material Cert and confirmation of Element Composition of Alloy material used.
  • Hardness Test to confirm the Disc Springs have been correctly Quenched & Tempered and the correct Hardness achieved
  • Load Characteristic Curves indicating expected Load and Compression dynamics relating force to travel

Where to next - more information?

Our FAQ page should be helpful for anything else.

If you need DIN 6796 Load Washers, everything you need including bolt sizes & dimensions is available on its dedicated page..

For Disc Spring Washers, there is more detail and everything you require can be found on the DIN2093 /DIN-EN-16983, home page.

For more information on how we go about our design and load characteristic performance verification, please view our approach to design calculations.

For information on ordering disc springs and the information we require to make sure you get exactly what your engineering application requires, please go to this page.

Follow these links for lists of all sizes available in DIN 2093 Group 1 and 2 sizes and all the Group 3 disc springs we offer as standard.

Although we are principally known for specialising in the larger Group 3 reduced thickness disc springs with contact surfaces (thicknesses of 6mm and greater), we do cater for the smaller sizes, such as these listed below.` Click Here to download information on all the Group 3 disc springs we offer as standard.

If you need to read up on SpringSteel and the various alloys available, as well as the key points of heat treatment, then Visit our sistec company website -Cheng Xin Spring Steel.

Very quick write-ups on key terms are provided at our sister company website. They introduce the basics around Yield Strength, explain Stress vs Strain curves and Plasticity and Deformation, introduce Hardening vs Hardenability, etc. There is also information on naming conventions for steel. If you are curious and want to know a bit about these terms then read these introductory topics.