Belleville

A Belleville Spring, also called Disc Spring or Conical Compression Washers, is a conical shaped disc that will deflect (flatten) at a given rate. This allows the spring to produce very large loads in a very small place. These springs offer high loads with small deflections and self-damping. They are available in different materials such as 1074 high carbon steel, 301 stainless steel, 17-7PH, H-13 tool steel, Inconel 718, 510 phosphor bronze and nickel plated.

Belleville springs are used in a variety of applications where high spring loads are required. They are particularly useful where vibration, differential thermal expansion, relaxation, and bolt creep are problems. The Load-deflection curve of the spring which can be designed for various applications ranging from linear rates to negative rates. A single Belleville Spring has a specific load and deflection. Belleville Springs in stacked arrangements provide increased load and / or deflection. Two springs stacked in parallel doubles the load of the single spring with no increase in deflection. Two springs stacked in series doubles the deflection of a single spring with no increases in load. The parallel - series combination results in the load of two springs and the deflection of two springs.

INSTALLATION
Belleville Springs must be installed with the convex side facing the bolt head or nut. In some applications a flat washer is used under the OD of the Belleville Spring to help spread the load. If a flat washer is used, the OD should be no smaller than the OD of the Belleville Spring, and the flat washer should be thicker than the Belleville Spring.

AISI 6150 Alloy (ASTM A506)
Available only as Belleville Spring Washers. Operating temperature range: -40° F to 350° F (-40° C to 180° C). For indoor/outdoor service, electrical and mechanical. Fully magnetic. Finish: All washers are completely scale-free and deburred. Mechanically zinc plated .0005” thick, minimum, with a clear or yellow chromate dip. Black Oxide oil coat and a light oil protective coating.

AISI 1074 High Carbon Steel (ASTM A684, AMS 5120H)
Operating temperature range: -40° F to 350° F (-40° C to 180° C). For indoor/outdoor service, electrical and mechanical. Fully magnetic. Finish: All washers are completely scale-free and deburred. Mechanically zinc plated .0005” thick, minimum, with a clear or yellow chromate dip. Black Oxide oil coat and a light oil protective coating.

AISI 301 Stainless Steel (ASTM A666, AMS 5519)
Available only as Belleville Spring Washers. Operating temperature range: -400° F to 550° F (-240° C to 290° C). For indoor/outdoor service and use in corrosive atmospheres. Slightly magnetic. Finish: Scale-free and deburred.

AISI 17-7 PH Stainless Steel (ASTM A693, AMS 5528)
Available as both Belleville Spring and Flange Washers. Operating temperature range: -400° F to 550° F (-240° C to 290° C). For indoor/outdoor service and use in corrosive atmospheres. Not recommended for chloride or fluoride applications. Suitable for cryogenic applications. Highly magnetic. Finish: Scale-free and deburred. If desired, a Low Stress Sulfamate Nickel plated finish from .0003” to .0005” thick per AMS 2424D can be supplied.

510 Phosphor Bronze (ASTM B103)
Available only as Belleville Springs. Operating temperature range: -400° F to 300° F (-240° C to 150° C). For use with copper bus silicon bronze bolts and nuts. Also for non-magnetic requirements and good electrical conductivity. Non-magnetic. Finish: Scale-free and deburred.

Inconel 718 (ASTM B637)
Available as both Belleville Spring and Flange Washers. Operating temperature range: -400° F to 1100° F. For high temperature service in corrosive atmospheres. Indoor / outdoor service. Non-magnetic. Finish: Scale-free and deburred.

H-13 Tool Steel (ASTM A681)
Available only as Flange Washers. Operating temperature range: -250° F to 1100° F. For Indoor / outdoor high temperature service. Fully-magnetic. Finish: Machined and lightly oiled.

Material certifications, certificates of compliance, load deflection curves and load test data are available upon request.