Also called Disc Spring or Conical Compression Washers
is a conical shaped disc that will deflect (flatten) at a given rate
is usually very high. Allowing the spring to produce very large
loads in a very small place. These springs offer high loads
with small deflections and self-damping. Normally used in
high spring load applications or vibration, thermal expansion,
relaxation and bolt creep problem areas. 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.

PRODUCT APPLICATIONS
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. Listed below are some areas of industrial application where belleville springs are used.

GENERAL FEATURES
Belleville Spring, Disc Spring, Conical Compression Washer are all names for the same type of spring. (see below)

ADVANTAGES

Belleville Springs offer a number of advantages:

• Efficient use of space
• High spring loads with small deflections
• Self damping
• Long service life
• Load-deflection curves which can be designed for various applications ranging from linear rates to negative rates
• Stacking in "parallel" to increase load
• Stacking in "series" to increase deflection
• Simple adjustment of the load and deflection of a spring stack by adding or removing individual springs
• Rounded edges to reduce stresses (Fp)

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.

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.

Belleville Springs can be used in four ways.

1. Single, one spring
2. Parallel, all springs stacked the same way to increase load
3. Series, all springs stacked opposite each other to increase deflection
4. Parallel-series, A combination of #2 and # 3
   
   Load – deflection curves, which can be designed for applications ranging from linear to negative rates.

ID - Inside Diameter OD - Outside Diameter t - Thickness h - Deflection H - Overall Height Fp - Rounded Edges Load is The force in lbs. to "Push" the spring into the flat position.

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.

MATERIAL TYPES & DESCRIPTIONS

AISI 6150 Alloy (ASTM A506)
Available only as Belleville Spring Washers. Operating temperature range: -40° F to 350° F. For indoor/outdoor service, electrical and mechanical. Fully magnetic. Finish: All washers are completely scale-free and deburred.

1. Mechanically zinc plated .0005" thick, minimum, with a clear chromate dip (per ASTM B695, Class 12, Type I).
2. Mechanically zinc plated .0005" thick, minimum, with a yellow chromate dip (per ASTM B695, Class 12, Type II).
3. Plain finish, scale free.
4. Light oil protective coating.

Black Oxide oil coat. Available only as Belleville Spring Washers.

AISI 1074 High Carbon Steel (ASTM A684, AMS 5120H)
Operating temperature range: -40° F to 350° F. For indoor/outdoor service, electrical and mechanical. Fully magnetic. Finish: All washers are completely scale-free and deburred.

1. Mechanically zinc plated .0005" thick, minimum, with a clear chromate dip (per ASTM B695, Class 12, Type I).
2. Mechanically zinc plated .0005" thick, minimum, with a yellow chromate dip (per ASTM B695, Class 12, Type II).
3. Plain finish, scale free.
4. Light oil protective coating.
5. Black Oxide oil coat.

AISI 301 Stainless Steel (ASTM A666, AMS 5519)

Available only as Belleville Spring Washers. Operating temperature range: -400° F to 550° F. 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. 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. 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.