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Stock sizes in high-carbon and stainless steels
Belleville spring washers are especially suited for high loads
in small spaces. By combining them in varying sequence, each
size gives numerous load-carrying possibilities. These washers
have had all set removed during manufacture.
Material
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Spring Steel
Commercial - 1074 - Certified to ASTM-A684 |
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Stainless steel
Thicknesses up to and including 0.072 in.
Commercial - Type 302
Government - AMS 5906 Type 302 Chemistry only
Thicknesses over 0.072 in.
Commercial - Type 17-7 PH certified to AMS 5528 |
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No charge for certificate
of compliance when requested; certificate of chemical
analysis available, see price book. |
Tolerances
Contact our engineering department for tolerances.
Typical load-deflection curves for three characteristic proportions
of washers listed are as shown in Fig. 2. From them, loads
at intermediate heights may be estimated. The nominal amount
of dish or cone (h) is found by subtracting "t" from "H".
Example
Using part no. B1250-040, estimate the load at 75% of deflection:
h = H - t = 0.082 - 0.040 = 0.042
h ÷ t = 0.042 ÷ 0.040 = 1 approx.
From Fig. 2, using the curve "h = t", the load at 75% of
the deflection is 87% of the load at flat position. From the
table, calculated load at flat is 330 lb.; .87 x 330 = 287
lb. The typical curves in Fig. 2 are shown with dotted lines
beyond 75% of deflection to indicate that load characteristics
in this area are not reliable because of partial bottoming
of the washers.
Stacked Belleville Spring Washers
Since the deflection in a single belleville spring washer
is relatively small, it is often necessary to combine a number
of washers. Stacking them in series increases the deflection
in proportion to the number of washers, the load remaining
the same as with a single washer.
In order to increase the load, the washers may be stacked
in parallel as shown in Fig. 1. Theoretically, this increases
the load in proportion to the number of washers. However,
friction between the washers causes an apparent "hysteresis"
in the load-deflection curve as illustrated in Fig. 3. This
figure shows test curves made on laboratory equipment without
vibration using part no. B1000-035. The width of the "hysteresis"
loop is in the order of 6% for each washer added in parallel,
but it may vary with lubrication and surface finish and may
change during the life of the mechanism due to burnishing
of adjacent surfaces. The test curve in Fig. 3 for five in
parallel also illustrates the extra deflection which occurs
due to imperfect nesting of the washers. The graph in Fig.
3 is labeled to show the loads and deflections of the single
washers in the stacks.
A stack of washers may be installed either on a rod or in
a cylinder. For dynamic applications the guides should be
hardened to Rockwell C48 minimum. Also hardened flat end plates
may be added to prevent indenting adjacent parts.
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Belleville Spring Washers For Flange Applications
Stock sizes in stainless steels
SPEC flange bellevilles are designed to compensate for thermal
expansion and mechanical shock associated with bolted joints.
Typical applications include valves, pipe connections, pump
connections and compression joints. These washers have had
all set removed during manufacture.
Material
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Stainless steel
Commercial - Type 17-7 PH |
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Maximum application temperature
for 17-7 PH is 570 deg F (300 deg C). |
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Certificate of chemical
analysis available at extra cost. |
Stacked belleville washers
Additional load or deflection can be obtained by the stacking
of bellevilles in series or parallel. See the standard line
of belleville spring washers for information on stacking of
belleville washers.
Load tolerances
Load tolerances are plus or minus 20.0% of the values shown.
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High Load Belleville Spring Washers
Stock sizes in high-carbon steel
SPEC high load belleville washers provide loads which are
substantially greater than our standard washers of similar
diameters. These washers have had all set removed during manufacture
since most applications are static applications. Set generally
is removed during installation which results in a reduction
of the free height.
Material
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Carbon spring steel C1070-C1075
or chrome vanadium based on availability at time of manufacture.
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Certificate of chemical
analysis available at extra cost. |
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Parts made from 17-7 PH
are available as a special order. |
Stacked belleville washers
Additional load or deflection can be obtained by the stacking
of bellevilles in series or parallel. See the standard line
of belleville spring washers for information on stacking of
belleville washers.
Loads
Maximum load is achieved at flat. Loads are calculated values.
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Metric Disc Spring Washers
Stock sizes in high-carbon or chrome vanadium
All SPEC Disc washers are manufactured to the European Din
2093 specification. These designs are the same reliable designs
that have been sold for years in Europe by Associated Spring.
Additional Din sizes are available upon request.
Material
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Material thickness less
than 1.25 mm - Carbon Steel per C1074 - 1075. |
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Material thickness 1.25
mm and up. |
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Chrome Vanadium per SAE
6150. |
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Certificate of chemical
analysis availableat extra cost. |
Stacked disc springs
Additional load or deflection can be obtained by stacking
disc springs in series or parallel. See section on standard
belevilles.
Load tolerances
Diameter tolerances I.D. - O.D. + 0.013 mm - 0.077 mm
Material thickness Less than 1.25 mm, + 25.0% - 7.5%
1.25 mm to 3.0 mm, + 15.0% - 7.5%
3.1 mm to 6.0 mm, + 10.0% - 5.0%
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