Mechanical Compression Springs



Belleville Springs

Belleville Springs

Raymond Asia

Belleville Spring Washers
Belleville Spring Washers

Belleville Spring Washers
for Flange Applications
Belleville Spring Washers

High Load Belleville Washers
Belleville Spring Washers

Metric Disc Spring Washers
Belleville Spring Washers

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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
Spring Steel
Commercial - 1074 - Certified to ASTM-A684
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
No charge for certificate of compliance when requested; certificate of chemical analysis available, see price book.

Tolerances
Contact our engineering department for tolerances.

Raymond Asia

Raymond Asia

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
Stainless steel
Commercial - Type 17-7 PH
Maximum application temperature for 17-7 PH is 570 deg F (300 deg C).
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
Carbon spring steel C1070-C1075 or chrome vanadium based on availability at time of manufacture.
Certificate of chemical analysis available at extra cost.
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
Material thickness less than 1.25 mm - Carbon Steel per C1074 - 1075.
Material thickness 1.25 mm and up.
Chrome Vanadium per SAE 6150.
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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Extension Springs