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1. Deflected Height (H1)
This is the height to which the washer should be compressed to measure the load "P1".
2. Inside Diameter (ID)
Washers were designed to fit over a rod as published in the catalog. Therefore, the I.D. values are greater than the listed minimums. This allows for sufficient clearance when the washer is deflected.
3. Load at flat (P flat)
This is the theoretical load at flat used for design purposes. Load testing at flat is inaccurate due to the inability for exact height measurements at the flat position. Also, when nearing flat, Belleville washers tend to experience a change in contact points. This change results in an increase in load over the theoretical near-flat.
4. Load P1 (P1)
The catalog lists ranges for the load which can be expected when the washer is deflected to the height "H1". The loads are based upon a process capability index of 1.33 Cpk. Note: When load-testing Belleville washers, it is imperative that extremely accurate height measurements be taken. Accuracy should be to .0001".
5. Outside Diameter (OD)
Washers were designed to fit into hole as published in the catalog. Therefore, the O.D. values are less than the listed maximums. This allows for sufficient clearance when the washer is deflected.
6. Overall Height (H)
The overall height "H" is an approximate value. It is slightly adjusted around the published value at manufacturing to meet the load "P1" at the deflected Height "H1". It should be noted that the height is the only variable that is adjustable in the manufacturing process due to the O.D., I.D. and material thickness being fixed.
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