| Bottom Outside Diameter (A) | 3.25 in |
| Top Outside Diameter (B) | 2.40 in |
| Mounting Hole Diameter (C) | 1.25 in |
| Inside Diameter (D) | .78 in |
| Height (E) | 1.40 in |
| Step (F) | .30 in |
| Compression Spring Rate | 2800 lb/in |
| Compression Maximum Recommended Deflection | .21 in |
| Compression Load at Maximum Deflection | 580 lb |
| Durometer | 50 |
| Elastomer | Natural Rubber |
| Dimensional CAD Drawing (pdf) | |
| Additional Product Information |
K521, K521F & K521X Deflection Graph28.jpg |
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