I have been replacing just the rusty nuts and washers on my S22's keel bolts. I have come to believe the 8-3/4" steel keel bolts are more than adequate for the Santana 22 . First of all - please read the Pearson 26 keel bolt article in the prior link. Notice that the P26 keel is 1000 lbs heavier than a S22's Keel and the P26 uses just 8-5/8" bolts. pi= 3.141593 Keel bolt Area =pi * r^2 Diameter Radius Area P26 D=5/8 R=5/16 A=0.061328 S22 D=3/4 R=3/8 A=0.147188

The surface area of 3/4" bolt is over twice the area of the 5/8" bolt. The strength of the bolt must correlate with this surface area. So S22s owners have keel bolts with over twice the strength holding half the keel weight. Seems like the S22 keel structure is a tad over built ;^)