Seal's Spars & Rigging
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Masts & Booms

Seal's Spars & Rigging stocks two aluminum spar sections used as masts and booms on many boats. They are the Jensen Section, used on many of the Cal and Ranger boats, and the #375 Section/Kenyon D Section, used as booms on many boats (see below).

We can build a complete new mast or boom, or furnish you with all the necessary partsf.

A partial list of the boats that we build masts or booms for include:

Jensen Section

Cal 20
Ranger 20
Santana 21, 22

Cal 25, 27, 2-27, T-4

#375 Section / Kenyon D Section

Cal 20, 25
Santana 22
Cal 25, 27, 2-27, T-4
Ranger 23, 26
Coronado 25
Balboa 26

“Jensen” Section (also known as Famet Marine FM-B)
This is the original mast section used on the Cal 20, 21 and 24, and the Ranger 20. It is also the original boom section used on the Cal T-4, 27, 2-27, 28, 29, 30, and 2-30, and the Columbia 28.

Component parts available for this section include mast steps, goosenecks, headstay/jumper fittings, mast heads and more (see the Cal 20 parts catalog).


To place an order please proceed to our ordering information page.


“Jensen” Section
Dimensions: 2 5/8" X 4"
Wall Thickness: .100
Weight: 1.4 lbs. / ft.
Finish: Clear Anodized
Stock Lengths: 26'6" / 13'3"
Estimated Moments: IXX=2.2/IYY=1.1