The Catalina 34 and Catalina 36 in mast furling rigs used two (2) of these sheaves along with six (6) of the 85mm sheaves, part number T1961 in the masthead. These other sizes are shown below in the "Required and Related Products".

The early Catalina 42 used a Isomat rig. This rig has a boom that used several of these sheaves for both the outhaul and the reef lines, both in the gooseneck and the boom end fitting.

Be sure to compare the dimensions of your sheaves to those listed below before ordering.

Boats that used this sheave:
• (6) per Catalina 28 masthead for furling rigs (customer reported)
• (2) per Catalina 320 masthead for non furling rigs
• (2) per Catalina 320 masthead for in mast furling rigs
• (2) per Catalina 34 masthead for in mast furling rigs
• (2) per Catalina 36 masthead for in mast furling rigs
• (6) per Catalina 42 outhaul and reef in boom (early 90's and early non furling Isomat NG-80 rig only)

• Outside diameter: 60 mm (~2-3/8")
• Inside diameter: 10 mm (~3/8")
• Width: 15 mm (~9/16")
• Line diameter: 3/8"

1) Since these spars are French, all of their products are metric. The fractional dimensions provided are the nearest equivalents.

2) Although these were supplied by the original spar manufacturer, they were not the original production run. They were the last replacement parts supplied by the manufacturer, long after production of these spars had ceased. At the time we were told by the manufacturer that "they are not the exact size as the original but they will work".

In retrospect we believe that these were slightly thicker than the original at 15mm. We now have in stock our replacement sheave we have custom machined for us, part number Z5617 below under "Required and Related Products". They are 14mm wide to match the original OEM part.