Ronstan Series 125 Single Upright Lead BlockSheave Ø - 5 in.
Max. Rope Ø - 5/8 in.
Max. Cable Ø - in
Fastener Ø - 3/8 + 5/16 in.
M.W.L. - 8270 lb.
B. L. - 16530 lb.
Weight - 27.4 oz.
The self-contained alloy sheave packages provide reliable, low-friction performance at high loads. The high axial loads are carried by Torlon® roller needle bearings, while side thrust loads are taken up by Acetal ball bearings.
Typically used for halyards at the mast base.
Alloy sheave and housing
Torlon® needle rollers
Black carbon Acetal ball bearings