Harken Self-contained sheavesÂ are designed for sailors to use in custom applications.
The Micro, Bullet, and Big Bullet sheaves are DelrinÂ® with DelrinÂ® ball bearings. They are scored for rope. 16 mm AirBlockÂ® sheaves are DelrinÂ® and feature stainless ball bearings that ride in a grooved race. Midrange sheaves come in either DelrinÂ® or aluminum for wire. Use Cruising ESP sheaves to handle high static loads from halyards and reef lines. Sheaves are carbon-black DelrinÂ® for UV protection and turn on stainless steel spacers. Contained sideload ball bearings allow sheaves to spin freely when loads are released. Sheaves require a sideplate for the sideload balls to roll on.
About Ronstan Sheaves
Precision mouldedÂ Acetal ball bearing sheavesÂ running on Acetal or TorlonÂ® ball bearings provide high performance & low friction. These U.V. resistant acetal sheaves operate with Minimum friction under moderate loads Â Ronstan Acetal oilite bearing sheavesÂ feature self lubricating Oilite Bronze bearings for greater load capacity and long life. Oilite bearings are produced from oil-impregnated high strength Bronze, which ensures that the surface is always lubricated.
Ronstan Nylatron sheavesÂ are made from a unique plastic material which is suitable for use with wire. NylatronÂ® is a cast, partially cross-linked polyamide compound which has been modified with a MoS2 filler. It has excellent wear resistance, self lubrication and low friction properties.
Ronstan's range of Acetal sheaves is moulded from a specially modified ultra-violet resistant grade of material to provide a long service life in the tough marine environment. Acetal is well suited to the application, with characteristics of high strength and resistance to impact and wear. It also exhibits excellent low friction properties for bearing applications. TheseÂ Roller Ball Bearing Sheaves from RonstanÂ are manufactured to operate with low friction under load.Â
About Shaefer Sheaves
Schaefer's Blocks rely on a variety of sheaves designs and scorings. Schaefer sheaves are design to be compatible with Schaefer products. There is a risk of incompatibility or failure when using Schaefer sheaves in blocks manufactued by anyone other than Schaefer Marine. TheSchaefer Aluminum SheaveÂ configuration accommodates both line and wire, providing a chafe-free surface for line while giving full support to wire to prevent flattening. Hardcoat Anodized 60601-T6 Aluminum offers superior strength and corrosion resistance.Â