Schaefer 5 Series Sit and Up Spring Block Stainless Steel Cheeks/Base

Schaefer blocks have been manufactured in the United States since 1966 and are known for their legendary strength. Blocks are made from 316 stainless steel and hard coat anodized 6061-T6 aluminum alloy while the sheaves are made of UV protected Delrin. Schaefer offers the widest range of products for building block and tackle systems. Halyard/Control Blocks are excellent for fixed position halyard, sheet or control line fairleads. Block swivels 360 degrees, tilts in all directions and is supported by a heavy gauge stainless steel sprint to prevent deck contact. Large diameter base helps distribute loads to a larger surface area than other smaller designs.

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Stainless Steel cheeks
Stainless Steel base
Delrin plain bearing sheave
Safe Working Load 1750(795kg)
C/C Fasteners 1-13/32 Inch(36mm) base diameter 2-7/8(73mm)