Schaefer Over the Top Blocks

Schaefer Over the Top Blocks

Schaefer Over the Top Blocks are designed for bringing control lines over the forward edge of cabin houses, coamings, or rails. These Schaefer blocks have ball bearing sheaves that provide low friction. Stainless steel construction. All require 6x #10 (5 mm) RH fasteners. Hole spacing shown is for the forward and aft most holes along the side. The third hole is centered between them along the side.

Part # Description Sheave Dia. Max Line Dia. Length Width Overall Height Sheave Height Hole Spacing (On Side) Safe Working Load Weight
in mm in mm in mm in mm in mm in mm in mm lb kg oz g
SC30040 Single 1 7/16 36 1/2 13 2 11/32 60 2 51 2 11/32 60 1 13/32 36 1 25/32 45 650 295 4.7 133
SC30041 Double 1 7/16 36 1/2 13 2 11/32 60 2 11/16 68 2 11/32 60 1 13/32 36 1 25/32 45 650 295 7.2 204
SC30042 Triple 1 7/16 36 1/2 13 2 11/32 60 3 3/8 86 2 11/32 60 1 13/32 36 1 25/32 45 650 295 10.0 328
SC50640 Single 2 51 1/2 13 2 7/8 73 2 1/16 52 2 15/16 74 2 51 2 5/16 59 1000 450 8.4 283
SC50641 Double 2 51 1/2 13 2 7/8 73 2 3/16 71 2 15/16 74 2 51 2 5/16 59 1000 450 12.6 357
SC50642 Triple 2 51 1/2 13 2 7/8 73 3 17/32 90 2 15/16 74 2 51 2 5/16 59 1000 450 17.0 482
SC70640 Single 2 3/8 60 1/2 13 2 7/8 73 2 1/4 57 3 7/16 87 2 5/16 58 2 13/16 72 1200 545 11.6 329
SC70641 Double 2 3/8 60 1/2 13 2 7/8 73 2 3/4 76 3 7/16 87 2 5/16 58 2 13/16 72 1200 545 18.0 510
SC70642 Triple 2 3/8 60 1/2 13 2 7/8 73 4 1/16 104 3 7/16 87 2 5/16 58 2 13/16 72 1200 545 24.4 692


SC30040 Over Top Block, Single, 1 7/16 Sheave Price: $41.00 SC30041 Over Top Block, Double, 1 7/16 Sheave Price: $79.28
SC30042 Over Top Block, Triple, 1 7/16 Sheave Price: $123.60 SC50640 Over Top Block, Single, 2 Sheave Price: $72.76
SC50641 Over Top Block, Double, 2 Sheave Price: $118.68 SC50642 Over Top Block, Triple, 2 Sheave Price: $158.00
SC70640 Over Top Block, Single, 2-3/8 Sheave Price: $95.68 SC70641 Over Top Block, Double, 2-3/8 Sheave Price: $141.36
SC70642 Over Top Block, Triple, 2-3/8 Sheave Price: $175.40
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