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10 inch

Double-Sheave-J-Block

Key to two sheave J-Block Model Numbers

J 5 D 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Double

Sheave Size – Nom. O.D.

Sheave Bearing:

B = Bronze Bushed
R= Roller Bearing

 Hook-Thrust Bearing

Cheek Weights:
A = No wts.
AB = Med. wts.
B = Std. wts.
C = X-Heavy wts.


Model WT. A B E F H J K
Overall Net Thick- Width Throat-Opening Hook Hook
Length
Length
ness
w/ Latch
Thick.
Width
J-5D10BTA 125 25 23.125 6.125 14 1.39 1.81 1.38
J-5D10BTB 200 25 23.125 8.375 14 1.39 1.81 1.38
J-5D10RTA 125 25 23.125 6.125 14 1.39 1.81 1.38
J-5D10RTB 200 25 23.125 8.375 14 1.39 1.81 1.38
J-10D10BTA 140 27.125 24.500 6.125 14 1.91 2.53 1.93
J-10D10BTB 210 27.125 24.500 8.375 14 1.91 2.53 1.93
J-10D10RTA 140 27.125 24.500 6.125 14 1.91 2.53 1.93
J-10D10RTB 210 27.125 24.500 8.375 14 1.91 2.53 1.93
J-15D10BTA 140 27.125 24.500 6.125 14 1.91 2.53 1.93
J-15D10BTB 210 27.125 24.500 8.375 14 1.91 2.53 1.93
J-15D10RTA 140 27.125 24.500 6.125 14 1.91 2.53 1.93
J-15D10RTB 210 27.125 24.500 8.375 14 1.91 2.53 1.93
J-20D10BTA 203 32.500 28.750 6.625 14 2.80 3.00 2.38
J-20D10BTB 275 32.500 28.750 8.875 14 2.80 3.00 2.38
J-20D10RTA 203 32.500 28.750 6.625 14 2.80 3.00 2.38
J-20D10RTB 275 32.500 28.750 8.875 14 2.80 3.00 2.38


Dead End Chart

Wire Rope Size T U For Pin Size
7/16" thru 5/8" 1 1.28 1-1/4
3/4" thru 1" 1.25 1.65 1-5/8
1-1/8" thru 1-3/8" 1.75 2.51 2-1/2

*Gunnebo Johnson Design Factor is 4 to 1, with some exceptions;

45 Ton models 3.6 to 1

60 Ton models 3.7 to 1

325 Ton models 3.7 to 1