10 inch

Single-Sheave-J-Block

Key to one sheave J-Block Model Numbers

J 3 S 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Single

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 T U
Overall Net Thick
ness
Throat Opening Hook Hook Deadend Hole
Length Length Width w/Latch Thick. Width Thick. Dia.
J-3S10BTA 115 28.375 22.250 6.187 14 1.12 1.48 1.12 1.12 1.40
J-3S10BTB 185 28.375 22.250 8.375 14 1.12 1.48 1.12 1.12 1.40
J-3S10RTA 115 28.375 22.250 6.187 14 1.12 1.48 1.12 1.12 1.40
J-3S10RTB 185 28.375 22.250 8.375 14 1.12 1.48 1.12 1.12 1.40
J-5S10BTA 120 29.625 23.125 6.187 14 1.39 1.81 1.38 1.12 1.40
J-5S10BTB 190 29.625 23.125 8.375 14 1.39 1.81 1.38 1.12 1.40
J-5S10RTA 120 29.625 23.125 6.187 14 1.39 1.81 1.38 1.12 1.40
J-5S10RTB 190 29.625 23.125 8.375 14 1.39 1.81 1.38 1.12 1.40
J-10S10BTA 130 31.750 24.500 6.187 14 1.91 2.53 1.93 1.12 1.40
J-10S10BTB 200 31.750 24.500 8.375 14 1.91 2.53 1.93 1.12 1.40
J-10S10RTA 130 31.750 24.500 6.187 14 1.91 2.53 1.93 1.12 1.40
J-10S10RTB 200 31.750 24.500 8.375 14 1.91 2.53 1.93 1.12 1.40
J-15S10BTA 130 31.750 24.500 6.437 14 1.91 2.53 1.93 1.37 1.65
J-15S10BTB 200 31.750 24.500 8.375 14 1.91 2.53 1.93

1.37

1.65
J-15S10RTA 130 31.750 24.500 6.437 14 1.91 2.53 1.93 1.37 1.65
J-15S10RTB 200 31.750 24.500 8.375 14 1.91 2.53 1.93 1.37 1.65

*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