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30 inch

Eight-Sheave-J-Block

Key to eight sheave J-Block Model Numbers

J 350 OCT 30 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

OCT = 8
Eight

Sheave Size – Nom. O.D.

Sheave Bearing:

B = Bronze Bushed
T= Tapered Roller Bearing

 Hook-Thrust Bearing

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


Model WT. A B E F H J K
Overall Net Thickness Throat

Opening

 Hook Hook
Length Length   Width w/Latch Thick. Width
J350OCT30BTA 10,217 106.625 80.875 41 35.750 18.250 12 7.250
J350OCT30BTB 10,965 106.625 80.875 42.5 35.750 18.250 12 7.250
J350OCT30BTC 11,667 106.625 80.875 44.5 35.750 18.250 12 7.250
J350OCT30TTA 10,217 106.625 80.875 41 35.750 18.250 12 7.250
J350OCT30TTB 10,965 106.625 80.875 42.5 35.750 18.250 12 7.250
J350OCT30TTC 11,667 106.625 80.875 44.5 35.750 18.250 12 7.250

*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