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10 inch

Triple-Sheave-J-Block

Key to three sheave J-Block Model Numbers

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

Number of Sheaves

T=3
Triple

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-10T10BTA 170 25.625 23 8.375 14 1.91 2.53 1.93
J-10T10BTB 245 25.625 23 10.687 14 1.91 2.53 1.93
J-10T10RTA 170 25.625 23 8.375 14 1.91 2.53 1.93
J-10T10RTB 245 25.625 23 10.687 14 1.91 2.53 1.93
J-15T10BTA 180 25.625 23 8.375 14 1.91 2.53 1.93
J-15T10BTB 255 25.625 23 10.687 14 1.91 2.53 1.93
J-15T10RTA 180 25.625 23 8.375 14 1.91 2.53 1.93
J-15T10RTB 255 25.625 23 10.687 14 1.91 2.53 1.93
J-20T10BTA 230 28 25 8.875 14 2.80 3.00 2.38
J-20T10BTB 305 28 25 11.187 14 2.80 3.00 2.38
J-20T10RTA 230 28 25 8.875 14 2.80 3.00 2.38
J-20T10RTB 305 28 25 11.187 14 2.80 3.00 2.38
J-25T10BTA 230 28 25 8.875 14 2.80 3.00 2.38
J-25T10BTB 305 28 25 11.187 14 2.80 3.00 2.38
J-25T10RTA 230 28 25 8.875 14 2.80 3.00 2.38
J-25T10RTB 305 28 25 11.187 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