24 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- Throat Opening Hook Hook Deadend Hole
Length Length ness Width w/Latch Thick. Width Thick. Dia.
J30S24BTA 548 54 45.125 8.562 28.75 3.28 3.50 3 1.50 2.06
J30S24BTB 1251 54 45.125 14.687 28.75 3.28 3.50 3 1.50 2.06
J30S24BTC 1711 54 45.125 21.187 28.75 3.28 3.50 3 1.50 2.06
J30S24RTA 548 54 45.125 8.562 28.75 3.28 3.50 3 1.50 2.06
J30S24RTB 1251 54 45.125 14.687 28.75 3.28 3.50 3 1.50 2.06
J30S24RTC 1711 54 45.125 21.187 28.75 3.28 3.50 3 1.50 2.06
J35S24BTA 628 58.500 48.375 8.562 28.75 3.27 4.250 3.375 1.50 2.06
J35S24BTB 1331 58.500 48.375 14.687 28.75 3.27 4.250 3.375 1.50 2.06
J35S24BTC 1791 58.500 48.375 21.187 28.75 3.27 4.250 3.375 1.50 2.06
J35S24RTA 628 58.500 48.375 8.562 28.75 3.27 4.250 3.375 1.50 2.06
J35S24RTB 1331 58.500 48.375 14.687 28.75 3.27 4.250 3.375 1.50 2.06
J35S24RTC 1791 58.500 48.375 21.187 28.75 3.27 4.250 3.375 1.50 2.06
J40S24BTA 769 60.875 50.875 9.437 28.75 3.27 4.250 3.375 1.75 2.28
J40S24BTB 1472 60.875 50.875 15.562 28.75 3.27 4.250 3.375 1.75 2.28
J40S24BTC 1932 60.875 50.875 22.062 28.75 3.27 4.250 3.375 1.75 2.28
J40S24RTA 769 60.875 50.875 9.437 28.75 3.27 4.250 3.375 1.75 2.28
J40S24RTB 1472 60.875 50.875 15.562 28.75 3.27 4.250 3.375 1.75 2.28
J40S24RTC 1932 60.875 50.875 22.062 28.75 3.27 4.250 3.375 1.75 2.28
J55S24BTA 852 65.250 53.250 9.437 28.75 4.63 6.13 4 2 2.53
J55S24BTB 1556 65.250 53.250 15.562 28.75 4.63 6.13 4 2 2.53
J55S24BTC 2016 65.250 53.250 22.062 28.75 4.63 6.13 4 2 2.53
J55S24RTA 852 65.250 53.250 9.437 28.75 4.63 6.13 4 2 2.53
J55S24RTB 1556 65.250 53.250 15.562 28.75 4.63 6.13 4 2 2.53
J55S24RTC 2016 65.250 53.250 22.062 28.75 4.63 6.13 4 2 2.53

*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