24 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- Throat Opening Hook Hook
Length Length ness Width w/Latch Thick. Width
J35D24BTA 548 52.625 48.375 7.750 28.75 3.27 4.25 3.38
J35D24BTB 1251 52.625 48.375 14.687 28.75 3.27 4.25 3.38
J35D24BTC 1711 52.625 48.375 21.187 28.75 3.27 4.25 3.38
J35D24RTA 548 52.625 48.375 7.750 28.75 3.27 4.25 3.38
J35D24RTB 1251 52.625 48.375 14.687 28.75 3.27 4.25 3.38
J35D24RTC 1711 52.625 48.375 21.187 28.75 3.27 4.25 3.38
J40D24BTA 913 55.125 50.875 8.625 28.75 3.27 4.25 3.38
J40D24BTB 1617 55.125 50.875 15.562 28.75 3.27 4.25 3.38
J40D24BTC 2077 55.125 50.875 22.062 28.75 3.27 4.25 3.38
J40D24RTA 913 55.125 50.875 8.625 28.75 3.27 4.25 3.38
J40D24RTB 1617 55.125 50.875 15.562 28.75 3.27 4.25 3.38
J40D24RTC 2077 55.125 50.875 22.062 28.75 3.27 4.25 3.38
J45D24BTA 913 55.125 50.875 8.625 28.75 3.27 4.25 3.38
J45D24BTB 1617 55.125 50.875 15.562 28.75 3.27 4.25 3.38
J45D24BTC 2077 55.125 50.875 22.062 28.75 3.27 4.25 3.38
J45D24RTA 913 55.125 50.875 8.625 28.75 3.27 4.25 3.38
J45D24RTB 1617 55.125 50.875 15.562 28.75 3.27 4.25 3.38
J45D24RTC 2077 55.125 50.875 22.062 28.75 3.27 4.25 3.38
J55D24BTA 989 59.375 53.250 8.625 28.75 4.63 6.13 4.00
J55D24BTB 1692 59.375 53.250 15.562 28.75 4.63 6.13 4.00
J55D24BTC 2152 59.375 53.250 22.062 28.75 4.63 6.13 4.00
J55D24RTA 989 59.375 53.250 8.625 28.75 4.63 6.13 4.00
J55D24RTB 1692 59.375 53.250 15.562 28.75 4.63 6.13 4.00
J55D24RTC 2152 59.375 53.250 22.062 28.75 4.63 6.13 4.00
J60D24BTA 989 59.375 53.250 8.625 28.75 4.63 6.13 4.00
J60D24BTB 1692 59.375 53.250 15.562 28.75 4.63 6.13 4.00
J60D24BTC 2152 59.375 53.250 22.062 28.75 4.63 6.13 4.00
J60D24RTA 989 59.375 53.250 8.625 28.75 4.63 6.13 4.00
J60D24RTB 1692 59.375 53.250 15.562 28.75 4.63 6.13 4.00
J60D24RTC 2152 59.375 53.250 22.062 28.75 4.63 6.13 4.00
J70D24BTA 997 59.625 53.375 8.625 28.75 4.36 6.25 4.50
J70D24BTB 1700 59.625 53.375 15.562 28.75 4.36 6.25 4.50
J70D24BTC 2160 59.625 53.375 22.062 28.75 4.36 6.25 4.50
J70D24RTA 997 59.625 53.375 8.625 28.75 4.36 6.25 4.50
J70D24RTB 1700 59.625 53.375 15.562 28.75 4.36 6.25 4.50
J70D24RTC 2160 59.625 53.375 22.062 28.75 4.36 6.25 4.50
J75D24BTA 1219 64 57 12.750 28.75 4.75 6.75 4.75
J75D24BTB 1925 64 57 15.687 28.75 4.75 6.75 4.75
J75D24BTC 2385 64 57 22.187 28.75 4.75

6.75

4.75
J75D24RTA 1219 64 57 12.750 28.75 4.75 6.75 4.75
J75D24RTB 1925 64 57 15.687 28.75 4.75 6.75 4.75
J75D24RTC 2385 64 57 22.187 28.750 4.75 6.75 4.75
J80D24BTA 1219 64 57 12.750 28.75 4.75 6.75 4.75
J80D24BTB 1925 64 57 15.687 28.75 4.75 6.75 4.75
J80D24BTC 2385 64 57 22.187 28.75 4.75 6.75 4.75
J80D24RTA 1219 64 57 12.750 28.75 4.75 6.75 4.75
J80D24RTB 1925 64 57 15.687 28.75 4.75 6.75 4.75
J80D24RTC 2385 64 57 22.187 28.75 4.75 6.75 4.75


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