24 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
J55T24BTA 1147 59.375 53.250 12.750 28.75 4.63 6.13 4.00
J55T24BTB 1851 59.375 53.250 18.125 28.75 4.63 6.13 4.00
J55T24BTC 2311 59.375 53.250 24.625 28.75 4.63 6.13 4.00
J55T24RTA 1147 59.375 53.250 12.750 28.75 4.63 6.13 4.00
J55T24RTB 1851 59.375 53.250 18.125 28.75 4.63 6.13 4.00
J55T24RTC 2311 59.375 53.250 24.625 28.75 4.63 6.13 4.00
J60T24BTA 1147 59.375 53.250 12.750 28.75 4.63 6.13 4.00
J60T24BTB 1851 59.375 53.250 18.125 28.75 4.63 6.13 4.00
J60T24BTC 2311 59.375 53.250 24.625 28.75 4.63 6.13 4.00
J60T24RTA 1147 59.375 53.250 12.750 28.75 4.63 6.13 4.00
J60T24RTB 1851 59.375 53.250 18.125 28.75 4.63 6.13 4.00
J60T24RTC 2311 59.375 53.250 24.625 28.75 4.63 6.13 4.00
J70T24BTA 1180 59.625 53.375 12.750 28.75 4.36 6.25 4.50
J70T24BTB 1884 59.625 53.375 18.125 28.75 4.36 6.25 4.50
J70T24BTC 2344 59.625 53.375 24.625 28.75 4.36 6.25 4.50
J70T24RTA 1180 59.625 53.375 12.750 28.75 4.36 6.25 4.50
J70T24RTB 1884 59.625 53.375 18.125 28.75 4.36 6.25 4.50
J70T24RTC 2344 59.625 53.375 24.625 28.75 4.36 6.25 4.50
J75T24BTA 1372 64 57 12.875 28.75 4.75 6.75 4.75
J75T24BTB 2077 64 57 18.875 28.75 4.75 6.75 4.75
J75T24BTC 2537 64 57 25.375 28.75 4.75 6.75 4.75
J75T24RTA 1372 64 57 12.875 28.75 4.75 6.75 4.75
J75T24RTB 2077 64 57 18.875 28.75 4.75 6.75 4.75
J75T24RTC 2537 64 57 25.375 28.75 4.75 6.75 4.75
J80T24BTA 1372 64 57 12.875 28.75 4.75 6.75 4.75
J80T24BTB 2077 64 57 18.875 28.75 4.75 6.75 4.75
J80T24BTC 2537 64 57 25.375 28.75 4.75 6.75 4.75
J80T24RTA 1372 64 57 12.875 28.75 4.75 6.75 4.75
J80T24RTB 2077 64 57 18.875 28.75 4.75 6.75 4.75
J80T24RTC 2537 64 57 25.375 28.75 4.75 6.75 4.75
J90T24BTA 1651 65.125 57.500 13.375 28.75 4.77 7.63 5.50
J90T24BTB 2357 65.125 57.500 19.375 28.75 4.77 7.63 5.50
J90T24BTC 2817 65.125 57.500 25.875 28.75 4.77 7.63 5.50
J90T24RTA 1651 65.125 57.500 13.375 28.75 4.77 7.63 5.50
J90T24RTB 2357 65.125 57.500 19.375 28.75 4.77 7.63 5.50
J90T24RTC 2817 65.125 57.500 25.875 28.75 4.77 7.63 5.50
J100T24BTA 1651 65.125 57.500 13.375 28.75 4.77 7.63 5.50
J100T24BTB 2357 65.125 57.500 19.375 28.75 4.77 7.63 5.50
J100T24BTC 2817 65.125 57.500 25.875 28.75 4.77 7.63 5.50
J100T24RTA 1651 65.125 57.500 13.375 28.75 4.77 7.63 5.50
J100T24RTB 2357 65.125 57.500 19.375 28.75 4.77 7.63 5.50
J100T24RTC 2817 65.125 57.500 25.875 28.75 4.77 7.63 5.50


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