18 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
J25T18BTA 566 37.375 34.375 10.75 22.75 2.80 3.00 2.38
J25T18BTB 793 37.375 34.375 14 22.75 2.80 3.00 2.38
J25T18BTC 931 37.375 34.375 15.75 22.75 2.80 3.00 2.38
J25T18RTA 566 37.375 34.375 10.75 22.75 2.80 3.00 2.38
J25T18RTB 793 37.375 34.375 14 22.75 2.80 3.00 2.38
J25T18RTC 931 37.375 34.375 15.75 22.75 2.80 3.00 2.38
J30T18BTA 600 39.875 36.125 10.75 22.75 3.28 3.50 3.00
J30T18BTB 827 39.875 36.125 14 22.75 3.28 3.50 3.00
J30T18BTC 965 39.875 36.125 15.75 22.75 3.28 3.50 3.00
J30T18RTA 600 39.875 36.125 10.75 22.75 3.28 3.50 3.00
J30T18RTB 827 39.875 36.125 14 22.75 3.28 3.50 3.00
J30T18RTC 965 39.875 36.125 15.75 22.75 3.28 3.50 3.00
J35T18BTA 662 45.625 41.375 10.75 22.75 3.27 4.25 3.38
J35T18BTB 889 45.625 41.375 14 22.75 3.27 4.25 3.38
J35T18BTC 1027 45.625 41.375 15.75 22.75 3.27 4.25 3.38
J35T18RTA 662 45.625 41.375 10.75 22.75 3.27 4.25 3.38
J35T18RTB 889 45.625 41.375 14 22.75 3.27 4.25 3.38
J35T18RTC 1027 45.625 41.375 15.75 22.75 3.27 4.25 3.38
J40T18BTA 788 49.125 44.875 11.25 22.75 3.27 4.25 3.38
J40T18BTB 1014 49.125 44.875 14.50 22.75 3.27 4.25 3.38
J40T18BTC 1152 49.125 44.875 16.25 22.75 3.27 4.25 3.38
J40T18RTA 788 49.125 44.875 11.25 22.75 3.27 4.25 3.38
J40T18RTB 1014 49.125 44.875 14.50 22.75 3.27 4.25 3.38
J40T18RTC 1152 49.125 44.875 16.25 22.75 3.27 4.25 3.38
J45T18BTA 788 49.125 44.875 11.25 22.75 3.27 4.25 3.38
J45T18BTB 1014 49.125 44.875 14.50 22.75 3.27 4.25 3.38
J45T18BTC 1152 49.125 44.875 16.25 22.75 3.27 4.25 3.38
J45T18RTA 788 49.125 44.875 11.25 22.75 3.27 4.25 3.38
J45T18RTB 1014 49.125 44.875 14.50 22.75 3.27 4.25 3.38
J45T18RTC 1152 49.125 44.875 16.25 22.75 3.27 4.25 3.38
J55T18BTA 872 53.500 47.375 12.75 22.75 4.63 6.13 4.00
J55T18BTB 1098 53.500 47.375 14.50 22.75 4.63 6.13 4.00
J55T18BTC 1236 53.500 47.375 16.25 22.75 4.63 6.13 4.00
J55T18RTA 872 53.500 47.375 12.75 22.75 4.63 6.13 4.00
J55T18RTB 1098 53.500 47.375 14.50 22.75 4.63 6.13 4.00
J55T18RTC 1236 53.500 47.375 16.25 22.75 4.63 6.13 4.00
J60T18BTA 872 53.500 47.375 12.75 22.75 4.36 6.13 4.00
J60T18BTB 1098 53.500 47.375 14.50 22.75 4.36 6.13 4.00
J60T18BTC 1236 53.500 47.375 16.25 22.75 4.36 6.13 4.00
J60T18RTA 872 53.500 47.375 12.75 22.75 4.36 6.13 4.00
J60T18RTB 1098 53.500 47.375 14.50 22.75 4.36 6.13 4.00
J60T18RTC 1236 53.500 47.375 16.25 22.75 4.36 6.13 4.00
J70T18BTA 904 53.750 47.500 12.75 22.75 4.36 6.25 4.50
J70T18BTB 1130 53.750 47.500 14.50 22.75 4.36 6.25 4.50
J70T18BTC 1268 53.750 47.500 16.25 22.75 4.36 6.25 4.50
J70T18RTA 904 53.750 47.500 12.75 22.75 4.36 6.25 4.50
J70T18RTB 1130 53.750 47.500 14.50 22.75 4.36 6.25 4.50
J70T18RTC 1268 53.750 47.500 16.25 22.75 4.36 6.25 4.50


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