16 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
J25T16BTA 389 33.75 30.75 8.875 20.125 2.80 3.00 2.38
J25T16BTB 544 33.75 30.75 12.375 20.125 2.80 3.00 2.38
J25T16BTC 690 33.75 30.75 14.875 20.125 2.80 3.00 2.38
J25T16RTA 389 33.75 30.75 8.875 20.125 2.80 3.00 2.38
J25T16RTB 544 33.75 30.75 12.375 20.125 2.80 3.00 2.38
J25T16RTC 690 33.75 30.75 14.875 20.125 2.80 3.00 2.38
J30T16BTA 437 40 36.25 8.875 20.125 3.28 3.50 3.00
J30T16BTB 593 40 36.25 12.375 20.125 3.28 3.50 3.00
J30T16BTC 739 40 36.25 14.875 20.125 3.28 3.50 3.00
J30T16RTA 437 40 36.25 8.875 20.125 3.28 3.50 3.00
J30T16RTB 593 40 36.25 12.375 20.125 3.28 3.50 3.00
J30T16RTC 739 40 36.25 14.875 20.125 3.28 3.50 3.00
J35T16BTA 494 43.75 39.50 8.875 20.125 3.27 4.25 3.38
J35T16BTB 650 43.75 39.50 12.375 20.125 3.27 4.25 3.38
J35T16BTC 796 43.75 39.50 14.875 20.125 3.27 4.25 3.38
J35T16RTA 494 43.75 39.50 8.875 20.125 3.27 4.25 3.38
J35T16RTB 650 43.75 39.50 12.375 20.125 3.27 4.25 3.38
J35T16RTC 796 43.75 39.50 14.875 20.125 3.27 4.25 3.38
J40T16BTA 505 45.25 41 9 20.125 3.27 4.25 3.38
J40T16BTB 661 45.25 41 12.375 20.125 3.27 4.25 3.38
J40T16BTC 807 45.25 41 14.875 20.125 3.27 4.25 3.38
J40T16RTA 505 45.25 41 9 20.125 3.27 4.25 3.38
J40T16RTB 661 45.25 41 12.375 20.125 3.27 4.25 3.38
J40T16RTC 807 45.25 41 14.875 20.125 3.27 4.25 3.38
J45T16BTA 505 45.25 41 9 20.125 3.27 4.25 3.38
J45T16BTB 661 45.25 41 12.375 20.125 3.27 4.25 3.38
J45T16BTC 807 45.25 41 14.875 20.125 3.27 4.25 3.38
J45T16RTA 505 45.25 41 9 20.125 3.27 4.25 3.38
J45T16RTB 661 45.25 41 12.375 20.125 3.27 4.25 3.38
J45T16RTC 807 45.25 41 14.875 20.125 3.27 4.25 3.38


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