16 inch

Four-Sheave-J-Block

Key to four sheave J-Block Model Numbers

J 15 Q 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Q=4
Quadruple

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
J30Q16BTA 517 38.250 34.500 11.250 20.125 3.28 3.50 3.00
J30Q16BTB 673 38.250 34.500 14.625 20.125 3.28 3.50 3.00
J30Q16BTC 819 38.250 34.500 17.125 20.125 3.28 3.50 3.00
J30Q16RTA 517 38.250 34.500 11.250 20.125 3.28 3.50 3.00
J30Q16RTB 673 38.250 34.500 14.625 20.125 3.28 3.50 3.00
J30Q16RTC 819 38.250 34.500 17.125 20.125 3.28 3.50 3.00
J35Q16BTA 580 44 39.750 11.250 20.125 3.27 4.25 3.38
J35Q16BTB 735 44 39.750 14.625 20.125 3.27 4.25 3.38
J35Q16BTC 881 44 39.750 17.125 20.125 3.27 4.25 3.38
J35Q16RTA 580 44 39.750 11.250 20.125 3.27 4.25 3.38
J35Q16RTB 735 44 39.750 14.625 20.125 3.27 4.25 3.38
J35Q16RTC 881 44 39.750 17.125 20.125 3.27 4.25 3.38
J40Q16BTA 600 45.375 41.125 11.250 20.125 3.27 4.25 3.38
J40Q16BTB 756 45.375 41.125 14.625 20.125 3.27 4.25 3.38
J40Q16BTC 902 45.375 41.125 17.125 20.125 3.27 4.25 3.38
J40Q16RTA 600 45.375 41.125 11.250 20.125 3.27 4.25 3.38
J40Q16RTB 756 45.375 41.125 14.625 20.125 3.27 4.25 3.38
J40Q16RTC 902 45.375 41.125 17.125 20.125 3.27 4.25 3.38
J45Q16BTA 600 45.375 41.125 11.250 20.125 3.27 4.25 3.38
J45Q16BTB 756 45.375 41.125 14.625 20.125 3.27 4.25 3.38
J45Q16BTC 902 45.375 41.125 17.125 20.125 3.27 4.25 3.38
J45Q16RTA 600 45.375 41.125 11.250 20.125 3.27 4.25 3.38
J45Q16RTB 756 45.375 41.125 14.625 20.125 3.27 4.25 3.38
J45Q16RTC 902 45.375 41.125 17.125 20.125 3.27 4.25 3.38
J50Q16BTA 787 50 43.875 14.875 20.125 4.63 6.13 4.00
J50Q16BTB 942 50 43.875 17.500 20.125 4.63 6.13 4.00
J50Q16BTC 1088 50 43.875 20 20.125 4.63 6.13 4.00
J50Q16RTA 787 50 43.875 14.875 20.125 4.63 6.13 4.00
J50Q16RTB 942 50 43.875 17.500 20.125 4.63 6.13 4.00
J50Q16RTC 1088 50 43.875 20 20.125 4.63 6.13 4.00
J55Q16BTA 787 50 43.875 14.875 20.125 4.63 6.13 4.00
J55Q16BTB 942 50 43.875 17.500 20.125 4.63 6.13 4.00
J55Q16BTC 1088 50 43.875 20 20.125 4.63 6.13 4.00
J55Q16RTA 787 50 43.875 14.875 20.125 4.63 6.13 4.00
J55Q16RTB 942 50 43.875 17.500 20.125 4.63 6.13 4.00
J55Q16RTC 1088 50 43.875 20 20.125 4.63 6.13 4.00
J60Q16BTA 787 50 43.875 14.875 20.125 4.63 6.25 4.50
J60Q16BTB 942 50 43.875 17.500 20.125 4.63 6.25 4.50
J60Q16BTC 1088 50 43.875 20 20.125 4.63 6.25 4.50
J60Q16RTA 787 50 43.875 14.875 20.125 4.63 6.25 4.50
J60Q16RTB 942 50 43.875 17.500 20.125 4.63 6.25 4.50
J60Q16RTC 1088 50 43.875 20 20.125 4.63 6.25 4.50
J70Q16BTA 836 50.250 44 14.875 20.125 4.36 6.25 4.50
J70Q16BTB 991 50.250 44 17.500 20.125 4.36 6.25 4.50
J70Q16BTC 1137 50.250 44 20 20.125 4.36 6.25 4.50
J70Q16RTA 836 50.250 44 14.875 20.125 4.36 6.25 4.50
J70Q16RTB 991 50.250 44 17.500 20.125 4.36 6.25 4.50
J70Q16RTC 1137 50.250 44 20 20.125 4.36 6.250 4.50
J80Q16BTA 879 56.625 49.625 15 20.125 4.75 6.75 4.75
J80Q16BTB 1033 56.625 49.625 17.500 20.125 4.75 6.75 4.75
J80Q16BTC 1179 56.625 49.625 20 20.125 4.75 6.75 4.75
J80Q16RTA 879 56.625 49.625 15 20.125 4.75 6.75 4.75
J80Q16RTB 1033 56.625 49.625 17.500 20.125 4.75 6.75 4.75
J80Q16RTC 1179 56.625 49.625 20 20.125 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