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16 inch

Single-Sheave-J-Block

Key to one sheave J-Block Model Numbers

J 3 S 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Single

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 T U
Overall Net Thick- Throat Opening Hook Hook Deadend Hole
Length Length ness Width w/Latch Thick. Width Thick. Dia.
J15S16BTA 216 37.375 30.25 6.437 20.125 1.91 2.625 1.937 1.37 1.65
J15S16BTB 371 37.375 30.25 9.562 20.125 1.91 2.625 1.937 1.37 1.65
J15S16BTC 517 37.375 30.25 12.062 20.125 1.91 2.625 1.937 1.37 1.65
J15S16RTA 216 37.375 30.25 6.437 20.125 1.91 2.625 1.937 1.37 1.65
J15S16RTB 371 37.375 30.25 9.562 20.125 1.91 2.625 1.937 1.37 1.65
J15S16RTC 517 37.375 30.25 12.062 20.125 1.91 2.625 1.937 1.37 1.65
J20S16BTA 278 42.750 34.50 6.687 20.125 2.80 3.750 3 1.37 1.65
J20S16BTB 434 42.750 34.50 10.062 20.125 2.80 3.750 3 1.37 1.65
J20S16BTC 580 42.750 34.50 12.562 20.125 2.80 3.750 3 1.37 1.65
J20S16RTA 278 42.750 34.50 6.687 20.125 2.80 3.750 3 1.37 1.65
J20S16RTB 434 42.750 34.50 10.062 20.125 2.80 3.750 3 1.37 1.65
J20S16RTC 580 42.750 34.50 12.562 20.125 2.80 3.750 3 1.37 1.65
J25S16BTA 278 43.250 34.50 6.687 20.125 2.80 3.750 3 1.50 1.65
J25S16BTB 434 43.250 34.50 10.062 20.125 2.80 3.750 3 1.50 1.65
J25S16BTC 580 43.250 34.50 12.562 20.125 2.80 3.750 3 1.50 1.65
J25S16RTA 278 43.250 34.50 6.687 20.125 2.80 3.750 3 1.50 1.65
J25S16RTB 434 43.250 34.50 10.062 20.125 2.80 3.750 3 1.50 1.65
J25S16RTC 580 43.250 34.50 12.562 20.125 2.80 3.750 3 1.50 1.65
J30S16BTA 291 45.250 36.50 6.687 20.125 3.28 3.50 3 1.50 1.65
J30S16BTB 447 45.250 36.50 10.062 20.125 3.28 3.50 3 1.50 1.65
J30S16BTC 593 45.250 36.50 12.562 20.125 3.28 3.50 3 1.50 1.65
J30S16RTA 291 45.250 36.50 6.687 20.125 3.28 3.50 3 1.50 1.65
J30S16RTB 447 45.250 36.50 10.062 20.125 3.28 3.50 3 1.50 1.65
J30S16RTC 593 45.250 36.50 12.562 20.125 3.28 3.50 3 1.50 1.65

*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