18 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 Thickness Throat Opening Hook Hook Deadend Hole
Length Length Width w/Latch Thick. Width Thick. Dia.
J-20S18BTA 389 48.5 38.625 8.562 22.75 2.80 3.75 3 1.50 2.06
J-20S18BTB 615 48.5 38.625 11.062 22.75 2.80 3.75 3 1.50 2.06
J-20S18BTC 753 48.5 38.625 12.812 22.75 2.80 3.75 3 1.50 2.06
J-20S18RTA 389 48.5 38.625 8.562 22.75 2.80 3.75 3 1.50 2.06
J-20S18RTB 615 48.5 38.625 11.062 22.75 2.80 3.75 3 1.50 2.06
J-20S18RTC 753 48.5 38.625 12.812 22.75 2.80 3.75 3 1.50 2.06
J-25S18BTA 389 48.5 38.625 8.562 22.75 2.80 3.75 3 1.50 2.06
J-25S18BTB 615 48.5 38.625 11.062 22.75 2.80 3.75 3 1.50 2.06
J-25S18BTC 753 48.5 38.625 12.812 22.75 2.80 3.75 3 1.50 2.06
J-25S18RTA 389 48.5 38.625 8.562 22.75 2.80 3.75 3 1.50 2.06
J-25S18RTB 615 48.5 38.625 11.062 22.75 2.80 3.75 3 1.50 2.06
J-25S18RTC 753 48.5 38.625 12.812 22.75 2.80 3.75 3 1.50 2.06
J-30S18BTA 404 49 39.125 8.562 22.75 3.28 3.50 3 1.50 2.06
J-30S18BTB 630 49 39.125 11.062 22.75 3.28 3.50 3 1.50 2.06
J-30S18BTC 768 49 39.125 12.812 22.75 3.28 3.50 3 1.50 2.06
J-30S18RTA 404 49 39.125 8.562 22.75 3.28 3.50 3 1.50 2.06
J-30S18RTB 630 49 39.125 11.062 22.75 3.28 3.50 3 1.50 2.06
J-30S18RTC 768 49 39.125 12.812 22.75 3.28 3.50 3 1.50 2.06
J-35S18BTA 483 53.5 42.375 8.562 22.75 3.27 4.25 3.38 1.50 2.06
J-35S18BTB 709 53.5 42.375 11.062 22.75 3.27 4.25 3.38 1.50 2.06
J-35S18BTC 847 53.5 42.375 12.812 22.75 3.27 4.25 3.38 1.50 2.06
J-35S18RTA 483 53.5 42.375 8.562 22.75 3.27 4.25 3.38 1.50 2.06
J-35S18RTB 709 53.5 42.375 11.062 22.75 3.27 4.25 3.38 1.50 2.06
J-35S18RTC 847 53.5 42.375 12.812 22.75 3.27 4.25 3.38 1.50 2.06

*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