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14 inch

Double-Sheave-J-Block

Key to two sheave J-Block Model Numbers

J 5 D 10 B T A
Shorty “J” Crane Block Safe Working Limit-Tons

Number of Sheaves

Double

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
J-10D14BTA 200 31.125 28.500 6.125 18 1.91 2.53 1.93
J-10D14BTAB 300 31.125 28.500 7.562 18 1.91 2.53 1.93
J-10D14BTB 380 31.125 28.500 10.562 18 1.91 2.53 1.93
J-10D14BTC 540 31.125 28.500 14.812 18 1.91

2.53

 1.93
J-10D14RTA 200 31.125 28.500 6.125 18 1.91 2.53 1.93
J-10D14RTAB 300 31.125 28.500 7.562 18 1.91 2.53 1.93
J-10D14RTB 380 31.125 28.500 10.562 18 1.91 2.53 1.93
J-10D14RTC 540 31.125 28.500 14.812 18 1.91 2.53 1.93
J-15D14BTA 200 31.125 28.500 6.125 18 1.91 2.53 1.93
J-15D14BTAB 300 31.125 28.500 7.562 18 1.91 2.53 1.93
J-15D14BTB 380 31.125 28.500 10.562 18 1.91 2.53 1.93
J-15D14BTC 540 31.125 28.500 14.812 18 1.91 2.53 1.93
J-15D14RTA 200 31.125 28.500 6.125 18 1.91 2.53 1.93
J-15D14RTAB 300 31.125 28.500 7.562 18 1.91 2.53 1.93
J-15D14RTB 380 31.125 28.500 10.562 18 1.91 2.53 1.93
J-15D14RTC 540 31.125 28.500 14.812 18 1.91 2.53 1.93
J-20D14BTA 278 36.500 32.750 6.625 18 2.80 3.00 2.38
J-20D14BTAB 378 36.500 32.750 8.062 18 2.80 3.00 2.38
J-20D14BTB 460 36.500 32.750 11.062 18 2.80 3.00 2.38
J-20D14BTC 625 36.500 32.750 15.312 18 2.80 3.00 2.38
J-20D14RTA 278 36.500 32.750 6.625 18 2.80 3.00 2.38
J-20D14RTAB 378 36.500 32.750 8.062 18 2.80 3.00 2.38
J-20D14RTB 460 36.500 32.750 11.062 18 2.80 3.00 2.38
J-20D14RTC 625 36.500 32.750 15.312 18 2.80 3.00 2.38
J-25D14BTA 278 36.500 32.750 6.625 18 2.80 3.00 2.38
J-25D14BTAB 378 36.500 32.750 8.062 18 2.80 3.00 2.38
J-25D14BTB 460 36.500 32.750 11.062 18 2.80 3.00 2.38
J-25D14BTC 625 36.500 32.750 15.312 18 2.80 3.00 2.38
J-25D14RTA 278 36.500 32.750 6.625 18 2.80 3.00 2.38
J-25D14RTAB 378 36.500 32.750 8.062 18 2.80 3.00 2.38
J-25D14RTB 460 36.500 32.750 11.062 18 2.80 3.00 2.38
J-25D14RTC 625 36.500 32.750 15.312 18 2.80 3.00 2.38
J-30D14BTA 280 38 32.250 6.625 18 3.28 3.50 3.00
J-30D14BTAB 380 38 32.250 8.062 18 3.28 3.50 3.00
J-30D14BTB 460 38 32.250 11.062 18 3.28 3.50 3.00
J-30D14BTC 625 38 32.250 15.312 18 3.28 3.50 3.00
J-30D14RTA 280 38 32.250 6.625 18 3.28 3.50 3.00
J-30D14RTAB 380 38 32.250 8.062 18 3.28 3.50 3.00
J-30D14RTB 460 38 32.250 11.062 18 3.28 3.50 3.00
J-30D14RTC 625 38 32.250 15.312 18 3.28 3.50 3.00


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