10 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- ness		Throat Opening	Hook	Hook	Deadend	Hole
		Length	Length		Width	w/Latch	Thick.	Width	Thick.	Dia.
J-3S10BTA	115	28.375	22.250	6.187	14	1.12	1.48	1.12	1.12	1.40
J-3S10BTB	185	28.375	22.250	8.375	14	1.12	1.48	1.12	1.12	1.40
J-3S10RTA	115	28.375	22.250	6.187	14	1.12	1.48	1.12	1.12	1.40
J-3S10RTB	185	28.375	22.250	8.375	14	1.12	1.48	1.12	1.12	1.40
J-5S10BTA	120	29.625	23.125	6.187	14	1.39	1.81	1.38	1.12	1.40
J-5S10BTB	190	29.625	23.125	8.375	14	1.39	1.81	1.38	1.12	1.40
J-5S10RTA	120	29.625	23.125	6.187	14	1.39	1.81	1.38	1.12	1.40
J-5S10RTB	190	29.625	23.125	8.375	14	1.39	1.81	1.38	1.12	1.40
J-10S10BTA	130	31.750	24.500	6.187	14	1.91	2.53	1.93	1.12	1.40
J-10S10BTB	200	31.750	24.500	8.375	14	1.91	2.53	1.93	1.12	1.40
J-10S10RTA	130	31.750	24.500	6.187	14	1.91	2.53	1.93	1.12	1.40
J-10S10RTB	200	31.750	24.500	8.375	14	1.91	2.53	1.93	1.12	1.40
J-15S10BTA	130	31.750	24.500	6.437	14	1.91	2.53	1.93	1.37	1.65
J-15S10BTB	200	31.750	24.500	8.375	14	1.91	2.53	1.93	1.37	1.65
J-15S10RTA	130	31.750	24.500	6.437	14	1.91	2.53	1.93	1.37	1.65
J-15S10RTB	200	31.750	24.500	8.375	14	1.91	2.53	1.93	1.37	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