18 inch

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