16 inch

Key to three sheave J-Block Model Numbers

J

10

T

10

B

T

A

Shorty “J” Crane Block

Safe Working Limit-Tons

Number of Sheaves

T=3
Triple

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
J25T16BTA	389	33.75	30.75	8.875	20.125	2.80	3.00	2.38
J25T16BTB	544	33.75	30.75	12.375	20.125	2.80	3.00	2.38
J25T16BTC	690	33.75	30.75	14.875	20.125	2.80	3.00	2.38
J25T16RTA	389	33.75	30.75	8.875	20.125	2.80	3.00	2.38
J25T16RTB	544	33.75	30.75	12.375	20.125	2.80	3.00	2.38
J25T16RTC	690	33.75	30.75	14.875	20.125	2.80	3.00	2.38
J30T16BTA	437	40	36.25	8.875	20.125	3.28	3.50	3.00
J30T16BTB	593	40	36.25	12.375	20.125	3.28	3.50	3.00
J30T16BTC	739	40	36.25	14.875	20.125	3.28	3.50	3.00
J30T16RTA	437	40	36.25	8.875	20.125	3.28	3.50	3.00
J30T16RTB	593	40	36.25	12.375	20.125	3.28	3.50	3.00
J30T16RTC	739	40	36.25	14.875	20.125	3.28	3.50	3.00
J35T16BTA	494	43.75	39.50	8.875	20.125	3.27	4.25	3.38
J35T16BTB	650	43.75	39.50	12.375	20.125	3.27	4.25	3.38
J35T16BTC	796	43.75	39.50	14.875	20.125	3.27	4.25	3.38
J35T16RTA	494	43.75	39.50	8.875	20.125	3.27	4.25	3.38
J35T16RTB	650	43.75	39.50	12.375	20.125	3.27	4.25	3.38
J35T16RTC	796	43.75	39.50	14.875	20.125	3.27	4.25	3.38
J40T16BTA	505	45.25	41	9	20.125	3.27	4.25	3.38
J40T16BTB	661	45.25	41	12.375	20.125	3.27	4.25	3.38
J40T16BTC	807	45.25	41	14.875	20.125	3.27	4.25	3.38
J40T16RTA	505	45.25	41	9	20.125	3.27	4.25	3.38
J40T16RTB	661	45.25	41	12.375	20.125	3.27	4.25	3.38
J40T16RTC	807	45.25	41	14.875	20.125	3.27	4.25	3.38
J45T16BTA	505	45.25	41	9	20.125	3.27	4.25	3.38
J45T16BTB	661	45.25	41	12.375	20.125	3.27	4.25	3.38
J45T16BTC	807	45.25	41	14.875	20.125	3.27	4.25	3.38
J45T16RTA	505	45.25	41	9	20.125	3.27	4.25	3.38
J45T16RTB	661	45.25	41	12.375	20.125	3.27	4.25	3.38
J45T16RTC	807	45.25	41	14.875	20.125	3.27	4.25	3.38

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