 |
| ALTERNATE DESIGN OF FIBER BLOCKS |
|
- Sheaves Iron casting with smooth grooves, plain bore.
- Pins Cottered to prevent rotation or accidental removal.
- Bushes (When specified) sintered bronze oil retaining.
- Much stronger than wood blocks of equivalent size.
- Fitted with hook or eyes as required.
|
| Size of block in |
Length of shell in |
Sheave in |
Rope circumference in |
Single |
Double |
Treble |
| Swivel Eye |
Swivel Hook |
Swivel Eye |
Swivel Hook |
Swivel Eye |
Swivel Hook |
| Safe Working Load in cwt. |
| 3 |
3 1/2 |
1 3/4 X 5/8 |
1 1/2 |
4 |
2 12 |
8 |
5 |
10 |
5 |
| 4 |
4 3/4 |
2 1/2 x 3/4 |
2 |
7 1/2 |
3 3/4 |
17 |
10 |
20 |
10 |
| 5 |
53/4 |
3 1/4 x 7/8 |
21/4 |
10 |
5 |
22 |
15 |
30 |
15 |
| 6 |
7 |
3 3/4 x 1 1/4 |
3 |
20 |
10 |
40 |
22 |
40 |
25 |
| 7 |
8 |
4 1/2 x 1 1/4 |
3 1/4 |
22 |
12 |
45 |
25 |
48 |
30 |
| 8 |
91/4 |
5 1/2 x 1 3/8 |
3 1/2 |
2 2 1/2 |
121/2 |
52 |
30 |
60 |
40 |
|
|
| Natural Fiber Ropes |
| ference |
Diameter |
Approx. Coil Weight |
Minimum breaking loads for Manila Sisal Ropes Grade 2 |
| 120 fm. |
220 m. |
LBS |
kgs |
| 1 1/2 |
12 |
51 |
23 |
2100 |
950 |
| 1 3/4 |
14 |
68 |
31 |
2830 |
1280 |
| |
|
|
|
Tons |
kgs |
| 2 |
16 |
93 |
42 |
1.75 |
1780 |
| 2 1/4 |
18 |
109 |
49 |
2.1 |
2130 |
| 2 1/2 |
20 |
135 |
61 |
2.8 |
2840 |
| 2 3/4 |
22 |
160 |
73 |
3.35 |
3400 |
| 3 |
24 |
194 |
88 |
4.0 |
4060 |
| 3 1/4 |
26 |
228 |
103 |
4.65 |
4720 |
| 3 1/2 |
28 |
261 |
118 |
5.25 |
5330 |
| 3 3/4 |
30 |
304 |
138 |
6.0 |
6100 |
| 4" |
32 |
341 |
155 |
6.75 |
6860 |
| 4 1/2" |
36 |
435 |
197 |
8.5 |
8640 |
|
