Yoke Forged Snatch Block with Shackle
Brand: Yoke
Quick Overview:
- Capacity: 12t & 15t
- Sheave diameter: 6" / 8" / 10"
- Bronze bushing and grease fitting
- ASME B30.26-2010
- Safety factor: 4:1
- Light and Super also available
Our Forged Snatch Blocks with Shackles from Yoke are high-performance and are capable of lifting up to 15t, safely - dependent on the variation chosen.
Available in 3 sheave diameters (see options via dropdown menu), they are particularly suited to applications in oilfields and offshore environments.
Featuring part number, wire rope size and WLL marked on each unit, they are fatigue rated to 20,000 cycles at 1.5x the working load limit, as well as designed with a safety factor of 4:1.
- Capacity: 12t & 15t
- Sheave diameter: 6" / 8" / 10"
- Bronze bushing and grease fitting
- ASME B30.26-2010
- Safety factor: 4:1
- Light and Super also available
DIMENSIONAL SPECIFICATIONS
| Part Code |
WLL |
Sheave Dia. |
Wire Rope |
a mm |
b mm |
e mm |
f mm |
g mm |
k mm |
l mm |
r mm |
Mass |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
8-501-02 |
2.0 |
76 |
8-10 | 35 | 30 | 64 | 11 | 75 | 150 | 228 | 217 | 3.8 |
|
8-501-04 |
4.0 |
114 |
10-13 | 64 | 50 | 79 | 19 | 107 | 243 | 356 |
336 |
6.2 |
|
8-501-08 |
8.0 |
152 |
16-19 | 87 | 76 | 104 | 32 | 152 | 320 | 484 | 452 |
13.2 |
|
8-501-0808 |
8.0 |
203 |
16-19 | 87 | 76 | 104 | 32 | 220 | 333 | 558 | 526 |
18.2 |
|
8-541-12 |
12.0 |
152 |
19-22 | 78 | 80 | 134 | 44 | 167 | 359 | 540 | 496 |
24.8 |
|
8-541-15 |
15.0 |
203 |
19-22 | 78 | 80 | 134 | 44 | 220 | 355 | 589 | 545 |
29.6 |
|
8-541-1510 |
15.0 |
254 |
19-22 | 78 | 80 | 134 | 44 | 280 | 423 | 714 | 670 |
42.7 |
|
8-501-1512 |
15.0 |
305 |
19-22 | 78 | 80 | 134 | 44 | 330 | 428 | 770 | 726 |
52.8 |
|
8-551-20 |
20.0 |
203 |
25-29 | 109 | 93 | 150 | 55 | 216 | 433 | 671 | 616 |
41.6 |
|
8-551-2010 |
20.0 |
254 |
25-29 | 109 | 93 | 150 | 55 | 280 | 481 | 778 | 723 |
52.4 |
|
8-551-2012-29 |
20.0 |
305 |
25-29 | 109 | 93 | 150 | 55 | 330 | 485 | 883 | 778 |
62.8 |
| Part Code |
WLL |
Sheave Dia. |
Wire Rope |
a inch |
b inch |
e inch |
f inch |
g inch |
k inch |
l inch |
r inch |
Mass |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
8-501-02 |
2 | 3 | 5/16 - 3/8 | 1.38 | 1.18 | 2.52 | 0.43 | 2.95 | 5.91 | 8.96 | 8.53 | 4.4 |
|
8-501-04 |
4 | 4-1/2 | 3/8 - 1/2 | 2.52 | 1.97 | 3.11 | 0.75 | 4.21 | 9.57 | 14.02 | 13.27 | 13.0 |
|
8-501-08 |
8 | 6 | 5/8 - 3/4 | 3.43 | 2.99 | 4.09 | 1.26 | 5.98 | 12.60 | 19.06 | 17.80 | 28.7 |
|
8-501-0808 |
8 | 8 | 5/8 - 3/4 | 3.43 | 2.99 | 4.09 | 1.26 | 8.66 | 13.10 | 21.90 | 20.64 | 43.0 |
|
8-541-12 |
12 | 6 | 3/4 - 7/8 | 3.07 | 3.15 | 5.28 | 1.73 | 6.57 | 14.13 | 21.26 | 19.63 | 53.6 |
|
8-541-15 |
15 | 8 | 3/4 - 7/8 | 3.07 | 3.15 | 5.28 | 1.73 | 8.66 | 13.99 | 23.19 | 21.46 | 65.1 |
|
8-541-1510 |
15 | 10 | 3/4 - 7/8 | 3.07 | 3.15 | 5.28 | 1.73 | 11.00 | 16.70 | 28.10 | 26.37 | 94.8 |
|
8-501-1512 |
15 | 12 | 3/4 - 7/8 | 3.07 | 3.15 | 5.28 | 1.73 | 13.00 | 16.80 | 30.30 | 28.57 | 117.9 |
|
8-551-20 |
20 | 8 | 1 - 1-1/8 | 4.29 | 3.66 | 5.91 | 2.17 | 8.50 | 17.05 | 26.42 | 24.25 | 90.8 |
|
8-551-2010 |
20 | 10 | 1 - 1-1/8 | 4.29 | 3.66 | 5.91 | 2.17 | 11.00 | 18.90 | 30.60 | 28.46 | 119.0 |
|
8-551-2012-29 |
20 | 12 | 1 - 1-1/8 | 4.29 | 3.66 | 5.91 | 2.17 | 13.00 | 19.10 | 32.80 | 30.63 | 137.8 |
LOADS ON BLOCKS
Angle Factor Mutipliers
The Working Load Limit (WLL) for Yoke Group blocks indicates the maximum load that should be exerted on the block and its connecting fitting. This total load value may be different from the weight being lifted or pulled by a hoisting system. It is necessary to determine the total load being imposed on each block in the system to properly determine the rated capacity block to be used. A single sheave block used to change load line direction can be subjected to total loads greatly different from the weight being lifted or pulled. The total load value varies with the angle between the incoming and departing lines to the block. The following chart indicates the factor to be multiplied by the line pull to obtain the total load on the block.
| Angle | Factor | Angle | Factor |
| 0 | 2.00 | 100 | 1.29 |
| 10 | 1.99 | 110 | 1.15 |
| 20 | 1.97 | 120 | 1.00 |
| 30 | 1.93 | 130 | 0.84 |
| 40 | 1.87 | 135 | 0.76 |
| 45 | 1.84 | 140 | 0.68 |
| 50 | 1.81 | 150 | 0.52 |
| 60 | 1.73 | 160 | 0.35 |
| 70 | 1.64 | 170 | 0.17 |
| 80 | 1.53 | 180 | 0.00 |
| 90 | 1.41 | - | - |
SHEAVE SIZE AND WIRE ROPE STRENGTH
| Ratio A |
Strength Efficiency Compared |
Ratio A |
Strength Efficiency Compared |
| 40 | 95 | 8 | 83 |
| 30 | 93 | 6 | 79 |
| 20 | 91 | 4 | 75 |
| 15 | 89 | 2 | 65 |
| 10 | 86 | 1 | 50 |
Ratio A = Sheave Diameter ÷ Rope Diameter
Strength Efficiency
Bending wire rope reduces its strength. To account for the effect of bend radius on wire rope strength when selecting a sheave, use the table above.
| Ratio B |
Relative Fatigue |
Ratio B |
Relative Fatigue |
| 30 | 10.0 | 16 | 2.1 |
| 25 | 6.6 | 14 | 1.5 |
| 20 | 3.8 | 12 | 1.1 |
| 18 | 2.9 | - | - |
