Design Features：
The housing assembly is made of thick section steel plate to provide enough weight.
The wire line is kept taut when hoisting or lowering the unloaded block.
The sheave grooves are hardened by medium frequency induction to provide extended service life.
Equipped with double-row conical roller bearings and each bearing is individually lubricated.
The sheaves and bearings are interchangeable with those of corresponding crown blocks.
The traveling blocks conform to API specification 8C and API monogram can be used.
Parameter:
| Model | YC90 | YC135 | YC170 | YC225 | YC315 | YC450 | YC585 |
| Max Hook Load KN | 900 | 1350 | 1700 | 2250 | 3150 | 4500 | 5850 |
| OD Of Sheave mm(in) |
762 (30) |
915 (36) |
915 (36) |
1120 (44) |
1270 (50) |
1524 (60) |
1524 (60) |
| Number of Sheave | 4 | 4 | 5 | 5 | 6 | 6 | 7 |
| Dia of Wire Line mm(in) |
26 (1) |
26 (1) |
29 (1 1/8) |
32 (1 1/4) |
35 (1 3/8) |
38 (1 1/2) |
42 (1 5/8) |
| Size (L×W×H)mm | 1500×806 ×533 |
1800×960 ×610 |
2100×960 ×630 |
2294×1190 ×630 |
2680×1350 ×974 |
3075×1600 ×800 |
3100×1600 ×965 |
| Weight kg | 1810 | 2200 | 3010 | 3805 | 6842 | 8135 | 9600 |
Design Features：
Equipped with a hydraulic snubber assembly to protect tool joints when making up/breaking out connections.
Equipped with the reliable safety devices on the hook.
The high stress parts of every hook are subjected to nondestructive testing.
The hook conform to API specification 8C and API monogram can be used.
Parameter:
| Model | DG90 | DG135 | DG170 | DG225 | DG315 | DG450 | DG585 |
| Max Hook Load kN | 900 | 1350 | 1700 | 2250 | 3150 | 4500 | 5850 |
| Size of Master month of Hook mm(in) |
155(6 1/16) | 165 (6 1/2) |
180 (7) |
190 (7 1/2) |
220 (8 5/8) |
220 (8 5/8) |
238 (9 3/8) |
| OD of Master month of Hook mm(in) | 116 (4 1/2) |
140 (5 1/2) |
150 (6) |
160 (6 1/4) |
180 (7) |
180 (7) |
180 (7) |
| OD of Accessary month of Hook mm(in) | 80 (3 1/8) |
90 (3 1/2) |
90 (3 1/2) |
100 (4) |
120 (4 3/4) |
120 (4 3/4) |
120 (4 3/4) |
| Size (L×W×H)mm | 2000×680 ×600 |
2200×720 ×616 |
2450×750 ×630 |
2545×780 ×750 |
2953×890 ×830 |
2950×890 ×880 |
3156×930 ×930 |
| Weight kg | 1800 | 1910 | 2020 | 2180 | 3410 | 3496 | 3900 |