Type | XJ-65 | XJ-115B | XJ-120 | XJ-150 | XJ-200 | XJ-250 |
Forms of screw and screw thread | Double-head equal-depth convergent type | Double-head convergent type | Double-head convergent type | Double-head unequal-depth | Double-head convergent type | Double-head convergent type |
(mm)Screw diameter | 65 | 115 | 120 | 150 | 200 | 250 |
( LD) Length-diameter ratio of screw | 4 | 4.8 | 4.6 | 4.43 | 4.35 | 4.5 |
Compression ratio | 1.3 | 4.6 | 1.34 |
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