15mm-250mm screw diameter
300mm-8000mm screw length
40mm-400mm barrel outer diameter
L/D��10-46
screw:
1. normal nitriding screw (SACM645)
2. top gear spray-welding bimetallic screw
3. wlfram steel screw
4. hard scries screw:NPT1,NPT2,NOT3
5. ceramic and diamond on surface screw
barrel
1. normal nitriding barrel (SACM645)
2. centrifugal casting bimetallic barrel(A��B��C , three grades)
3. hard series barrel��NPT1��NPT2NPT3��
HV��290 surface hardness
HV850-1000 nitriding hardness
0.45-0.7mm nitriding depth
��one degree nitriding brittleness
0.015mm screw strightness
��900HV chrome hardness
0.05-0.1mm chrome thickness
60-70HRC bimetallic hardness
0.8-2.0mm bimetallic depth