screw caps for injectoin machineinclude (screw caps,ring seat, ring valve),Accessories for screw According to the customer design ... for single screw and barrel as like screw caps,ring seat, ring valve ect.,TECHNICAL DATA Depth of nitration case:0 ... -proof, heatproof, high-pressure proof and high-speed proof)Suitable plastic material: PP,PE,ABS,AS,PS etc. Material: SACM-645 ...