Bimetallic thermometer straight thread and taper thread distinction

Thread in real life there are all kinds of, such as female, male, common thread, pipe thread, straight thread, taper thread and so on. But in the bimetallic thermometer is commonly used in straight thread and taper thread. We introduce what is the difference between: 1. Role distinction: according to the use straight screw thread is commonly used in fasteners, taper thread is commonly used in pipeline connection and need to seal the occasion. 2. Production process is different: taper thread connector: through the end of special steel taper thread joint and fittings taper thread occlusion. Taper thread thread head is completely prepared ahead of time, field connections takes short time limit, the only need to use torque wrench operation, does not need to move equipment and pull wire, but the taper thread joint quality is not stable. As a result of the processing thread taper thread path weaken the cross-sectional area of parent metal, which reduces the joint strength, normally only reach the parent metal the tensile strength of 85 ~ 95%. Straight thread connection joint: mainly upsetting straight thread connection joint and rolling straight thread connection joint. With these two kinds of different processing methods, enhance the bearing capacity of reinforced end thread, achieve the goal of joint with the reinforced material such as strong. 1. Upsetting straight thread connection joint: after reinforced end upsetting straight screw thread occlusion and fittings made of formation of the joint. 2. Joint: rolling straight thread connection by reinforced end direct rolling or squeeze ( Grinding) Rib rolling pressure or after stripping rib rolling straight thread and fittings produced by the bite of connectors. Additional bimetallic thermometer when straight thread and fastener tighten, with a flat washer, taper thread and teflon tape should be used when fastener tighten.