The bolts always work together with a nut. A nut fastener is a mechanical fastener with a threaded hole. It is attached to a bolt, screw or stud to provide a clamping force and prevent axial movement. For example, a bolt is inserted through two parts, with aligned holes, and a nut is then screwed onto the bolt. The shaft of the bolt prevents radial movement of the parts, while the head of the bolt and the nut together prevent axial movement.
http://www.yuchaobolt.com/nut-fastener/

Another indispensible equipment is steel pipe printing marking machine. Companies that produce metal pipes, regardless of whether they are involved in construction, aerospace, electronics, etc., code these materials to enable traceability, display important production data, and prevent counterfeiting. These codes generally take the form of numeric lot numbers or machine-scannable bar codes.
http://www.westwu-machine.com/....automatic-marking-ma

A ball valve functions as a quarter-turn valve, which controls flow through a hollow, perforated, and pivoting sphere, hence the name. It is in the same valve family as butterfly valves and plug valves, which are also quarter-turn valves. The sphere has a port, or a bore, in its center, which is critical to its function. When the bore in the ball valve function is lined up with the associated pipeline, the valve is open, so fluid can move through the bore.
http://www.tfcvalve.com/ball-v....alve/trunnion-mounte

On a blank sheet of watercolor paper, doodle or draw your resist design using the glue pen. This glue pen has a clear glue for ink and the design you draw won’t be easily visible unless you tilt your paper to the light. Let this glue design dry for a few minutes, it shouldn’t take longer than 5 minutes.
http://www.subbuteo.com.cn/mai....n-products/lithium-b

These physical properties of the API are often controlled in the final API crystallization step. Because most small molecule drugs (.90%) are delivered in crystalline form, and currently about 90% of new API's being pursued are classified as having low solubility in water, a well-controlled crystallization of the API is often a vitally important operation in pharmaceutical manufacturing.
http://www.purestchem.com/pest....icides-and-pesticide