Product Summary

• Material standard

  General structural carbon steel pipe (JIS G3444) or equivalent material is used.

• Screw standard

  This is an internal thread type pipe fitting (conforming to JIS B0203) that requires a parallel female thread [symbol: PS (Rp)] for taper male thread or a taper female thread [symbol: PT (Rc)]. Suitable for joining pipe nipples, other pipe material parts, fluid equipment, etc. with pipe male thread (PT) for pipes whose main purpose is tightness.

• About inspection of screw

  All thread inspections are performed using a taper thread gauge specified in the standard number (JIS B0253) defined by the Japanese Industrial Standards (JIS standard). In addition, our inspection gauge manufacturer uses OSG (OSG).

• Join method

  When tightening, after tightening by hand, it is necessary to tighten with torque using a tool such as a pipe wrench. However, in order to tightly bond, even if it is tightened tightly, there is a slight space between the top and bottom of the mountain in practical use, and perfect airtightness cannot be secured. Therefore, it is necessary to take measures such as wrapping seal tape (tape-like gap filling material) around the screw before assembly or applying the same liquid sealant. (It is necessary to select the type of sealing material suitable for the piping application.) Also, when assembling in a place where attention is paid to leakage, seal tape (about 2 to 3 turns) is wrapped around the external thread. Apply sealant from the top, and apply sealant on the female thread side to secure tightness.

• About Electroplating

  The chemical composition of electrogalvanized (UNIQLO) zinc plating is chromium sulfate (7.6%), which complies with the RoHS Directive (Rose Directive). The plating film thickness is 5 μ .

• Inspection pressure

  Leakage(pneumatic)	0.5Mpa(5.1kgf/cm2)
  Pressure resistance(water pressure)	2.5Mpa(25.5kgf/cm2)

• Type, symbol, chemical composition

  Type	Symbol	Chemical composition(%)
  		C	Si	Mn	P	S	Ni	Cr	Mo
  Carbon steel pipe for general structure	STK	0.25 or less	-	-	0.040 or less	0.040 or less	-	-	-