The Stainless Steel Hex Plug 316 Class 300 Threaded NPT Casting Fitting is an essential component for sealing idle ports in various pipeline systems.

Class 300-pound threaded hexagonal pipe plugs are widely used in:

• Water treatment facilities
• Chemical auxiliary pipelines
• General industrial fluid handling
• Building water supply and drainage systems

The NPT threaded connection provides a simple, effective, and reversible sealing solution, suitable for terminal sealing of various medium and low-pressure pipelines.

Our cast pipe fittings are produced using precision casting (sol silica) technology to achieve excellent dimensional accuracy and surface finish:

1. Creation of wax mold
2. Coating with multiple layers of refractory material
3. Heating to melt wax and form hollow shell
4. Pouring molten stainless steel
5. Cooling and solidification
6. Machining and tapping to produce final product

• Product Name: Threaded Hex Plug
• Material: Stainless Steel 316 / Casting Grade CF8M
• Standard: ASTM A351 (Material) / ISO 4144 (Dimensions, ref.)
• Fitting Type: Hex Head Plug, Casting
• Connection: Threaded NPT
• Pressure Rating: Class 300
• Application: Sealing Threaded Ports, Low-Pressure Systems
• Size: Available in various sizes

Casting plugs are used to safely block unused internal threaded ports on pipe fittings or pipelines. The most common types include:

• Hexagonal Head Plug (Hex Plug): Most common design facilitating installation and removal using standard wrenches
• Square Head Plug: Alternative design for specific tool requirements
• Round Head Plug: For specific installation space requirements

Threaded pipe fittings primarily follow two major international thread systems:

• NPT (American Standard Pipe Taper Thread): 60° thread angle, 1:16 taper for sealing (used in this product)
• BSP (British Standard Pipe Thread): 55° thread angle, available as taper (BSPT) or parallel (BSPP)

The use of CF8M/316 stainless steel ensures excellent durability and corrosion resistance:

• Superior to 304 grade in resisting chloride and general industrial corrosion
• Contains molybdenum for enhanced corrosion resistance
• Prevents thread sticking or failure due to corrosion
• Ensures long-term sealing reliability
• Enables smooth disassembly during maintenance