ASC
150# Stainless Steel Square Head Plug
- SKU:
- S3114SP & S3116SP
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
150# Stainless Steel Square Head Plug
SCI Heavy Pattern 150# Stainless Steel Square Head Plugs provide a durable threaded closure for compatible female NPT openings in stainless steel piping systems, fittings, valves, manifolds, and equipment connections.
Manufactured from cast stainless steel, these heavy-pattern plugs are available in 304 stainless steel and 316 stainless steel configurations. The male NPT connection threads into a compatible female NPT opening, while the external square head provides accessible wrenching surfaces for installation and removal.
Product Highlights
- Heavy Pattern 150# stainless steel square head plug
- Designed to close compatible female-threaded openings
- Male NPT threaded connection
- External square head for wrench engagement
- NPT threads conform to ASME B1.20.1
- Cast stainless steel construction
- 304 stainless steel / ASTM A351 CF8 configuration
- 316 stainless steel / ASTM A351 CF8M configuration
- SCI Figure S3114SP for 304 stainless steel
- SCI Figure S3116SP for 316 stainless steel
- Heavy Pattern 150# threaded fitting construction
Technical Specifications
| Product Type | Square Head Plug |
|---|---|
| Pressure Class | 150# |
| Pattern | Heavy Pattern |
| Construction | Cast Stainless Steel |
| Connection Type | Male NPT |
| Head Style | Square Head |
| Thread Standard | ASME B1.20.1 |
| 304 Stainless Figure | S3114SP |
| 316 Stainless Figure | S3116SP |
| 304 Stainless Material | ASTM A351 ACI Grade CF8 |
| 316 Stainless Material | ASTM A351 ACI Grade CF8M |
| Function | Female NPT Opening Closure |
Construction Details
SCI Heavy Pattern 150# Square Head Plugs are manufactured from cast stainless steel. SCI specifies ASTM A351 ACI Grade CF8 for its 304 stainless steel castings and ASTM A351 ACI Grade CF8M for its 316 stainless steel castings.
The plug incorporates a male NPT threaded connection for installation into a compatible female-threaded opening. SCI specifies NPT threads conforming to ASME B1.20.1.
An external square head provides defined wrenching surfaces for installing or removing the plug when system access, maintenance, or piping modifications are required.
Square Head Design
External Wrenching Surface
The raised square head provides accessible flat surfaces for tool engagement during installation and removal.
Threaded Opening Closure
The solid plug body closes a compatible female NPT opening where the piping connection is not being continued to another component.
304 & 316 Stainless Steel Options
304 Stainless Steel
SCI Figure S3114SP identifies the 304 stainless steel square head plug. SCI specifies ASTM A351 ACI Grade CF8 for its 304 stainless steel castings.
316 Stainless Steel
SCI Figure S3116SP identifies the 316 stainless steel square head plug. SCI specifies ASTM A351 ACI Grade CF8M for its 316 stainless steel castings.
Male NPT Connection
The plug uses a male NPT threaded connection designed to mate with a compatible female NPT opening of the same nominal size.
SCI specifies NPT threads conforming to ASME B1.20.1. Confirm the nominal connection size and mating female thread before ordering.
Square Head vs. Hex Head Plug
Square Head Plug
The square head configuration provides four external wrenching faces above the threaded portion of the plug. SCI identifies this configuration as Figures S3114SP and S3116SP.
Hex Head Plug
SCI also documents a separate hex head plug configuration. Select the head style that best matches the installation, service-access, and tooling requirements of the piping system.
Heavy Pattern 150# Construction
This square head plug is part of SCI's Heavy Pattern 150# Threaded Fittings - Cast family.
The SCI catalog provides manufacturer part numbers, dimensional values, packing quantities, and published weights for each documented square head plug size.
Typical Applications
Industrial & Process Piping
- Industrial process piping
- Equipment connection closures
- Utility piping systems
- Manifold openings
- Maintenance and access ports
Commercial & Stainless Systems
- Stainless steel piping systems
- Commercial mechanical piping
- General fluid-handling systems
- Unused threaded fitting openings
- Compatible female NPT connections
Installation & Selection Considerations
- Confirm the required nominal size and male NPT connection before ordering.
- Select the appropriate 304 or 316 stainless steel configuration for the intended piping system and process media.
- Verify fitting material compatibility with the operating conditions and connected piping components.
- Use the square head as the wrenching surface and follow appropriate thread-sealing practices for the application.
- Fully isolate and depressurize the piping system before installing, removing, or servicing the plug.
Use the SCI Heavy Pattern 150# Stainless Fittings catalog to confirm square head plug construction, 304 and 316 stainless steel options, part numbers, dimensions, published weights, and NPT thread specifications. The GetPipe.com Common Diameters & Wall Thicknesses chart can also help with related pipe sizing information.
SCI Heavy Pattern 150# Stainless Fittings PDF Pipe Chart Diameters & Wall Thicknesses PDFNeed Help Selecting a 150# Stainless Steel Square Head Plug?
Our fitting and industrial product specialists can help review your required plug size, male NPT connection, 304 or 316 stainless steel requirements, piping compatibility, and application before you order.
Frequently Asked Questions
What is a square head plug used for?
A square head plug is used to close a compatible female NPT threaded opening in a fitting, valve, manifold, equipment connection, or piping component.
What type of connection does this plug use?
The plug uses a male NPT threaded connection.
What thread standard does SCI specify?
SCI specifies NPT threads conforming to ASME B1.20.1.
Why does the plug have a square head?
The external square head provides accessible wrenching surfaces for installation and removal.
What is the 304 stainless steel figure number?
SCI Figure S3114SP identifies the 304 stainless steel square head plug.
What is the 316 stainless steel figure number?
SCI Figure S3116SP identifies the 316 stainless steel square head plug.
What casting grade is used for 304 stainless steel?
SCI identifies its 304 stainless steel castings as ASTM A351 ACI Grade CF8.
What casting grade is used for 316 stainless steel?
SCI identifies its 316 stainless steel castings as ASTM A351 ACI Grade CF8M.
What sizes are documented?
The supplied SCI catalog documents the square head plug family from 1/8" through 4".
What should I verify before ordering?
Confirm the nominal plug size, male NPT connection, required stainless steel grade, mating female thread, and intended service conditions before ordering.
Important Ordering & Installation Notes
- This listing is for an SCI Heavy Pattern 150# Stainless Steel Square Head Plug.
- SCI identifies Figure S3114SP for 304 stainless steel and Figure S3116SP for 316 stainless steel.
- Confirm the required nominal size and male NPT connection before ordering.
- Verify the selected stainless steel material is compatible with the intended process media and operating conditions.
- Review the supplied SCI Heavy Pattern 150# catalog and Common Diameters & Wall Thicknesses chart for manufacturer specifications and related pipe-sizing information.
