Stainless Steel Square Head Plugs | Stainless Steel Threaded Pipe Plugs
High Quality Stainless Steel Plugs, NPT Plugs BSP Stainless Steel Plugs 316 Stainless Steel Plugs form India!
High Quality Stainless Steel Plugs, NPT Plugs BSP Stainless Steel Plugs 316 Stainless Steel Plugs form India!We are one of the leading manufacturers and exporters of Stainless Steel Square Head Plugs and Threaded Pipe Plugs from India. We have been supplying precision threaded pipe closure solutions to the world market for many decades. Designed to withstand pressure, temperature, and corrosion challenges in demanding environments, our plugs are available in multiple threading standards and production variants. With a global reputation for quality and consistency, our factory delivers bulk and customized solutions to OEMs, plumbing system integrators, petrochemical companies, and distributors worldwide. Our strength lies in producing high-integrity parts using a combination of investment casting, CNC turning, and hot forging, supported by full in-house testing and export-ready logistics.
Overview
Our Stainless Steel pipe plugs, NPT plugs, BSP plugs, Stainless Steel 316 Plugs, Stainless Steel threaded pipe plugs are used to securely seal off the ends of pipe systems or outlets in valves and equipment. The most popular style is the square head plug, allowing easy installation or removal using a wrench. These are commonly manufactured via investment casting, hot stamping, or CNC turning from solid bar depending on the size, volume, and strength requirements. Threading standards include NPT, BSP, BSPT, and NPSM, conforming to major international piping norms.
Material Grades and Properties
We offer plugs in the following Stainless Steel grades:
| Grade | Standard Equivalent | Properties |
|---|---|---|
| SS 304 | ASTM A351 CF8, JIS SUS304 | General corrosion resistance, good weldability |
| SS 316 | ASTM A351 CF8M, JIS SUS316 | Superior resistance to chlorides and acidic environments |
| SS 304L | ASTM A351 CF3 | Low carbon for better corrosion resistance post-welding |
| SS 316L | ASTM A351 CF3M | Low carbon, ideal for food and pharmaceutical applications |
Mechanical Properties of SS 316 (Typical)
| Property | Value |
| Tensile Strength | 515 – 620 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness (Max) | 95 HRB |
| Operating Temperature | Up to 870°C |
Manufacturing Processes
Our threaded pipe plugs are produced via:
- Investment Casting (Lost Wax Process) for mid-sized and intricate plugs
- Hot Stamping for high-strength heavy-duty plugs
- Turning from Solid Round Bar for small batch precision plugs
- Post-processing includes CNC threading, surface polishing, and pressure testing
Machinery Used
- CNC Lathes and Machining Centers
- Vertical Milling Machines for head shaping
- Thread Gauging Instruments (NPT, BSP, BSPT standards)
- Spectrometers and Surface Roughness Testers
- Leak Test Stations and Profile Projectors
Typical Parts Produced
- Square Head Plugs (NPT / BSPT / BSP / NPSM)
- Hex Head Plugs
- Flush Plugs
- Solid Bar Turned Threaded Plugs
Finish Options
- Shot Blasted Natural Finish
- Electro-polished for cleanroom or sanitary applications
- Machined Finish with protective threading caps
Industries Served
Our Stainless Steel pipe plugs are widely used in:
- Petrochemical & Oil Refining Units
- Water Treatment Systems
- Hydraulic and Pneumatic Circuits
- Food & Beverage Processing Equipment
- Marine and Offshore Installations
- HVAC and Fire Sprinkler Networks
Dimensional Chart (Standard Sizes)
| Nominal Pipe Size R | A (Thread Length) L | B (Across Flats) | Thread Standards |
| 1/4″ | 11 mm | 14 mm | NPT, BSP, BSPT, NPSM |
| 3/8″ | 12 mm | 17 mm | NPT, BSP, BSPT |
| 1/2″ | 14 mm | 22 mm | NPT, BSP, BSPT, NPSM |
| 3/4″ | 16 mm | 28 mm | NPT, BSP, BSPT |
| 1″ | 18 mm | 35 mm | NPT, BSP, BSPT |
| 1-1/4″ | 20 mm | 44 mm | NPT, BSPT |
| 1-1/2″ | 22 mm | 50 mm | NPT, BSPT |
| 2″ | 25 mm | 64 mm | NPT, BSPT |
Tolerances and Testing
- Dimensional Tolerance: ±0.2 mm
- Threading Accuracy: Class 2B (per ASME B1.20.1 for NPT)
- Surface Finish: ≤ 3.2 Ra (machined)
- Hydrostatic Testing: 1.5x rated pressure
Turnaround Time
We offer a standard 4 to 6-week lead time from order confirmation, with express manufacturing and global air freight available for urgent demands. All parts are inspected before dispatch and supported by detailed test documentation.
Why Choose Us
Our 30+ years of export experience, combined with advanced manufacturing technology and client-centric service, ensure reliability. We offer:
- Flexible production schedules
- Custom branding and packaging
- Quick response and engineering support
- Quality consistency with competitive pricing
- ISO-compliant systems and export certification
Frequently Asked Questions
- Do you provide metric and imperial sizes?
- Yes, we offer both metric and inch-based pipe thread plugs.
- Can you supply plugs with food-grade finish?
- Yes, electro-polished plugs are available for sanitary and cleanroom use.
- Do you offer third-party inspection?
- Yes, with agencies like SGS, BV, TUV on customer request.
- What are your MOQ terms?
- Flexible MOQ for repeat buyers and export partners.
- Can you mark plugs with logos or codes?
- Yes, laser or emboss marking is available on bulk orders.
- Do you support custom threads?
- Absolutely. We manufacture NPT, BSPT, BSP, NPSM and special threads.
- Are the threads dryseal?
- We can produce NPTF (dryseal) on request.
- What quality certificates do you provide?
- Material test certificate, pressure test report, RoHS and REACH compliance.
- Are plugs pressure tested?
- Yes, we perform hydrostatic testing on all batches.
- Do you have export experience?
- Yes, we export to North America, EU, Gulf, and SE Asia regularly.
Customer Testimonial
“We’ve ordered Stainless Steel square head plugs for multiple valve assemblies. Their quality and consistency match our ASME requirements, and their team has always delivered well-packed, documentation-ready exports on time.” — Tom L., Ohio, USA
Glossary of Terms
- Square Head Plug: A plug with a square protrusion for wrench tightening
- NPT/BSPT: Tapered pipe thread standards used in sealing connections
- Investment Casting: Precision casting process using wax molds
- Hot Stamping: Forging process using heated dies to shape metal
- Thread Gauging: Measurement of thread conformity using calibrated gauges
Packaging and Shipping
- Moisture-resistant polybags or caps on threads
- Corrugated export cartons with dividers
- Wooden crates for bulk or sea freight
- Custom labels with part numbers, barcodes, and logos available
Related parts we offer:
SS square head pipe plugs
Stainless Steel threaded square plugs
304 stainless square head plug
316 stainless square head pipe plug
BSP threaded square head plugs
NPT Stainless Steel square plugs
Square head screw pipe plug SS
Industrial SS square plugs
Stainless Steel pipe end plug square head
High pressure stainless square head plug
Metric stainless square pipe plugs
SS threaded pipe plug
BSPT stainless pipe plug
Stainless threaded end cap
Stainless Steel pipe plug NPT
316 stainless threaded plug supplier
304 SS plug fitting BSP
NPT male threaded stainless plug
Sanitary threaded pipe plug stainless
Industrial threaded pipe plug
Stainless barstock plug
Custom stainless plug with thread
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