ASME B16.11 | Forged Threaded / Screwed Square Plugs | Class 2000–6000 | NPS 1/8–4
Elite provides high-quality Forged Threaded / Screwed Square Plugs for industrial piping, process systems, oil & gas, petrochemical, chemical processing, power generation and general engineering applications. Manufactured using controlled forging and precision machining processes, these plugs provide reliable dimensional accuracy, material integrity and durable service performance.
Threaded / Screwed Square Plugs are used to close and seal threaded openings in piping systems, fittings and equipment. The square head provides a practical tool-engagement surface for installation and removal. Elite can supply standard and project-specific configurations in carbon steel, stainless steel, alloy steel, duplex, super duplex, copper-nickel and nickel alloys.
| Standard Threaded Square Plugs | Specialty / Material Options |
|---|---|
| Forged Threaded Square Plug | Square Head Threaded Plug |
| ASME B16.11 Threaded Square Plug | Class 2000 Threaded Square Plug |
| Class 3000 Threaded Square Plug | Class 6000 Threaded Square Plug |
| Stainless Steel Threaded Square Plug | Carbon Steel Threaded Square Plug |
| Alloy Steel Threaded Square Plug | Duplex Steel Threaded Square Plug |
| Super Duplex Threaded Square Plug | Copper-Nickel Threaded Square Plug |
| Nickel Alloy Threaded Square Plug | Monel Threaded Square Plug |
| Inconel Threaded Square Plug | Hastelloy Threaded Square Plug |
| Titanium Threaded Square Plug | Custom Forged Threaded Square Plug |
| Specification | Details | |
|---|---|---|
| Product Type | Forged Threaded / Screwed Square Plug | |
| Design / Dimensions | ASME B16.11 | |
| Thread Standard | ASME B1.20.1 / Project Specified | |
| Additional Standards | BS 3799, where applicable | |
| Size Range | NPS 1/8" to 4" | |
| Pressure Classes | 2000, 3000 and 6000 | |
| Configuration | Square Head Plug | |
| End Connection | Male Threaded / Screwed | |
| Thread Type | NPT or project specified | |
| Construction | Forged | |
| Head Type | Square Head | |
| Surface Finish | Standard or customer specified | |
| Heat Treatment | As required by material specification | |
| Marking | Size, class, material, heat number and required identification | |
| Documentation | MTC, COC and project-required quality records | |
| Note: Pressure classes are stated according to the applicable ASME B16.11 threaded fitting configuration. Special pressure classes or non-standard designs can be supplied where specifically engineered and agreed for the project. | ||
| Custom Requirement | Details |
|---|---|
| Nominal Size | NPS / DN or project specific |
| Pressure Class | 2000 / 3000 / 6000 or project specified |
| Plug Type | Square Head Plug / Custom |
| Material | Required material grade |
| Connection | Male Threaded / Screwed |
| Thread Type | NPT / Project specified |
| Head Size | Standard / Custom |
| Overall Length | Standard / Custom |
| Heat Treatment | As required |
| NDE | Project specified |
| Quality Requirements | ITP / Third-party requirements |
| Marking | Customer requirements |
| Documentation | MTC / COC / Quality reports |
| Test / Examination | Availability |
|---|---|
| Chemical Analysis | Material dependent |
| Tensile & Yield Testing | Material dependent |
| Impact Testing | Where required |
| Hardness Testing | As specified |
| Positive Material Identification (PMI) | As specified |
| Ultrasonic Testing (UT) | As specified |
| Magnetic Particle Testing (MT) | As specified |
| Liquid Penetrant Testing (PT) | As specified |
| Radiographic Testing (RT) | As specified |
| Intergranular Corrosion Testing | Where applicable |
| Pitting / Corrosion Testing | Where applicable |
| Macro / Micro Examination | Where specified |
| Additional Project-Specified Tests | Available |
| Third-Party Verification | Available |
| Document | Availability |
|---|---|
| Material Test Certificate (MTC) | Available |
| EN 10204 3.1 | Available |
| EN 10204 3.2 | Where specified |
| Certificate of Conformance (COC) | Available |
| Dimensional Report | Available |
| Chemical Analysis Report | Material dependent |
| Mechanical Test Report | Material dependent |
| Heat Treatment Records | Where applicable |
| PMI Report | As specified |
| NDE Reports | As specified |
| Quality Assurance Plan (QAP) | Project specific |
| Inspection & Test Plan (ITP) | Project specific |
| Certificate of Origin | Available |
| Packing List | Available |
| Commercial Invoice | Available |
| Fumigation Certificate | Where applicable |
| Material Traceability Records | Maintained |
| Third-Party Inspection Certificate | Available |
Note: ASME B16.11 establishes dimensional and pressure-temperature requirements for forged threaded and socket-weld fittings. Thread requirements are governed by the applicable thread standard, while material requirements are governed by the applicable ASTM/ASME material specification.
Stainless Steel
ASTM/ASME A182 F304/F304L, F316/F316L, F304H, F316H, F316Ti, F317/F317L, F321/F321H, F347/F347H and F904L, with other stainless grades available to project requirements.
Duplex & Super Duplex
ASTM/ASME A182 F51, F53 and F55, including UNS S31803, S32205, S32550, S32750, S32760 and S32950.
Carbon Steel
ASTM/ASME A105/A105N and A350 LF2/LF3, with other project-specified carbon steel grades available where applicable.
Alloy Steel
ASTM/ASME A182 F1, F5, F9, F11, F12, F22, F23, F91 and F92, with other alloy grades available according to project requirements.
Copper-Nickel Alloys
ASTM/ASME SB111 and SB466, including UNS C70600 (90/10 Cu-Ni) and C71500 (70/30 Cu-Ni).
Nickel Alloys
Nickel 200/201, Monel 400/K500, Alloy 20, Inconel 600/601/625/825 and Hastelloy C276, including applicable ASTM/ASME specifications.
Titanium & Special Alloys
Titanium and other specialty alloys can be supplied according to customer specifications, process conditions and project requirements.
Material selection is based on operating pressure, temperature, process fluid, corrosion conditions, mechanical requirements and applicable project specifications.
Standard Threaded Square Plug
A forged plug with a male threaded connection and square head, designed to close a threaded opening in a pipe, fitting, valve or equipment connection.
Square Head Threaded Plug
The square head provides a convenient tool-engagement surface for tightening and removal during installation or maintenance.
High-Pressure Threaded Square Plug
Forged construction suitable for high-pressure piping applications and available in applicable pressure classes according to material, design and project requirements.
Custom Threaded Square Plug
Special thread sizes, head dimensions, overall lengths, materials, finishes, markings and other requirements can be supplied according to customer drawings and project specifications.
Elite’s manufacturing process can include:
Forged Threaded / Screwed Square Plugs are commonly used in:
For quotation, provide:
Size + Pressure Class + Plug Type + Material + Thread Type + Head Size + Quantity + Quality Requirements
Example
2″ Class 6000 Threaded Square Plug, ASTM A182 F316L, Forged Construction, NPT Male Thread, Square Head, Project-Specified Dimensions, EN 10204 3.1.
