SQUARE PLUG(SQ)

Product Overview

The Square Plug (SQ) is a precision-engineered male threaded pipe plug with a square head, designed to securely seal and close off unused female-threaded pipe ends in fluid piping systems.

This durable fitting creates a reliable, leak-proof barrier, making it an essential component for industrial, commercial, and residential piping networks.

Manufactured via advanced lost wax casting, the SQ provides exceptional dimensional accuracy, corrosion resistance, and mechanical strength for long-term, dependable operation across diverse fluid transfer applications.

Key Features

Square Head Design
The integrated square head provides a secure, tool-friendly grip for easy installation and tightening, ensuring a consistent, leak-proof seal without damaging the fitting body, even in tight or hard-to-reach spaces.

Full Male Thread Configuration
Features a full external male thread for a secure, direct fit into any standard female-threaded pipe end, creating a permanent or temporary seal for pipeline termination, test ports, or future expansion points.

Premium Material Selection
Available in stainless steel, carbon steel, alloy steel, tool steel, and custom alloys, designed to withstand high pressure, high temperature, and corrosive working environments.

Precision Lost Wax Casting Process
Ensures smooth surfaces, tight dimensional tolerances, and uniform mechanical properties, delivering consistent sealing performance and long-lasting product quality.

Global Standard Compliance
Compliant with ASTM, JIS, DIN, BS NF, ISO4144, SP-114, and K-version standards, covering a full size range from 1/8" to 4", suitable for global pipeline applications.

Customizable Surface Treatment
Surface finishing can be fully customized, including passivation, polishing, coating, and more, enhancing corrosion resistance, aesthetics, and service life.

Technical Specifications

• Product Type: Square Plug (SQ)

• Size Range: 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4"

• Connection Type: Male External Threaded

• Manufacturing Process: Lost wax casting

• Applicable Standards: ASTM, JIS, DIN, BS NF, ISO4144, SP-114, K-version

• Weight Range: 5g – 50kg (varies by size and material)

• Maximum Size Limit: 500 × 500 × 500 mm

• Monthly Production Capacity: 100 Metric Tons

Supply & Trade Terms

• Minimum Order Quantity (MOQ): 50 pieces

• Quotation Terms: EXW, FOB, CFR, CIF

• Payment Terms: T/T, L/C

• Place of Origin: Hebei, China

• Loading Port: Tianjin Port or other designated Chinese ports

• Lead Time: 30–60 days after order confirmation

Packaging & Inspection

• Packaging: Standard export packaging including cartons, plywood pallets, and custom solutions

• Inspection: Rigorous in-house self-inspection; third-party inspection available upon request

• Supporting Documents:

• Material chemical composition report

• Dimensional measurement report

• Hardness test report

• Other required quality certificates

Application Scenarios

Widely used in:

• Water supply and drainage

• HVAC systems

• Fire protection

• Petroleum and chemical industries

• Food processing and pharmaceutical industries

• General industrial piping systems

Ideal for:

• Terminating unused pipe branches

• Closing test ports

• Blocking pipeline ends for maintenance or future expansion

Main Export Markets

Europe, United States, Canada, Australia, Japan, South Korea, and other global markets.