UNION F/F(CU FF)

Product Overview

The Stainless Steel Union F/F (CU FF) is a precision-engineered female-to-female threaded pipe union, designed for fast, detachable connections in fluid piping systems.

This union enables easy assembly, disassembly, and maintenance without rotating the pipes, making it a critical component for industrial, commercial, and residential pipelines.

Manufactured via advanced lost wax casting, it delivers exceptional dimensional accuracy, corrosion resistance, and reliable sealing performance for long-term, leak-free operation.

Key Features

Female-to-Female (F/F) Detachable Union Design
Designed for convenient connection and disconnection between two female-threaded pipes. Simplifies maintenance, repair, and system modification without disturbing the entire network. The dual female thread configuration allows direct connection to male-threaded pipes and components.

Premium Material Selection
Available in stainless steel, carbon steel, alloy steel, tool steel, and custom alloys. Suitable for high-pressure, high-temperature, and corrosive environments.

Precision Lost Wax Casting Process
Ensures smooth internal surfaces, tight dimensional tolerances, and uniform mechanical properties, minimizing flow resistance and guaranteeing consistent quality.

Global Standard Compliance
Complies with ASTM, JIS, DIN, BS NF, ISO4144, SP-114, and K-version standards.
Complete size range from 1/8" to 4" to meet diverse global project requirements.

Reliable Sealing Performance
Precision mating surfaces and a heavy-duty hex nut structure provide a tight, leak-proof seal under varying pressure and temperature conditions.

Customizable Surface Treatment
Supports passivation, polishing, coating, and other treatments to enhance corrosion resistance, aesthetics, and service life.

Technical Specifications

• Product Type: Union F/F (CU FF)

• 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: Female × Female (F/F) Internal Threaded

• Manufacturing Process: Lost Wax Casting

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

• Weight Range: 5g – 50kg (depending on 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 (cartons, plywood pallets, with custom options available)

• Inspection: Rigorous in-house inspection; third-party inspection available on 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 applications requiring frequent maintenance, system modification, or temporary pipeline connections.

Main Export Markets

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

Customization Support

We offer full customization for:

• Special materials

• Non-standard sizes

• Custom connection types

• Surface treatments

Our technical team provides detailed consultation and tailored solutions to meet your unique project requirements.