Slip-On Flange for Easy Installation and Reliable Pipe Connections

A slip-on flange, also known as an SO flange, is a widely used pipe flange designed to slide over the outside diameter of a pipe before being welded in position. Compared with weld neck flanges, slip-on flanges offer easier installation, lower fabrication costs, and excellent performance for low to medium-pressure piping systems.

DTC manufactures and supplies carbon steel slip-on flanges, stainless steel slip-on flanges, and alloy steel slip-on flanges according to international standards including ASME B16.5, EN 1092-1, and JIS B2220.

With strong supply chain integration and OEM customization capability, DTC provides reliable flange solutions for distributors, contractors, and industrial projects worldwide.

Key Features of Slip-On Flange

Easy Installation

The flange slides over the pipe and is welded both internally and externally, making alignment easier during installation.

Cost-Effective Solution

Compared with weld neck flanges, slip-on flanges require less machining and welding preparation, reducing overall fabrication costs.

Wide Application Range

Suitable for general industrial piping systems where extreme pressure, temperature, or cyclic loading is not required.

Custom Manufacturing Capability

Available in different materials, dimensions, pressure classes, and facing types according to customer requirements.

Technical Specifications

Common Materials

Carbon Steel Slip-On Flange

Common grades:

• ASTM A105
• ASTM A350 LF2
• Q235B / Q355

Applications:

• Water pipelines
• Fire protection systems
• General industrial piping

Stainless Steel Slip-On Flange

Common grades:

• ASTM A182 F304
• ASTM A182 F316
• 304L / 316L

Applications:

• Chemical processing
• Food & beverage
• Pharmaceutical
• Corrosive environments

Slip-On Flange Applications

Slip-on flanges are commonly used in:

• Fire Protection Systems
• Water Treatment Plants
• HVAC Systems
• Oil & Gas Pipelines
• Petrochemical Industry
• Chemical Processing
• Marine Engineering
• General Industrial Piping

Slip-On Flange vs Weld Neck Flange

Why Choose DTC Slip-On Flanges?

Factory Direct Supply

DTC provides direct sourcing from reliable manufacturers, helping customers achieve competitive pricing and stable quality.

Complete Material Options

Carbon steel, stainless steel, and alloy steel solutions are available for different industrial environments.

OEM & Customized Service

Customized dimensions, markings, drilling patterns, coatings, and private labels are supported.

Quality Assurance

Products can be supplied with:

• EN10204 3.1 Material Test Certificate
• Dimensional Inspection Report
• Chemical Composition Report
• Mechanical Property Test Report

Frequently Asked Questions (FAQ)

What is a slip-on flange?

A slip-on flange is a type of flange that slides over the pipe and is welded internally and externally to create a connection.

What is the difference between slip-on flange and weld neck flange?

Slip-on flanges are easier and cheaper to install, while weld neck flanges provide better strength and fatigue resistance for high-pressure applications.

Can slip-on flanges be used for fire protection systems?

Yes. Carbon steel slip-on flanges are widely used in fire sprinkler and hydrant pipeline systems.

What standards do DTC slip-on flanges follow?

DTC supplies slip-on flanges according to ASME B16.5, EN 1092-1, JIS B2220, and customer-specific requirements.

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