Different connection methods for hydraulic fittings

Jan 07, 2026

Identifying hydraulic fittings is extremely important. It not only affects the safety and reliability of the system, but also ensures that the fittings match the pipe standards, pressure ratings, and sealing methods, thereby preventing leaks, burst pipes, and other accidents. Additionally, correctly identifying fittings helps improve system performance, facilitates maintenance and replacement, and reduces equipment damage and repair costs. It is a fundamental skill for the design, installation, and operation of hydraulic systems. Today, we will focus on understanding several different connection methods of hydraulic fittings.

Why It Is Important to Understand The Connection Methods of Hydraulic Fittings

In hydraulic systems, the type of connection used for fittings plays a critical role in ensuring safety, reliability, and efficiency. Different hydraulic fittings employ various connection methods, each with its own advantages, pressure limits, and application scenarios. Understanding these connection types is essential for selecting the right fitting, preventing leaks, and maintaining optimal system performance.

Threaded Connections

Straight threads

Characteristics and typical applications
Sealing methods: O-ring, gasket, thread sealant

Tapered threads (NPT, BSPT)

Self-sealing properties
Advantages and limitations

Flare Connections

37° JIC flare

Features, pressure ratings, and applications

45° SAE flare

Typical use cases and advantages

Advantages: strong metal-to-metal seal, reusability

Bite-Type Connections

DIN / ORFS / Metric compression fittings
How the fitting bites into the hose or tube for a tight seal
Pros: good vibration resistance, moderate pressure ratings

O-Ring Face Seal Connections

Design and sealing principle
Advantages: leak-free under high pressure, easy assembly/disassembly
Typical applications in high-pressure hydraulic systems

Push-to-Connect Fittings

Features and benefits: fast assembly, minimal tools required
Limitations: usually lower pressure ratings
Common applications: mobile equipment, low/medium pressure circuits

Welded and Brazed Connections

Permanent connections for steel or stainless steel tubing
High-pressure capability and leak-proof performance
Pros and cons: permanent, high integrity, requires skilled labor

Adhesive / Bonded Connections

Used in PTFE, nylon, or plastic hoses
Sealing via chemical bonding or fusion
Applications: chemical compatibility, lightweight systems

Different connection methods for hydraulic fittings

Comparison of Connection Methods

Connection Type	Key Features	Sealing Method / Principle	Advantages
Threaded (Straight / Tapered)	Straight threads, NPT/BSPT tapered	O-ring, gasket, thread sealant, self-sealing	Reliable, widely used, moderate pressure
Flare (37° JIC / 45° SAE)	Metal-to-metal angled seal	Flared metal contact	Strong seal, reusable, high pressure
Bite-Type (Compression / DIN / ORFS / Metric)	Fitting bites into hose/tube	Mechanical compression	Vibration resistant, moderate pressure
O-Ring Face Seal (ORFS)	Face seal design	O-ring between fitting face and port	Leak-free under high pressure, easy assembly/disassembly
Push-to-Connect / Quick-Release	Fast assembly, minimal tools	Push-fit sealing	Quick installation, reusable
Welded / Brazed	Permanent metal connection	Fusion / welding	High-pressure capability, leak-proof, strong integrity
Adhesive / Bonded	Chemical bonding or fusion	Adhesive/sealing compound	Lightweight, chemical resistant

Fokca Manufacturer Introduce

Identifying the different connection methods of hydraulic fittings is crucial for the safety, reliability, and performance of hydraulic systems. Various fittings use connection methods such as threaded, flanged, quick-connect, and welded, each differing in pressure capacity, sealing performance, ease of installation, and suitable applications. Correctly identifying the type and connection method of a fitting ensures proper interface matching, prevents leaks and burst pipes, optimizes system efficiency, reduces maintenance costs, and extends equipment lifespan. We specialize in manufacturing a wide range of fittings, including hydraulic fittings, pneumatic fittings, and pipe fittings, using precise manufacturing processes and offering better cost-performance compared to industry peers. If your industry has such needs, please contact us promptly

(Fk9016)

Blog