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About OPK Fitting

OPK FITTING Hydraulic Equipment Factory is China Custom Hydraulic Lines and Flexible Hydraulic Hoses Factory. We are a professional domestic factory with extensive experience in the production of hydraulic pipes and fittings. Our managing scope relates to various fields such as hydraulic systems etc.; Including all kinds of materials with different pressure levels, flexible hydraulic hoses with various size criteria, hose fitting, adaptor, etc. They have been respectively applied in the hydraulic and fluid conveyance systems of industries, such as machinery, metallurgy petroleum, construction, ships, space-flight, agriculture, pharmaceutical, food, and so forth.
We provide ODM/OEM customization services for a wide range of high-pressure hydraulic fittings and hydraulic oil pipe fittings.
Over 10 years of experience.
A team of skilled design professionals and talent.
Excellent product quality and thoughtful customer service.

Our 10 years of customisation experience has created the OPK Fitting brand value.

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News

  • JIC Hydraulic Fittings: Sizes, Threads, vs NPT/ORFS, Selection and Installation
    Industry News 2026-09-03

    여러분의 손은 이미 그 차이를 알고 있습니다. JIC 수형 피팅은 JIC 암형 스위블과 금속 간 37° 플레어가 있는 시트에 부드럽게 나사산이 끼워져 있습니다. 동일한 수컷을 NPT 포트에 연결하면 나사산이 묶이거나 누출되거나 손상됩니다. 이 짧은 테스트는 JIC 유압 피팅이 인기 있고 오해받는 이유를 포착합니다. JIC는 공동 산업 협의회(Joint Industry Council)를 의미하며 형상은 SAE J514에 정의되어 있습니다. 평행 UNF 나사산과 37° 플레어 밀봉 표면. 유압 호스를 주문하거나 조립할 때 나...

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  • Hydraulic Fitting Threads: Identification Guide for NPT, JIC, ORFS, BSP, and Metric
    Industry News 2026-08-26

    새로 배달된 호스 조립품이 펌프 포트에 3번 회전한 후 결합된다고 가정해 보십시오. 조금 더 힘을 가하면 연결이 제대로 보이지만 시스템이 작동 압력에 도달하자마자 누출이 발생합니다. 현장 서비스에서 일치하지 않는 유압 피팅 스레드는 결함이 있는 호스보다 훨씬 더 자주 누출, 포트 벗겨짐 및 생산 시간 손실을 유발합니다. 스레드 계열과 이를 식별하는 방법을 이해하면 이러한 문제가 시작되기 전에 대부분의 문제를 해결할 수 있습니다. 유압 피팅 스레드가 중요한 이유 유압 피팅의 나사산은 부품을 함께 고...

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  • How to Identify Hydraulic Fittings: Thread Types, Standards & Sizing Guide
    Industry News 2026-08-20

    A hydraulic hose bursts on an excavator arm at mid-morning. The spare fitting in the toolbox looks exactly like the damaged one, but it will not thread on. Identifying hydraulic fittings correctly is what separates a 20-minute repair from a half-day hunt for the right adapter. Most hydra...

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Product

1、How Do Hydraulic Lines and Fittings Work in Industrial Systems?

Hydraulic lines and fittings are essential components in fluid power systems, responsible for transporting pressurized fluid between different parts of machinery. These systems are widely used in construction equipment, manufacturing lines, and automotive applications. A typical hydraulic system can operate at pressures ranging from 1,500 to 5,000 PSI , making reliability and sealing performance critical.

Hydraulic lines (hoses or tubes) carry the fluid, while fittings connect these lines securely to pumps, valves, and actuators. Proper design ensures minimal leakage, efficient energy transfer, and long service life.

2、What Are the Main Types of Hydraulic Lines and Fittings?

（1）Hydraulic Lines

  • Flexible Hoses – Ideal for dynamic systems with movement
  • Rigid Tubes – Used in high-pressure, stable environments
  • Thermoplastic Hoses – Lightweight and corrosion-resistant

（2）Hydraulic Fittings

  • Threaded Fittings (NPT, BSP)
  • Flanged Fittings for high-pressure applications
  • Quick Couplers for fast connection/disconnection

Each type serves different pressure ratings and operational requirements, ensuring optimal system performance.

3、How to Select the Right Hydraulic Lines and Fittings?

（1）Key Selection Factors

  • Pressure Rating – Must exceed system pressure by at least 25%
  • Temperature Resistance – Typically from -40°C to 120°C
  • Material Compatibility – Prevents corrosion and degradation
  • Flexibility and Installation Space

（2）Comparison Table

Comparison of Hydraulic Line Types and Their Applications
Type Pressure Capacity Best Use
Flexible Hose Up to 5,000 PSI Mobile equipment
Rigid Tube Up to 10,000 PSI Industrial systems

4、How to Maintain Hydraulic Lines and Fittings for Long-Term Use?

（1）Routine Inspection

Inspect hoses for cracks, leaks, or bulging. Studies show that over 70% of hydraulic failures are caused by poor maintenance.

（2）Proper Installation

Avoid over-tightening fittings and ensure correct alignment to reduce stress and extend lifespan.

（3）Company Introduction

Ningbo Force Auto Parts Co., Ltd. specializes in providing high-quality hydraulic components, lifting solutions, and industrial accessories. With advanced manufacturing capabilities and strict quality control, the company delivers reliable products that meet global standards, helping customers improve system efficiency and safety.

5、Frequently Asked Questions (FAQs)

Q1: How often should hydraulic lines be replaced?

Typically every 3–5 years , depending on usage and environmental conditions.

Q2: How do I prevent hydraulic leaks?

Use correct fittings, ensure proper torque, and regularly inspect seals and connections.

Q3: How do I choose between hose and tube?

Choose hoses for flexibility and vibration resistance, and tubes for high-pressure, fixed installations.